Editing Input protection
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− | == | + | == signal input protection == |
Alas, people outside the electronics world live in places that have "low humidity" and "carpeted floors". | Alas, people outside the electronics world live in places that have "low humidity" and "carpeted floors". | ||
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A variety of signal input protection circuits: | A variety of signal input protection circuits: | ||
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− | + | resistor | |
− | + | zener | |
− | + | 2 clamping diodes to plus and minus power rails | |
− | + | 2 Schottky clamping diodes to plus and minus power rails | |
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+ | 2 Schottky clamping diodes to plus and minus power rails, and a resistor. (All 3 components directly connected to the microcontroller input pin; the other end of the resistor connected to the outside world). | ||
[http://www.piclist.com/techref/mimedecode.asp?url=piclist%5C2006%5C03%5C06%5C111156a%2Etxt&part=3] | [http://www.piclist.com/techref/mimedecode.asp?url=piclist%5C2006%5C03%5C06%5C111156a%2Etxt&part=3] | ||
− | + | transistor buffer ([http://www.piclist.com/techref/postbot.asp?by=time&id=piclist\2007\03\22\101919a Matt Pobursky]) | |
... | ... | ||
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[[Reverse Protection Diodes]] (protects against reversed GND and +power) | [[Reverse Protection Diodes]] (protects against reversed GND and +power) | ||
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fuses | fuses | ||
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... or some combination. | ... or some combination. | ||
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+ | [http://sound.westhost.com/impedanc.htm#spkz "Speaker Protection Systems"] | ||
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-- Tjaart van der Walt 1999 | -- Tjaart van der Walt 1999 | ||
[http://www.piclist.com/techref/postbot.asp?by=time&id=piclist\1999\05\01\151255a.txt] | [http://www.piclist.com/techref/postbot.asp?by=time&id=piclist\1999\05\01\151255a.txt] | ||
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"DESIGNING ELECTRONIC EQUIPMENT FOR ESD IMMUNITY: Annotated Bibliography | "DESIGNING ELECTRONIC EQUIPMENT FOR ESD IMMUNITY: Annotated Bibliography | ||
http://www.dbicorporation.com/esd-anno.htm | http://www.dbicorporation.com/esd-anno.htm | ||
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"AP-125 Designing Microcontroller Systems for Electrically Noisy Environments" | "AP-125 Designing Microcontroller Systems for Electrically Noisy Environments" | ||
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---- | ---- | ||
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Russell McMahon says | Russell McMahon says | ||
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* "Fundamentals of PolySwitch Overcurrent and Overtemperature Devices" http://www.circuitprotection.com/06Databook/fundamentals/PSWFundamentals.pdf | * "Fundamentals of PolySwitch Overcurrent and Overtemperature Devices" http://www.circuitprotection.com/06Databook/fundamentals/PSWFundamentals.pdf | ||
* 4 page overview and selector guide http://www.circuitprotection.com/06Databook/PSWFundamentals(80-83).pdf | * 4 page overview and selector guide http://www.circuitprotection.com/06Databook/PSWFundamentals(80-83).pdf | ||
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== Input Protection by Circuit Type == | == Input Protection by Circuit Type == | ||
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=== Blocking Diode === | === Blocking Diode === | ||
− | === | + | === Zeener Diode === |
=== Crowbar Circuits === | === Crowbar Circuits === | ||
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== Input Protection by what is being Protected == | == Input Protection by what is being Protected == | ||
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+ | === Semiconductors and Static Discharge === | ||
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+ | Static discharge can damage a wide range of semiconductors, through inputs or any other connection. More discussion would be nice. | ||
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=== Analog to Digital Converter Input Protection === | === Analog to Digital Converter Input Protection === | ||
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Filtering the high frequency response of an ADC input can also be useful if there are large variations at a frequency higher that you want to, or the ADC can resolve. | Filtering the high frequency response of an ADC input can also be useful if there are large variations at a frequency higher that you want to, or the ADC can resolve. | ||
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=== Power Supply Input Protection === | === Power Supply Input Protection === | ||
− | == | + | == further reading == |
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* [http://www.ce-mag.com/99ARG/Bjorklof&Joha124.html CE magazine: "Immunity Testing: Practical Aspects of Basic Standards"] by Dag Björklöf and Lars-Olov Johansson | * [http://www.ce-mag.com/99ARG/Bjorklof&Joha124.html CE magazine: "Immunity Testing: Practical Aspects of Basic Standards"] by Dag Björklöf and Lars-Olov Johansson | ||
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