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It's kind of surprising that the TVS diodes dumping ESD into the GND plane don't affect the microcontroller; however, if the shield dumps ESD into the GND plane it has a very strong effect. Th...
Answer
#2: Post edited
by
coquelicot
·
2020-12-26T18:43:14Z (almost 4 years ago)
- >It's kind of surprising that the TVS diodes dumping ESD into the GND plane don't affect the microcontroller; however, if the shield dumps ESD into the GND plane it has a very strong effect.
- That's what makes me think that the answer of Nick Alexeev is very relevant: the TVS diode has a small capacitance, and apparently, this capacitance absorbs much of the ESD shock, like the RC combination in Nick Alexeev answer.
- It would be interesting to try improving this RC combination by the following:
- 
- >It's kind of surprising that the TVS diodes dumping ESD into the GND plane don't affect the microcontroller; however, if the shield dumps ESD into the GND plane it has a very strong effect.
- That's what makes me think that the answer of Nick Alexeev is very relevant: the TVS diode has a small capacitance, and apparently, this capacitance absorbs much of the ESD shock, like the RC combination in Nick Alexeev answer.
- It would be interesting to try improving this RC combination by the following:
- 
- Note: the RC network in Nick Alexeev's answer recalls me the so called "RC snubber" circuit.
#1: Initial revision
by
coquelicot
·
2020-12-26T18:34:06Z (almost 4 years ago)
>It's kind of surprising that the TVS diodes dumping ESD into the GND plane don't affect the microcontroller; however, if the shield dumps ESD into the GND plane it has a very strong effect. That's what makes me think that the answer of Nick Alexeev is very relevant: the TVS diode has a small capacitance, and apparently, this capacitance absorbs much of the ESD shock, like the RC combination in Nick Alexeev answer. It would be interesting to try improving this RC combination by the following: 