SPIM current consumption is large

RE: SPIM current consumption is large

Jared — Tue, 12 Mar 2024 10:45:25 GMT

I see, well 1.6 mA is about the expected current when you run SPIM as the EasyDMA current itself is around 1 - 1.2 mA.

I think what you measure seems reasonable. To save power you need to disable the SPIM and go IDLE sleep after you've done with transaction.

regards

Jared

RE: SPIM current consumption is large

talby — Tue, 12 Mar 2024 06:06:55 GMT

Thank you for your reply.

No, Logging is disabled.

Sorry, we cannot release the source code.

Thank you for your cooperation.

best regards.

RE: SPIM current consumption is large

Jared — Mon, 11 Mar 2024 12:17:45 GMT

Hi,

Do you have logging enabled? Could you show me your code?

When you enable the SPIM you will have EasyDMA current + HFCLOCK will also be active during the transaction.

regards

Jared

RE: SPIM current consumption is large

talby — Mon, 11 Mar 2024 02:24:06 GMT

Thank you for your reply.

I am measuring by inserting an ammeter into the 3.3V power line.

With the same H/W, BLE advertising has the expected waveform. (attached)

I am using DC/DC. When DC/DC is turned off, the current increases.

Soft devices are valid for devices other than SPIM.

app_timer.c is also valid.

However, when not using SPI, it is less than 4uA, which is as expected.

I am using nrf_drv_spi.c as is.

best regards!

RE: SPIM current consumption is large

Jared — Fri, 08 Mar 2024 12:28:57 GMT

Hi,

Average run current should be around 1µA. Are you only using the SPIM peripheral? How are you measuring the current? Did you remember to enable the DC/DC?

[quote user=""]Is it possible to improve it?[/quote]

If you want to get better average current then it would be smart to increase the frequency that the SPIM runs at, so that you quicker finish the transmission of data and can go to sleep longer,

regards

Jared