Universal LCD Driver for Low Multiplex Rates Including A Six-Channel PWM Generator

PCF8536

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The PCF8536 is a peripheral device which interfaces to almost any Liquid Crystal Display (LCD) with low multiplex rates. It generates the drive signals for any multiplexed LCD containing up to eight backplanes, up to 44 segments, and up to 320 elements. The PCF8536 is compatible with most microcontrollers and communicates via the two-line bidirectional I²C-bus (PCF8536AT) or a three line unidirectional SPI-bus (PCF8536BT). Communication overheads are minimized using a display RAM with auto-incremented addressing.

The PCF8536 features an on-chip PWM controller for LED illumination. Up to six independent channels can be configured. Each channel has 128 levels allowing the possibility for two RGB controllers. Each of them provides over 2 million colors. Each channel can also be used for static drive.

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PCF8536 BLOCK DIAGRAM

PCF8536 BLOCK DIAGRAM
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Features

  • Single-chip 320 segment LCD controller and driver with 6 channel PWM generator
  • 6 channel PWM generator for backlight LED illumination
  • Selectable display bias configuration
  • Wide range for digital power supply: from 1.8 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 twisted nematic LCDs
  • Low power consumption
  • Selectable backplane drive configuration: 4, 6, or 8 backplane multiplexing
  • LCD and logic supplies may be separated
  • 320-bit RAM for display data storage
  • 6 PWM outputs with a 7-bit resolution (128 steps) and drivers for external transistors
  • Programmable PWM frame frequency to avoid LCD backlight flickering
  • 400 kHz I²C-bus interface (PCF8536AT)
  • 5 MHz SPI-bus interface (PCF8536BT)
  • Programmable frame frequency in the range of 60 Hz to 300 Hz in steps of approximately 10 Hz; factory calibrated
  • 320 segments driven allowing:
    • up to 40 7-segment alphanumeric characters
    • up to 20 14-segment alphanumeric characters
    • any graphics of up to 320 elements
  • Manufactured in silicon gate CMOS process

Target Applications

  • White goods and consumer products

部品番号： PCF8536AT, PCF8536BT.

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