Home Products Character LCD WH2004D

Character Display LCD Modules 20x4

Model No. WH2004D

►Character LCD Module 20x4
►5x8 dots includes cursor
►Bulit-in controller (ST7066 or Equivalent)
►+5V power supply (Also available for +3V)
►Negative voltage optional for +3V power supply
►1/16 duty cycle
►LED can be driven by PIN1, PIN2, PIN15, PIN16 or A and K
►Interface : 6800, option SPI/I2C (RW1063 IC)


WH2004D series are 20x4 character display modules which are built in with ST7066 controller IC; its default interface is 6800 4/8-bit parallel. The LCD module 20x4 displays are also available in SPI and I2C interface by using RW1063 controller IC. WH2004D is available in several different backlight colors including blue, green, white, yellow-green, amber, red and white LEDs. There are different character fonts/texts available for ST7066 IC including English/Japanese, English/West European, English/Scandinavian European, or English/Cyrillic (Russian) as options.

There are different interface options for WH2004D series, details as below:
►WH2004D : 6800 interface (ST7066 IC)
►WH2004D1 : SPI interface (RW1063 IC)
►WH2004D2 : I2C interface (RW1063 IC)


WH2004D Character Display Modules, LCD Module 20x4, Display LCD 20x4


Interface Pin Function

Pin No. Symbol Description
1 VSS Ground
2 VDD Power supply for logic
3 VO Contrast Adjustment
4 RS Data/ Instruction  select signal
5 R/W Read/Write select signal
6 E Enable signal
7~14 DB0~DB7 Data bus line
15 A Power supply for B/L +
16 K Power supply for B/L -

Mechanical Data

Item Standard Value Unit
Module Dimension 77.0 × 47.0 mm
Viewing Area 60.0 × 22.0 mm
Mounting Hole 70.0 × 40.0 mm
Character Size 2.30 × 4.03 mm

Electrical Characteristics

Item Symbol Standard Value
Input Voltage VDD 3/5 V
Recmmended LCD Driving
Voltage for Normal Temp.
Version module @25°C
VDD-VO 4.50 V

Display Character Address Code

Display Position 1 2 3 4 5 6 7 8 9 10 11 12 13 --- --- 20
DD RAM Address 00 01                           13
DD RAM Address 40 41                           53
DD RAM Address 14 15                           27
DD RAM Address 54 35                           67

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