We have strong ESD sensitivity on our battery powered system. (USB-PD: TPS65987DDHRSHR, BMS: BQ25713BRSNT, Protector: BQ7791500PWT), it seems to be very vulnerable when the shield of the USB-C connector (connected to GND) picks up ESD events. (There are already events of well below 4kV). I think our logic level protection is okay, we use the TPD6S300ARUKR protector.
We have a separate PCB on which the PD, BMS and battery protector sits. From this PCB run cables for GPIO and i2c and of course the power supply to the rest of the system.
Our main Problem is, that our SOM (Jetson Nano) restarts every time we have a ESD-Event on the USB-Shield. The SOM is on an other PCB and the problem also occurs when only the power supply (BQ25713BRSNT VSYS and GND) goes from one PD-PCB to the other. We use massive groundplanes but the batteries (on BQ7791500PWT) are connected via about 100mm long 20awg cables (3 cables to +, 3 cables to - and 1 each to balance). Since we have a plastic case, there doesn't seem to be enough drain/capacity for the ESD event. I had hoped that the batteries could compensate for this but this does not seem to be the case, are there ways to fix the problem?
Or is there any best practice for my case (battery system in plastic housing)?
-
Ask a related question
What is a related question?A related question is a question created from another question. When the related question is created, it will be automatically linked to the original question.
