The current peak of 334uA during system on Low power mode

[Surya]

I observed a peak of 334 ua during system-on low-power mode during idle time which is periodic around 4 sec. I am using ble with RC clock option.

1.is it waking for calibration of the clock source?

2.how much current will be drawn for calibration of the clock?

3.how to stop calibration for a time period where ble is not used?

[Simonr]

Hi

As Turbo J says, the LF XTAL will reduce the overall current consumption significantly to any of the other LF clock options. You can check out the Online Power Profiler for BLE to see the differences between idle currents in a variety of configurations.

If you set the device to "system OFF" mode, the LF clock won't have to run, and the current consumption will be more similar for both instances, but in system ON mode an LF clock will be running, and if using the RC oscillator, it will have to wake up from time to time to recalibrate.

Best regards,

Simon

[Surya]

hi Simonr, thanks for your reply.

as you can see my question is about if RC calibration is causing the current how to stop calibration. I don't want to change the clock option as I can't change the hardware now. 

• I want to know  "how much current will be drawn for calibration of the clock?"  if this is a known number.
• I am seeing these peeks when I initialized and stopped the BLE which should not happen. is it like if once i configure i can't stop calibration?