Test environnement :
- Mangoh board + WP8548 module with latest firmware release 11 (legato 16.04)
- And Prototype board including WP8548 module with latest firmware release 11 (legato 16.04)
We need some explanations on the start sequence for the RTC backup.
Indeed we use a battery and the mangOH kit which uses a 1.5mF capacitor but in any case we’re missing some information to use it correctly.
You’ll find enclosed a screenshot detailing start sequence and voltage level at RTC input(/output), and here’s my description :
Channel3 = Voltage accross a 10k resistor between 3V batterie and RTC input :
Phase 1 : At power on, during init, for 10 seconds : null consumption
Phase 2 : Then consumption of 2,4uA (24mV voltage shoot).
Phase 3 : When power is off, 5,5uA (55mV voltage shoot) consumption during a few seconds
Phase 4 : Then 150uA (1,5V)…
Could you provide information on the software code managing this sequence ? And by which mean could we stop the « charge » function as we only want to use RTC as an input to our backup battery ?