I2C Module

350.00 Br

  • Provides I2C to parallel data conversion
  • Backlight enable jumper
  • Contrast control potentiometer
  • 0x27 I2C default address.  Solder jumper selectable from 0x20 – 0x27
  • 100kHz I2C clock speed
  • 5V operation typical, but also operates at 3.3V.
Category: Tags: , ,
  • This LCD I2C interface adapter can be added to a 16 x 2 or 20 x 4 character LCD display with a standard parallel interface to make it I2C compatible. It can also be repurposed for other I2C to parallel tasks.
  • The board has a PCF8574 I2C chip that converts the I2C data from an MCU into 4-bit parallel data and control bits required by the LCD display.
  • By default, the industry standard HD44780 compatible 16 x 2 and 20 x 4 character LCD displays require 4 or 8 parallel data lines to drive them along with a couple of pins for chip select and chip enable.  This consumes a lot of pins on the MCU.  This adapter board reduces the data pin requirements to only 2 pins which can also be shared with other I2C devices.
  • The backlight can be controlled ON/OFF, but the intensity is not directly controllable though the I2C interface.  Some modules have a jumper on the board that supplies Vcc power to the backlight.  That jumper can be removed and a voltage applied to the header pin nearest the ‘LED’ markings on the board to provide power to the backlight separately.
  • The PCF8574 is a generic I2C to 8-bit I/O device and the module can be repurposed for other uses besides driving LCD modules.  Max I2C clock frequency is 100kHz which makes it most suited to lower speed applications.

You may also like…