PCA9501 查看數據表（PDF） - Philips Electronics

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PCA9501

8-bit I2C and SMBus I/O port with interrupt, 2-kbit EEPROM and 6 address pins

Philips Electronics 

Philips Semiconductors

8-bit I2C and SMBus I/O port with interrupt,

2-kbit EEPROM and 6 address pins

Product data

PCA9501

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).

SCL

12 345 678

SLAVE ADDRESS (I/O EXPANDER)

DATA TO PORT

SDA S 0 A5 A4 A3 A2 A1 A0 0 A

DATA 1

START CONDITION

WRITE TO

PORT

R/W ACKNOWLEDGE

FROM SLAVE

DATA TO PORT

A

DATA 2

ACKNOWLEDGE

FROM SLAVE

A

ACKNOWLEDGE

FROM SLAVE

DATA OUT

FROM PORT

t pv

Figure 6. I/O WRITE mode (output)

DATA 1 VALID

t pv

DATA 2 VALID

SW00649

SLAVE ADDRESS (I/O EXPANDER)

DATA FROM PORT

SDA

S 0 A5 A4 A3 A2 A1 A0 1 A

DATA 1

READ FROM

PORT

START CONDITION

R/W ACKNOWLEDGE

FROM SLAVE

DATA FROM PORT

A

DATA 4

ACKNOWLEDGE

FROM MASTER

DATA INTO

PORT

INT

DATA 1

t iv

DATA 2

DATA 3

t ph

t ps

DATA 4

t ir

Figure 7. I/O READ mode (input)

1P

STOP

CONDITION

SW00650

2003 Sep 12

6

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