1. General description
The PCF8533 is a peripheral device which interfaces to almost any Liquid Crystal Display
(LCD)
1
with low multiplex rates. It generates the drive signals for any static or multiplexed
LCD containing up to four backplanes and up to 80 segments and can easily be cascaded
for larger LCD applications. The PCF8533 is compatible with most microcontrollers and
communicates via the two-line bidirectional I
2
C-bus. Communication overheads are
minimized by a display RAM with auto-incremental addressing, by hardware
subaddressing and by display memory switching (static and duplex drive modes).
2. Features and benefits
Single-chip LCD controller and driver
Selectable backplane drive configuration: static, 2, 3, or 4 backplane multiplexing
Selectable display bias configuration: static,
1
⁄
2
,or
1
⁄
3
Internal LCD bias generation with voltage follower buffers
80 segment outputs allowing to drive:
40 7-segment alphanumeric characters
20 14-segment alphanumeric characters
Any graphics of up to 320 elements
80 4 bit RAM for display data storage
Auto-incremental display data loading across device subaddress boundaries
Display memory bank switching in static and duplex drive modes
Versatile blinking modes
Independent supplies possible for LCD and logic voltages
Wide power supply range: from 1.8 V to 5.5 V
Wide LCD supply range: from 2.5 V for low threshold LCDs up to 6.5 V for high
threshold twisted nematic LCDs
Low power consumption
400 kHz I
2
C-bus interface
May be cascaded for large LCD applications (up to 5120 elements possible)
No external components required
Compatible with Chip-On-Glass (COG) technology
Manufactured using silicon gate CMOS process
PCF8533
Universal LCD driver for low multiplex rates
Rev. 6 — 1 October 2012 Product data sheet
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.
