EasyDMA current consumption

RE: EasyDMA current consumption

Håkon Alseth — Thu, 03 May 2018 07:23:46 GMT

Hi Steve,

Does Nordic have any plans to update the spec for EasyDMA consumption on the nRF52832?

Unfortunately, this is not something I can comment on, as I do not know. I'd recommend that you contact our sales department for inquiries on future plans. Please send me a private message with your location if you do not have the contact details of your regional sales manager.

Does this consumption scale based on which peripheral or the peripheral mode/speed? For instance, I'd expect the DMA is less active servicing 400kHz I2C vs 8MHz SPI, but does the current scale at all?

The run-current for the specific peripheral will be added. In the case of TWIM and SPIM, they have both a added run-current of 50 uA (+ DMA current), but active current will also depend on the external connection as well (pull-resistors for I2C, load capacitance for SPIM). The base-current for the DMA is quite constant, regardless of which peripheral that uses it.

Best regards,

Håkon

Best regards,

Håkon

RE: EasyDMA current consumption

Steve — Wed, 02 May 2018 13:56:19 GMT

Thanks Hakon,

Does this consumption scale based on which peripheral or the peripheral mode/speed? For instance, I'd expect the DMA is less active servicing 400kHz I2C vs 8MHz SPI, but does the current scale at all?

Does Nordic have any plans to update the spec for EasyDMA consumption on the nRF52832? Ideally this is broken out or spec'd for each possible peripheral. For instance, I don't really care about the use with SAADC, just TWI and SPI.

Thanks,

Steve

RE: EasyDMA current consumption

Håkon Alseth — Wed, 02 May 2018 12:01:26 GMT

Hi Steve,

You are correct, the DMA logic itself draws approx. 1.2 mA, as per this thread.

Unfortunately, this is not specified in the nRF52832 PS.

It is however specified indirectly for the nRF52810 SAADC El.spec and the nRF52840 SAADC El.spec.

Kind regards,

Håkon