PCF8531USLASH2 datasheet(3/44 Pages) PHILIPS

3 / 44 page

2000 Feb 11

Philips Semiconductors

Product speciﬁcation

× 128 pixel matrix driver

PCF8531

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

and1:34

• 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.

APPLICATIONS

• Telecommunication systems

• Automotive information systems

• Point-of-sale terminals

• Instrumentation.

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: The 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.

PACKAGES

The PCF8531 is available as chip with bumps in tray.

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

PCF8531U/2

−

chip with bumps in tray

−

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