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MSPM0C1104: Drive capacity of GPIO pins in SDIO config

Sathyadev K
Prodigy 30 points
Part Number: MSPM0C1104

Tool/software:

Can we drive a 2 mA LED using a SDIO pin, ie without using a transistor in the LED drive circuitry?

Datasheet 7.10.1 Electrical Characteristics mentions 6mA test condition for VCC > 2.7V 

The processor will have to drive maximum of three LED(s) using such GPIO(s).

Seen in the evaluation board schematic that PA22 pin of the MCU is directly driving a LED (part number: LTST-C190KRKT  ) 

  • 0
    TI__Mastermind 18397 points

    Please refer to datasheet 7.1 Absolute Maximum Ratings

    SDIO current at 2/6 mA will cause small voltage drop, this is depending on your requirements.

    Also, in nor MCU drive a LED, we can use a current limitation resistor to control current, value can be from 300Ohm to 10kOhm, this is also depending on your LED lightness requirements.

    Please don't allow the total MCU Vcc current to exceed the value specified in 7.1 Absolute Maximum Ratings, 48mA.

    for single MCU SDIO, keep current within 6mA.

    Such as if Vcc is 3.3V, a current limitation resistor above 550Ohm is OK.