PCF8531
34 x 128 pixel matrix driver
Rev. 05 — 10 August 2010
Product data sheet
1. General description
The PCF8531 is a low-power CMOS
1
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 V
LCD
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 I
2
C-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 (V
LCD
) can be used and the switching
frequency of the LCD outputs is reduced. In most applications it is possible to use V
DD
as
V
LCD
.
2. Features and benefits
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 I
2
C-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 V
LCD
(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 V
DD1
to V
SS1
: 1.8 V to 5.5 V
Supply voltage range for on-chip voltage generator V
DD2
and V
DD3
to V
SS1
and V
SS2
:
2.5 V to 4.5 V
Display supply voltage range V
LCD
to V
SS
:
Normal mode: 4 V to 9 V
1.
The definition of the abbreviations and acronyms used in this data sheet can be found in
Section 19.
NXP Semiconductors
PCF8531
34 x 128 pixel matrix driver
Icon mode: 3 V to 9 V
Low-power consumption, suitable for battery operated systems
CMOS compatible inputs
Manufactured in silicon gate CMOS process
3. Applications
Telecommunication systems
Automotive information systems
Point-of-sale terminals
Instrumentation
4. Ordering information
Table 1.
Ordering information
Package
Name
PCF8531U
-
Description
chip with bumps in tray
Version
-
Type number
PCF8531
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 05 — 10 August 2010
2 of 51
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