ATMEGA3250V-8AI【PDF 22/29 页】IC AVR MCU 32K 8MHZ 100TQFP

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PCA9698

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Product data sheet

Rev. 3 — 3 August 2010

29 of 48

NXP Semiconductors

PCA9698

40-bit Fm+ I2C-bus advanced I/O port with RESET, OE and INT

If AI = 0 or 1, the same register is read during the all sequence.

Fig 20. Read from output structure configuration, all bank control or mode selection registers

002aab949

S A6 A5 A4 A3 A2 A1 A0 0 A

slave address

R/W

START condition

command register

AI = 'don't care'

acknowledge

from slave

no acknowledge

from master

acknowledge

from slave

STOP

condition

SDA

01010 D1 D0

00 for output structure configuration register reading

01 for for all bank control register reading

10 for mode selection register reading

repeated START

condition

A6 A5 A4 A3 A2 A1 A0

slave address

1 A

R/W

acknowledge

from slave

data from register

DATA

last byte

At this moment master-transmitter

becomes master-receiver, and

slave-receiver becomes slave-transmitter.

Fig 21. SMBus Alert procedure

002aab950

A6 A5 A4 A3 A2 A1 A0 0

PCA9698 I2C-bus

slave address

R/W

no acknowledge

from master

STOP condition

SMBus Alert

response address

START condition

1 A

R/W

acknowledge from slave

that generated the alert

At this moment master-transmitter

becomes master-receiver and

slave receiver becomes slave-transmitter.

SMBALERT

SMBALERT signal is released

(assuming that only one device

generated the alert)

If more than 3 bytes are read, the slave device loops back to the first byte (manufacturer byte) and keeps sending data until the

master generates a ‘No Acknowledge’.

Fig 22. Device ID field reading

002aab951

A6 A5 A4 A3 A2 A1 A0

I2C-bus slave address

of the device to be identified

no acknowledge

from master

STOP condition

M9 M8 M7 M6 M5 M4

repeated START

condition

1 A

R/W

Device ID address

START condition

0 A

R/W

acknowledge from

one or several slaves

0 A

don't care

acknowledge from

slave to be identified

Device ID address

acknowledge from

slave to be identified

A M3 M2 M1 M0

acknowledge

from master

manufacturer name = 000000000000

P8 P7 P6 P5 A

acknowledge

from master

P4 P3 P2 P1 P0 R2 R1 R0

part identification = 000000000

revision = 000

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