PCA9539 查看數據表（PDF） - Philips Electronics

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PCA9539

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

Philips Electronics 

SCL

123456789

I0.x

SDA S 1 1 1 0 1 A1 A0 1 A

DATA 00

READ FROM PORT 0

R/W ACKNOWLEDGE

FROM SLAVE

tph

I1.x

A

DATA 10

ACKNOWLEDGE

FROM MASTER

I0.x

A

DATA 03

ACKNOWLEDGE

FROM MASTER

tps

I1.x

A

DATA 12

1P

ACKNOWLEDGE

FROM MASTER

NON ACKNOWLEDGE

FROM MASTER

DATA INTO PORT 0

READ FROM PORT 1

DATA INTO PORT 1

DATA 00

DATA 01

DATA 10

DATA 02

tph

DATA 11

DATA 03

tps

DATA 12

INT

tIV

tIR

SW02209

NOTES: Transfer of data can be stopped at any moment by a STOP condition. When this occurs, data present at the latest acknowledge phase is valid (output mode).

It is assumed that the command byte has previously been set to 00 (read input port port register).

Figure 10. READ input port register — scenario 2

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