Confirming TX2 auto-power-on behavior

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hello,

I am working on a custom carrier board and want to confirm the behavior of auto-power-on:

  • Can you provide a schematic for the auto-power-on circuit that is on the TX2 module?
  • Can you provide the part number for the TX2’s PMIC?
  • What is the behavior of the auto-power-on circuit after a PMIC reset (RESET_IN# active)? Does the ACOK bit persist after a PMIC reset? If not, will ACOK be pulled low 300 ms after the PMIC reset or will the TX2 have to be fully power cycled (VDD_IN removed)?

Thanks.

3

hello ck240,

you may refer to Jetson TX2 Series OEM Product Design Guide for the power circuit.
there’s also a session for power-on control you may check for more details.
thanks

4

Hi Jerry,

The OEM product design does not clearly answer the questions in my original post. If you are able to, providing a schematic for the auto-power-on circuit and the part number for the PMIC would help me find the information I need.

Thanks.

6

The module schematic is not public. PMIC part number is MAX77620. ACOK is always tied to ground on carrier board for auto-power-on.

7

Thank you for confirming the PMIC part number.

I am still wondering about the auto-power-on-circuit behavior during two events:

  1. Assume CHARGER_PRSNT is tied to ground on the carrier board. RESET_IN is then activated some time after initial boot, resetting the PMIC. VDD_IN remains connected. Will the TX2 auto-power-on after the reset?

  2. Assume CHARGER_PRSNT is tied to ground on the carrier board. VDD_IN browns out some time after initial boot, resulting in VIN_PWR_BAD becoming active. The PMIC shuts down. Once VIN_PWR_BAD is no longer active, will the TX2 auto-power-on?

8

  1. RESET process is not auto-power-on, whole system will reset (restart) with RESET_IN asserted.

  2. It also depends on the action of VDD_IN. If VDD_IN is stable and vin_pwr_bad is asserted and then de-asserted, the auto-power-on will be triggered.

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