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GPIO Current Specifications

wjohns2574

Hello,

I have a question about the nRF52840 device and the supporting documentation. I am trying to figure out the current ratings for the GPIO. On page 198 it states that typical current is 9mA and the max is 14mA. This seems awfully low. What is confusing is that in the next few pages, Figure 25, 26 and 27 show that the max drive/sink current is around 25mA.

I guess what I am trying to figure out is what's the max current allowed? I'm glad I decided to check this, I was about to try to drive a LED between 20 and 30mA.

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    The curves are still missing in the NRF52840 specs, but these should be very similar to those in the nrf52832 GPIO spec.

    These curves show short circuit currents in the 25-30mA range with 3V VDD. The NRF chip should survive on or two completely shorted GPIOs - unless you use the 50mA VDDH regulator.

    I don't think you can drive an LED with more than 20mA, as the voltage drop across the pin becomes too big. BTW: Modern LEDs are VERY bright at 20mA.

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    The curves are still missing in the NRF52840 specs, but these should be very similar to those in the nrf52832 GPIO spec.

    These curves show short circuit currents in the 25-30mA range with 3V VDD. The NRF chip should survive on or two completely shorted GPIOs - unless you use the 50mA VDDH regulator.

    I don't think you can drive an LED with more than 20mA, as the voltage drop across the pin becomes too big. BTW: Modern LEDs are VERY bright at 20mA.

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