nRF5340 QSPI Compatibility

[nickyblanch]

Hi all,

My team and I are developing a product based on the nRF5340 that requires a 4-channel ADC. This ADC supports serial 4 wire mode for data output - the description is here (page 22) for anyone curious. The nRF5340 datasheet does talk about the QSPI peripheral, but only in the context of external flash memory. Therefore, my questions are:

2.) Can the nRF5340 QSPI peripheral be used for an ADC? Or is it only intended for use with flash memory?

3.) Any tips on getting the highest data throughput from the ADC via standard (single) SPI if QSPI is not available?

Any and all insight is appreciated. Thank you in advance!

Best,

Nick B

[AHaug]

Hi,

2.) Can the nRF5340 QSPI peripheral be used for an ADC? Or is it only intended for use with flash memory?

Unfortunately you can't use the QSPI peripheral for that purpose, as its specifically intended for NOR flash and the hardware uses the standardized NOR Flash instructions right after activation. If you want to use the Custom Instructions of the QSPI it only supports single serial 1-wire mode

3.) Any tips on getting the highest data throughput from the ADC via standard (single) SPI if QSPI is not available?

The fastest standard SPI master on the nRF5340 is instance SPIM4

Let me know if this answers your questions

Kind regards,
Andreas