Hello,
I have a prototype board with UCD9222 PMBus connected to a MSP4305438A uC.
I'm trying to use the I2C bus of the uC to configure the UCD9222 device.
My PMBus program is based on the code example from SLAA386A: "PMBus Implementation Using the MSP430 USCI" document only modified it for the MSP430F5438A uC.
So far the uC is not able to communicate with the device, the program is stuck in NACK/wait for stop state.
On the I2C SDA and CLK lines I see only start condition followed by the first 8 bits of the device address but no stop condition or ACK afterwords. Clock is 100KHz and the design is similar to C6678 EVM.
Any suggestions?
Thank you,
Ronen