nRF52840 GPIO Drive Strength; how to interprete "Standard drive, low frequency I/O only"

RE: nRF52840 GPIO Drive Strength; how to interprete "Standard drive, low frequency I/O only"

Simonr — Mon, 17 Jun 2024 12:17:50 GMT

Hi Ron

This is mentioned in the note on page 580 on nRF52840 PS. https://infocenter.nordicsemi.com/pdf/nRF52840_PS_v1.8.pdf

"Note: For more information on standard drive, see GPIO — General purpose input/output on page 151. Low frequency I/O is a signal with a frequency up to 10 kHz."

Best regards,

Simon

RE: nRF52840 GPIO Drive Strength; how to interprete "Standard drive, low frequency I/O only"

Ron — Fri, 14 Jun 2024 12:58:45 GMT

Is it recommended to use them for i2c? at what max Freq?

Thanks!

Ron

RE: nRF52840 GPIO Drive Strength; how to interprete "Standard drive, low frequency I/O only"

Simonr — Fri, 05 Jul 2019 08:11:30 GMT

"Standard drive, low frequency I/O only" is the tag of the pins that are close to the radio on the nRF52 series chips, and has this tag as they may interfere with the radio if they're set to use anything other than standard drive or low frequency while the radio is running. So if you're planning to use the radio at the same time as the LEDs are running and configured in for example high drive, I suggest you do not use these pins for that purpose.

Best regards,

Simon