Motorola T200 Service Manual page 64

Topaz T2688/T200, T2988/T205 L3 Circuit Description
These are:
? Power on generated by set alarm, which is generated from the RTC (the alarm
is set into the menu structure of the phone).
? IO2, software originated power on from
? From depressing the Power On key giving the signal PWR.
? From the External Charger (CHGERP).
77. As the unit begins to power up the reset signal is generated, again a +ve going signal.
Charging C57 generates the charge for the reset signal.
78. As for the GCAP the
the SIM card is provided by Pin 20, onto SIM Block Pins 4 & 5. However the
occasional need for 5V SIM is provided using the input from the scaled
Pin 17 and the charge pump
79. Data is read from the SIM card on pin 2 of the SIM block I/O into
and transmitted to the
SIM CLK U27 Pin 13[in] & Pin 19 [out]
Pin 12 [in] and Pin 16 [out]
80. SIM I/O also ac ts as a SIM Presence detect signal.
81. Power for the unit can be taken from either internal Battery or from an external
source. The battery has 4 contacts, from
?
Pin 1 Supplies
?
Pin 2 BATEMP
fed to VEGA
?
Pin 3 BAID
batteries.
?
Pin4 is ground
Alternatively the
originates at the I/O connector U40
signal is then fed as CHGERP, and through
will ensure the unit powers up but will also pass through
D14 to provide VBAT.
82. U30 is used to detect the charger and is supported by DVCC, once detected an
interrupt is sent to
83. For the Initial charge at low battery voltage, as before the input voltage at
is approximately
Ground
84. NOTE: If a desktop charger then
of the charging indicator on the charger.
13
Power Control IC
C53 Pins 21 & 9.
Gemini from U27
(SIM Block
VBAT directly
is used to monitor Battery temperature during charging, and is
for A / D processing.
is Battery ID and is used for the detection of different types of
VBAT source can be taken from an external power source, this
Pin A3, with
D15 limits input voltage to <6V
Gemini as IO9
6V,CHGERP originates at
I06
Motorola Proprietary Information
U54 Pin 2
Gemini Pin 112.
U53 Pin 1
also interfaces with the SIM Card, VCC for
Pin 11 (S-IO). Also from
(SIM Block Pin 1) and the SIM Reset
Pin 3)
battery connector JP2
U36 providing ESD protection, the
Fuse F1. As mentioned in Point 76 this
BQ3 and protection diode
U40 Pin T3 with T1 as its respective
is used to communicate to the Gemini the status
U54 Pin 1
U53 Pin 2
DVCC on
U27 Pin 15 (IO)
Gemini are the
U27
CHGERP