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TCAN1057A-Q1: Control Silent mode by MCU GPIO

Tao_2199
Genius 5770 points
Part Number: TCAN1057A-Q1

Hello,
My customer is asking about Silent Mode pin.
They will control it directly by MCU GPIO but according to datasheet, pull-up/down is needed for operation.


Also according to E2E thread about pull-down, it may also be grounded directly if this extra current is acceptable to reduce BOM count.
https://e2e.ti.com/support/interface-group/interface/f/interface-forum/1040596/tcan1057a-q1-silent-mode-pin-to-gnd?tisearch=e2e-sitesearch&keymatch=TCAN1057A-Q1%25252520silent#

For MCU control, can we directly tie this pin to GPIO ?
If pull-up/down is needed, what would be a typical resistor value for this pull-up/down (using 2kOhm currently)?

Regards,

Tao_2199 

  • 0
    TI__Guru 74282 points

    Tao_2199,

    If the MCU is controlling this pin, it is okay to not use a pull-up/pull-down resistor. However, having a pull-up/pull-down resistor will ensure a known state in case the MCU leaves the Silent mode pin floating due to fault case, or for any other reason. 

    Please let us know if you have any other questions.

    Regards,

    Eric Hackett