Current consumption of nrf52840

[shakingwindow]

What is the current consumption of the nrf52840-dk when the CPU is in sleep mode while active peripherals such as SPIM, I2C, and DMA are running?

Is there any information available on this topic in the product specification at https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52840%2Fchapters%2Fcurrent_consumption%2Fdoc%2Ffrontpage.html&cp=5_0_0_4_1?

[Simonr]

Hi

The current consumption of most of the peripherals, SPIM, I2C, etc. are all very similar and the current consumption of them are added in the nRF52832 PS, not the nRF52840 for the time being unfortunately. But the nRF52832 numbers should be comparable to the nRF52840.

• SPIM
• TWIM
• TWIS

As for the DMA logic, it draws ~1.2mA, as explained in this thread. It's strongly recommended to disable the peripherals when there are no ongoing transmissions and enabling them again when the nRF52840 wakes up to do further operations.

Best regards,

Simon

[shakingwindow]

Thank you for your response. According to the datasheet, the SPIM is stated to consume 50 microamps of current. Does this take into account the use of DMA as well or would the consumption be significantly higher, at approximately 1.2 milliamps + 50uA, when utilizing SPIM?" ( SPIM interface makes use of EasyDMA)

[Simonr]

When using the SPIM the current consumption will indeed be 50µA + the 1.2mA that is required by the EasyDMA. But the increased throughput of a high speed SPIM makes up for it in not having to be on for very long to transfer a lot of data.

Best regards,
Simon