TX2 failed to boot on my designed board

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hello,
I have designed my own board reference NV’s carrier board(P2597_B04).TX1 works well on my board.However,it cannot boot when I connect TX2 on my board,but it can boot on NVIDIA carrier board.
And I check the strapping pin(Jetson TX2 OEM Product Design Guide).Pin D9(UART1_TX) in my design have connected a level-shift chip(TXB0108).Pin G11、D8、H10、G10 are left floating.
Could you give us some advice? Thank you very much!

2

Hi, did you measure the status of Pin D9 when boot? It should be low. The level shift might pull it up during boot.

3

Hi,Trumany.
Thank you for your advice.I have measured the voltage of Pin D9 when TX1 is connected on my board.Before the button is pushed,the level of Pin D9 is 0V.When I push the button.The level of Pin D9 has raised 1.8V.
However,I have connected the TX2,the level of Pin D9 is always 0V.

4

Hi,Trumany.
If I remove the level-shift chip(TXB0108) Or replace it with SN74LVC2T45, can this problem be solved?

5

You can try removing level-shift.

6

TX2 can not boot when i remove the level-shift chip(TXB0108).I don’t konw why it is.

7

Not sure why this happen… you can compare the pin status between dev kit and your own board during power on process so as to confirm no violation.

8

I tested the power-related pins and power-up sequence without any problems.And I remove the level-shift chip(nothing connected to D9),the voltage of Pin D9 is still 0V during power on.I measured the NV CB,pin D9 is 1.8V.I was confused by this phenomenon.

9

You can try replacing it with SN74LVC2T45, there also can be other pin status issue, please compare the difference carefully.