Hello, I have a project creating a Carrier board for a Jetson nano, trying to expand every possible peripheral. Refer to the datasheet and device instructions.
[ Circuit design ]
The circuit design and selection of part numbers for all components I refer to the OrCAD schematics from Jetson download center. However, some components were not widely available at the time. So I replaced it with another part with similar specifications. such as (OrCAD’s part → Replaced), (DMN26D0UFB4 → FDY301NZ), (2N7002DW → NTJD5121NT1G) and replaced the power switch of HDMI and DP by BD2222G-GTR. And check the component that has NO STUFF specified. I understand that there is no need to place that component when assembling. Specifically, a 0 ohm resistor.
[ Plug the power ]
I’ve tried powering it with 5V 2A DC Jack Adapter, but the circuit to switch power between the DC Jack and Micro-USB is incomplete. But the board is still powered normally and the SDK Manager can find the Jetson nano connected via Micro-USB in Recovery mode.
I was install the Jetson nano SOM on a SODIMM and tried powering the Carrier board, and then I found that the LED that was triggered by the PWR_LED_CTRL pin came on. And I measured the voltage on each net, for example VDD_5V_IN, 3.3V from Buck converter, 1.8V from LDO regulator and the voltage on the port of HDMI and DP. which all came out normal.
Then I connected my screen to the Carrier board with HDMI hoping it would show up. But nothing happened. So I’m not sure if the Jetson nano has turned on correctly.
[ Debugging ]
I measured the POWER_EN and SYS_RST signals coming out of the SOM to check if they followed the Design Guidelines, and they did.
And I have connected the UART2 to the Docklight on the net after the voltage translator and directly on the SOM pin, and no message appears on both.
Moreover, I don’t know what issue I should investigate further.
Thank you