SLAA249B April   2005  – September 2018 MSP430F169 , MSP430F169 , MSP430F5252 , MSP430F5252 , MSP430F5253 , MSP430F5253 , MSP430F5254 , MSP430F5254 , MSP430F5255 , MSP430F5255 , MSP430F5256 , MSP430F5256 , MSP430F5257 , MSP430F5257 , MSP430F5258 , MSP430F5258 , MSP430F5259 , MSP430F5259

 

  1.   Implementing SMBus Using MSP430™ Hardware I2C
    1.     Trademarks
    2. 1 Introduction
    3. 2 SMBus Protocols
    4. 3 Software
    5. 4 Example Code
      1. 4.1 Example 1
        1.       fet140_SMB_mstr.c(.s43)
        2.       fet140_SMB_slav.c(.s43)
      2. 4.2 Example 2
        1.       fet140_SMB_mstr_slvrst.c(.s43)
        2.       fet140_SMB_slav_slvrst.c(.s43)
      3. 4.3 Example 3
        1.       fet140_SMB_mstr_PEC.c
        2.       fet140_SMB_slave_PEC.c
      4. 4.4 Example 4
        1.       fet140_SMB_tmp175.c
    6. 5 SMBus Using the USCI I2C Peripheral
      1. 5.1 Example 1a: Timeout Implementation for Master/Slave on a MSP430F2xx Device
        1.       msp430x26x_SMB_MST_timeout.c
        2.       msp430x26x_SMB_SLV_timeout.c
      2. 5.2 Example 1b: Timeout Implementation for Master/Slave on a MSP430F5xx Device
        1.       msp430x5xx_SMB_MST_timeout.c
        2.       msp430x5xx_SMB_SLV_timeout.c
      3. 5.3 Example 2: Implementation of CRC-8 PEC
        1.       msp430x26x_SMB_mstr_PEC.c
        2.       msp430x26x_SMB_slave_PEC.c
      4. 5.4 Example 3: Implementation With SMBUS Slave TMP175
        1.       msp430x26x_SMB_tmp175.c
    7. 6 Conclusion
    8. 7 References
  2.   Revision History

5 SMBus Using the USCI I2C Peripheral

This application report has been expanded for SMBus implementation using the newer USCI I2C module on the latest 2xx, 4xx, and 5xx families of devices. This module provides automatic clock activation for use with low-power modes when the module needs the clock for an I2C transaction. See the appropriate device data sheets and family user's guides for more details.

The tests on example 1 through 3 were performed using a MSP430F2619 and TI target board (MSP-TS430PM64). See the MSP430 Hardware Tools User's Guide for a schematic of the board.

The following codes (available from http://www.ti.com/lit/zip/slaa249) are used to test this implementation and the newer features and code enhancements are highlighted in each example mentioned below (as applicable).