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PWM during sleep mode

Hello,

I am using the module nRF52840 and nRF SDK 15.2.0. I would like to start a PWM, going to sleep mode and still having the pwm running.

I tried combining the pwr_mgmt example and pwm_library example but when i enter in shutdown mode, the PWM stops.

1. Is there a way to achieve this ?

2. Maybe another sleep mode allow this instead of the shutdown mode ? 

3. Do you have any idea concerning current consumption when the device is using PWM ?

4. What would be the gain of Low-Power PWM (low_pwr_pwm example) ?