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TMS320F280049C: If COMPH and COMPL in a same CMPSS module could work as two separately comparator parts?

Rayna Wang
Expert 3680 points
Part Number: TMS320F280049C

Hi Expert,

I'd like to make sure that if COMPH and COMPL in a same CMPSS module could work as two separately comparator parts, in other word, if the CMPx_HP and CMPx_LP could connect different signals at the same time?

However, in F280049 TRM, it seems CMPx_HP, CMPx_HN, CMPx_LP, CMPx_LN are connect with a same pin. 

Could you help to comment this? Thanks!

  • 0
    TI__Mastermind 28275 points

    Hi Rayna,

    Yes, COMPH and COMPL in the same CMPSS module can be used independently on F28004x. They aren't connected to the same pin. Below snapshot shows the 4 pins COMPH and COMPL of CMPSS1 can connect to.

  • 0
    TI__Guru 62975 points

    Rayna,

    Also keep in mind that there can be some cross-disturbance in the DAC output voltages when a comparator trips:

    -Tommy

  • 0 in reply to tlee
    TI__Expert 3680 points

    Hi Tommy,

    Do you mean that "CMPSS DAC output" is connected with negative input of the comparator, when trip occurs or DAC value changes, the negative reference voltage value will be disturbance in -100 to 100LSB range?

    Best Regards

    Rayna

  • 0 in reply to Rayna Wang
    TI__Mastermind 28275 points

    Rayne,

    That is correct. COMPDACH and COMPDACL share some components so a trip or change on one will induce disturbance on the other. This means if COMPH trips or COMPDACH's value is changed, it will temporarily disturb COMPDACL's output for a max time of 200ns with max magnitude of -/+100LSBs.