34 X 128 Pixel Matrix Driver

PCF8531U

The PCF8531 is a low-power CMOS LCD row and column driver, designed to drive dot matrix graphic displays at multiplex rates of 1:17, 1:26, and 1:34. Furthermore, it can drive up to 128 icons. All necessary functions for the display are provided in a single chip, including on-chip generation of VLCD and the LCD bias voltages, resulting in a minimum of external components and low power consumption. The PCF8531 is compatible with most microcontrollers and communicates via a two-line bidirectional I²C-bus. All inputs are CMOS compatible.

Remark:The icon mode is used to reduce current consumption. When only icons are displayed, a much lower operating voltage (VLCD) can be used and the switching frequency of the LCD outputs is reduced. In most applications it is possible to use VDD as VLCD.

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Block diagram: PCF8531U

PCF8531 Block Diagram

PCF8531 Block Diagram
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Features

  • Single-chip LCD controller and driver
  • 34 row and 128 column outputs
  • Display data RAM 34 × 128 bits
  • 128 icons (last row is used for icons)
  • Fast-mode I²C-bus interface (400 kbit/s)
  • Software selectable multiplex rates: 1:17, 1:26, and 1:34
  • Icon mode with multiplex rate 1:2:
    • Featuring reduced current consumption while displaying icons only
  • On-chip:
    • Generation of VLCD (external supply also possible)
    • Selectable linear temperature compensation
    • Oscillator requires no external components (external clock also possible)
    • Generation of intermediate LCD bias voltages
    • Power-On Reset (POR)
  • No external components required
  • Software selectable bias configuration
  • Logic supply voltage range VDD1 to VSS1: 1.8 V to 5.5 V
  • Supply voltage range for on-chip voltage generator VDD2 and VDD3 to VSS1 and VSS2: 2.5 V to 4.5 V
  • Display supply voltage range VLCD to VSS:
    • Normal mode: 4 V to 9 V
    • Icon mode: 3 V to 9 V
  • Low-power consumption, suitable for battery operated systems
  • CMOS compatible inputs
  • Manufactured in silicon gate CMOS process

Target Applications

  • Telecommunication systems
  • Automotive information systems
  • Point-of-sale terminals
  • Instrumentation

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