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PCF8531U

34 × 128 pixel matrix driver

Philips Electronics 

Philips Semiconductors

34 × 128 pixel matrix driver

Product specification

PCF8531

1 FEATURES

• Single-chip LCD controller/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 Mux 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.

• No external components required

• Software selectable bias configuration

• Logic supply voltage range VDD1 to VSS1 1.8 to 5.5 V

• Supply voltage range for on-chip voltage generator VDD2

and VDD3 to VSS1 and VSS2 2.5 to 4.5 V

• Display supply voltage range VLCD to VSS:

– Normal mode 4 to 9 V

– Icon mode 3 to 9 V.

• Low power consumption, suitable for battery operated

systems

• CMOS compatible inputs

• Manufactured in silicon gate CMOS process.

2 APPLICATIONS

• Telecommunication systems

• Automotive information systems

• Point-of-sale terminals

• Instrumentation.

3 GENERAL DESCRIPTION

The PCF8531 is a low power CMOS LCD row/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 bus (I2C-bus). All inputs are CMOS

compatible.

Remark: Icon mode is used to save current. 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.

4 PACKAGES

The PCF8531 is available as chip with bumps in tray.

5 ORDERING INFORMATION

TYPE

NUMBER

PCF8531U

NAME

−

PACKAGE

DESCRIPTION

chip with bumps in tray

VERSION

−

1999 Aug 10

3

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