PCF8536AT datasheet(26/53 Pages) NXP

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NXP Semiconductors

PCA8551

Automotive 36 × 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

Reset: internal power-on reset if PORE = 1, or software reset. If an external oscillator is used,

clock must be available after reset.

1. Can be simultaneous with VDD.

2. Can be simultaneous with VLCD.

Figure 17. Recommended power-up and power-off sequence

10 Bus interfaces

10.1 I2C-bus interface of the PCA8551A

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 PCA8551A 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 18. I2C read and write protocol

PCA8551

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

Product data sheet

Rev. 3.1 — 3 May 2021

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