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TMS320F28055: Question on phase current voltage output pins.

Akila Sadhasivan
Expert 1200 points
Part Number: TMS320F28055
Other Parts Discussed in Thread: MOTORWARE

In the document named, TMDSHVMTRKIT5X_HWGuide.pdf, in Table 2: PWM and ADC resource allocation,

it is shown as below. I am trying to understand this. Are pins 13, 67, 63 used for Ifb-U, Ifb-V, and Ifb-W respectively? What does A1, B1, A5 mean?

Ifb-U

ADC-B3, A1

Low side U-phase current sense

Ifb-V

ADC-B5, B1

Low side V-phase current sense

Ifb-W

ADC-A3, A5

Low side W-phase current sense

  • 0
    TI__Guru** 109730 points
    Both ADC pins are connected to the same phase current. For example, you could use either one, B3 or A1 for U phase current, other two phases are the same. Or you could use A1 for U-phase and B1 for V-phase to achieve simultaneous sampling in a vector sector since F28055 has two sample/hold modules, and then switch to B3 for U-phase and A3 for W-phase, the same for B5 and A5. You might select any one of two ADC pins for each phase if you don't need the simultaneous sampling function.
  • 0 in reply to Yanming Luo
    Expert 1200 points
    I assume that the Motorware software in TMDSHVMTRKIT5X kit uses simultaneous sampling. Please correct me if I am wrong.
  • 0 in reply to Akila Sadhasivan
    TI__Guru** 109730 points
    Not used simultaneous sampling in motorWare, it is only used for some cases that need critical sampling time on current sensing.
  • 0 in reply to Yanming Luo
    Expert 1200 points
    In that case, can we use the pins A1, B1, and A3 for current sensing, and use the rest of the pins B3, B5, and A5 for some other sensing? What code change should I make to HAL to get this routed this way. Can you give me some guidance? Thanks.
    Akila
  • 0 in reply to Akila Sadhasivan
    TI__Guru** 109730 points
    You might use either one of the two channels for phase current, that can be configured in HAL_setupAdcs() in hal.c. You could use the rest one for some other sensing on the board you designed, but you can't use these rest channels for some other sensing since the two channels (B3/A1, B5/B1, or A3/A5) of the controller are physically connected together to the same phase current on TMDSHVMTRKIT5X kit through DIM-100 connector.