PC8576C-1 View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
'PC8576C-1' PDF : 57 Pages View PDF
NXP Semiconductors
PCF8576C
Universal LCD driver for low multiplex rates
data output
by transmitter
data output
by receiver
SCL from
master
S
1
2
START
condition
Fig 18. Acknowledgement of the I2C-bus
not acknowledge
acknowledge
8
9
clock pulse for
acknowledgement
mbc602
7.16.5 PCF8576C I2C-bus controller
The PCF8576C 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 PCF8576C are
the acknowledge signals of the selected devices. Device selection depends on the
I2C-bus slave address, the transferred command data and the hardware subaddress.
In single device application, 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 using a binary coding scheme so that no two
devices with a common I2C-bus slave address have the same hardware subaddress.
In the power-saving mode it is possible that the PCF8576C is not able to keep up with the
highest transmission rates when large amounts of display data are transmitted. If this
situation occurs, the PCF8576C forces the SCL line LOW until its internal operations are
completed. This is known as the clock synchronization feature of the I2C-bus and serves
to slow down fast transmitters. Data loss does not occur.
7.16.6 Input filter
To enhance noise immunity in electrically adverse environments, RC low-pass filters are
provided on the SDA and SCL lines.
7.17 I2C-bus protocol
Two I2C-bus slave addresses (0111000 and 0111001) are reserved for the PCF8576C.
The least significant bit of the slave address that a PCF8576C responds to is defined by
the level tied at its input SA0. Therefore, two types of PCF8576C can be distinguished on
the same I2C-bus which allows:
• Up to 16 PCF8576Cs on the same I2C-bus for very large LCD applications.
• The use of two types of LCD multiplex on the same I2C-bus.
PCF8576C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 10 — 22 July 2010
© NXP B.V. 2010. All rights reserved.
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