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MSPM0C1104: I2C issue .

seema Joshi
Prodigy 150 points

Part Number: MSPM0C1104

We are using 8 pin device,I2C interface with sensor 

Pin 2 is common for SCL/Reset.

We have connected R-C on the Reset pin as well as SCL pin pull up on sensor.

When we connect the MCU on the Launch pad code is working.

But when we power up the MCU from outside ,code found not working.

Please let us know how to take care for the SCL/Reset common pin hardware /software configuration.

 

 

Regards

Seema Joshi

 

  • 0
    TI__Mastermind 29955 points

    Hey Seema,

    I assume the RST/SCL pin is going high at power up?  How is the device not working?  

    For I2C applications on these small pin packages, I would completely drop the nRST resistor and only have the external pull-up for I2C.  The cap on nRST is mostly for noise filtering for unintended resets, but as your code will be disabling the nRST functionality early on, all that matters is the pin comes high at power-up so the MCU can boot. 

    Thanks,

    JD  

  • 0 in reply to JD Crutchfield
    Prodigy 150 points

    Sure! We have given power on delay   in the code , no issue observed after that.