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GDM2004D-FL-YBW
VER 1.0
2/9
2003/12/09
Block diagram
DB0-DB7
E
R/W
RS
VDD
V0
VSS
LED BKL
LCD PANEL
SEG
COM
SEG
LCD
AND
DRIVER
DRIVER
LCD
CONTROLLER
LED-
LED+
R
Interface pin description
Pin no.
Symbol
External
connection
Function
1
VSS
Signal ground for LCM (GND)
2
VDD
Power supply for logic (+5V) for LCM
3
V0
Power supply
Contrast adjust
4
RS
MPU
Register select signal
5
R/W
MPU
Read/write select signal
6
E
MPU
Operation (data read/write) enable signal
7~10
DB0~DB3
MPU
Four low order bi-directional three-state data bus lines.
Used for data transfer between the MPU and the LCM.
These four are not used during 4-bit operation.
11~14
DB4~DB7
MPU
Four high order bi-directional three-state data bus lines.
Used for data transfer between the MPU
15
LED+
Power supply for BKL (Anode)
16
LED-
LED BKL power
Supply
Power supply for BKL (GND)
Contrast adjust
A）For Single Source
For Module with Normal Temperature Range Fluid
VDD~V0: LCD Driving voltage
VR: 10k~20k
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