Datasheet

1. General description
The PCF85134 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 60 segments. It can be easily
cascaded for larger LCD applications. The PCF85134 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-incremented addressing, by
hardware subaddressing, and by display memory switching (static and duplex drive
modes).
For a selection of NXP LCD segment drivers, see Table 26 on page 45
.
2. Features and benefits
 Single-chip LCD controller and driver
 Selectable backplane drive configurations: static, 2, 3, or 4 backplane multiplexing
 60 segment outputs allowing to drive:
 30 7-segment alphanumeric characters
 15 14-segment alphanumeric characters
 Any graphics of up to 240 elements
 Cascading supported for larger applications
 60  4-bit display data storage RAM
 Wide LCD supply range: from 2.5 V for low threshold LCDs up to 6.5 V for high
threshold twisted nematic LCDs
 Internal LCD bias generation with voltage follower buffers
 Selectable display bias configurations: static,
1
⁄
2
, or
1
⁄
3
 Wide logic power supply range: from 1.8 V to 5.5 V
 LCD and logic supplies may be separated
 Low power consumption
 400 kHz I
2
C-bus interface
 No external components required
 Display memory bank switching in static and duplex drive mode
 Versatile blinking modes
 Silicon gate CMOS process
PCF85134
Universal 60 x 4 LCD segment driver for multiplex rates up to
1:4
Rev. 3 — 12 May 2014 Product data sheet
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.