A5 Power routing "minor issues" for some modules
allen_chang at mc.fic.com.tw
Tue Feb 26 16:25:56 CET 2008
Andy Green 提到:
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> Somebody in the thread at some point said:
>>> - vibrator
>> I think it's OK to connect to VB_SYS.
> I was looking at the vibrator drive signals earlier and there is all
> kinds of nasty inductive spikes on them, due in part to this NC snubber
> diode I guess. This can make possibly make trouble.
Sorry, your sch is too old. The diode is not NC.
>>> - whole GSM subsystem
>> Like tony's suggestion, phone always uses the battery to support the power.
>> Adaptor or USB is not good for supporting the GSM power.
> Really even a 1A adapter, 5W, cannot be made to do better than the battery?
For the GSM_modem, the VB connect to GSM_MODEM's PMU vbat pin.
Even it is 1A, I don't suggest to do that.
Myabe we has some trouble on GSM_MODEM. (Ex, vbat input range can't
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