qspi flash drawing high current in dpd mode.

RE: qspi flash drawing high current in dpd mode.

Simonr — Wed, 02 Jul 2025 12:53:13 GMT

Please check out this ticket on entering dpd mode that covers multiple reasons as to why you might not be able to enter dpd mode correctly.

Best regards,

Simon

RE: qspi flash drawing high current in dpd mode.

meraki — Tue, 01 Jul 2025 07:58:26 GMT

Using the SDK v2.9.0
I'm facing an issue putting the flash in dpd mode, not when getting out. Current consumption by flash is way higher than it is supposed to be in dpd mode, around 800-900uA.

RE: qspi flash drawing high current in dpd mode.

Simonr — Tue, 01 Jul 2025 07:45:20 GMT

What SDK version are you using for developing here?

In order to wake up from DPD with QSPI, some external flash devices are sometimes able to wake up from DPD mode to standby when the CS line is pulled low (the CS line is under control of the peripheral though). Most SPI devices are put to sleep and woken up by a SW command, so the thing that sends the command (QSPI peripheral) should not be uninitialized.

I think a better way to achieve low power here is to power down/shut off the external flash entirely instead of going into DPD mode, then uninitializing the peripheral and putting the nRF5340 into system OFF mode, then wake it up with an external event and start the external flash chip with the QSPI init function.

You can alternatively check ut this fix for DPD exits for devices that ignore non-dpd commands while sleeping. https://github.com/zephyrproject-rtos/zephyr/pull/64782

Best regards,

Simon