High current consumption during IDLE mode

[Idan]

Hello there,

I'm currently using nrf52832 with s132 and sdk 0.9.2, based on the 'ble_app_uart' example and keil5. I'm concerned about the current consumption because in IDLE mode I should expect very low current consumption(~2.5[ua]) while reading 21[ua].

when I blackened all unnecessary functions in my main function. I'm using 'sd_power_system_off()' to get into SYSTEM_OFF mode, and the reading was 4.7[ua](instead of ~1.4[ua]). I checked this erata concerning HFCLK but there it's written that it's about higher current consumption (>100[ua]). what might increase the current consumption?

[Øyvind Karlsen]

Hi,

First off this will depend on what measuring equipment you have available and which version of the development kit (I am assuming that is what you are using) you are using. The introduction to current measurement describes this well. Which version of the SoftDevice you are using will also matter.

I've experienced something very much like what you are describing, please see my somewhat dated answer here.

For additional information you can also have a look at:

• Current measurement guide: Measuring current with nRF52832 Engineering B and S132 v2.0.0-7.alpha

• Current measurement guide: Measuring current with PCA10040 v0.9.0

Hopefully this answers your question, best regards,

Øyvind

[Idan]

Hi there Øyvind,

I measure current via 'SANWA' Digital Multimeter CD771, description.

[Øyvind Karlsen]

According to the datasheet for your multimeter, it is only rated for measurements down to 400µA, this is not enough to measure this type of current.