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TM4C1231H6PM: TM4C Micro controller Drive strength for TPS22924C

Spandana Peramala
Prodigy 130 points
Part Number: TM4C1231H6PM
Other Parts Discussed in Thread: TPS22924C,

Hi Team,

We are using TM4C1231H6PM in our design. We are planning to enable 3 TPS22924C ICs with the single GPIO (Pin 6 with 8mA drive strength) from MCU. 

Kindly let us know if MCU is capable enough to drive 3 ICs with the single output pin!?

Appreciate your quick response.

Best regards,

Spandana Peramala.

  • 0
    Guru 117855 points

    Spandana Peramala said:
    Kindly let us know if MCU is capable enough to drive 3 ICs  (TPS22924C)  with the single output pin!?

    While 'unqualified' as (any) part of a 'team"  (other than 'mental health' seeking) - may I offer up the following?

    • Usually such answer resides in the 'current demand' - imposed by your external devices - upon the MCU's GPIO.
    • I located the 28 page device data manual - could find 'NO/ZERO' listing of the 'current demand' imposed by TPS22924C's  'ON' input.
    • There does appear a spec. for 'Ion' (ON state, Input Leakage Current - noted as 0.1µA) yet I'm unclear if that applies to the 'ON" input.   

    I was going to - prior to locating & reading the device's manual - suggest that,  'You RTFM' ... yet despite 6 pages of performance curves - no trace of 'Ion' - during normal 'ON' operating conditions - revealed!

    Follows the 'Recommended Operating Conditions' - where one (reasonably) expects such data to appear:

    'Some' inclusion of current - w/in the 'Vih' operating condition - (was) expected.    Other than the 0.1µA - 'ON State - input (leakage) current' - I've "come up dry."

  • 0
    TI__Guru*** 135355 points
    Hello Spandana,

    I agree with cb1, the MCU capability would need to be determined by understanding the maximum current draw that would be would be required for this.

    If the only pin controlled is the ON pin, then I would feel very confident it is possible to drive three of them at once, but without knowing max current draw for a single device we can't say for sure.

    I would anticipate the peak current for an enable line like ON to be fairly low though. You may want to clarify that with the power team to have full confidence.