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PCF8576D Datasheet(PDF) 23 Page - NXP Semiconductors

Part No. PCF8576D
Description  Universal LCD driver for low multiplex rates
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCF8576D Datasheet(HTML) 23 Page - NXP Semiconductors

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PCF8576D
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 10 — 14 February 2011
23 of 50
NXP Semiconductors
PCF8576D
Universal LCD driver for low multiplex rates
A master receiver must signal an end of data to the transmitter by not generating an
acknowledge on the last byte that has been clocked out of the slave. In this event the
transmitter must leave the data line HIGH to enable the master to generate a STOP
condition.
Acknowledgement on the I2C-bus is shown in Figure 16.
7.16.5 I2C-bus controller
The PCF8576D acts as an I2C-bus slave receiver. It does not initiate I2C-bus transfers or
transmit data to an I2C-bus master receiver. The only data output from the PCF8576D are
the acknowledge signals of the selected devices. Device selection depends on the
I2C-bus slave address, on the transferred command data and on the hardware
subaddress.
In single device applications, the hardware subaddress inputs A0, A1 and A2 are normally
tied to VSS which defines the hardware subaddress 0. In multiple device
applications A0, A1 and A2 are tied to VSS or VDD in accordance with a binary coding
scheme such that no two devices with a common I2C-bus slave address have the same
hardware subaddress.
7.16.6 Input filters
To enhance noise immunity in electrically adverse environments, RC low-pass filters are
provided on the SDA and SCL lines.
7.16.7 I2C-bus protocol
Two I2C-bus slave addresses (0111 000 and 0111 001) are reserved for the PCF8576D.
The least significant bit of the slave address that a PCF8576D will respond to is defined by
the level tied to its SA0 input. The PCF8576D is a write-only device and will not respond to
a read access. Having two reserved slave addresses allows the following on the same
I2C-bus:
Up to 16 PCF8576Ds for very large LCD applications
The use of two types of LCD multiplex drive.
Fig 16. Acknowledgement of the I2C-bus
mbc602
S
START
condition
9
8
2
1
clock pulse for
acknowledgement
not acknowledge
acknowledge
data output
by transmitter
data output
by receiver
SCL from
master


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