tag:blogger.com,1999:blog-75856461252827858212024-03-13T12:02:15.374-07:00Electronics TechnologyPin Configurations, Pin outs, circuits, schematics and application notes of electronic devicespinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.comBlogger323125tag:blogger.com,1999:blog-7585646125282785821.post-70863702443598814962012-02-13T13:03:00.001-08:002012-02-13T13:03:35.173-08:00Stepper motor drive<div dir="ltr" style="text-align: left;" trbidi="on">
<table border="0" cellspacing="0" style="width: 800px;"><tbody>
<tr><td colspan="3" height="95"><div class="Titre-paragraphe">
<b><span style="font-size: large;">Stepper motor drive</span></b></div>
<div class="texte-normal">
Integrated circuits intended to drive stepper motors
are many and are rather easy to operate because they contain
both logical circuits and power circuits
in the same chip. You just have to choose the circuit corresponding
to the type of stepper motor you want to use,
namely unipolar (6 wires) or bipolar (4 wires).<br />
In the first case, we can use a SAA on 1027 (difficult to find
now) or a more powerful UCN 5804. For the bipolar motor, the SAA 1042
(idem) or the MC 3479 will be quite indicated. Most of these controllers
allow to work in half-step mode.</div>
<div class="texte-normal">
It is to note also that we can drive a unipolar motor with a controleur for bipolar motor but that the opposite is not possible.</div>
<div class="texte-normal">
We propose here a plan of driver for
unipolar motor realized with 2 common logic components and a power
circuit. It is possible to drive motor needing 500 mA by coil, what
should be sufficient in the present frame!</div>
</td>
</tr>
<tr>
<td>
<div class="texte-colonne">
Pin Assignments for CD4070 </div>
<ol class="texte-colonne">
<li>In 1</li>
<li>In 1'</li>
<li>Out 1</li>
<li>Out 2</li>
<li>In 2</li>
<li>In 2'</li>
<li>Ground</li>
<li>In 3</li>
<li>In 3'</li>
<li>Out 3</li>
<li>Out 4</li>
<li>In 4</li>
<li>In 4'</li>
<li>+Vcc</li>
</ol>
<div class="texte-colonne">
Pin Assignments for CD4013 </div>
<ol class="texte-colonne">
<li>Out 1</li>
<li>Out inv 1</li>
<li>Clock 1</li>
<li>Reset 1</li>
<li>Data 1</li>
<li>Set 1</li>
<li>Ground</li>
<li>Set 2</li>
<li>Data 2</li>
<li>Reset 2</li>
<li>Clock 2</li>
<li>Out inv 2</li>
<li>Out 2</li>
<li>+Vcc</li>
</ol>
</td>
<td>
<div align="center">
<img height="497" src="http://www.astrosurf.com/spectrohelio/images/stepper.gif" width="420" /></div>
</td>
<td>
<div class="texte-colonne">
Pin Assignments for CD4093 </div>
<ol class="texte-colonne">
<li>In 1</li>
<li>In 2</li>
<li>In 3</li>
<li>In 4</li>
<li>In 5</li>
<li>In 6</li>
<li>In 7</li>
<li>Ground</li>
<li>+Vcc</li>
<li>Out 7</li>
<li>Out 6</li>
<li>Out 5</li>
<li>Out 4</li>
<li>Out 3</li>
<li>Out 2</li>
<li>Out 1</li>
</ol>
<br />
<br />
<div class="texte-colonne">
Components list</div>
<div class="texte-colonne">
IC : <br />
quad. XOR = CD 4070 or 4030<br />
Dual shift register = CD 4013<br />
Ampli = ULN 2003<br />
Unipolar stepper motor </div>
<br />
</td>
</tr>
<tr>
<td colspan="3">
<div class="texte-normal">
Stepper motors can be found on old floppy
disk drives or printers for example. In certain cases we can even use
the controllers who are joined to it. 2 control pulses can result from a
microcomputer (parallel port) + line buffers.
</div>
</td></tr>
</tbody></table>
</div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com1tag:blogger.com,1999:blog-7585646125282785821.post-16794475058788886132012-02-13T13:02:00.002-08:002012-02-13T13:02:54.923-08:00Analogic / Digital converter<div dir="ltr" style="text-align: left;" trbidi="on">
<table border="0" cellspacing="0" style="width: 800px;"><tbody>
<tr><td colspan="3"><div class="Titre-paragraphe">
<b><span style="font-size: large;">Analogic / Digital converter</span></b></div>
<div class="texte-normal">
This integrated circuit (AD
7821) allows to convert an analogic signal in a 8 bits value with a 1 µs
conversion time, thus with a 1 MHz frequency. There are faster
converters allowing to obtain a better resolution (10, 12, 14 or 16
bits). <br />
<br />
</div>
</td>
</tr>
<tr>
<td>
<div class="texte-colonne">
Pin Assignments for AD7821 </div>
<ol class="texte-colonne">
<li>Input</li>
<li>Data bit 3 </li>
<li>Data bit 2 </li>
<li>Data bit 1 </li>
<li>Data bit 0 </li>
<li>WR/RDY</li>
<li>Mode</li>
<li>RD</li>
<li>INT</li>
<li>Ground</li>
<li>Vref -</li>
<li>Vref +</li>
<li>CS</li>
<li>Data bit 4 </li>
<li>Data bit 5</li>
<li>Data bit 6</li>
<li>Data bit 7</li>
<li>OFL</li>
<li>Vss</li>
<li>+Vcc</li>
</ol>
</td>
<td>
<div align="center">
<img height="309" src="http://www.astrosurf.com/spectrohelio/images/conv-AD.gif" width="425" /><br />
<br />
</div>
</td>
<td> <div class="texte-colonne">
Components List</div>
<div class="texte-colonne">
Pot. : P1 = 20 kΩ<br />
A/D Converter = AD7821<br />
trigger inverter = 1/4 CD4093</div>
</td>
</tr>
<tr>
<td colspan="3">
<div class="texte-normal">
The signal resulting from the amplifier is
applied to the pin 1 (Input). The reference voltage is adjusted by
means of P1. It is very summary but that works. We can also use a
specific component to obtain this reference voltage (zener diode for
ex.). </div>
<div class="texte-normal">
The pulse "start of conversion" results
from the clock generator (having a 5 V level compatible with the
converter) and the pulse "End of conversion" is sent to the PC
interface, as well as 8 bits data. We can also send these data through
buffer circuits (74245 by eg) to secure the exchanges
interface-converter. The logic gate (1/4 CD4093) can be another
inverter. </div>
</td></tr>
</tbody></table>
</div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com1tag:blogger.com,1999:blog-7585646125282785821.post-89816827039070483152012-02-13T13:02:00.000-08:002012-02-13T13:02:37.540-08:00Changing the pulse width<div dir="ltr" style="text-align: left;" trbidi="on">
<table border="0" cellspacing="0" style="width: 800px;"><tbody>
<tr><td colspan="3"><div class="Titre-paragraphe">
<b><span style="font-size: large;">Changing the pulse width</span></b></div>
<div class="texte-normal">
The previous assembly gives a rectangular
signal with a duty cyclic equal to 50
%. We can need to change it
to produce pulses for example. A simple means is to use
a variable RC circuit and to reshape the signal obtained
by means of a Schmidt trigger , here a CD 4093 which
allows to use a wide range of voltage. (The CD 4093 is in
fact a quadruple logic gates NAND which we use here only
the inverter function).
<br />
</div>
</td>
</tr>
<tr>
<td>
<div class="texte-colonne">
Pin Assignments for CD4093</div>
<ol class="texte-colonne">
<li>In1</li>
<li>In1'</li>
<li>Out1</li>
<li>Out2</li>
<li>In2</li>
<li>In2'</li>
<li>Ground</li>
<li>In3</li>
<li>In3'</li>
<li>Out3</li>
<li>1Out4</li>
<li>In4</li>
<li>In4'</li>
<li>+Vcc</li>
</ol>
</td>
<td><img height="269" src="http://www.astrosurf.com/spectrohelio/images/pulse.gif" width="420" /><br />
<br /> </td>
<td>
<div class="texte-colonne">
Components List</div>
<div class="texte-colonne">
Pot. : P1
= 20 kΩ<br />
Capacitors : C1, 33 pF<br />
digital circuit : CD 4093</div>
<div class="texte-colonne">
Power supply VCC : 5 to 18 V</div>
</td>
</tr>
<tr>
<td colspan="3">
<div class="texte-normal">
Modifying the value of P1 we make vary the height
of the signal (B) which is not any more squarewave but sawtooth.
The trigger activates when a threshold is reached
and we so obtain a modified duty cycle (C and D).</div>
</td></tr>
</tbody></table>
</div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-25119625383887042712012-02-13T13:01:00.001-08:002012-02-13T13:01:14.054-08:00Clock pulse generator / binary counter<div dir="ltr" style="text-align: left;" trbidi="on">
<table border="0" cellspacing="0" style="width: 800px;"><tbody>
<tr><td colspan="3"><div class="Titre-paragraphe">
<b><span style="font-size: large;">Clock pulse generator / binary counter</span></b></div>
<div class="texte-normal">
This digital circuit (CD
4060) allows to produce a stable square signal of high frequency by
means of a quartz and very few secondary components. Its counter
function (divide by 2 counter) allows to find one frequencies suited for
the clocks of the CCD.<br />
<br />
</div>
</td>
</tr>
<tr>
<td>
<div class="texte-colonne">
Pin Assignments for CD4060</div>
<ol class="texte-colonne">
<li>Q12</li>
<li>Q13</li>
<li>Q14</li>
<li>Q6</li>
<li>Q5</li>
<li>Q7</li>
<li>Q4</li>
<li>Ground</li>
<li>clk2</li>
<li>clk 1</li>
<li>clk</li>
<li>reset</li>
<li>Q9</li>
<li>Q8</li>
<li>Q10</li>
<li>+Vcc</li>
</ol>
</td>
<td>
<div align="center">
<img border="0" height="259" src="http://www.astrosurf.com/spectrohelio/images/oscillateur.gif" width="240" /><br />
<br />
</div>
</td>
<td>
<div class="texte-colonne">
Components List</div>
<div class="texte-colonne">
Resistor : R1 = 10 MΩ<br />
Capacitors : C1, C2 = 4.7 pF<br />
Quartz : X1 = 12 MHz<br />
digital circuit : CD 4060</div>
<div class="texte-colonne">
Power supply VCC : 5 to 18 V</div>
</td>
</tr>
<tr>
<td colspan="3">
<div class="texte-normal">
Output Qi delivers a frequency equal to the quartz frequency divided by 2 at the power i (ex: Q5 gives Freq / 32)</div>
</td></tr>
</tbody></table>
</div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-75211067261831799862012-02-13T12:59:00.000-08:002012-02-13T12:59:10.675-08:00Stepper Motor<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
Stepper Motor Data
</h3>
<br />
<span style="color: #3333ff; font-family: arial;"><strong>program shows the basic operation of the stepper motors</strong></span><br /><span style="font-family: arial;"></span><br /><a href="http://4.bp.blogspot.com/_ycHwJEosotY/SXE9mk46WMI/AAAAAAAAAKw/kDIHM0GLR6Q/s1600-h/stepmotor01.gif"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5292078770083748034" src="http://4.bp.blogspot.com/_ycHwJEosotY/SXE9mk46WMI/AAAAAAAAAKw/kDIHM0GLR6Q/s200/stepmotor01.gif" style="cursor: hand; display: block; height: 124px; margin: 0px auto 10px; text-align: center; width: 200px;" /></span></a><span style="font-family: arial;"> </span><span style="font-family: arial;">This program shows the basic operation of the unipolar and<br />bipolar stepper motors. In addition there are demos of a translator<br />, oscillator and indexer.</span><a href="http://www.wimb.net/index.php?s=delphi&page=6"><span style="color: #33cc00; font-family: arial;">http://www.wimb.net/index.php?s=delphi&page=6</span></a><span style="font-family: arial;"><br /><br /><strong><span style="color: #3333ff;">Basic theory of Stepping Motors</span></strong><br />Stepping motors are electromagnetic, rotary, incremental devices<br />which convert digital pulses into mechanical rotation. The amount<br />of rotation is directly proportional to the number of pulses and the<br />speed of rotation is relative to the frequency of those pulses.</span><br /><span style="font-family: Arial;"></span><br /><a href="http://4.bp.blogspot.com/_ycHwJEosotY/SXE9TxH18_I/AAAAAAAAAKo/m-lp1Lr7l6s/s1600-h/step+motor+wave.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5292078446950085618" src="http://4.bp.blogspot.com/_ycHwJEosotY/SXE9TxH18_I/AAAAAAAAAKo/m-lp1Lr7l6s/s200/step+motor+wave.JPG" style="cursor: hand; display: block; height: 128px; margin: 0px auto 10px; text-align: center; width: 200px;" /></span></a><span style="font-family: arial;"> </span><span style="font-family: arial;">Static or holding torque - displacement characteristic<br />The characteristic of static (holding) torque - displacement is best<br />explained using an electro-magnet and a single pole rotor . In<br />the example the electro-magnet represents the motor stator and is<br />energized with it's north pole facing the rotor</span><a href="http://www.sapiensman.com/step_motor/"><span style="color: #33cc00; font-family: arial;">http://www.sapiensman.com/step_motor/</span></a><span style="font-family: arial;"><br /><br /><strong><span style="color: #3333ff;">Stepper Motors: Principles of Operation</span></strong></span><br /><br /><a href="http://2.bp.blogspot.com/_ycHwJEosotY/SXE9IVphVZI/AAAAAAAAAKg/FriPEJioBEs/s1600-h/step-motor1001.gif"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5292078250596586898" src="http://2.bp.blogspot.com/_ycHwJEosotY/SXE9IVphVZI/AAAAAAAAAKg/FriPEJioBEs/s200/step-motor1001.gif" style="cursor: hand; display: block; height: 166px; margin: 0px auto 10px; text-align: center; width: 200px;" /></span></a><span style="font-family: arial;"><br /></span><span style="font-family: arial;">Permanent Magnet stepper motors incorporate a permanent magnet<br />rotor, coil windings and magnetically conductive stators. Energizing<br />a coil winding creates an electromagnetic field with a north and south<br />pole .</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-41746049635205859022012-02-13T12:58:00.000-08:002012-02-13T12:58:05.583-08:00Switch-Mode Battery Charger Circuit<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
Switch-Mode Battery Charger Circuit
</h3>
<br />
<span style="font-family: arial;"><br /><strong><span style="color: #3333ff;">Fast, High Effi ciency, Standalone NiMH/NiCd Battery<br />Charging Circuit</span></strong></span><br /><a href="http://1.bp.blogspot.com/_ycHwJEosotY/SdlRJTx00UI/AAAAAAAAApk/RlBOvnA3utw/s1600-h/Design+Battery+Charger+Circuit+03.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5321373655084880194" src="http://1.bp.blogspot.com/_ycHwJEosotY/SdlRJTx00UI/AAAAAAAAApk/RlBOvnA3utw/s200/Design+Battery+Charger+Circuit+03.JPG" style="cursor: hand; display: block; height: 109px; margin: 0px auto 10px; text-align: center; width: 200px;" /></span></a><span style="font-family: arial;"><br /></span><div>
<span style="font-family: arial;">Figure 1 shows a fast, 2A charger featuring the<br />high effi ciency LTC4011 550kHz synchronous buck<br />converter. The LTC4011 simplifi es charger design by<br />integrating all of the features needed to charge Ni-based<br />batteries, including constant current control circuitry,<br />charge termination, automatic trickle and top off<br />charge, automatic recharge, programmable timer,<br />PowerPath control and multiple status outputs. Such a<br />high level of integration lowers the component count,<br />enabling a complete charger to occupy less than 4cm2<br />of board area. </span></div>
<div>
<span style="font-family: arial;"><span style="color: #33cc00;"></span></span><span style="font-family: arial;"><br /><br /><strong><span style="color: #3333ff;">Battery Charger Delivers 2.5A With >96% Efficiency</span></strong>Battery chargers are usually designed without regard for<br />efficiency, but the heat generated by low-efficiency<br />chargers can present a problem. For those applications,<br />the charger of Figure 1 delivers 2.5A with efficiency as<br />high as 96%. It can charge a battery of one to six cells<br />while operating from a car battery.</span></div>
<br /><a href="http://4.bp.blogspot.com/_ycHwJEosotY/SdlRDTtrqUI/AAAAAAAAApc/VpVFiz5oGzM/s1600-h/Design+Battery+Charger+Circuit+04.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5321373551988287810" src="http://4.bp.blogspot.com/_ycHwJEosotY/SdlRDTtrqUI/AAAAAAAAApc/VpVFiz5oGzM/s200/Design+Battery+Charger+Circuit+04.JPG" style="cursor: hand; display: block; height: 156px; margin: 0px auto 10px; text-align: center; width: 200px;" /></span></a><span style="font-family: arial;"><br /></span><span style="font-family: arial;">Figure 1. Modified feedback paths transform this switch-mode<br />power-supply circuit for notebook computers into a<br />high-efficiency battery charger.</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-46159763805246288902012-02-13T12:57:00.001-08:002012-02-13T12:57:09.817-08:00WIDER POSITION SENSING CIRCUIT<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
WIDER POSITION SENSING CIRCUIT
</h3>
<br />
<span style="font-family: arial;"><br />To go from 45° to 90° requires two HMC1501<br />sensors or a single HMC1512 dual sensor part. By<br />using two bridges with 45° displacement from each<br />other, the two linear slopes can be used additively.<br />Figure 8 shows a typical configuration.<br />From Figure 8, as the shaft rotates around, magnetic<br />flux from a magnet placed at the end of the shaft exits<br />the north pole and returns to the south pole. With a<br />HMC1512 placed on the shaft axis, just above the<br />magnet, the flux passing through the sensor bridges<br />will retain the orientation of the magnet. From this<br />rotation, the output of the two bridges will create sine<br />and cosine waveforms as shown in Figure 9.</span><br /><a href="http://2.bp.blogspot.com/_ycHwJEosotY/Sd4vM-pO7UI/AAAAAAAAAtk/mk6XvnSGz7E/s1600-h/WIDER+POSITION+SENSING+CIRCUIT+01.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5322743709619383618" src="http://2.bp.blogspot.com/_ycHwJEosotY/Sd4vM-pO7UI/AAAAAAAAAtk/mk6XvnSGz7E/s320/WIDER+POSITION+SENSING+CIRCUIT+01.JPG" style="cursor: hand; display: block; height: 218px; margin: 0px auto 10px; text-align: center; width: 303px;" /></span></a><span style="font-family: arial;"><br /></span><a href="http://4.bp.blogspot.com/_ycHwJEosotY/Sd4vIYjSdZI/AAAAAAAAAtc/zks804cfscs/s1600-h/WIDER+POSITION+SENSING+CIRCUIT+02.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5322743630674425234" src="http://4.bp.blogspot.com/_ycHwJEosotY/Sd4vIYjSdZI/AAAAAAAAAtc/zks804cfscs/s320/WIDER+POSITION+SENSING+CIRCUIT+02.JPG" style="cursor: hand; display: block; height: 288px; margin: 0px auto 10px; text-align: center; width: 305px;" /></span></a><span style="font-family: arial;"><br /></span><div>
<span style="font-family: arial;">Because the sine (sensor bridge A) and cosine<br />(sensor bridge B) will match after the offset error<br />voltages are subtracted, the ratio of bridge A to bridge<br />B creates a tangent 2O function and the amplitude A<br />values cancel. Thus the angle theta is described<br />as:</span></div>
<a href="http://1.bp.blogspot.com/_ycHwJEosotY/Sd4vAcMLx7I/AAAAAAAAAtU/Hd3xJGOGraE/s1600-h/WIDER+POSITION+SENSING+CIRCUIT+03.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5322743494212306866" src="http://1.bp.blogspot.com/_ycHwJEosotY/Sd4vAcMLx7I/AAAAAAAAAtU/Hd3xJGOGraE/s400/WIDER+POSITION+SENSING+CIRCUIT+03.JPG" style="cursor: hand; display: block; height: 36px; margin: 0px auto 10px; text-align: center; width: 223px;" /></span></a><span style="font-family: arial;"> </span><span style="font-family: arial;">However because there are some trigonometric<br />nuances with the arctangent function when gets<br />close to _45° and beyond, these special cases apply:</span><br /><br /><a href="http://3.bp.blogspot.com/_ycHwJEosotY/Sd4u4zPLSbI/AAAAAAAAAtM/cQwJGAOvB-c/s1600-h/WIDER+POSITION+SENSING+CIRCUIT+04.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5322743362959919538" src="http://3.bp.blogspot.com/_ycHwJEosotY/Sd4u4zPLSbI/AAAAAAAAAtM/cQwJGAOvB-c/s400/WIDER+POSITION+SENSING+CIRCUIT+04.JPG" style="cursor: hand; display: block; height: 193px; margin: 0px auto 10px; text-align: center; width: 359px;" /></span></a><span style="font-family: arial;"> </span><span style="font-family: arial;">Because most trigonometric functions are performed<br />as memory maps in microcontroller integrated circuits,<br />these kinds of special case conditions are easily dealt<br />with. The resultant angle theta is the relative<br />position of the magnetic field with respect to the<br />sensor. It should be noted that if rotation is permitted<br />beyond _90°, the theta calculation will replicate again<br />with postive and negative 90° readings jumping at the<br />end points. Further performance to 360° or _180° can<br />be mapped into a microcontroller by using this circuit<br />plus a Hall Effect sensor to determine which side of<br />the shaft is being positionally measured via magnetic<br />polarity detection. Figure 10 shows the basic circuit<br />interface for the HMC1512. </span><br /><br /><a href="http://4.bp.blogspot.com/_ycHwJEosotY/Sd4uhqaNH7I/AAAAAAAAAtE/WN8IuU-aEr4/s1600-h/WIDER+POSITION+SENSING+CIRCUIT+05.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5322742965453266866" src="http://4.bp.blogspot.com/_ycHwJEosotY/Sd4uhqaNH7I/AAAAAAAAAtE/WN8IuU-aEr4/s320/WIDER+POSITION+SENSING+CIRCUIT+05.JPG" style="cursor: hand; display: block; height: 250px; margin: 0px auto 10px; text-align: center; width: 320px;" /></span></a><span style="font-family: arial;"><br /></span><br />
<br /><div>
<span style="font-family: arial;"><strong><span style="color: #009900;">Source </span></strong></span><span style="color: #33cc00; font-family: arial;">http://www.ssec.honeywell.com/magnetic/datasheets/an211.pdf</span><span style="font-family: arial;"><br /><br />HMC1501 / HMC1512<br />Linear / Angular / Rotary<br />Displacement Sensors<br />High resolution, low power MR sensor capable of measuring the angle<br />direction of a magnetic field from a magnet with <0.07> </span></div>
<div>
<span style="font-family: Arial;"></span></div>
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<span style="color: #33cc00; font-family: arial;"><a href="http://www.ssec.honeywell.com/magnetic/datasheets/hmc1501-1512.pdf">HMC1501 Datasheet pdf</a></span> </div>
</div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com1tag:blogger.com,1999:blog-7585646125282785821.post-27876073644109853182012-02-13T12:56:00.000-08:002012-02-13T12:56:12.826-08:00LCDs connected to the micro Controller<div dir="ltr" style="text-align: left;" trbidi="on">
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LCDs connected to the uC
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<span style="font-family: arial;">LCDs connected to the microcontroller in 4 bit data bus mode. LCD will require<br />a total of 7 data lines<br />3 control lines plus the 4 lines for the data bus in simple control LCD we will set</span><br /><span style="font-family: arial;">RW = 0(write only)</span><br /><br /><span style="font-family: arial;">- The EN line is called "Enable."<br />This control line is used to tell the LCD that you are sending it data.<br /><br />- The RS line is the "Register Select" line.<br />RS is low (0), the data is to be treated as a command or special instruction<br />RS is high (1), the data being sent is text data which sould be displayed on the </span><br /><span style="font-family: arial;">screen.<br /><br />- The RW line is the "Read/Write" control line.<br />RW is low (0), the information on the data bus is being written to the LCD.<br />RW is high (1), the program is effectively querying (or reading) the LCD.</span><br /><br /><br /><img alt="" border="0" height="267" src="http://photos1.blogger.com/blogger/3878/3180/400/LCD-conection.gif" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" width="294" /><br />
<br /></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-9705377816490677622012-02-13T12:53:00.001-08:002012-02-13T12:53:07.102-08:00LM231<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
LM231
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<span style="font-family: arial;">The LM231/LM331 family of <strong><span style="color: #3333ff;">voltage-to-frequency converters</span></strong><br />are ideally suited for use in simple low-cost circuits for<br />analog-to-digital conversion, precision <strong><span style="color: #3333ff;">frequency-to-voltage<br />conversion</span></strong>, long-term integration, linear frequency modulation<br />or demodulation, and many other functions</span><span style="font-family: arial;"><strong><span style="color: #ff6600;"></span></strong></span><br /><span style="font-family: arial;"><strong><span style="color: #ff6600;"></span></strong></span><img alt="" border="0" height="282" src="http://photos1.blogger.com/blogger/3878/3180/400/lm331-Block-Diagram.png" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" width="358" /><br /><span style="font-family: arial;"><strong><span style="color: #ff6600;">Features</span></strong><br />- Guaranteed linearity 0.01% max<br />- Improved performance in existing voltage-to-frequency<br />conversion applications<br />- Split or single supply operation<br />- Operates on single 5V supply<br />- Pulse output compatible with all logic forms<br />- Excellent temperature stability, ±50 ppm/°C max<br />- Low power dissipation, 15 mW typical at 5V<br />- Wide dynamic range, 100 dB min at 10 kHz full scale<br />- Wide range of full scale frequency, 1 Hz to 100 kHz<br />- Low cost</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-16232184336762766672012-02-13T12:52:00.001-08:002012-02-13T12:52:23.565-08:00Remote I/O expander circuit<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
Remote I/O expander circuit
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<span style="font-family: arial;">Each of the PCF8574’s eight I/Os can be independently<br />used as an input or output.</span><img alt="" border="0" height="296" src="http://photos1.blogger.com/blogger/3878/3180/400/io-expender-circuit.gif" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" width="295" /><br /><span style="font-family: arial;"><strong><span style="color: #3333ff;">PCF8574</span></strong>Remote 8-bit I/O expander for I2C-bus<br />The PCF8574 is a silicon CMOS circuit. It provides general<br />purpose remote I/O expansion for most <strong><span style="color: #33ff33;">microcontroller</span> </strong><br />families via the two-line bidirectional bus (I2C).<br /><br />The device consists of an 8-bit quasi-bidirectional port and<br />an <strong><span style="color: #ffcc00;">I2C-bus</span></strong> interface. The PCF8574 has a low current<br />consumption and includes latched outputs with high<br />current drive capability for directly driving LEDs. It also<br />possesses an <strong><span style="color: #00cccc;">interrupt</span></strong> line (INT) which can be connected<br />to the interrupt logic of the microcontroller. By sending an<br />interrupt signal on this line, the remote I/O can inform the<br />microcontroller if there is incoming data on its ports without<br />having to communicate via the I2C-bus. This means that<br />the PCF8574 can remain a simple slave device.<br /><br />Address of PCF8574 can set at pin A0,A1,A2</span><br />
<span style="color: #33cc00; font-family: arial;"><strong>slave addresses.</strong></span><br />
<img alt="" border="0" src="http://photos1.blogger.com/blogger/3878/3180/400/slave%20addresses..gif" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-82551322405189210072012-02-13T12:50:00.001-08:002012-02-13T12:50:31.048-08:00Simple Large Fan-In AND Gate circuit<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
Simple Large Fan-In AND Gate circuit
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<span style="font-family: arial;">We can make simple Large Fan-In AND Gate circuit by one Voltage </span><br /><span style="font-family: arial;">Comparators from circuit below<br /></span><span style="font-family: arial;"><img alt="" border="0" height="314" src="http://photos1.blogger.com/blogger/3878/3180/400/Large-Fan-In-AND-Gate-circuit.1.gif" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" width="355" /><br /><strong><span style="color: #339999;">Vout = A and B and C and D and ….</span></strong><br />This circuit is application of LM139<br /><strong><span style="color: #6600cc;">LM139</span></strong><br /><strong><span style="color: #3366ff;">Low Power Low Offset Voltage Quad Comparators</span></strong><br />The LM139 series consists of four independent precision<br />voltage comparators with an offset voltage specification as<br />low as 2 mV max for all four comparators. These were<br />designed specifically to operate from a single power supply<br />over a wide range of voltages.<br /><br />All pins of any unused comparators should be tied to the<br />negative supply.<br /><br />The output of the LM139 series is the uncommitted collector<br />of a grounded-emitter NPN output transistor. Many collectors<br />can be tied together to provide an <strong><span style="color: #cc6600;">output OR’ing function</span></strong>.<br /><img alt="" border="0" src="http://photos1.blogger.com/blogger/3878/3180/400/ORing-Outputs-circuit.0.png" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /><br /><br /><strong><span style="color: #00cccc;">Vo = A or B or C</span></strong></span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-41519454107472938502012-02-13T12:49:00.001-08:002012-02-13T12:49:36.090-08:005A switching regulator with Adjustable Current Limit<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
5A switching regulator with Adjustable Current Limit
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<a href="http://2.bp.blogspot.com/_ycHwJEosotY/SaH0pIJOVxI/AAAAAAAAATs/Yb5DRpF63g0/s1600-h/LM2679.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5305790823417141010" src="http://2.bp.blogspot.com/_ycHwJEosotY/SaH0pIJOVxI/AAAAAAAAATs/Yb5DRpF63g0/s320/LM2679.JPG" style="cursor: hand; display: block; height: 106px; margin: 0px auto 10px; text-align: center; width: 320px;" /></span></a><br /><div>
<span style="font-family: arial;"><strong><span style="color: #3333ff;">LM2679</span></strong>5A Step-Down Voltage Regulator<br />with Adjustable Current Limit </span></div>
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<span style="font-family: arial;"><br /><strong><span style="color: #3333ff;">Description</span></strong>The LM2679 series of regulators are monolithic integrated<br />circuits which provide all of the active functions for a stepdown<br />(buck) switching regulator capable of driving up to 5A<br />loads with excellent line and load regulation characteristics.<br />High efficiency (>90%) is obtained through the use of a low<br />ON-resistance DMOS power switch. The series consists of<br />fixed output voltages of 3.3V, 5V and 12V and an adjustable<br />output version.<br />The SIMPLE SWITCHER concept provides for a complete<br />design using a minimum number of external components. A<br />high fixed frequency oscillator (260KHz) allows the use of<br />physically smaller sized components. A family of standard<br />inductors for use with the LM2679 are available from several<br />manufacturers to greatly simplify the design process.<br />Other features include the ability to reduce the input surge<br />current at power-ON by adding a softstart timing capacitor to<br />gradually turn on the regulator. The LM2679 series also has<br />built in thermal shutdown and resistor programmable current<br />limit of the power MOSFET switch to protect the device and<br />load circuitry under fault conditions. The output voltage is<br />guaranteed to a ±2% tolerance. The clock frequency is<br />controlled to within a ±11% tolerance. </span></div>
<span style="font-family: arial;"><br /><strong><span style="color: #3333ff;">Features</span></strong>- Efficiency up to 92%<br />- Simple and easy to design with (using off-the-shelf<br />external components)<br />- Resistor programmable peak current limit over a range<br />of 3A to 7A.<br />- 120 mΩ DMOS output switch<br />- 3.3V, 5V and 12V fixed output and adjustable (1.2V to<br />37V ) versions<br />- ±2%maximum output tolerance over full line and load<br />conditions<br />- Wide input voltage range: 8V to 40V<br />- 260 KHz fixed frequency internal oscillator<br />- Softstart capability<br />- −40 to +125°C operating junction temperature range</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-68946629221517127992012-02-13T12:47:00.001-08:002012-02-13T12:47:46.133-08:00Half-wave precision rectifiers circuit<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
Half-wave precision rectifiers circuit
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<span style="font-family: arial;">A half-wave rectifier is a circuit that passes only the positive or only the negative<br />Portion of a wave ,while blocking out the other portion<br />Rectifiers are impremented using diodes. The <strong><span style="color: #339999;">nonzero forward-voltage drop</span></strong> of<br />A pactical diode may cause intolerable errors in <strong><span style="color: #339999;">low-level signal</span></strong><br /><br />Proceeding of half-wave precision rectifiers circuit we separate are two case<br /><strong><span style="color: #000099;">Case 1</span></strong> Vi > 0 negative input of <strong><span style="color: #33cc00;">op amp</span></strong> is higher positive input ,the op amp<br />Output = 0 ,I1 will flow through R1 and D1 ,hence Vo = 0<br /><img alt="" border="0" src="http://photos1.blogger.com/blogger/3878/3180/400/precision-rectifiers2.0.gif" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /><br /><strong><span style="color: #000099;">Case 2</span></strong> Vi <><br /><span style="font-family: arial;">Output = 1 </span><span style="font-family: arial;">,I2 will flow through R2,R1 and D2 ,but the voltage at positive input </span><br /><span style="font-family: arial;">Must equal the voltage at negative input ,hence I2 = (0-Vi)/R1 = (Vo-0)/R2 </span><br /><span style="font-family: arial;">This gives Vo = (-R2/R2)Vi</span><br /><br /><img alt="" border="0" height="240" src="http://photos1.blogger.com/blogger/3878/3180/400/precision-rectifiers3.gif" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" width="302" /><br /><span style="font-family: arial;"><span style="color: #3366ff;"><strong>Circuit behavior</strong></span>Vo = 0 for Vi > 0<br />Vo = -(R2/R1)Vi for Vi <><br /><span style="color: #3366ff;"><strong><span face="arial">Example waveform</span></strong></span><img alt="" border="0" height="211" src="http://photos1.blogger.com/blogger/3878/3180/400/waveform-rec.gif" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" width="268" /></span></span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-69273767373231790342012-02-13T12:46:00.001-08:002012-02-13T12:46:46.770-08:00PWM Generator with Current Limit Circuit<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
PWM Generator with Current Limit Circuit
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<a href="http://2.bp.blogspot.com/_ycHwJEosotY/SV689XCYHjI/AAAAAAAAAF8/37bs5l28pHU/s1600-h/PWM+Generator+with+Current+Limit+Circuit.JPG"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5286870774921567794" src="http://2.bp.blogspot.com/_ycHwJEosotY/SV689XCYHjI/AAAAAAAAAF8/37bs5l28pHU/s200/PWM+Generator+with+Current+Limit+Circuit.JPG" style="cursor: hand; display: block; height: 143px; margin: 0px auto 10px; text-align: center; width: 215px;" /></span></a><span style="font-family: arial;"> <strong><span style="color: #000099;">SG3524</span></strong><br /><br />The SG2524 and SG3524 incorporate all the<br />functions required in the construction of a<br />regulating power supply, inverter, or switching<br />regulator on a single chip. They also can be used<br />as the control element for high-power-output<br />applications. The SG2524 and SG3524 were<br />designed for switching regulators of either polarity,<br />transformer-coupled dc-to-dc converters, transformerless<br />voltage doublers, and polarity converter applications<br />employing <span style="color: #ffcc00;">fixed-frequency, pulse-width-modulation<br />(PWM) </span>techniques. The complementary output allows<br />either single-ended or push-pull application. Each device<br />includes an on-chip regulator, error amplifier, programmable<br />oscillator, pulse-steering flip-flop, two uncommitted<br />pass transistors, a high-gain comparator, and <span style="color: #00cccc;">current-limiting</span><br />and <span style="color: #3333ff;">shut-down circuitry</span>.</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-55234370056543819872012-02-13T12:43:00.001-08:002012-02-13T12:43:39.418-08:0012-Bit A/D Converter<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
12-Bit A/D Converter
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<span style="font-family: arial;"><strong><span style="color: #000099;">MCP3202</span><span style="color: #339999;">12-Bit A/D Converter with SPI® Serial Interface</span></strong>The Microchip Technology Inc. MCP3202 is a successive<br />approximation 12-bit Analog-to-Digital (A/D) Converter<br />with on-board sample and hold circuitry. The<br />MCP3202 is programmable to provide a single<br />pseudo-differential input pair or dual single-ended<br />inputs.<br /><br /><strong><span style="color: #6600cc;">FEATURES</span></strong><br />• 12-bit resolution<br />• ±1 LSB max DNL<br />• ±1 LSB max INL (MCP3202-B)<br />• ±2 LSB max INL (MCP3202-C)<br />• Analog inputs programmable as single-ended or<br />pseudo-differential pairs<br />• On-chip sample and hold<br />• SPI® serial interface (modes 0,0 and 1,1)<br />• Single supply operation: 2.7V - 5.5V<br />• 100ksps max. sampling rate at VDD = 5V<br />• 50ksps max. sampling rate at VDD = 2.7V<br />• Low power CMOS technology<br />- 500nA typical standby current, 5μA max.<br />- 550μA max. active current at 5V<br />• Industrial temp range: -40°C to +85°C<br />• 8-pin PDIP SOIC and TSSOP packages<br /></span><a href="http://ww1.microchip.com/downloads/en/DeviceDoc/21034c.pdf"><span style="color: #009900; font-family: arial;"><strong>MCP3202 Datasheet pdf</strong></span></a></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-52875253574323918852012-02-13T12:42:00.001-08:002012-02-13T12:42:36.563-08:004-to-16 Decoder IC<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
4-to-16 Decoder IC
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<span style="font-family: arial;"><strong><span style="color: #3333ff;">MM74HC154</span></strong><br /><br />New product of fairchild semoconductor<br />The MM74HC154 decoder utilizes advanced silicon-gate<br />CMOS technology, and is well suited to memory address<br />decoding or data routing applications. It possesses high<br />noise immunity, and low power consumption of CMOS with<br />speeds similar to low power Schottky TTL circuits. </span><br /><br /><img alt="" border="0" src="http://photos1.blogger.com/blogger/3878/3180/320/4-to-16%20%20Decoder%20IC.jpg" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /><br /><span style="font-family: arial;">The MM74HC154 have 4 binary select inputs (A, B, C, and<br />D). If the device is enabled these inputs determine which<br />one of the 16 normally HIGH outputs will go LOW. Two<br />active LOW enables (G1 and G2) are provided to ease<br />cascading of decoders with little or no external logic. </span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-71009267062434465452012-02-13T12:41:00.003-08:002012-02-13T12:41:54.231-08:002.5 V Voltage References IC<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
2.5 V Voltage References IC
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<span style="font-family: arial;"><strong><span style="color: #3366ff;">MCP1525 2.5 V Voltage References IC</span></strong></span><br /><span style="font-family: arial;"><strong><span style="color: #3366ff;"><img alt="" border="0" src="http://photos1.blogger.com/x/blogger/3878/3180/320/695995/2.5V%20Vref.jpg" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /></span><span style="color: #33ccff;">Description </span></strong><br />The Microchip Technology Inc. MCP1525/41 devices<br />are 2.5V and 4.096V precision voltage references that<br />use a combination of an advanced CMOS circuit<br />design and EPROM trimming to provide an initial<br />tolerance of ±1% (max.) and temperature stability of<br />±50 ppm/°C (max.). In addition to a low quiescent<br />current of 100 μA (max.) at 25°C, these devices offer a<br />clear advantage over the traditional Zener techniques<br />in terms of stability across time and temperature. The<br />output voltage is 2.5V for the MCP1525 and 4.096V for<br />the MCP1541. These devices are offered in SOT-23-3<br />and TO-92 packages, and are specified over theindustrial<br />temperature range of -40°C to +85°C.</span><br /><br /><br /><span style="font-family: arial;"><strong><span style="color: #009900;">Features</span></strong>• Precision Voltage Reference<br />• Output Voltages: 2.5V and 4.096V<br />• Initial Accuracy: ±1% (max.)<br />• Temperature Drift: ±50 ppm/°C (max.)<br />• Output Current Drive: ±2 mA<br />• Maximum Input Current: 100 μA @ +25°C (max.)<br />• Packages: TO-92 and SOT-23-3<br />• Industrial Temperature Range: -40°C to +85°C</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-15033218905080980692012-02-13T12:41:00.001-08:002012-02-13T12:41:17.742-08:0020-Bit ADC which digital filters<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
20-Bit ADC which digital filters
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<span style="font-family: arial;"><strong><span style="color: #66cccc;">CS5526</span></strong>CS5526 are highly integrated A/D converters which include<br />An instrumentation amplifier, a PGA (programmable gain<br />amplifier), eight digital filters, and self and system calibration<br />circuitry. </span><br /><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5061075191757262562" src="http://4.bp.blogspot.com/_ycHwJEosotY/RjyNEno7zuI/AAAAAAAAAAM/bXI_6kJ2sbk/s320/cs5526.JPG" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /><br />The converters are designed to provide their own negative<br />supply which enables their on-chip instrumentation<br />amplifiers to measure bipolar ground-referenced signals<br />±100 mV. By directly supplying NBV with -2.5 V and<br />with VA+ at 5 V, 2.5 V signals (with respect to ground)<br />can be measured.</span><br /><span style="font-family: arial;"><br /></span><br /><span style="font-family: arial;"><strong><span style="color: #33cc00;">Features </span></strong><br />lDelta-Sigma A/D Converter<br />- Linearity Error: 0.0015%FS<br />- Noise Free Resolution: 18-bits lBipolar/Unipolar<br />- 25 mV, 55 mV, 100 mV, 1 V, 2.5 V and 5 V<br />lChopper Stabilized Instrumentation Amplifier<br />lOn-Chip Charge Pump Drive Circuitry<br />l4-Bit Output Latch<br />lSimple three-wire serial interface<br />- SPI™ and Microwire™ Compatible<br />- Schmitt Trigger on Serial Clock (SCLK)<br />lProgrammable Output Word Rates<br />- 3.76 Hz to 202Hz (XIN = 32.768 kHz)<br />- 11.47 Hz to 616 Hz (XIN = 100 kHz)<br />lOutput Settles in One Conversion Cycle<br />lSimultaneous 50/60 Hz Noise Rejection<br />lSystem and Self-Calibration with<br />Read/Write Registers<br />lSingle +5 V Analog Supply<br />+3.0 V or +5 V Digital Supply<br />lLow Power Mode Consumption: 4 mW<br />- 1.8 mW in 1 V, 2.5 V, and 5 V Input Ranges</span><br /><span style="font-family: arial;"><br /></span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-89410917761879733812012-02-13T12:40:00.001-08:002012-02-13T12:40:32.865-08:00True RMS-to-DC IC<div dir="ltr" style="text-align: left;" trbidi="on">
<h3 class="post-title">
True RMS-to-DC IC
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<span style="font-family: arial;"><strong><span style="color: #000099;">MX536A and MX636</span><span style="color: #3366ff;">Maxim-IC</span></strong>The MX536A and MX636 are true RMS-to-DC converters.<br />They feature low power and are designed to accept<br />low-level input signals from <span style="color: #00cccc;">0 to 7VRMS for the MX536A<br />and 0 to 200mVRMS for the MX636</span>. Both devices accept<br />complex input waveforms containing AC and DC components.<br />They can be operated from either a single supply<br />or dual supplies. Both devices draw less than 1mA<br />of quiescent supply current, making them ideal for battery-<br />powered applications.</span><br /><br /><br /><br /><img alt="" border="0" id="BLOGGER_PHOTO_ID_5152284175255357698" src="http://1.bp.blogspot.com/_ycHwJEosotY/R4CXKM_2SQI/AAAAAAAAAAs/czjguRZOIyU/s320/MX636.JPG" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /><br /><span style="font-family: arial;"></span><br /><br /><span style="font-family: arial;"><strong><span style="color: #33cc00;">Feature</span></strong>- True RMS-to-DC Conversion<br />- Computes RMS of AC and DC Signals<br />- Wide Response:<br />2MHz Bandwidth for VRMS > 1V (MX536A)<br />1MHz Bandwidth for VRMS > 100mV<br />- Auxiliary dB Output: 60dB Range (MX536A)<br />50dB Range (MX636)<br />- Single- or Dual-Supply Operation<br />- Low Power: 1.2mA typ (MX536A)<br />800μA typ (MX636)</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-11115380280519829112012-02-13T12:39:00.003-08:002012-02-13T12:39:52.474-08:00Protected 2A Switch circuit<div dir="ltr" style="text-align: left;" trbidi="on">
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Protected 2A Switch circuit
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<span style="color: #009900; font-family: arial;"><strong>Protected 2A Switch with Isolated Inputs , Fault Output circuit</strong></span><br /><strong><span style="font-family: Arial;"></span></strong><br /><a href="http://2.bp.blogspot.com/_ycHwJEosotY/SEuD0AwouLI/AAAAAAAAAA0/fUrIJfG24pA/s1600-h/2A+protection2.GIF"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5209402323564542130" src="http://2.bp.blogspot.com/_ycHwJEosotY/SEuD0AwouLI/AAAAAAAAAA0/fUrIJfG24pA/s320/2A+protection2.GIF" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /></a><span style="font-family: arial;"><strong><span style="color: #000099;">LT1161</span></strong><br />The LT1161 is a quad high-side gate driver allowing the<br />use of low cost N-channel power MOSFETs for high-side<br />switching applications. It has four independent switch<br />channels, each containing a completely self-contained<br />charge pump to fully enhance an N-channel MOSFET<br />switch with no external components.<br /><br /><strong><span style="color: #00cccc;">Features</span></strong><br /><br />- Fully Enhances N-Channel MOSFET Switches<br />- 8V to 48V Power Supply Range<br />- Protected from –15V to 60V Supply Transients<br />- Individual Short-Circuit Protection<br />- Individual Automatic Restart Timers<br />- Programmable Current Limit, Delay Time, and<br />Auto-Restart Period<br />- Voltage-Limited Gate Drive<br />- Defaults to OFF State with Open Input<br />- Flowthrough Input to Output Pinout<br />- Available in 20-Lead DIP or SOL Package</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-29025455602824204072012-02-13T12:39:00.001-08:002012-02-13T12:39:12.109-08:00Overcurrent Protection Circuit<div dir="ltr" style="text-align: left;" trbidi="on">
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Overcurrent Protection Circuit
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<span style="font-family: arial;">Overcurrent Protection Circuit for High Side Relay Diver</span><br /><span style="font-family: arial;"><br /></span><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5212814980194976450" src="http://4.bp.blogspot.com/_ycHwJEosotY/SFejmxZbQsI/AAAAAAAAAA8/k6ZlmNjlo44/s320/Overcurrent.GIF" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /></span> <span style="font-family: arial;"><strong><span style="color: #000099;">LTC1154</span></strong><br />The LTC1154 single high side gate driver allows using low<br />cost N-channel FETs for high side switching applications. An<br />internal charge pump boosts the gate drive voltage above<br />the positive rail, fully enhancing an N-channel MOS switch<br />with no external components. Micropower operation, with<br />8μA standby current and 85μA operating current, allows<br />use in virtually all systems with maximum effi ciency.<br />Included on chip is programmable overcurrent sensing.</span><br /><span style="font-family: Arial;"></span><br /><span style="font-family: arial;">A time delay can be added to prevent false triggering on<br />high inrush current loads.</span><br /><br /><span style="font-family: arial;"><strong><span style="color: #009900;">Feature </span></strong><br />- Fully Enhances N-Channel Power MOSFETs<br />- 8μA IQ Standby Current<br />- 85μA IQ ON Current<br />- No External Charge Pump Capacitors<br />- 4.5V to 18V Supply Range<br />- Short-Circuit Protection<br />- Thermal Shutdown via PTC Thermistor<br />- Status Output Indicates Shutdown<br />- Available in 8-Pin SOIC and PDIP Packages</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-26199502250937787632012-02-13T12:38:00.002-08:002012-02-13T12:38:28.089-08:00Bidirectional Current Sensor<div dir="ltr" style="text-align: left;" trbidi="on">
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Bidirectional Current Sensor
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<span style="font-family: arial;">Bidirectional Hall Effect Based Linear Current Sensor with<br />Voltage Isolation and 20 A Dynamic Range</span><br /><span style="font-family: arial;"><br /></span><br /><span style="color: #000099; font-family: arial;"><strong>ACS706ELC-20A</strong></span><br /><img alt="" border="0" id="BLOGGER_PHOTO_ID_5214582553968018658" src="http://2.bp.blogspot.com/_ycHwJEosotY/SF3rNG02hOI/AAAAAAAAABE/9FUxlbNm63c/s320/Bidirectional+Current+Sensor.GIF" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /><span style="font-family: arial;">The Allegro ACS706 family of current sensors provides economical<br />And precise solutions for current sensing in industrial, automotive,<br />commercial, and communications systems. The device package allows<br />for easy implementation by the customer. Typical applications include<br />motor control, load detection and management, switched-mode power<br />supplies, and overcurrent fault protection.<br /><strong><span style="color: #00cccc;">Current Input Range Min -20 A Max 20 A<br />Output Voltage versus Current Input (Vcc = 5V)</span></strong></span><br /><br /><img alt="" border="0" id="BLOGGER_PHOTO_ID_5214582908987888882" src="http://2.bp.blogspot.com/_ycHwJEosotY/SF3rhxYL1PI/AAAAAAAAABM/_zEP74hZc-g/s320/Bidirectional+Current+Sensor+Iin+Vout.GIF" style="cursor: hand; display: block; margin: 0px auto 10px; text-align: center;" /><span style="font-family: arial;"><strong><span style="color: #009900;">Features</span></strong><br />• Small footprint, low-profile SOIC8 package<br />• 1.5 mΩ internal conductor resistance<br />• Excellent replacement for sense resistors<br />• 1600 VRMS minimum isolation voltage between pins 1-4 and 5-8<br />• 4.5 to 5.5 V, single supply operation<br />• 50 kHz bandwidth<br />• <span style="color: #ff6600;">100 mV/A</span> output sensitivity and 20 A dynamic range<br />• Output voltage proportional to ac and dc currents<br />• Factory-trimmed for accuracy<br />• Extremely stable output offset voltage<br />• Near-zero magnetic hysteresis<br />• Ratiometric output from supply voltage</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-22152569677692340572012-02-13T12:37:00.001-08:002012-02-13T12:37:23.192-08:00Power MOSFET Drivers Circuit<div dir="ltr" style="text-align: left;" trbidi="on">
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Power MOSFET Drivers Circuit
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<span style="font-family: arial;"><strong><span style="color: #000099;">1.5A Dual High-Speed Power MOSFET Drivers</span></strong></span><br /><br /><br /><img alt="" border="0" id="BLOGGER_PHOTO_ID_5271766618031066194" src="http://3.bp.blogspot.com/_ycHwJEosotY/SSkTzt6BDFI/AAAAAAAAABo/ONRWJ6e_MSQ/s320/TC4426.JPG" style="cursor: hand; display: block; height: 144px; margin: 0px auto 10px; text-align: center; width: 320px;" /><br /><span style="font-family: arial;">The TC4426A/TC4427A/TC4428A are improved<br />versions of the earlier TC4426/TC4427/TC4428 family<br />of MOSFET drivers. In addition to matched rise and fall<br />times, the TC4426A/TC4427A/TC4428A devices have<br />matched leading and falling edge propagation delay<br />times.</span><br />
<span style="font-family: arial;"><strong><span style="color: #009900;">Features:</span></strong>- High Peak Output Current – 1.5A<br />- Wide Input Supply Voltage Operating Range: 4.5V to 18V<br />- High Capacitive Load Drive Capability – 1000 p in 25 ns (typ.)<br />- Short Delay Times – 30 ns (typ.)<br />- Matched Rise, Fall and Delay Times<br />- Low Supply Current:<br />- With Logic ‘1’ Input – 1 mA (typ.)<br />- With Logic ‘0’ Input – 100 μA (typ.)<br />- Low Output Impedance – 7Ω (typ.)<br />- Latch-Up Protected: Will Withstand 0.5A Reverse Current<br />- Input Will Withstand Negative Inputs Up to 5V<br />- ESD Protected – 4 kV<br />- Pin-compatible with TC426/TC427/TC428 and<br />TC4426/TC4427/TC4428<br />- Space-saving 8-Pin MSOP and 8-Pin 6x5 DFN Packages</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-70428757214278835522012-02-13T12:35:00.005-08:002012-02-13T12:35:59.646-08:00PWM using 555<div dir="ltr" style="text-align: left;" trbidi="on">
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<span style="color: #000099; font-family: arial;"><strong>PWM using 555</strong></span><br /></div>
<a href="http://3.bp.blogspot.com/_ycHwJEosotY/SVXhFrXFRfI/AAAAAAAAAEU/yGJmM9aWeck/s1600-h/del00011.png"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5284377225444279794" src="http://3.bp.blogspot.com/_ycHwJEosotY/SVXhFrXFRfI/AAAAAAAAAEU/yGJmM9aWeck/s320/del00011.png" style="cursor: hand; display: block; height: 195px; margin: 0px auto 10px; text-align: center; width: 320px;" /></span></a><br /><span style="font-family: arial;">IC1 astable gives a fixed square wave at pin 3, C1 and R1 derive<br />uS trigger pulses from IC1 and this will trigger IC2 monostable or<br />single shot, the voltage at pin 5 of IC2 will change the pulse width<br />output of IC2, to get it working all the three RC combinations<br />have to be figured out</span></div>pinoutshttp://www.blogger.com/profile/02776021665841068001noreply@blogger.com0tag:blogger.com,1999:blog-7585646125282785821.post-75563356302919198142012-02-13T12:35:00.003-08:002012-02-13T12:35:35.010-08:00PWM Generator Circuit by Digital register method<div dir="ltr" style="text-align: left;" trbidi="on">
<span style="font-family: arial;"><strong><span style="color: #000099;">PWM Generator Circuit by Digital register method</span></strong></span><br />
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<a href="http://4.bp.blogspot.com/_ycHwJEosotY/SVXhcKQ4BLI/AAAAAAAAAEc/f9efCUJBcOY/s1600-h/DigitalRegisterCct.gif"><span style="font-family: arial;"><img alt="" border="0" id="BLOGGER_PHOTO_ID_5284377611696866482" src="http://4.bp.blogspot.com/_ycHwJEosotY/SVXhcKQ4BLI/AAAAAAAAAEc/f9efCUJBcOY/s320/DigitalRegisterCct.gif" style="cursor: hand; display: block; height: 232px; margin: 0px auto 10px; text-align: center; width: 320px;" /></span></a><span style="font-family: arial;"> an example circuit using the digital comparison method<br />when a microcontroller is available to set the 4-bit digital register<br />value. A write strobe is required from the micro to latch the 4 data<br />bits into the register. The 74HC161 counter is free-running,<br />the frequency being set by the 74HC14 oscillator section, where<br />it is roughly f = 1/(6.3RC). The resulting frequency of the PWM<br />signal will be 16 times less than this counter clock frequency,<br />since it requires 16 pulses to complete one "revolution" of the<br />counter. With R=2k and C=1nF this results in a counter<br />frequency of approximately 80kHz which will result in a PWM signal<br />frequency of 5kHz.</span></div>
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