High Current Consumption in nRF5340 in sleep mode

Hi all,

We are working on a project that uses the nRF5340 and nRF7002 combo. In our application, the device enters a low-power mode on the nRF5340 during sleep, with the nRF7002 turned off.

We followed the low-power example code, but we're seeing a high current draw of 3 mA on the nRF5340 alone on our custom board. When we tested the same example on the nRF7002 DK and measured the current at P22, we observed only 14 µA.

Our custom board design follows the nRF7002 DK as reference and we've even removed extra pull-ups and pull-downs, but the current remains the same. Interestingly, when we run the example SYSTEM OFF mode code on the same custom board, we observe a current draw of 5 µA by nRF5340, whereas the DK consumes only 1 µA. This difference can be accepted due to some design/parts.

The main difference between the DK and our design is the operating voltage: the DK uses 1.8V, while our custom board uses 3.3V. While some variation due to this voltage difference is expected, a 3 mA difference seems excessive.

  • Are there any code changes needed for the 3.3V voltage rail?
  • What are the other steps can be taken from our side to reduce the sleep current?

Thanks,

Jagan K

Parents Reply
  • Hi Håkon, 

    Thank you. Let’s focus on the BLE part itself.What would be the current consumption in this scenario ?

    Suppose, two nRF5340 devices are used—one as a gateway and the other as a sensor.  The sensor will communicate with the gateway via BLE, similar to a smart home application. Are there any example projects available for testing this setup?

    Regards,
    Jagan K
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