arajasek
Posts: 39
Joined: Fri Oct 06, 2017 2:17 pm

EMMC_EN_N to drive LED

Wed Dec 06, 2017 8:54 pm

Can EMMC_EN_N_ pin in CM3 Lite be used to as a boot led that shows that the compute module is reading sd card data and booting? I am not using the usb boot option so will it work if I just connect the LED anode to EMMC_EN_N (GPIO 47)?

rzusman
Posts: 309
Joined: Fri Jan 01, 2016 10:27 pm

Re: EMMC_EN_N to drive LED

Sat Dec 09, 2017 10:45 pm

You can use EMMC_EN_N to flash an activity LED, but you should probably drive the LED with a low-threshold FET, like SSM3K329RLFCT-ND (from DigiKey).
This is what I do, and it works fine.

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