Hi! I am struggling with interfacing the CH201 chip from my SAMD21G18A MCU.
I am currently trying to do a simple I2C scan of all available nodes on the I2C bus. This part of the program i working fine as other I2C devices on the same bus do respond.
My schematics is attached. As you can see, I have a standard 3.3V SDA/SCL I2C bus, where I do a level shift between the CH201 lines in order to get the 1.8V level. My oscilloscope does confirm this working.
So again, my problem is there is no reponse from the CH201 chip. Any suggestions??
I tried to find a 'current' reference schematic for the CH201 here, couldn't, check out https://cdn.sparkfun.com/assets/4/9/1/9/3/Qwiic_Chirp_101.pdf