Timeline for microcontroller input protection with Schottky clipping diodes
Current License: CC BY-SA 3.0
8 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 10, 2015 at 17:00 | comment | added | KyranF | Pascalm, see my answer here, and see that the input series resistor limits current in the condition that there is a constant/"slow" over-voltage condition on that pin: electronics.stackexchange.com/questions/163464/… | |
| Jun 10, 2015 at 13:40 | answer | added | pascalm | timeline score: 0 | |
| Jun 10, 2015 at 11:17 | answer | added | Jimbolayo | timeline score: 0 | |
| Jun 10, 2015 at 8:47 | comment | added | Russell McMahon♦ | ... I have seen such charges cause IC misoperation and ICs take minutes to hours after power down for such charges to leak away and return normal operation. Any situation where body diodes conduct falls at best in the "absolute maximum" datasheet area and outside the guaranteed operating conditions area. | |
| Jun 10, 2015 at 8:46 | comment | added | Russell McMahon♦ | @Jon'sanswer is good. Note that while the ESD protection diodes clamp controller pins (in most cases) at about 0.6V above or below supply rails, any current that they conduct has the potential to cause problems. This is covered by other SE EE answers. What happens is that the clamp diodes are between pin and the IC substrate and the point of injection and the path it then takes are not defined. Even extremely small currents can end up charging isolated nodes which are not designed to ever be charged and spurious FETs can be formed or existing ones can be controlled in unintended manners. ... | |
| Jun 10, 2015 at 8:38 | answer | added | Jon | timeline score: 6 | |
| Jun 10, 2015 at 8:21 | comment | added | Al Bundy | In addition to clipping diode there is always extra resistor whose function is to dissipate energy and voltage of the overvoltage. | |
| Jun 10, 2015 at 8:16 | history | asked | pascalm | CC BY-SA 3.0 |