PCA9537 查看數據表（PDF） - Philips Electronics

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PCA9537

4-bit I2C and SMBus low power I/O port with interrupt and reset

Philips Electronics 

Philips Semiconductors

4-bit I2C and SMBus low power I/O port

with interrupt and reset

Product data sheet

PCA9537

Device address

SLAVE ADDRESS

1 0 0 1 0 0 1 R/W

FIXED

SW02184

Figure 4. PCA9537 address

Bus transactions

Data is transmitted to the PCA9537 registers using the write mode as shown in Figures 5 and 6. Data is read from the PCA9537 registers using

the read mode as shown in Figures 7 and 8. 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.

1 2345 6 78 9

SCL

slave address

command byte

data to port

SDA S 1 0 0 1 0 0 1 0 A 0 0 0 0 0 0 0 1 A

start condition

R/W acknowledge

from slave

acknowledge

from slave

WRITE TO

PORT

DATA 1

DATA OUT

FROM PORT

Figure 5. WRITE to output port register

AP

acknowledge

from slave

DATA 1 VALID

tpv

SW02185

1 2345 6 78 9

SCL

slave address

command byte

data to register

SDA S 1 0 0 1 0 0 1 0 A 0 0 0 0 0 0 1 1/0 A

start condition

R/W acknowledge

from slave

acknowledge

from slave

DATA TO

REGISTER

DATA

Figure 6. WRITE to configuration or polarity inversion registers

Expanded diagram found on page 13, Figure 16.

AP

acknowledge

from slave

SW02186

2004 Nov 29

6

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