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.
Feature
- 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
- Telecommunication systems
- Automotive information systems
- Point-of-sale terminals
- Instrumentation
