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,