1-4 (No.RA019<Rev.001>)
2.2 COMPONENTS DESCRIPTION
2.2.1 SUB (Display) unit (XC3-0020-20)
2.3 TERMINAL FUNCTION
2.3.1 Sub (Display) unit (XC3-0020-20)
Ref.No Part Name Description
IC1 IC Voltage regulator (50M)
IC2 IC Voltage regulator (30LCD)
IC3 IC Logic control
IC4 IC Analog SW
IC6 IC Illuminance sensor
IC8 IC LED driver
IC9 IC Logic control
IC10 IC I/O expander
IC12 IC Logic control
Q2 FET DC SW
Q3, 4 Transistor DC SW
Q6 Transistor DC SW
D1, 2 Zener diode Overvoltage protection
D4~7 LED LED
D9~12 LED LED
D14~16 LED LED
D20 Zener diode Overvoltage protection
D21 LED LED
D22 Diode Overvoltage protection
D23, 24 Zener diode Overvoltage protection
D25 Varistor Surge protector
D26~32 Zener diode Overvoltage protection
Pin No. Name I/O Function
CN2 (to Main unit A/2 CN900 of transceiver)
1 SP+ I Speaker output
2 SPG - Speaker ground
3 GND - Ground
4 SB I Switched power supply
CN4 (LCD)
1 VSSA - Ground
2 VSSA - Ground
3 VSSA - Ground
4VCC O3Voutput
5VCC O3Voutput
6 VSSD - Ground
7 VSSD - Ground
8 VSSD - Ground
9 IOVCC O 1.8V output
10 IOVCC O 1.8V output
11 RDX O LCD driver RD signal
12 WRX O LCD driver WR signal
13 DCX O LCD driver data/command switch
signal
14 CSX O LCD driver chip-serect signal
15 DB1 I/O LCD driver data output
16 DB2 I/O LCD driver data output
17 DB3 I/O LCD driver data output
18 DB4 I/O LCD driver data output
19 DB5 I/O LCD driver data output
20 DB6 I/O LCD driver data output
21 DB7 I/O LCD driver data output
22 DB8 I/O LCD driver data output
23 DB10 I/O LCD driver data output
24 DB11 I/O LCD driver data output
25 DB12 I/O LCD driver data output
26 DB13 I/O LCD driver data output
27 DB14 I/O LCD driver data output
28 DB15 I/O LCD driver data output
29 DB16 I/O LCD driver data output
30 DB17 I/O LCD driver data output
31 CABC - No connection
32 RESX O LCD driver reset signal
33 IM0 O Interface mode select
34 LEDA O 54M output (LED light anode)
35 LED1 I LED light cathode 1
36 LED2 I LED light cathode 2
37 LED3 I LED light cathode 3
38 LED4 - No connection
CN5 (Internal speaker)
1 SPG - Speaker ground
2 SP+ O Speaker output
CN6 (to Main unit A/2 CN749 of transceiver)
1 GND - Ground
2 R_SET0 O Radio setting signal 0
3 R_SET1 O Radio setting signal 1
4 R_SET2 O Radio setting signal 2
5 ME - MIC ground
6 MIC O MIC signal output
7 AFO- I AF signal input minus
8 AFO+ I AF signal input plus
9 /PSW O Detection signal input of power
switch
10 /PTT O PTT output
11 TXD I Serial data input
12 RXD O Serial data output
13 GND - Ground
14 DM/KVL I/O MIC data detection
15 33M I 3.3V input
Pin No. Name I/O Function
