I’m facing an issue with power module(5V, VDD_IN): Tried to connect one camera, one wireless dongle(mouse) and one USB memory stick to the USB ports, system was warning with: System is now being throttled, system was throttled due to low input voltage.
As I tried to check the VDD from /sys/bus/i2c/drivers/ina3221x/6-0040/iio_device, I found that if no USB device was plugged in, the value for “in_voltage0_input” is around 4960, which is 4.96 V, once I connect the camera, dongle and USB memory stick, it drops to 4680 which is 4.68 V, thus causing the warning and sometimes makes the camera not working.
Also I tried to replace the DC power supply with a controllable source, I found that from the DC power supply, the output voltage is correctly at 5V, which is strange that the INA3221 measured VDD_IN is dropping to 4.68V. Additional external USB device should not cause the voltage drop. Could you kindly help to check the root causes and possible solution.