MOTOROLA CONFIDENTIAL - PROPRIETARY
16
November 20, 2000
6881036B20
Circuit Description
Product Family 38C
GCAP II
Pin D6
.
Once a power source has been selected, PWR_SW must be toggled low. This can be
done by pressing power key
S500
to create ON_2, which is supported by PWR_SW
(GCAP II
Pin C8
). ON_2 is also pulled low when an external [fast] charger is
plugged in, providing a battery is present. (See also “Charger Circuit” on page 18.)
The power-up sequence continues as shown in Figure 8.
On initial power up, all the keypad backlights (
DS500
-
DS509
and
DS512
-
DS522
)
and display backlights (
DS504
-
DS510
on the antenna board in flip housing) are
turned on. They are supported by the signal ALRT_VCC (B+ through
Q903
) and
switched by BKLT_EN (Whitecap IC
Pin K3
) through
Q907
.
000720-O
Figure 8. Power-up Sequence Timing Diagram
RESET
SPI_CE
R/W
VCLK
DSC_EN
V1
UPLINK
500
0
50
100
200
300
250
350
150
400
450
EPROM CE
SRAM VB&LB
GCAP
SPI_CE MAGIC
CLK SELECT
DOWNLINK
BFSR 1.7 after RESET, BCKLR at 1.6s
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: ......