Panasonic EB-GD90, Technical Manual

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INTERFACES AND TEST POINTS
MCUK990801G8 Section 2 Issue A
Technical Guide – 9 – Revision 0
2 INTERFACES AND TEST POINTS
2.1 Interfaces
2.1.1 Main and Keypad PCBs
The interface between Main and Keypad PCBs is made via a 34-way connector as follows:
Figure 2.1: GD90 Interboard Connector
No. Signal Name MAIN <=> KEYPAD Function Connection
1 GROUND -
2 D28V - Power Source for LCD Module
3 KEYBKLT ==> Key Backlight Power Source Charge IC pin 16
4 LCD_GRN ==> LCD Green Backlight Power Charge IC pin 18
5 LCD_RED ==> LCD Red Backlight Power Charge IC pin 17
6 A(1) ==> MPU Address bus (1) GEMINI pin 25
7 RnW ==> MPU Read/nWrite signal GEMINI pin 20
8 KBC(4) ==> Key Column 4 signal for Key scan GEMINI pin 128
9 KBC(3) ==> Key Column 3 signal for Key scan GEMINI pin 129
10 KBC(2) ==> Key Column 2 signal for Key scan GEMINI pin 130
11 KBC(0) ==> Key Column 0 signal for Key scan GEMINI pin 132
12 KBC(1) ==> Key Column 1signal for Key scan GEMINI pin 133
13 D(4) <==> MPU Data bus (4)
14 D(3) <==> MPU Data bus (3)
15 D(2) <==> MPU Data bus (2)
16 D(1) <==> MPU Data bus (1)
17 D(0) <==> MPU Data bus (0)
18 GROUND - l
19 D28V - Power Source for LCD Module
20 nPOWKEY <== Power Key sense signal
21 PAGING_LED ==> Paging LED control signal SIM_PWR IC pin 22
22 CHARGE_LED ==> Charge LED control signal GEMINI pin 105
23 nRESET ==> MPU nRESET signal
24 CS_LCD ==> LCD chip select signal GEMINI pin 55
25 KBR(3) <== Key Row 3 signal for Key scan GEMINI pin 123
26 KBR(2) <== Key Row 2 signal for Key scan GEMINI pin 124
27 KBR(4) <== Key Row 4 signal for Key scan GEMINI pin 122
28 KBR(1) <== Key Row 1 signal for Key scan GEMINI pin 125
29 KBR(0) <== Key Row 0 signal for Key scan GEMINI pin 126
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
GND
D28V
KEYBKLT
LCD_GRN
LCD_RED
A(1)
RnV
KBC(4)
KBC(3)
KBC(2)
KBC(0)
KBC(1)
D(4)
D(3)
D(2)
D(1)
D(0)
GND
D28V
nPOWKEY
PAGING_LED
CHARGING_LED
nRESET
KBR(3)
KBR(2)
KBR(4)
KBR(1)
KBR(0)
D(5)
D(6)
D(7)
REC_P
REC_N
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
CS_LCD
10075-1