nRF52840 SPI and I2C pin mapping:

RE: nRF52840 SPI and I2C pin mapping:

Einar Thorsrud — Fri, 14 May 2021 12:23:11 GMT

Hi,

My answer was perhaps a bit too generic. There are some nRF52 family variants where there are differences between packages, but it does not apply to all. The point is to check the table for the variant and package you use, and then you are sure.

RE: nRF52840 SPI and I2C pin mapping:

Bima_zalan — Fri, 14 May 2021 11:02:01 GMT

Hi Einar,

Thanks for your quick answer, But are you sure that both the package QFN and WLCSP has different "Standard drive, low frequency I/O only" signals?

Bcoz i had already gone through it and found that both packages have same pins which mentions "Standard drive, low frequency I/O only" in Table 1 and Table 2 of pin assignments.

Asked this to just clear out that whether there is any package dependency or not.

Looking for your confirmation for the same.

RE: nRF52840 SPI and I2C pin mapping:

Einar Thorsrud — Fri, 14 May 2021 10:39:11 GMT

Hi,

Which pins are suited for high frequency or not depend not only on which IC you use, but also on the package. You can refer to the pin assignments table for the package you are using. Any pins marked with "low frequency I/O only" should not be used for SPI or TWI (or anything above ~ 10 kHz). The primary reason for this is that it can impact radio performance. This also means that if you know that you will not be using these pins while the radio is active there is no problem, with the exception of the NFC pins which have quite high capacitance also when configured as GPIOs, so they are never suitable for high frequency I/O.