PCA85176(2010) View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

PCA85176
(Rev.:2010)

Universal LCD driver for low multiplex rates

NXP Semiconductors. 

NXP Semiconductors

PCA85176

Universal LCD driver for low multiplex rates

• Up to 16 PCA85176 for very large LCD applications

• The use of two types of LCD multiplex drive

The I2C-bus protocol is shown in Figure 16. The sequence is initiated with a START

condition (S) from the I2C-bus master which is followed by one of two possible PCA85176

slave addresses available. All PCA85176 whose SA0 inputs correspond to bit 0 of the

slave address respond by asserting an acknowledge in parallel. This I2C-bus transfer is

ignored by all PCA85176 whose SA0 inputs are set to the alternative level.

R/W

slave address

acknowledge by

all addressed

PCA85176s

acknowledge

by A0, A1 and A2

selected

PCA85176 only

S

S 0 1 1 1 0 0A 0AC

COMMAND

A

DISPLAY DATA

AP

0

1 byte

Fig 16. I2C-bus protocol

n ≥ 1 byte(s)

n ≥ 0 byte(s)

update data pointers

and if necessary,

subaddress counter

013aaa053

After an acknowledgement, one or more command bytes follow that define the status of

each addressed PCA85176.

The last command byte sent is identified by resetting its most significant bit, continuation

bit C (see Figure 17). The command bytes are also acknowledged by all addressed

PCA85176 on the bus.

MSB

C

LSB

REST OF OPCODE

Fig 17. Format of command byte

msa833

After the last command byte, one or more display data bytes may follow. Display data

bytes are stored in the display RAM at the address specified by the data pointer and the

subaddress counter. Both data pointer and subaddress counter are automatically updated

and the data directed to the intended PCA85176 device.

An acknowledgement after each byte is asserted only by the PCA85176 that are

addressed via address lines A0, A1, and A2. After the last display byte, the I2C-bus

master asserts a STOP condition (P). Alternately a START may be asserted to restart an

I2C-bus access.

PCA85176_1

Product data sheet

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

Rev. 01 — 14 April 2010

© NXP B.V. 2010. All rights reserved.

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