on the nrf5340 DK i want to put the external flash into it lowest power state before i go to deep sleep

i have a custom board with the nrf5340 which uses the same external flash as the one on the nrf5340 DK board.  Before i put the processor into deep sleep with regulators off i want to know what i should do to the external flash to have it draw the minimum amount of power.

should I program the CS to off.  should i program the reset pin to put the part into reset?

should i send the chip a command to go to low power state ?

if so what should i set the CS and reset pins to ?

thanks

phil

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  • Hi

    A very similar question was asked in this DevZone ticket, where my colleague Dejan has a lengthy discussion with another user, so please give it a read and let me know if anything is unclear.

    In summary, the generic way forward would be to finish up any data transfers, uninit and power down the MX25 to a low power mode, and then set the CS pin to off to make sure it's off. Then you put the nRF5340 device into a low power mode by ending any other threads that might be running.

    Best regards,

    Simon

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  • Hi

    A very similar question was asked in this DevZone ticket, where my colleague Dejan has a lengthy discussion with another user, so please give it a read and let me know if anything is unclear.

    In summary, the generic way forward would be to finish up any data transfers, uninit and power down the MX25 to a low power mode, and then set the CS pin to off to make sure it's off. Then you put the nRF5340 device into a low power mode by ending any other threads that might be running.

    Best regards,

    Simon

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