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Low power with peripherals, I2C and SPI in nrf52

JoseSecmotic2

Hi everybody, We are using a custom board based in nrf52832, BLE and a custom antenna, and we are finding some issues trying to use the device in low power mode. We are using I2C and SPI communications and we have the following set of sensors:

Accelerometer gyroscope and magnetometer (BMX055 from Bosch: datasheet) Ultraviolet sensor (SI1133 datasheet ) Gas gauge / battery monitor datasheet

We have tried putting the sensors in their low power mode, and our objective is having a mean current consumption of 500uA.

We are using the softdevice s132 with the SDK v13 and even trying to use System OFF / System ON to minimize the consumption. Using this we have achieved 1uA / 100uA in the development board, but the minimum current we have achieved in our custom board is of 5mA (non acceptable) We have discarded a hardware problem Here is our very basic code, where we have achieved the minimum power in the custom board. Any help would be appreciated!

main.c

Thanks in advance

Edit:

We have done the following:

  • Put the UV sensor in deep suspend mode. Now the system consumes 2mA~
  • We have tried to use SystemOFF instead of SystemON and the result is that the system consumes about 1,6~mA, (-300 - 400 uA), so it makes sense that the CPU is running correctly. What else could it be?
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    Hello again Martin, and thanks for the answer. 1- We have tested the ble_app_template and we are measuring 6mA~ (without touching the parts where YOUR_JOB appears).

    2- You are right. Nevertheless we have 10 samples and it appears to happen the same in each one of them.

    3- Correct. If we don't configure them in low power mode, for example the gyroscope will draw about 4 mA by its own, so we initialize them in low power mode and then we don't use them.

    4- We don't have the PPK neither an oscilloscope, so I'm afraid this would be not possible by the moment. We are using a multimeter to measure the current

    5- We are not sending anything by the moment to find out what is the issue

    6 -I will now create the case and upload the files.

    Thanks a lot!

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  • 0

    Hello again Martin, and thanks for the answer. 1- We have tested the ble_app_template and we are measuring 6mA~ (without touching the parts where YOUR_JOB appears).

    2- You are right. Nevertheless we have 10 samples and it appears to happen the same in each one of them.

    3- Correct. If we don't configure them in low power mode, for example the gyroscope will draw about 4 mA by its own, so we initialize them in low power mode and then we don't use them.

    4- We don't have the PPK neither an oscilloscope, so I'm afraid this would be not possible by the moment. We are using a multimeter to measure the current

    5- We are not sending anything by the moment to find out what is the issue

    6 -I will now create the case and upload the files.

    Thanks a lot!

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