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TMS320F280025C: ABOUT pmbus pins

serena he
Prodigy 80 points
Part Number: TMS320F280025C


Now we use TMS320F280025C to build our new power project, and need to use PMBus to communicate with other devices .

but we didn't know what PMBus is ?

about the the 4 pin : ALERT, CTL, SCL, SDA, 

for the master mode : when F280025C chip sends byte to slave , how are the ALERT or CTL working ?  when slave device send byte to F280025C chip , how are the  ALERT or CTL working ?

and for the slave mode: when F280025 chip sends byte to master device, how is the ALERT or CTL working ?  when master device send byte to F280025C chip , how are the  ALERT or CTL working ?

please kindly give us advices , thank you !

  • 0
    TI__Guru 55700 points

    Serena,

    PMBus pin description:

    ALERT              -   This pin will be used by slave device to request attention from master

    CONTROL        -   This pin will be used by master device to tell slave device to shutdown

    SCL                   -   Clock pin

    SDA                   -   Data pin

    When PMBus is Master, ALERT pin is input pin and CONTROL pin is output pin

    When PMBus is Slave, ALERT pin is output pin and CONTROL pin is input pin

    Whats All This PMBus Stuff About, Anyhow?

    Regards,

    Manoj

  • 0 in reply to Manoj Santha Mohan
    Prodigy 80 points

    Hello Manoj, 

    Thanks for your kindly response.

    we can't open youtube webpage in China . and do you have other solution to show me this useful PMBus video ?

    Now our project will use PMBus Slave -> Master mode . 

    and about setting GPIO for CONTROL pin and ALERT pin , there are same function to set them same both for Slave or Master Mode , 

     GPIO_setPinConfig(GPIO_12_PMBUSA_CTL);           //SlaveMode下，CTL为输入

     GPIO_setPinConfig(GPIO_13_PMBUSA_ALERT);       //SlaveMode下，ALERT为输出

    is it enough just use this Pin setting function for PMBUSA_CTL or PMBUSA_ALERT ?

    thank you 

    Serena

  • 0 in reply to serena he
    TI__Guru 55700 points

    Serena,

    Please check this training videos related to PMBus - https://training.ti.com/how-power-your-pmbus

    serena he said:

    about setting GPIO for CONTROL pin and ALERT pin , there are same function to set them same both for Slave or Master Mode , 

     GPIO_setPinConfig(GPIO_12_PMBUSA_CTL);           //SlaveMode下，CTL为输入

     GPIO_setPinConfig(GPIO_13_PMBUSA_ALERT);       //SlaveMode下，ALERT为输出

    is it enough just use this Pin setting function for PMBUSA_CTL or PMBUSA_ALERT ?

    Yes, CTL and ALERT pin settings are same with respect to master / slave.

    Regards,

    Manoj