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PCA9501 Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. PCA9501
Description  8-bit I2C and SMBus I/O port with interrupt, 2-kbit EEPROM and 6 address pins
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCA9501 Datasheet(HTML) 6 Page - NXP Semiconductors

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Philips Semiconductors
Product data
PCA9501
8-bit I2C and SMBus I/O port with interrupt,
2-kbit EEPROM and 6 address pins
2003 Sep 12
6
I/O OPERATIONS (see also Figure 4)
Each of the PCA9501’s eight I/Os can be independently used as an input or output. Output data is transmitted to the port by the I/O WRITE
mode (see Figure 6). Input I/O data is transferred from the port to the microcontroller by the READ mode (See Figure 7).
S
0
A5
A4
A3
A2
A1
A0
0
A
DATA 1
A
DATA 2
A
SDA
SCL
t pv
12
34
5
6
7
8
t pv
DATA 2 VALID
DATA 1 VALID
SW00649
ACKNOWLEDGE
FROM SLAVE
R/W
START CONDITION
ACKNOWLEDGE
FROM SLAVE
ACKNOWLEDGE
FROM SLAVE
SLAVE ADDRESS (I/O EXPANDER)
DATA TO PORT
DATA TO PORT
WRITE TO
PORT
DATA OUT
FROM PORT
Figure 6. I/O WRITE mode (output)
S
0
A5
A4
A3
A2
A1
A0
1
A
DATA 1
A
DATA 4
1
SDA
t ph
t ps
DATA 4
P
DATA 2
DATA 3
SW00650
SLAVE ADDRESS (I/O EXPANDER)
DATA FROM PORT
DATA FROM PORT
READ FROM
PORT
DATA INTO
PORT
START CONDITION
ACKNOWLEDGE
FROM SLAVE
R/W
ACKNOWLEDGE
FROM MASTER
STOP
CONDITION
DATA 1
INT
t iv
t ir
Figure 7. I/O READ mode (input)


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