PCF8579T NXP Semiconductors, PCF8579T Datasheet - Page 16

• Manufacturer Part Number: PCF8579T
• Manufacturer: NXP Semiconductors

Specifications of PCF8579T

• Operating Supply Voltage (typ): 3.3/5V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: VSO
• Pin Count: 56
• Mounting: Surface Mount
• Power Dissipation: 400mW
• Operating Supply Voltage (min): 2.5V
• Operating Supply Voltage (max): 6V
• Lead Free Status / Rohs Status: Not Compliant

NXP Semiconductors
PCF8579_5
Product data sheet
Fig 13. 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 multiple device applications, the hardware subaddress pins of the PCF8579s (A0 to A3)
are connected to V
more devices share the same slave address, then each device must be allocated a
unique hardware subaddress.
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
/
SS
1 A
A
or V
PCF8578s / PCF8579s
at this moment master
transmitter becomes a
master receiver and
PCF8578/PCF8579 slave
receiver becomes a
slave transmitter
Rev. 05 — 11 May 2009
S 0 1 1 1 1 0
acknowledge by
DD
all addressed
n
COMMAND
slave address
to represent the desired hardware subaddress code. If two or
0 byte(s)
n bytes
DATA
(a)
(c)
(b)
LCD column driver for dot matrix graphic displays
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
PCF8579
© NXP B.V. 2009. All rights reserved.
1
msa832
P
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