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MSP430FR2522: slave i2c sw simultion on GPIO

Intellectual 2070 points
Terry Deng

Replies: 3

Views: 124

Part Number: MSP430FR2522

customer need slave i2c on fr2522 to communicate with host mcu，but the hardware i2c pin is occupied by captive function，do we have reference code to simulte sw slave i2c on general gpio？

Intellectual 2070 points
Terry Deng
  • Expert 5460 points
    Yiding Luo
    Hello Terry,

    They can remap the I2C function to other pins on the MSP430FR2522 20 pin RHL package.
    The primary eUSCI_B0 I2C pins are Pin 19 and Pin 20 which are also shared with CAP IOs. The secondary eUSCI_B0 I2C pins are Pin 9 and Pin 10 which are not shared with CAP IOs.

    Thanks,
    Yiding

  • Intellectual 2070 points
    Terry Deng

    In reply to Yiding Luo:

    hi yiding，thanks your advice. customer cannot accept 20pin QFN package，so we have to consider sw i2c on 16pin package
  • Expert 5460 points
    Yiding Luo

    In reply to Terry Deng:

    Hello Terry,

    Here is the app note on MSP430 SW I2C.
    www.ti.com/lit/slaa703
    This software solution supports transactions on I2C bus with an SCL clock frequency of up to 100 kHz for master and slave.
    I would still recommend to use 20pin QFN package if possible.

    Thanks,
    Yiding

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