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PCA9538 Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. PCA9538
Description  8-bit I2C and SMBus low power I/O port with interrupt and reset
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCA9538 Datasheet(HTML) 6 Page - NXP Semiconductors

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Philips Semiconductors
Product data sheet
PCA9538
8-bit I2C and SMBus low power I/O port
with interrupt and reset
2004 Oct 05
6
Device address
1
1
1
0
0
A1
A0
SLAVE ADDRESS
FIXED
HARDWARE SELECTABLE
R/W
SW02175
Figure 5. PCA9538 address
Bus transactions
Data is transmitted to the PCA9538 registers using the write mode as shown in Figures 6 and 7. Data is read from the PCA9538 registers using
the read mode as shown in Figures 8 and 9. These devices do not implement an auto-increment function so once a command byte has been
sent, the register which was addressed will continue to be accessed by reads until a new command byte has been sent.
12
SCL
WRITE TO
PORT
DATA OUT
FROM PORT
3
4
567
8
SDA
S0
A
A
A
11
1
0
0A1
A0
DATA 1
slave address
data to port
start condition
R/W
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
tpv
DATA 1 VALID
SW02176
9
1
00
0
0
00
0
command byte
P
Figure 6. WRITE to output port register
12
SCL
3
4
567
8
SDA
S0
A
A
A
11
1
0
0A1
A0
DATA
slave address
data to register
start condition
R/W
acknowledge
from slave
acknowledge
from slave
acknowledge
from slave
SW02177
9
00
0
0
00
1
command byte
1/0
DATA TO
REGISTER
P
Figure 7. WRITE to configuration or polarity inversion registers


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