pca9538d NXP Semiconductors, pca9538d Datasheet - Page 7

• Manufacturer Part Number: pca9538d
• Description: 8-bit I2c And Smbus Low Power I/o Port With Interrupt And Reset
• Manufacturer: NXP Semiconductors

1. This figure assumes the command byte has previously been programmed with 00h.
2. Transfer of data can be stopped at any moment by a stop condition.
Philips Semiconductors
NOTES:
2006 Sep 21
8-bit I
I/O port with interrupt and reset
S
READ FROM
DATA INTO
1
PORT
SDA
PORT
SCL
1
2
INT
C-bus and SMBus low power
1
slave address
t
iv
0
0
start condition
S
A1 A0
1
1
acknowledge
from slave
2
1
R/W
0
3
1
slave address
A
4
0
5
0
6
A1 A0
COMMAND BYTE
7
t
t
R/W
ph
ir
8
1
Figure 9. READ input port register
Figure 8. READ from register
9
A
acknowledge
from slave
acknowledge
from slave
DATA 2
A
at this moment master-transmitter
becomes master-receiver and
slave-receiver becomes
slave-transmitter
data from port
7
S
DATA 1
1
DATA 3
1
slave address
1
0
t
0
ps
A1 A0
A
acknowledge
from master
acknowledge
from slave
R/W
1
A
data from port
DATA 4
data from register
DATA 4
last byte
data from register
DATA
no acknowledge
from master
first byte
DATA
PCA9538
Product data sheet
no acknowledge
from master
NA
SW02178
acknowledge
from master
NA
SW02179
P
stop
condition
P
A