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Anuraglokhande
Associate II
August 12, 2026
Question

STM32L496RGT6 UART sourcing current capacity

  • August 12, 2026
  • 2 replies
  • 30 views

Hi,

We have configured PB11 and PC4 for UART. when UART send data, what is pin current sourcing capacity?

/Anurag

 

 

2 replies

Andrew Neil
Andrew Neil
Super User
August 12, 2026

See the datasheet for the GPIO specifications - it’s not specific to what Alternate Function is used (eg, UART).

A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    G
    Gyessine
    ST Technical Moderator
    August 13, 2026

    Hello ​@Anuraglokhande 
    It is stated in the product datasheet Output driving current section that The GPIOs (general purpose input/outputs) can sink or source up to ±8 mA, and sink or source up to ± 20 mA (with a relaxed VOL/VOH). GPIOs PC13, PC14 and PC15 are supplied through the power switch, limiting source capability up to 3 mA only.
    You can review the datasheet for more details
    BR
    Gyessine

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