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A008 / A6188+ – Circuit Description
mechanical SIM presence detect switch and to prevent the SIM card being removed
whilst connected to Aux Power.
NB With no SIM card, Antenna Off can be selected and the unit can be used
directly as an organiser without the use of the transceiver.
Logic: Charger Circuit
1) The charging operation is as follows:
2) After a charger has been detected MAN_TEST_AD, the
communicate with the device via DSC_EN.
3)
EXT B+
is fed in from
controlled by U9819,(these components are placed purely for high voltage
protection), this voltage will then be passed back to the source of Q932, where the
line
MOBPORTB
R932 Current Sense
I_SENSE, this is used to evaluate the charging current.
4) The charging current is then passed through
current is restricted by the signal
Q635.
CHRGC
is programmed during charger phasing.
5)
CHRG_EN
Whitecap
Logic: Deep Sleep Mode
1) Deep sleep mode is there to provide a facility to save battery life by intermittently
shutting off part of the PCB. This is achieved in the following way. The signal
STDBY
is generated from Whitecap Pin F1, and from here the signal is then passed
onto
Q960
and
Q921.
2) Grounding
VREF
3) Grounding
V2
This switches off MAGIC, and inhibits the Transmit path through
RF_V2
4) Also the signal is passed through a standby delay using the logic gate
diode
CR701
these provide a short delay between the de-activation of
and the activation of LS_V1. Which will support the Down-link lines during sleep
mode.
5) The shutdown is only for a fraction of a second and during that time the GCAP Clock
supports the logic side of the unit. The GCAP clock is generated by Y900, which
generates a 32.768MHz clock. This clock is output from Whitecap
directly to Whitecap Pin P4. The clock is always monitored by Whitecap and should
it fail, the unit will no longer go into deep sleep mode.
Motorola Internal Use
Accessory Connector J600
detects the presence of
Resistor, the voltage drop over it is sent to
CHRGC
Pin 1, biases
Q634
This has the effect respectively of:
which makes MAGIC inoperable
Whitecap U700
Pin 14 to the source of Q901,
EXT B+.
The current is sensed through
CR932
to charge
BATT
–
GCAP II
Pin E8, this opens the gate of
On or Off
13
will
GCAP II
Pin D9
+. The charge
U9820
and
V2
and
VREF
Pin C7
and fed
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