Power sequence and timing for SYS_HV and SYS_MV

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
1

Hi Nvidia forum,

I’am currently working on custom board with 3 Xavier AGX modules.
I’ve read the OEM Design guide document but can’t find the information about timing between SYS_VIN_HV and SYS_VIN_MV.

I want to know what will happen if I provide SYS_VIN_HV at power On of the board (without power button) and then provide SYS_VIN_MV (maybe some secondes after)?

Thanks for any answers.
BR.

3

There is no strict timing request between HV and MV, it is possible to have seconds delay. The key points of power on sequence is to let vin_pwr_bad rise after power supply (HV and MV) is stable and then enable module_power_on and then is carrier_power_on.

4

Hi,

What about If the +3V3 and 1V8 of the carrier board are already ON before SYS_HV or SYS_MV rise.
How mandatory is the power discharge circuitry ?

Br.

5

Carrier board power rails must be ON later than module.