PCF8545ATT datasheet(24/51 Pages) NXP

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NXP Semiconductors

PCF8553

40 × 4 LCD segment driver

Apply VDD(2)

Apply VLCD(1)

Reset

Write display data

Set device control

Set display control

POWER-ON

Disable display

Remove VLCD(1)

Remove VDD(2)

POWER-OFF

aaa-011937

1. Can be simultaneous with VDD.

2. Can be simultaneous with VLCD.

Figure 15. Recommended power-up and power-off sequence

10 Bus interfaces

10.1 I2C-bus interface

The I2C-bus is for bidirectional, two-line communication between different ICs. The

two lines are a Serial DAta line (SDA) and a Serial CLock line (SCL). Both lines must

be connected to a positive supply via a pull-up resistor. Data transfer may be initiated

only when the bus is not busy. Both data and clock lines remain HIGH when the bus is

not busy. The PCF8553 acts as a slave receiver when being written to and as a slave

transmitter when being read from.

aaa-010487

Write

ACK from

slave

slave address + 0

write data

read data

Read

ACK from

slave

ACK from

slave

ACK from

master

slave address + 1

ACK from

slave

ACK from

slave

ACK from

master

ACK from

slave

Figure 16. I2C read and write protocol

PCF8553

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

Product data sheet

Rev. 4 — 20 April 2021

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