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BV4542 I2C User Interface

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This is an I2C user interface for use with microcontrollers, for example the Arduino, Raspberry Pi etc..
The output is in the form of an LCD display and the input is a membrane type keypad or any other switches.
Full I/O control can be realised with only 2 wires. The keypad has an optional 79 byte buffer relieving the host microcontroller of a considerable burden.
  • I2C display 16x1 AND 16x2, mode selectable
  • User selectable I2C address (BV4542)
  • Software adjustable contrast
  • Software variable back light, variable brightness
  • 79 key buffer
  • 25 way keypad interface
  • Interrupt pins
  • Wide voltage 3.3V to 5V
  • 5V: 10mA BL on, 1.5mA BL off, 280uA sleep * see data sheet
  • 3V3: 4.71mA BL on, 1.3mA BL off, 170uA sleep * see data sheet
  • Only 2 wires for full I/O control
  • Wake from sleep by keypad
This can be used in a lower power application because of the sleep mode, ideal for building into projects as only 2 wires are used freeing up valuable resources. Keypad strokes are captured without the main controller needing to constantly monitor the input.
More information can be found here

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