PCA9538 查看數據表（PDF） - Philips Electronics

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PCA9538

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

Philips Electronics 

Philips Semiconductors

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

with interrupt and reset

Product data sheet

PCA9538

Device address

SLAVE ADDRESS

1 1 1 0 0 A1 A0 R/W

FIXED

HARDWARE SELECTABLE

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.

1 2345 6 78 9

SCL

slave address

command byte

data to port

SDA S 1 1 1 0 0 A1 A0 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 6. WRITE to output port register

AP

acknowledge

from slave

DATA 1 VALID

tpv

SW02176

1 2345 6 78 9

SCL

slave address

command byte

data to register

SDA S 1 1 1 0 0 A1 A0 0 A 0 0 0 0 0 0 1 1/0 A

start condition

DATA TO

REGISTER

R/W acknowledge

from slave

acknowledge

from slave

DATA

Figure 7. WRITE to configuration or polarity inversion registers

AP

acknowledge

from slave

SW02177

2004 Oct 05

6

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