I have a custom carrier board for the Orin AGX module (the ones I have on hand are not the industrial ver.) and I am unable to successfully go through the power up sequence. I have already gone through all of the documentation and power on sequence graphs, none of which is helpful.
Looking at the power up sequence signals, I can see that MODULE_SHDN_N (green) is not going high between MODULE_POWER_ON (pink) and CARRIER_POWER_ON (yellow). SYS_RESET_N (blue) never goes high and CARRIER_POWER_ON goes back low after ~50 ms.
Looking at the same signals on the dev kit (and trying the same module, as well as a known working module that boots), I can see MODULE_SHDN_N (green) gets pulled high between MODULE_POWER_ON (pink) going high and CARRIER_POWER_ON (yellow) going high. SYS_RESET_N (blue) goes high after ~60 ms.
Enabling a ~40 kOhm pull up on our MCU’s pin that’s connected to MODULE_SHDN_N does not pull up the signal to 1.8V, but only ~400mV. It still gets driven low by the module after MODULE_POWER_ON is enabled. Removing the module I can see the 1.8V pull up is working as intended.
Looking at the power rails on the dev kit, I can see that contrary to the documentation, the HV 12V VCC_SRC (blue) goes up before MV 5V VDD_5V (green) goes up. We tried to do the same on our custom carrier board but the problem shown above persists in both setups.
What could possibly be causing the module to drive MODULE_SHDN_N low the whole time?