Behavioural mixed-signal model1602A + PCF8574 backpacklcd_i2c
LCD 16×2 / 20×4 with I²C adapter (PCF8574)
HD44780 text LCD with soldered-on PCF8574 I²C adapter (P0 = RS, P1 = RW, P2 = E, P3 = backlight, P4–P7 = D4–D7): only four wires. Address 0x27 (PCF8574A: 0x3F). Drive with LiquidCrystal_I2C.
Key data
- Category
- Modules
- Simulation model
- Behavioural mixed-signal model
- Manufacturer part number
- 1602A + PCF8574 backpack
- Reference prefix
- DS
- Pins
- 4
- Land pattern
- PinHeader_1x04_P2.54mm_Vertical
Simulation model
A behavioural model implements the interface of the chip (registers, protocol, timing) at its pins. The pins are connected to the analog circuit like CMOS pins.
- Model
- lcd_i2c
- Supply pins
- VCC / GND
Pins 4
| Pin | Name | Use |
|---|---|---|
| GND | GNDGround pin | Ground |
| VCC | VCCSupply pin | Supply (see the module: usually 3.3–5 V) |
| SDA | SDAI/O pin | I²C data: pull-up (about 4.7 kΩ) to the supply |
| SCL | SCLInput pin | I²C clock: sensors, displays; pull-up (about 4.7 kΩ) to the supply |
Parameters 2
I²C address
addrDefault0x27
0x270x3F0x20
Format
sizeDefault16x2
16x220x4
PCB
Connector / off-board
PinHeader_1x04_P2.54mm_VerticalLCD 16×2 / 20×4 with I²C adapter (PCF8574) as a module on a 4-pin header (GND, VCC, SDA, SCL) – compare the order with your own module