4 X 60 Automotive LCD Segment Driver with Integrated Charge Pump

PCA8543AHL

The PCA8543 is a peripheral device which interfaces to almost any Liquid Crystal Display (LCD) with low multiplex rates. It generates the drive signals for any static or multiplexed LCD containing up to four backplanes, 60 segments, and up to 240 elements. The PCA8543 is compatible with most microcontrollers and communicates via the two-line bidirectional I²C-bus. Communication overheads are minimized using a display RAM with auto-incremented addressing and display memory switching. The PCA8543 features an internal charge pump with internal capacitors for on-chip generation of the LCD driving voltages.

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Features

  • AEC-Q100 grade 2 compliant for automotive applications
  • Low power consumption
  • Extended operating temperature range from -40 °C to +105 °C
  • 60 segments and 4 backplanes allowing to drive:
    • up to 30 7-segment alphanumeric characters
    • up to 15 14-segment alphanumeric characters
    • any graphics of up to 240 elements
  • Selectable backplane drive configuration: static, 2, or 4 backplane multiplexing
  • Programmable internal charge pump for on-chip LCD voltage generation up to 3 x VDD2
  • 400 kHz I²C-bus interface
  • Selectable linear temperature compensation of VLCD
  • Selectable display bias configuration
  • Wide range for digital and analog power supply: from 2.5 V to 5.5 V
  • Wide LCD supply range: from 2.5 V for low threshold LCDs and up to 9.0 V for high threshold (automobile) twisted nematic LCDs
  • On-chip RAM for display data storage arranged in two banks
  • Display memory bank switching
  • Programmable frame frequency in steps of 10 Hz in the range of 60 Hz to 300 Hz; factory calibrated with a tolerance of ±15 % covering the whole temperature and voltage range
  • Selectable inversion scheme for LCD driving waveforms: frame or line inversion
  • Integrated temperature sensor with temperature readout
  • On chip calibration of internal oscillator frequency and VLCD

Target Applications

  • Instrument cluster
  • Car radio
  • Climate control units

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