PCF8578T/1 NXP Semiconductors, PCF8578T/1 Datasheet - Page 18

• Manufacturer Part Number: PCF8578T/1
• Description: IC, LCD DRIVER, ROW/COLUMN, 56VSOP
• Manufacturer: NXP Semiconductors

Specifications of PCF8578T/1

• Supply Current: 20µA
• No. Of Digits / Alpha: 36
• Meter Display Type: LCD
• Supply Voltage Range: 2.5V To 6V
• Driver Case Style: VSOP
• No. Of Pins: 56
• Operating Temperature Range: -40°C To +85°C
• Base: RoHS Compliant
• No. Of Segments: 384
• Interface Type: I2C
• Rohs Compliant: Yes

NXP Semiconductors
PCF8578_6
Product data sheet
Fig 13. System configuration
SDA
SCL
8.8.4 Acknowledge
TRANSMITTER /
RECEIVER
MASTER
The number of data bytes transferred between the START and STOP conditions from
transmitter to receiver is unlimited. Each data byte of eight bits is followed by one
acknowledge bit. The acknowledge bit is a HIGH level put on the bus by the transmitter,
whereas the master generates an extra acknowledge related clock pulse. A slave receiver
which is addressed must generate an acknowledge after the reception of each byte. Also
a master must generate an acknowledge after the reception of each byte that has been
clocked out of the slave transmitter. The device that acknowledges must pull down the
SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during
the HIGH period of the acknowledge related clock pulse (set-up and hold times must be
taken into consideration). A master receiver must signal the end of a data transmission 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.
Fig 11. Bit transfer
Fig 12. Definition of START and STOP condition
SDA
SCL
RECEIVER
SLAVE
START condition
SDA
SCL
S
Rev. 06 — 5 May 2009
TRANSMITTER /
LCD row/column driver for dot matrix graphic displays
RECEIVER
SLAVE
data valid
data line
stable;
change
allowed
of data
TRANSMITTER
MASTER
STOP condition
TRANSMITTER /
mba607
RECEIVER
MASTER
P
PCF8578
© NXP B.V. 2009. All rights reserved.
mba605
mba608
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