I2cdetect fails when i2c device is tested on Jetson Nano

Robotics & Edge Computing Jetson Systems Jetson Nano
1

Hi ,

I have connected MLX90640 IR sensor to i2c1 bus of Jetson nano. But its not detected most of the times. The detection ratio is like 1 out of 25 times. I have probed the i2c lines while using “i2cdetect -y -r 1” command to detect the MLX90640 device on i2c bus, but i found that SCL is pulling low & not releasing at all.

image

Initially without any operation on the i2c bus, both SDA & SCL is with 3.3 v.
Any operation on the i2c bus makes the clock signal low & never released.
Added 2.4k pullup resistor on MLX90640. But the issue is still not solved.
Tested some other I2C device (Potentiometer ) on jetson nano & its detected successfully.
Tested MLX90640 on beaglebone & its detected

I2C timeout
5

hello karthik.rao,

it usually power issues to caused i2c communication failed, please review your regulator settings.
thanks

6

Hi JerryChang,

It is true that the I2C communication failed due to power issues. The issue has been resolved. Thankyou for your kind response.