Just got my Pinephone running with PureOS to cover the time until my Librem5 is delivered. So I started getting more interest and did the following to estimate the best standby time:
- looked up the datasheets of imx8 and gemalto modem (stated here 2-5mA should be possible in deep sleep)
- took the minimal power that theoretically is needed to have the modem respond to calls and wake up the imx8 soc (calculated with 5mA on 3.5V = 0.0175 W?)
- took the power of the imx8 soc in deep sleep (0.078W)
Adding up I came to a maximum theoretical standby time of 105 hours on a 2000mAh battery. I’m not an electrical engineer and there is probably some error somewhere (please correct me), but at the moment that seems to be the maximum time the phone would be able to wait for incoming calls or sms with everything else switched off as far as possible by the design of the two needed components. Left out are all other components that might be needed to connect the parts.
P.D. (edit) I’d really use a deep sleep standby if it would be possible since I’m fine if only sms and calls can disturb me. Every other interaction with my phone I prefer to initiate myself ;-). Is deep sleep possible, yet?