pca9501 NXP Semiconductors, pca9501 Datasheet - Page 6

• Manufacturer Part Number: pca9501
• Description: 8-bit I2c And Smbus I/o Port With Interrupt, 2-kbit Eeprom And 6 Address Pins
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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).
2004 Sep 30
READ FROM
PORT
8-bit I
2-kbit EEPROM and 6 address pins
DATA INTO
PORT
WRITE TO
PORT
DATA OUT
FROM PORT
INT
SDA
SCL
2
START CONDITION
C and SMBus I/O port with interrupt,
SDA
START CONDITION
S
SLAVE ADDRESS (I/O EXPANDER)
1
0
S
A5 A4 A3 A2 A1
t iv
2
SLAVE ADDRESS (I/O EXPANDER)
0
3
A5 A4 A3 A2 A1
4
DATA 1
5
6
A0
7
R/W
8
0
A0
A
Figure 6. I/O WRITE mode (output)
R/W
t ph
ACKNOWLEDGE
FROM SLAVE
Figure 7. I/O READ mode (input)
1
A
ACKNOWLEDGE
FROM SLAVE
DATA 2
DATA TO PORT
DATA FROM PORT
DATA 1
6
DATA 1
DATA 3
t pv
A
ACKNOWLEDGE
FROM SLAVE
t ps
A
ACKNOWLEDGE
FROM MASTER
t ir
DATA TO PORT
DATA 1 VALID
DATA FROM PORT
DATA 2
DATA 4
DATA 4
t pv
A
ACKNOWLEDGE
FROM SLAVE
PCA9501
Product data sheet
DATA 2 VALID
1
SW00650
STOP
CONDITION
SW00649
P