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Role of the p-type JFET(MMBFJ177) in EC sensor channels

Category: Hardware
Product Number: EVAL-ADuCM355, ADuCM355

Regarding the EC sensor section in this evaluation board, I would like to understand the specific role of the P-type JFET (MMBFJ177) to determine if it's necessary for my system.

I would greatly appreciate it if you could elaborate on its function. Thank you for your time and help.