Custom Jetson Carrier Board GPIO_EXP0_INT & TCA9539PWR

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi,

I am facing a custom carrier board for the Jetson TX2. Our carrier board design is based on the C02 carrier board for the Jetson TX2 module.

On the TCA9539PWR datasheet, GPIO expansor of the Jetson C02 board, manufacturer said that INT# pin is an open drain (page19), so a pull-up resistor must be placed on this pin for the correct behaviour of the TCA9539PWR.

Despite this, I can not be able to find the PullUp resistor on the C02 schematics. On the Jetson TX2 Pinmux the pins A22 and A23 of the module (the ones tied to INT pins of the TCA9539PWR) are configured in ‘pd’(pulldown?).

Are this Interrupt triggered properly in the C02 board? Shall I just left the design with no pull-up resistor? Shall we just change ‘pd’ property in the pinmux table to ‘pu’? Shall we introduce a pull-up resistor in our design?

Thanks in advance,

Best Regards,

Juanjo

2

For the two INT pin (A22,A23), the SW have enable the internal PU, the PU also have in pinmux file,
Maybe you see the PD in pinmux that is POR state, but not SW setting. please see AS COL in pinmux file.

3

Thanks a lot for the answer.

Best Regards,

Juanjo