the min current in nrf5340 ncs sdk

[pipixia_1_1]

I am using the nRF5340 development board to program the LBS example from the NCS SDK2.7. After system-off, the current is still several tens of microamps, which differs from the expected current of around 1 µA. What is the example with the lowest power consumption that supports Bluetooth functionality in the NCS SDK for the nRF5340, and what is the expected current of the development board after system-off

[tesc]

Hi,

Please note that when the DK is connected to a PC and in Debug Interface mode, the SoC is in Emulated System OFF mode, where a number of resources of the SoC are still enabled and available for debugging. For details, please see the Emulated System OFF mode section of the Power and clock management documentation page.

Typical current consumption by the nRF5340 when in actual System OFF mode depend on wake up source, retained RAM, temperature, etc. It would typically be at around 1 uA at room temperature, but higher at higher temperatures. For specific numbers (including graphs of current consumption v.s. temperature), please refer the Current consumption section of the nRF5340 Product Specification.

Please also make sure you are measuring current consumption of the nRF only, and not by the full board with both interface MCU (also an nRF5340, but running segger software for acting as debugger) as well as LEDs and possibly other components.

Regards,
Terje

[pipixia_1_1]

I am using the peripheral_lbs and peripheral_power_profiling examples. The test is conducted at room temperature using a PPK2, with no J-Link connected. On the nRF5340 DK, SB40 is cut. The PPK2 is used in Source Meter mode. PPK2 VOUT is connected to the nRF side of P22, and GND is connected to DK GND.

• SW8: ON

• SW9: VDD

• SW10: ON

• SW6: nRF ONLY

The measured power consumption after system-off is 200–300 µA. Interestingly, when testing, I measured the voltage at P23 and found it to be 3.3V.

[Kenneth]

Can you send a picture of your hardware setup? I assume it's close to this:
https://docs.nordicsemi.com/r/bundle/ug_ppk2/page/ug/ppk/measure_current_source_meter.html 

Are you using 3V?

Kenneth

[pipixia_1_1]

[Kenneth]

You still need to plug in the USB cable, else you will have leakage through level shifters and the interface MCU that is used for debugging/programming.

Kenneth