PCF8578T/1 NXP Semiconductors, PCF8578T/1 Datasheet - Page 20

• 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 15. I
a. Master transmits to slave receiver (WRITE mode)
b. Master reads after sending command string (write commands; read data)
c. Master reads slave immediately after sending slave address (READ mode)
S
0 1 1 1 1 0
2
C-bus protocol
slave address
S
A
0
S
R W
In READ mode, indicated by setting the read/write bit HIGH, data bytes may be read from
the RAM following the slave address acknowledgement. After this acknowledgement the
master transmitter becomes a master receiver and the PCF8578 becomes a slave
transmitter. The master receiver must acknowledge the reception of each byte in turn. The
S
0 A C
/
0 1 1 1 1 0
0 1 1 1 1 0
slave address
slave address
1 byte
n
COMMAND
1 byte
PCF8578s / PCF8579s
PCF8578s / PCF8579s
S
A
0
acknowledge by
R W
acknowledge by
S
A
all addressed
0
all addressed
R W
/
0 A C
/
1 A
A
PCF8578s / PCF8579s
at this moment master
transmitter becomes a
master receiver and
PCF8578/PCF8579 slave
receiver becomes a
slave transmitter
S 0 1 1 1 1 0
Rev. 06 — 5 May 2009
acknowledge by
all addressed
n
COMMAND
slave address
0 byte(s)
n bytes
DATA
(a)
LCD row/column driver for dot matrix graphic displays
(c)
(b)
acknowledge
from master
S
A
0
R W
A
1 A
/
A
DISPLAY DATA
update data pointers
subaddress counter
n
and if necessary,
0 byte(s)
last byte
n bytes
acknowledge
DATA
DATA
from master
by A0, A1, A2 and A3
selected PCF8578s /
update data pointers
subaddress counter
PCF8579s only
and if necessary,
acknowledge
no acknowledge
from master
A
A
1
msa831
P
update data pointers
subaddress counter
msa830
P
and if necessary
no acknowledge
last byte
from master
DATA
PCF8578
© NXP B.V. 2009. All rights reserved.
1
msa832
P
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