CANADUINO 3 x I2C Port Expander Interface Module PCF8574 for 1602 2004 4002 4004 12864 LCD

Description

• DESCRIPTION I2C Interface Module PCF8574/PCF8574A compatible with our 1602 and 2004 LCD Character Matrix Modules with HD44780 or compatible display controller; fits right on the back of the LCD module (Soldering required); comes with on-board I2C Address Selection - Backlight Switch - Contrast Regulation
• SPECIFICATIONS Interface Chip PCF8574 or PCF8574A; I2C Microcontroller Interface; Supports 4 or 8 Bit Display Mode; Operating Voltage 5V; I2C Address Selection; LCD Contrast Control ; LCD Backlight Control
• CONTENT 3 x I2C-to-Parallel Interface Module for compatible Character LCD Modules
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3 x I2C Adapter Board, fits right on the back of most LC display modules with Hitachi HD44780 or a compatible display controller.
The on board PCF8574 or PCF8574A 8-bit I/O expander encodes the signals for the 4 data bits, the read/write select, register select, the enable signal, and the backlight on signal.
The supported I2C addresses depend on the version of the expander IC please refer to the manufacturer PDF or find plenty of information online (for example Arduino forum). When connected to an Arduino, for example, the function of every pin can be easily modified by changing the parameters in your Arduino sketch.
Additional features:
on board transistor to drive a LED backlight
3 solder jumpers for address selection
jumper to turn on backlight continuously
generator for contrast voltage
contrast control potentiometer
A typical pinout is, for example:
1 VSS (ground)
2 VDD (+5V)
3 contrast voltage
4 RS (register select)
5 R/W (read/write)
6 Enable
11 Data 4
12 Data 5
13 Data 6
14 Data 7
15 LED[+]
16 LED [-]
Pins 7, 8, 9 and 10 are not connected because not used in 4-bit data mode.
Additional circuit design information:
The I2C bus on development boards like the Arduino series of boards doesnt have the necessary pull-up resistors already installed. To make a I2C connection happen, you will need pull-up resistors from VDD to SDA and SCL. The value of these resistors is not critical, as long the wires are not too long, the data rate high, or many devices are connected to the same bus. For just 1 or 2 displays on 5V logic level is a value of 1.8k to 12k a good choice.

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