QSPI Flash power consumption

RE: QSPI Flash power consumption

Jared — Thu, 23 Feb 2023 09:20:57 GMT

Hi,

That should be correct,

[quote user="Kerko"]Also regarding my last question in my last message, is there a way to enable/disable a peripheral on the fly with nRF Connect SDK?[/quote]

You can try to use the power management api and set the QSPI device into a low power state as explained here. Call pm_device_state_set() with PM_DEVICE_STATE_SUSPENDED when done using the peripheral and PM_DEVICE_STATE_ACTIVE before you start using it.

regards
Jared

RE: QSPI Flash power consumption

kerko — Thu, 23 Feb 2023 02:55:36 GMT

Hi Jared,

Thanks for your reply.

I think the deep power mode is activated by the parameters given in the peripheral configuration through overlay files.
We are using "has-dpd" parameter and enter/exit timing parameters.

By the way, I updated our custom firmware to use SPI to communicate to MX66 flash (rather than QSPI) and power consumption reduced significantly.

The two configurations for QSPI and SPI usage are below:

&qspi {

status = "okay";

sck-pin = <17>;

io-pins = <13>, <14>, <15>, <16>;

csn-pins = <18>;

// mx66l1g: mx66l1g45g@0 {

mx25r64: mx25r6435f@0 {

compatible = "nordic,qspi-nor";

reg = <0>;

// MX66L1G supports only pp and pp4io

writeoc = "pp4io";

// MX66L1G supports all readoc options

readoc = "read4io";

sck-frequency = <8000000>;

label = "MX66L1G";

jedec-id = [c2 20 1b];

sfdp-bfp = [

e5 20 fb ff ff ff ff f3 44 eb 08 6b 08 3b 04 bb

fe ff ff ff ff ff 00 ff ff ff 44 eb 0c 20 0f 52

10 d8 00 ff 23 72 f5 00 82 ed 04 cc 44 83 68 44

30 b0 30 b0 f7 c4 d5 5c 00 be 29 ff f0 d0 ff ff

];

size = <1073741824>;

has-dpd;

t-enter-dpd = <10000>;

t-exit-dpd = <35000>;

};

&spi3 {

status = "okay";

sck-pin = <17>;

mosi-pin = <13>;

miso-pin = <14>;

cs-gpios = <&gpio0 18 GPIO_ACTIVE_LOW>;

mx66l1g: mx66l1g45g@0 {

compatible = "jedec,spi-nor";

reg = <0>;

spi-max-frequency = <8000000>;

label = "MX66L1G";

jedec-id = [c2 20 1b];

sfdp-bfp = [

e5 20 fb ff ff ff ff f3 44 eb 08 6b 08 3b 04 bb

fe ff ff ff ff ff 00 ff ff ff 44 eb 0c 20 0f 52

10 d8 00 ff 23 72 f5 00 82 ed 04 cc 44 83 68 44

30 b0 30 b0 f7 c4 d5 5c 00 be 29 ff f0 d0 ff ff

];

size = <1073741824>;

has-dpd;

t-enter-dpd = <10000>;

t-exit-dpd = <35000>;

};

Is there anything else I need to do to get the flash into DPD mode when not used?

Also regarding my last question in my last message, is there a way to enable/disable a peripheral on the fly with nRF Connect SDK?

RE: QSPI Flash power consumption

Jared — Tue, 21 Feb 2023 11:25:32 GMT

Hi,

[quote user=""]4^th measurement: SB18 shorted (flash power consumption included). Power optimisation in prj.conf as below. Measured current is 10.31mA at 3V[/quote]

If you short SB18 and SB16 is already shorted then you risk powering the whole DK from VDD_NRF, thus increasing the current consumption.

It's expected that external flash will consume a lot of current when it's active. Most flash support a low power mode and it's activated by writing to it via the QSPI peripheral. Are you doing this in your application?

regards

Jared