PCF8534 Datasheet, PDF (1/40 Pages) NXP Semiconductors – Universal LCD driver for low multiplex rates

PCF8534
Universal LCD driver for low multiplex rates
Rev. 00.05 — 20 February 2007
Preliminary datasheet
1. General description
The PCF8534 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 60 segments and can easily be cascaded
for larger LCD applications. The PCF8534 is compatible with most
microprocessors / microcontrollers and communicates via a two-line bidirectional I²C-bus.
Communication overheads are minimized using a display RAM with auto-incremented
addressing, hardware subaddressing and display memory switching (static and duplex
drive modes).
2. Features
„ Single-chip LCD controller / driver
„ Selectable backplane drive
configuration: static or 2 / 3 / 4
backplane multiplexing
„ Selectable display bias configuration: „ Internal LCD bias generation with
static, ¹â„₂ or ¹â„₃
„ 60 segment drives: up to thirty
voltage-follower buffers
„ 60 x 4-bit RAM for display data storage
8-segment numeric characters; up to
sixteen 15-segment alphanumeric
characters; or any graphics of up to
240 elements
„ Auto-incremented display data loading „ Display memory bank switching in static
across device subaddress boundaries
and duplex drive modes
„ Versatile blinking modes
„ LCD and logic supplies may be
separated
„ Wide power supply range: from
„ Wide LCD supply range: from 2.5 V for
1.8 to 5.5 V
low threshold LCDs and up to 6.5 V for
guest-host LCDs and high threshold
(automobile) twisted nematic LCDs
„ Low power consumption
„ 400 kHz I²C-bus interface
„ TTL/CMOS compatible
„ Compatible with 4-bit, 8-bit or 16-bit
microprocessors/microcontrollers
„ May be cascaded for 2 LCD applications „ No external components
„ Manufactured in silicon gate CMOS
process.