1. General description
The PCF8566 is a peripheral device which interfaces to almost any Liquid Crystal Display
(LCD) with low multiplex rates. It generates the drive signals for any static or multiplexed
LCD containing up to four backplanes and up to 24 segments and can easily be cascaded
for larger LCD applications. The PCF8566 is compatible with most microprocessors or
microcontrollers and communicates via a two-line bidirectional I
2
C-bus. Communication
overheads are minimized by a display RAM with auto-incremented addressing, by
hardware subaddressing and by display memory switching (static and duplex drive
modes).
2. Features
n Single-chip LCD controller/driver
n 24 segment drives:
u Up to twelve 7-segment numeric characters including decimal pointer
u Up to six 14-segment alphanumeric characters
u Any graphics of up to 96 elements
n Versatile blinking modes
n No external components required (even in multiple device applications)
n Selectable backplane drive configuration: static or 2, 3, 4 backplane multiplexing
n Selectable display bias configuration: static,
1
⁄
2
or
1
⁄
3
n Internal LCD bias generation with voltage-follower buffers
n 24 × 4-bit RAM for display data storage
n Auto-incremented display data loading across device subaddress boundaries
n Display memory bank switching in static and duplex drive modes
n LCD and logic supplies may be separated
n 2.5 V to 6 V power supply range
n Low power consumption
n Power-saving mode for extremely low power consumption in battery-operated and
telephone applications
n I
2
C-bus interface
n TTL and CMOS compatible
n Compatible with any 4, 8 or 16-bit microprocessor or microcontroller
n May be cascaded for large LCD applications (up to 1536 segments possible)
n Cascadable with 40-segment LCD driver PCF8576C
n Optimized pinning for plane wiring in both and multiple PCF8566 applications
n Space-saving 40-lead plastic very small outline package (VSO40; SOT158-1)
n Manufactured in silicon gate CMOS process
PCF8566
Universal LCD driver for low multiplex rates
Rev. 07 — 25 February 2009 Product data sheet
