nRF9160 Problem with I2C when two sensors are connected.

[wasan]

My project requires two sensors to operate on the same i2c bus, one of which is a display and the other of which is a touch sensor.
And I have a problem where, if I test both devices without connecting them simultaneously, both will function normally. But when I combine them, the touch sensor does not immediately function.
Using an oscilloscope to detect the signal, I discovered that when I send Address 0x38, which is the number of the touchscreen sensor in Bit 9, there appears to be an incomplete Logic High signal.
And I'm uncertain how this signal originated. Does anyone have any idea what could be causing this issue?

Note: R Pullup is 4.7K, Bus speed 100KHz, wring distance 20 cm.

[Vidar Berg]

Hi,

20 cm is fairly long for i2c. Is it possible to shorten it a bit? You may also try enable high drive on the pins as suggested in the "Pullup resistor" of the TWIM chapter.

Best regards,

Vidar

[wasan]

Sorry for the late answer. I found the root cause problem. There was a problem with the sensor ic. I've already talked to the my supplier that makes my sensors about how to fix this problem.

Thank you.

[noob_123]

How did you configure two different sensors on the same i2c bus? Did you create two different instances? Can you elaborate on how you did this?