Sony SPP-874 Service Manual page 29

• IC401 LC662716A (SYSTEM CONTROL) (HANDSET)
Pin No. Pin Name
1 BEEP ATT
2 TX-DATA
3 BEEP
4 VSS
5 OSC1
6 OSC2
7 VDD
8 RESET
9 BAT-IN
10 PE1
11 TEST
12 HOLD
13 – 16 ACT4
17 CHARGE DET
18 BAT-LOW-IN
19 —
20 RX-DATA
21 PLL-STB
22 PLL-DATA
23 PLL-CLK
24 SIG-DATA-IN
25 TX+B CTRL
26 HICUT MUTE
27 RSSI CTRL
28 VOLUME
29 – 32 P80 – 83
33 MODE0
34 MODE1
35 TEST CLK
36 TEST I/O
37, 38 PA0, 1
39 LIGHT
40 TALK LED
41 – 45 ROW1 – 5
46 JOG-EN1
47 JOG-PUSH
48 JOG-EN2
49 – 52 COL1 – 4
53 LCD+B CTRL
54 LCD-E
55 LCD-R/W
56 LCD-RS
57 – 60 LCD-DB4 – 7
61 EEPROM WP
62 EEPROM DATA
63 EEPROM CLK
64 MIC ON
I/O
O Beep volume High/Low control output (L: High)
O RF transmission data output
O Beep output
— Ground
— Crystal oscillation input (4.048MHz)
— Crystal oscillation output (4.048MHz)
— Power supply pin
— Reset input
I Battery detection input
— Not used. (Fixed at L in this set.)
— Not used. (Fixed at L in this set.)
I Input for intermittent. (CR external)
O Output for intermittent reception control. (L: at operation)
I Charge detection input (H: in charge)
I Battery low-voltage detection input
— Not used. (Fixed at L (SPP-874/884:E92), H (SPP-884:E12) in this set.)
I RF reception data input
O PLL control standby output
O PLL control data output
O PLL control clock output
I RSSI/LOCK signal input (L: RSSI, H: LOCK)
O TX power control output
O High band noise mute output
O RSSI sens select output (L: Low sens)
O VOLUME HIGH/NORM select output
O Not used. (Fixed at H in this set.)
Destination model select input 0 (Fixed at L (SPP-874:E92/884),
I
H (SPP-874:E12) in this set.)
I Destination model select input 1 (Fixed at L in this set.)
I/O At initial ID writing, clock input/output.
I/O At TEST start-up or ID writing, data input/output. (L: TEST start-up)
— Not used. (Fixed at L in this set.)
O Key & LCD back light LED control output
O TALK LED control output
O Key matrix output
I JOG input
I JOG input
I JOG input
I Key matrix input
O LCD power control output (L: at operation)
O LCD-R/W trigger output
O LCD-R/W control output
O LCD register select signal output
O LCD-DATA output
O EEPROM write protect output
I/O EEPROM data input/output
O EEPROM clock output
O MIC ON/OFF control output (L: OFF)
– 39 –
Pin Description