Detecting ignition on/off through GPIO in a 12V automotive scenario. What is the preferred way to drive the input, protecting it from getting fried by electrical disturbances at a budget?

MikeMike · ‎2022-05-16

Will a voltage divider and a Zener diode pretty much suffice or will galvanic separation be necessary? Does anyone know/have an out-of-the-box solution?

Thanks,

Mike

gbm · ‎2022-05-17

Single 220 kOhm series resistor should be enough.

My STM32 stuff on github - compact USB device stack and more: https://github.com/gbm-ii/gbmUSBdevice

Javier1 · ‎2022-05-17

https://www.sunrom.com/p/tvs-diode-12v-bidirectional-smbj12ca-smb

check out TVS (Transient voltage supressor) diodes .

in automotive scenarios i always protect against 120V spikes from the battery (they do happen specially at motor startup/stall)

Available for consulting/freelancing , hit me up in https://github.com/javiBajoCero

Javier1 · ‎2022-05-18

*automotive scenario*

Available for consulting/freelancing , hit me up in https://github.com/javiBajoCero