Andy Green andy at openmoko.com
Mon Dec 8 11:26:49 CET 2008

Hash: SHA1

Somebody in the thread at some point said:
| Hi All,
| I had some questions .Probably a stupid question but I really want to
know how
| neo should work ,rather behave in such scenarios.
| Scenario 1:
| 1)when the neo is connected to charger/USB and the battery is taken out -
| should the neo shut down or is it supposed to remain ON and if ON how
long is
| it supposed to be ON?
| Actual behaviour right now:
| I have 2 phones and connected them to the charger with the battery out
- -One
| phone shuts down in a minute and the other stays ON for an hour or
so.Not sure
| which one of these is the expected behaviour.
| Should these phones remain ON with just the charger or should it shut

It matters if you have A5 or A6+ revision of GTA02 for this.  The A6 and
onwards have 47u capacitor smoothing an internal net called VB_SYS, it
means that it can better ignore short term power drains.  A5 has a
smaller cap and can experience more trouble.

When the battery is present, it acts as a giant capacitor and provides
the necessary power.  When it's absent it exposes the shakiness of just
the VB_SYS cap.

In Qi bootloader recently there are some improvements about this and it
seems it can be a little more reliable to operate without battery.

But generally, GTA02 wants a battery in it for normal operation
especially -->

| Scenario 2:
| 2)When the battery is out and phone is ON with just the charger, can
we make
| phone calls or use the device as a regular phone?(like make
| calls)
| Actual behaviour right now:
| As right now we cannot use the phone for calls/messages when connected
to just
| the charger without the battery.

No this will definitely not work... the GSM side stuff is directly
connected to the battery and does not get reliable power there when
there is no battery.

- -Andy
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