MOTOROLA CONFIDENTIAL - PROPRIETARY
18
November 20, 2000
6881036B20
Circuit Description
Product Family 38C
LS3_ to Whitecap IC
Pin F3
DAT0_TX.
•
RX: Data from Whitecap IC
Pin B5
DATA0_RX to GCAP II
Pin H8
LS3_RX where the signal is level-shifted to desired voltage and output
on
Pin J8
SIM I/O to SIM contacts
J803 Pin 6
SIM I/O.
• SIM_PD. From BATT_THERM battery contact. With no batteries present, the
unit will not power-up. If batteries are present, but colder than -15° C and no
card is inserted, the output of the comparator
Q905
stays high and the unit
displays
INSERT CARD
. When the battery temperature is above -15° C
(BATT_THERM voltage approximately 2.51V), but the SIM card is either not
inserted or faulty,
CHECK CARD
displays.
Charger Circuit
Either the mid-rate charger or the full rate charger may be used. (See also “Charger
Power Source” on page 14.)
In standby,
Q905
is opened to provide the approximately 50mA required by the
PF38C Personal Communicator circuitry.
Q900
also opens, controlled by CHRGC
(GCAP II
Pin E8
) to provide a charge of 350mA to the battery. The charger is
capable of supplying the 400mA of current required to support the Personal
Communicator in standby while, at the same time, charging its internal battery.
Charging current is monitored at GCAP II
Pin D9
I_SENSE by monitoring the
voltage drop across current sense resistor
R913
.
In standby, MIDRATE_1 = 0 and MIDRATE_2 = 0
000722-O
Figure 10. Standby Operation Battery Charging
Summary of Contents for 38C V100
Page 1: ...Level 3 Service Manual Model V100 GSM Technology Product Family 38C Personal Communicator ...
Page 2: ......
Page 73: ...V100 BOARD LAYOUT PAGE 1 2 ...
Page 74: ...V100 BOARD LAYOUT PAGE 2 2 ...
Page 77: ...V100 CONNECTOR SCHEMATICS ...
Page 78: ...V100 DISPLAY SCHEMATICS ...
Page 79: ...V100 FM SCHEMATICS ...
Page 81: ......
Page 83: ......