NRF52840 sleep current to hish after SPI transfer

RE: NRF52840 sleep current to hish after SPI transfer

Kenneth — Mon, 09 Dec 2019 08:43:21 GMT

This chip markings are good.

Even 45/65uA is a high value, is the current you measure average current or do you have a power profiler kit so you can see transitions and spikes that add up to the 45/65/665uA.

Can it be any floating gpios and/or current drawn through pull up/down resistors? Are you using IN event with GPIOTE or PORT event? Look for high accuracy bit when configure gpiote, use false for lowest current (GPIOTE event).

RE: NRF52840 sleep current to hish after SPI transfer

Falaroce — Sat, 07 Dec 2019 21:16:25 GMT

Hello Kenneth,

Thanks you for your reply.

-Marking is N52840 QIAAD0 1925AP

- I measured the current without the SPI ans TWI slaves connected and power goes down to 45µA
- I do not use UART for debugging ( it is not enabled )

Regards,

RE: NRF52840 sleep current to hish after SPI transfer

Kenneth — Mon, 02 Dec 2019 14:52:43 GMT

Hi,

Seems HFCLK is running, your "procedure" to power down SPI/TWI seems to be pretty "bullet proof".

- What is the ic markings on the top of the nRF52840?
- Have you tried to repeat measurement on nRF52840-DK (and/or without anything connected to the TWI/SPI pins)?
- Can it be related to the UART (debugging)?

Best regards,
Kenneth