Hello Nvidia !
I have designed a Tx2i custom carrier board in order to provide 4 GbEth link via a managed switch.
I have read the TX2i design guide, and i still have some troubles to auto boot my tx2i.
The design guide says:
The TX2i PMIC has a level sensitive on input, so in order to power automatically when the main power is applied (Auto-Power-On), all that is required is for the POWER_BTN# pin to be pulled up. Since this pin is pulled up on the module, it can be left unconnected for Auto-Power-On to be supported.
So, like a fool, i have just connected the main supply to the module. (i also have a 0R resistor to GND on CHARGER_PRSNT#, which seems to be the way to go to also support Tx2 modules). These are the only pin connected, all the others are floating.
But, when 12V main power is applied, i have no lifesign on UART0. Input current is @135mA during ~10s, then fall to 120mA.
I am aware about the strapping options, anyway all my level translators are disabled (HiZ).
Unfortunately, i don’t have any Jetson Eval board supporting a tx2i module. I only have a Tx1 developer kit. So i can’t test it outside my board.
My questions are :
- Is VIN_PWR_BAD# needed in my case ? (pullup on tx2i module)
- Dumb question, but did my brand new tx2i module came with a working system ? (Uboot a least)
- do you have any hint or idea to help me ? :) Maybe i missed some design instructions. It is not very clear what you need/don’t need when you have to support autoboot.
Just for background, last year i have successfully designed a tx1 custom carrier board, with no big problems beside boot strapping. The Tx2i seemed to be the easy one regarding autoboot…
Thank you in advance,