nRF9160 wake-up / turn on using hall effect sensor

[rajeev]

I am trying to find a way to either turn on or wake up nRF9160 using a hall effect sensor. When the magnet is closer or attached, the nRF9160 should be in the lowest power mode (we call this shipment mode) and as soon as the magnet is removed, the device should wake up and enter the active processing state.

I am planning to use DRV5032 hall effect sensor from TI for this, however, not sure what is the best way to implement this in HW as well as the SW.

Any suggestion will be really helpful to get this going.

[Øyvind]

Hello, 

The initial suggestion is to use System OFF which can be trigged by a GPIO.

The device is put into System OFF mode using the REGULATORS register interface. When in System OFF mode, one of the following signals/actions will wake up the device:

1. DETECT signal, generated by the GPIO peripheral
2. RESET
3. start of debug session

When the device wakes up from System OFF mode, a system reset is performed.

Kind regards,
Øyvind

[rajeev]

Øyvind thanks for your response. This is very helpful and I will look into this.