20x4 character LCD with light text on a dark background and a full RGB backlight for software-controlled character color. HD44780-compatible; dual backlight LEDs at ~20 mA each, total ~40 mA per channel at 5V.
ground
logic supply
contrast input
register select
read/write select
enable
data bit 0
data bit 1
data bit 2
data bit 3
data bit 4
data bit 5
data bit 6
data bit 7
backlight anode
backlight cathode
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VSS | 1 | power | ground | |
| VDD | 2 | power | logic supply | |
| VO | 3 | signal | contrast input | |
| RS | 4 | signal | register select | |
| RW | 5 | signal | read/write select | |
| E | 6 | signal | enable | |
| D0 | 7 | signal | data bit 0 | |
| D1 | 8 | signal | data bit 1 | |
| D2 | 9 | signal | data bit 2 | |
| D3 | 10 | signal | data bit 3 | |
| D4 | 11 | signal | data bit 4 | |
| D5 | 12 | signal | data bit 5 | |
| D6 | 13 | signal | data bit 6 | |
| D7 | 14 | signal | data bit 7 | |
| A/LED+ | 15 | power | backlight anode | |
| K/LED- | 16 | power | backlight cathode |
SPI · I2C · 3.3 V · 3.3 – 5 V · Breakout
Adafruit describes product 398 as a 16x2 RGB backlight LCD using digital pins for LCD control and PWM pins for the backlight; the product…
Module pins: VSS, VDD, A/LED+, K/LED-, VO, RS, RW, E. Schematik maps them to your board in the app.
16×2 and 20×4 character LCDs (parallel, I2C backpack, Qwiic, Grove), SPI TFTs from 0.71 to 3.5 inches, and large DSI and HDMI capacitive-touch panels up to 13.3 inches.
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