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P7389i – Circuit Description
•
V3
– Programmed to 2.003V to support the Whitecap, but does support the normal
2.75V logic output from the Whitecap, it originates from GCAP II Pin B5 and can be
measured on
C909
•
VSIM1
– Used to support either 3V or 5V SIM cards. Will dynamically be set to 3V
upon power up, but if the card cannot be read then the SIM card is powered down and
an attempt to read the card at 5V is tried. VSIM1 can be measured on
distributed from GCAP II Pin C6 (For further information, see SIM Card Operation).
•
VREF
– Programmed as
MAGIC DM IC, distributed from GCAP II Pin G9 and can be measured on C919.
•
-5V
– Used to drive display and
through
Q160.
Both voltages produced by
•
SR_VCC
– Power Cut Circuit - Used to buffer the
in soft reset within the unit's software. The reason for this is to protect the user from
any accidental loss of power up to 0.5 seconds i.e. If the unit is knocked, causing a
slight battery contact bounce, the
normally, whilst internally the unit resets itself. During this loss of power the unit
takes it's power from
•
V1_SW –
See Deep Sleep Mode
5) Once the power source has been selected to power the phone on the
be toggled low. This can be done by pressing the
which is supported by
external fast charger, if a battery is present, then again the
low.
Motorola Internal Use
or C910.
V2
i.e. 2.775 and provides a reference voltage for the
–10V
– Used for RF GSM / DCS selection signals
SR_VCC
RTC BATTERY+
PWR_SW
(GCAP II Pin C8). Alternatively by plugging in an
V1
through
U903
and U904.
SRAM U702
will, to the user, keep the unit running
and is originated from
Power Key S500
ON_2
10
C905
and is
voltage with a built
GCAP II
Pin E1
PWR_SW
must
to create ON_2,
line will be pulled
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