RE: Putting External Flash to deep sleep (MX66L1G45G)

SJahnke — Thu, 24 Apr 2025 07:55:49 GMT

Is this also possible for external memory MX25R64 on nRF54L15.

What needs to be done to bring this one on SPI Interface into deep sleep? Can just find information for qspi on nRF5340 and nRf52840. Is there already a description how to do this on nRF54L15?

Thanks

RE: Putting External Flash to deep sleep (MX66L1G45G)

Kenneth — Thu, 11 Apr 2024 18:58:41 GMT

Hello,

If you use the compatible = "nordic,qspi-nor"; driver, for instance just search for various boards that use it as reference, then to enter and exit deep sleep mode you can use the power management api to enter and exit deep sleep mode. See example here:

https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/test_and_optimize/optimizing/power_general.html#put-the-external-flash-into-sleep-mode-in-inactivity-periods

This will ensure the following commands are executed to enter and exit deep sleep:

#define SPI_NOR_CMD_DPD 0xB9 /* Deep Power Down */
#define SPI_NOR_CMD_RDPD 0xAB /* Release from Deep Power Down */

Kenneth