Service Manual
25
40 PWB_IN Power-on/ power-off signal
J4: to aviation jack of front panel
Pin No. Name Function
1 ACC_IO1 Digital input
2 PTT_IN Digital input
3 Handset_Audio Analog output
4 USB_D- USB data cable
5 GND Ground
6 USB_VBUS Power supply
7 MIC_IN Analog input
8 USB_D+ USB data cable
9 HOOK Hook signal input
10 ACC_IO2 Digital input
J2: to LCD display jack
Pin No. Name Function
1 GND Ground
2 VCI 2.5V-3.3V adjustable port
3 VCI 2.5V-3.3V adjustable port
4 IOVCC 1.65V-3.3V adjustable; input/output port
5 FLM Synchronization signal control pin
6 CS Chip select signal
7 RS Register select
8 WR Write signal
9 RD Read signal
10 DB0
11 DB1
12 DB2
13 DB3
14 DB4
15 DB5
16 DB6
17 DB7
18 DB8
19 DB9
20 DB10
21 DB11
22 DB12
23 DB13
24 DB14
25 DB15
26 DB16
27 DB17
Data bus
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