Sharing the SPI bus if the nRF52840 is powered down

[Pauline Varley]

I'd like to share a SPI bus between the nRF52840 and another IC. The chips are on different load switches, though, and I'd need to communicate over the SPI bus with my other IC while the nRF52840 is fully powered down (VDD = VDDH = 0V). In the Absolute Maximum ratings, the I/O pin voltage is specified in reference to VDD, so I assume this configuration is not possible, but I wanted to check with a Nordic expert to be sure.

[Stian Røed Hafskjold]

Hi, you are right. You have to make sure that the GPIOs are not powered while the chip is off (VDD = 0V).