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PCF8576D Datasheet(PDF) 24 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) 24 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
24 of 50
NXP Semiconductors
PCF8576D
Universal LCD driver for low multiplex rates
The I2C-bus protocol is shown in Figure 17. The sequence is initiated with a START
condition (S) from the I2C-bus master which is followed by one of two possible PCF8576D
slave addresses available. All PCF8576Ds 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 PCF8576Ds whose SA0 inputs are set to the alternative level.
After an acknowledgement, one or more command bytes follow, that define the status of
each addressed PCF8576D.
The last command byte sent is identified by resetting its most significant bit, continuation
bit C, (see Figure 18). The command bytes are also acknowledged by all addressed
PCF8576D on the bus.
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 PCF8576D device.
An acknowledgement after each byte is asserted only by the PCF8576Ds 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.
Fig 17. I2C-bus protocol
Fig 18. Format of command byte
mdb078
S
A
0
S
011100
0 A C
COMMAND
A
P
A
DISPLAY DATA
slave address
R/W
acknowledge by
all addressed
PCF8576Ds
acknowledge
by A0, A1 and A2
selected
PCF8576D only
1 byte
update data pointers
and if necessary,
subaddress counter
n
≥ 1 byte(s)
n
≥ 0 byte(s)
msa833
REST OF OPCODE
C
MSB
LSB


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