9532 데이터 시트보기 (PDF) - NXP Semiconductors.

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9532

16-bit I²C-bus LED dimmer

NXP Semiconductors. 

NXP Semiconductors

7.4 Bus transactions

PCA9532

16-bit I2C-bus LED dimmer

SCL 1 2 3 4 5 6 7 8 9

slave address

command byte

data to register

SDA S 1 1 0 0 A2 A1 A0 0 A 0 0 0 AI B3 B2 B1 B0 A

DATA 1

A

START condition

write to register

data out from port

Fig 11. Write to register

R/W acknowledge

from slave

acknowledge

from slave

acknowledge

from slave

tv(Q)

DATA 1 VALID

002aae526

slave address

command byte

SDA S 1 1 0 0 A2 A1 A0 0 A 0 0 0 AI B3 B2 B1 B0 A (cont.)

START condition

R/W

acknowledge

from slave

slave address

(cont.) S 1 1 0 0 A2 A1 A0 1 A

(repeated)

START condition

R/W

acknowledge

from slave

Fig 12. Read from register

acknowledge

from slave

data from register

data from register

DATA (first byte)

A

DATA (last byte)

NA P

Auto-Increment

register address

if AI = 1

acknowledge

from master

no acknowledge STOP

from master condition

at this moment master-transmitter becomes master-receiver

and slave-receiver becomes slave-transmitter

002aae527

slave address

data from port

data from port

SDA S 1 1 0 0 A2 A1 A0 1 A

DATA 1

A

DATA 4

START condition

read from

port

data into

port

DATA 1

R/W acknowledge

from slave

acknowledge

from master

th(D)

DATA 2 DATA 3

tsu(D)

DATA 4

Remark: This figure assumes the command byte has previously been programmed with 00h.

Fig 13. Read input port register

no acknowledge

from master

NA P

STOP

condition

002aae528

PCA9532_4

Product data sheet

Rev. 04 — 17 March 2009

© NXP B.V. 2009. All rights reserved.

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