Tait TM8100 mobiles Service Manual page 100

Figure 3.16 Block diagram of the control-head board with 1-, 2- or 3-digit display
Signal Types:
analog
clock
digital
asynchronous
serial data
synchronous
serial data
Elastomeric Strips
LCD
Light Pipes
LED Lenses
Control-
Control-head
Head
options board
Options
attached via
Board
connector
(optional)
Concealed
Microphone
(optional)
Contact made
when key
pressed
On/Off Key
Contact made
when key
pressed
Function
Keys
Contact made
when key
Channel-
pressed
Selection
Keys
Speaker Leads
Speaker
100 Circuit Descriptions
RXD
TXD
CH GPIO1
Microphone PTT
Connector
RX AUD
Protection
MIC AUD IN
Circuitry
+13V8 SW
GND
LCD Driver
D1 D2
LEDs LED Drivers
Q7
D2 D3
RST
OE
CH LE
CH SPI CLK
Control-
+3V3
Head
+13V8 SW
Options
MIC AUD IN P1
Connector
MIC AUD OUT
DGND
AGND
MIC+
MIC+
Soldering
AGND
Pads
VOL WIP DC
Volume +3V3
Control
AGND
(not implemented)
R50
+13V8 SW
CH ON OFF
Switch Pads
R51
DGND
LINK
Switch Pads
Key Drivers
Switch Pads
SPK+
Speaker
SPK–
Connector
GND
CH SPI DO
+3V3
CH SPI CLK
CH LE
OE
RST
DGND
RST
OE
CH LE
CH SPI CLK
+3V3
+13V8 SW
DGND
CH SPI DI
CH LE
CH SPI CLK
+3V3
DGND
C1 C50
R53
© Tait Electronics Limited November 2007
CH RXD
CH TXD
CH GPIO1
CH PTT
R52
RX AUD
MIC AUD OUT
R11
CH SPI DO
Control-
Head
Connector
Control-Head
Board
VOL WIP DC
+13V8 SW
CH ON OFF
DGND
CH SPI DI
CH LE
CH SPI CLK
+3V3
L1 AGND
SPK+
SPK–
TM8100/TM8200 Service Manual