NX I2C can't detect TI IO Expander(0x74)


This is our carrier board.
L4T 32.6.1

TI IO Expander TCA9539 is 0x74.
If we run sudo i2cdetect -r -y 8 with Xavier NX, it can’t detect 0x74 address.
The other devices are good.
( We also use the NX develop kit to detect it, that is identical.)

If we run sudo i2cdetect -r -y 8 with Nano, it can detect 0x74 address.

Do you have any suggestion?


Do you mean this only happen on your custom board and not with devkit? If so, please compare your design with devkit (you can get the carrier schematic in DLC), and eliminate the possible risk points firstly.

Hi Trumany,

No, It also cant not detect the 0x74 device with NX devkit.
The PCB design was verified by TX1/TX2/Nano. They are good.

The current status:
Enable IO expendar driver, It is UU at 0x74 address now.
We are checking the function.



When using driver, The function is workable.

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