Datasheet

1. General description
The PCF8545 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 multiplexed LCD
containing up to eight backplanes, and up to 320 elements. The PCF8545 is compatible
with most microcontrollers and communicates via the two-line bidirectional I
2
C-bus
(PCF8545A) or a three line unidirectional SPI-bus (PCF8545B). Communication
overheads are minimized using a display RAM with auto-incremented addressing.
For a selection of NXP LCD segment drivers, see Table 40 on page 61
.
2. Features and benefits
 Single-chip 320 elements LCD controller and driver
 Wide range for digital power supply: from 1.8 V to 5.5 V
 LCD supply range from 2.5 V up to 5.5 V
 LCD and logic supplies may be separated
 Low power consumption
 Selectable backplane drive configuration: 4, 6, or 8 backplane multiplexing
 Selectable display bias configuration
 320-bit RAM for display data storage
 400 kHz I
2
C-bus interface (PCF8545A)
 5 MHz SPI-bus interface (PCF8545B)
 Programmable frame frequency in the range of 60 Hz to 300 Hz in steps of 10 Hz;
factory calibrated
 320 segments driven allowing:
 up to 40 7-segment alphanumeric characters
 up to 20 14-segment alphanumeric characters
 any graphics of up to 320 elements
 Manufactured in silicon gate CMOS process
3. Applications
 Industrial and consumer products
PCF8545
Universal LCD driver for multiplex rates up to 1:8
Rev. 1 — 13 November 2013 Product data sheet
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 21.