MaxTech NXP-16 Manual de usuario descargar pdf (Pagina 12)

Product data sheet Rev. 04 — 17 March 2009 12 of 29

NXP Semiconductors

PCA9532

16-bit I

C-bus LED dimmer

7.4 Bus transactions

Fig 11. Write to register

0 AS

slave address

START condition R/W acknowledge

from slave

002aae526

0 0 AI B3 B2 B1 B00

command byte

acknowledge

from slave

12345678SCL 9

SDA DATA 1 A

write to register

data out from port

v(Q)

acknowledge

from slave

DATA 1 VALID

data to register

1 0 0 A2 A1 A01

Fig 12. Read from register

1 0 0 A2 A1 A0 0 AS1

START condition R/W

acknowledge

from slave

002aae527

acknowledge

from slave

SDA

A P

acknowledge

from master

data from register

DATA (first byte)

slave address

STOP

condition

(repeated)

START condition

(cont.)

1 A

R/W

acknowledge

from slave

slave address

at this moment master-transmitter becomes master-receiver

and slave-receiver becomes slave-transmitter

no acknowledge

from master

data from register

DATA (last byte)

command byte

0 0 AI B3 B2 B10B0

Auto-Increment

if AI = 1

1 0 0 A2 A1 A01

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

Fig 13. Read input port register

1 0 0 A2 A1 A0 1 AS1

START condition R/W acknowledge

from slave

002aae528

acknowledge

from master

SDA NA

read from

port

data into

port

h(D)

data from port

no acknowledge

from master

data from port

DATA 4

slave address

DATA 1

STOP

condition

DATA 2 DATA 3 DATA 4

su(D)

DATA 1

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 28 29

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MaxTech NXP-16 Manual de usuario Pagina 12

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