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TMS570LS0432: TMS570 Connections

Alex Terry
Intellectual 625 points
Part Number: TMS570LS0432
Other Parts Discussed in Thread: BQ76PL455A-Q1,

Hi,

I'm currently designing a BMS using the BQ76pl455A-Q1 and TMS570LS0432 MCU, as this microcontroller has a lot of functionality that I wont need, should unused pins (such as all ADIN, all N2HET, all but 2 GIO, all SPI and various other connections) be connected to the ground reference or left floating?

Thanks in advance,

Alex

  • 0
    TI__Guru**** 197936 points
    Hello Alex,

    You can leave those pins unconnected, configure those pins as input with internal or external pull-up or pull-down.
    Leaving the unused pins floating (set them as input) without any internal or external pulls (up or down) will introduce more input noise, increase the EMI and power consumption.
    Connecting the unused pins (set as input) to GND is a good solution for EMI, and make the PCB layout easier, but those pins are not available for future use in case more features are required later.