PCF8545ATTAY datasheet(7/68 Pages) NXP

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NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

Input or input/output pins must always be at a defined level (VSS or VDD) unless otherwise

specified.

Symbol

Type

Description

SDA

input/output I2C-bus serial data

SDI

input

SPI-bus data input

Table 3. Pin description of PCF8545ATT and PCF8545BTT...continued

[1]

VLCD must be equal to or greater than VDD.

[2]

Effect of backplane swapping is illustrated in Figure 5.

[3]

Bit BPS is explained in Section 7.1.3.

7 Functional description

The PCF8545 is a versatile peripheral device designed to interface any microcontroller

to a wide variety of LCDs. It can directly drive any multiplexed LCD containing up to eight

backplanes and up to 44 segments.

7.1 Commands of PCF8545

The PCF8545 is controlled by 9 commands, which are defined in Table 4. Any other

combinations of operation code bits that are not mentioned in this document may lead to

undesired operation modes of PCF8545.

Bits

Command name

selection

RS[1:0][1]

Reference

initialize

Section 7.1.1

OTP-refresh

Section 7.1.2

mode-settings

BPS

INV

Section 7.1.3

oscillator-control

EFR

COE

OSC

Section 7.1.4

set-MUX-mode

M[1:0]

Section 7.1.5

set-bias-mode

B[1:0]

Section 7.1.6

frame-frequency

FD[4:0]

Section 7.1.7

load-data-pointer

DP[5:0]

Section 7.1.8

write-RAM-data

D[7:0]

Section 7.1.9

Table 4. Commands of PCF8545

[1]

Information about control byte and register selection see Section 8.1.

7.1.1 Command: initialize

This command generates a chip-wide reset. It has the same function as the RESET pin.

Reset takes 1 ms to complete.

Bit

Symbol

Value

Description

7 to 0

0001 0110

fixed value

Table 5. Initialize - initialize command bit description

PCF8545

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 2 — 4 October 2021

7 / 68

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