HD44780 1602 / 2004 Character LCD Interface
Industry standard 16-pin interface for dot-matrix alphanumeric LCD modules (16x2, 20x4) based on the Hitachi HD44780 controller, supporting 4-bit and 8-bit parallel modes.
Aliase:1602 LCD, 2004 LCD, HD44780, Character Display, LCD1602
16-Pin Single Row Header
16 Pins
Pinout Table16
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | VSS | Ground | Ground (0V) |
| 2 | VDD | Power | Power Supply (+5V DC) |
| 3 | V0 | Analog | Contrast Adjustment (0 - 5V via 10k potentiometer) |
| 4 | RS | Digital | Register Select (LOW: Instruction Register, HIGH: Data Register) |
| 5 | R/W | Digital | Read/Write Select (LOW: Write to LCD, HIGH: Read from LCD; tie to GND for write-only operation) |
| 6 | E | Digital | Enable Strobe — data/command is read on the falling edge; minimum pulse width 450ns |
| 7 | D0 | Digital | Bidirectional Data Bit 0 (8-bit mode) |
| 8 | D1 | Digital | Bidirectional Data Bit 1 (8-bit mode) |
| 9 | D2 | Digital | Bidirectional Data Bit 2 (8-bit mode) |
| 10 | D3 | Digital | Bidirectional Data Bit 3 (8-bit mode) |
| 11 | D4 | Digital | Bidirectional Data Bit 4 (4-bit & 8-bit mode) |
| 12 | D5 | Digital | Bidirectional Data Bit 5 (4-bit & 8-bit mode) |
| 13 | D6 | Digital | Bidirectional Data Bit 6 (4-bit & 8-bit mode) |
| 14 | D7 | Digital | Bidirectional Data Bit 7Busy Flag (BF) |
| 15 | A (LED+) | Power | Backlight LED Anode (+5V with series resistor) |
| 16 | K (LED-) | Ground | Backlight LED Cathode (Ground) |