PCF8545 datasheet(42/68 Pages) NXP

42 / 68 page

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

013aaa466

command byte

Bias sytem = 1/3 B[1:0] = 11

unused

R/W

SCL

SDI

In this example, the bias system is set to 1⁄3. The transfer is terminated by CE returning to logic 1. After the last bit is

transmitted, the state of the SDI line is not important.

Figure 34. SPI-bus example

9 Internal circuitry

A0, RESET,

OSCCLK

VDD

VSS

aaa-008328

BP0 to BP7,

S0 to S39

VLCD

VSS

VLCD, VDD,

SCL, SDA

VSS

Figure 35. Device protection diagram for PCF8545A

CE, RESET,

OSCCLK

VDD

VSS

BP0 to BP7,

S0 to S39

VLCD

VSS

SDI, SCL

VLCD,VDD

VSS

aaa-008329

Figure 36. Device protection diagram for PCF8545B

10 Safety notes

CAUTION

This device is sensitive to ElectroStatic Discharge (ESD). Observe

precautions for handling electrostatic sensitive devices.

Such precautions are described in the ANSI/ESD S20.20, IEC/ST 61340-5,

JESD625-A or equivalent standards.

PCF8545

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

Product data sheet

Rev. 2 — 4 October 2021

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