Functional Description
CPB902
C P B 9 0 2 U s e r M a n u a l
59
© 2 0 0 8 F a s t w e l v . 1 . 5 b E
J17 connector pinout is given in Table 4.18. Table 4.19 presents designation of contacts of the
J18 pinpad, which is used to set the LCD driver power voltage.
Table 4.18:
J17 Connector Pinout
Pin #
Function
Pin #
Function
1
KEY R0
16
LCD TRIM
2
KEY C2
17
LCD_RS
3
KEY C1
18
LCD_R/W
4
KEY R1
19
LCD_E
5
KEY R2
20
LCD_D0
6
KEY C0
21
LCD_D1
7
KEY C3
22
LCD_D2
8
KEY R3
23
LCD_D3
9
KEY R4
24
LCD_D4
10
KEY C4
25
LCD_D5
11
KEY C5
26
LCD_D6
12
KEY R5
27
LCD_D7
13
GND
28
/LCD_CS1
14
GND
29
/LCD_CS2
15
+5V
30
/LCD_RST
Table 4.19:
J18 Pinpad Pinout
Pin #
Name
Function
1
VEE
Driver power input
2
GND
Common ground
3
VEE
Driver power input
4
“-7 V”
-7 V supply from module
The figure below (4.25) shows circuit diagram explaining the function of the J18 pinpad.
If a commercial temperature range LCD module is used, the LCD TRIM line voltage should be
0 to +5 V (J18 jumper in position 1-2, voltage adjusted by R154). If an extended temperature range
LCD module is used, it is possible that the LCD TRIM voltage should have negative value
(J18 jumper in position 3-4, voltage adjusted by R154).
Figure 4.25:
J18 Pinpad Connection Circuit Diagram
1
2
3
4
R154
+5V
0V
-7V
To LCD T RIM Contact
J18
