Power On Sequence for AGX ORIN Jetson in Auto Power ON

[sagar.kumar2]

Hi,

I am using auto power on for JETSON AGX ORIN SOM Module. But in design guide there is no details/diagram about power on sequence. Please let me know do we need to follow any power on sequence or just simply provide SV, MV and HV power to module?

Thanks
Sagar

[Trumany]

Hi, there is such sequence in DG as below.

[sagar.kumar2]

Hi Trumany,

In this diagram, there is a signal VIN_PWR_ON which is generated from Power button circuitry. So if i am using auto power on i will not use power button circuitry then how i will generate VIN_PWR_ON?

And in this diagram BUTTON_POWER_ON, POWER_BTN_N and ACOK are also present. Is it needed for Auto power on case?

Thanks
Sagar

[Trumany]

BUTTON_POWER_ON, POWER_BTN_N and VIN_PWR_ON are not must for auto power on case. This sequence is for the design with MCU to enable module_power_on with ACOK. If you don’t use MCU, you can just use ACOK to enable module_power_on after VIN_SV/HV/MV are stable enough.

[Trumany]

As said in DG:

5.3.1 Auto Power-on
If the system does not require a power button or equivalent, and should power on when the main power source is connected, the following requirements should be met:
 SYS_VIN_HV, SYS_VIN_MV, and SYS_VIN_SV (JAOi only) should be powered on. These can be optionally gated and a signal used to enable them when the module is detected mounted correctly using PRSNT[1:0].

 VDDIN_PWR_BAD_N should be de-asserted (high) once the SYS_VIN_HV/MV supplies are enabled and stable.

 MODULE_POWER_ON should be asserted (high)

Note: The design should de-assert (low) MODULE_POWER_ON if VDDIN_PWR_BAD_N is asserted
(low), CARRIER_POWER_ON is de-asserted (low), or MODULE_SHDN_N is asserted (low).

[sagar.kumar2]

Hi Trumany,

But during first flashing time we need to press power_button and force recovery button simultaneously then how auto power on work without Button MCU circuitry?
Read 4 & 5 points in attached image.

[sagar.kumar2]

Hi Trumany,

Do we have any update on it?

Thanks
Sagar

[Trumany]

Are you make a custom board without power button, and only auto power on? If so, you need to add a recovery button. When you want to enter recovery mode, you only need to hold recovery button and plug in power cable.

[sagar.kumar2]

Yes I am making custom board so that whenever my board connected to backpanel it starts booting automatically.

So for first time programing we need recovery button connected directly connected on FORCE_RECOVERY_N Pin to make it short to GND. Is my understanding correct?

one more doubt since Orin module have Power On Button circuitry. Then what is the need of it in my auto power on case? And

If it is needed then how to program it?

Thanks
Sagar

[Trumany]

Is my understanding correct?
Yes.

what is the need of it in my auto power on case?
It can be waived in auto power on design.