ADT7466 Просмотр технического описания (PDF) - ON Semiconductor

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ADT7466

dBCool® Remote Thermal Controller and Voltage Monitor

ON Semiconductor 

ADT7466

If the address pointer register is known to already be at the

desired address, data can be read from the corresponding data

register without first writing to the address pointer register, so

the procedure in Figure 18 can be omitted.

1

9

1

9

SCL

SDA

1

START BY

MASTER

0

0

1

1

0

0

FRAME 1

SERIAL BUS ADDRESS BYTE

R/W

D7

ACK. BY

ADT7466

1

SCL (CONTINUED)

D6 D5 D4 D3 D2 D1 D0

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

ADT7466

9

SDA (CONTINUED)

D7 D6 D5 D4 D3 D2 D1 D0

FRAME 3 DATA BYTE

ACK. BY STOP BY

ADT7466 MASTER

Figure 17. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register

1

9

1

9

SCL

SDA

1

START BY

MASTER

0

0

1

1

0

0

FRAME 1

SERIAL BUS ADDRESS BYTE

R/W

D7

ACK. BY

ADT7466

D6 D5 D4 D3 D2 D1 D0

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY STOP BY

ADT7466 MASTER

Figure 18. Writing to the Address Pointer Register Only

1

9

1

9

SCL

SDA

1

START BY

MASTER

0

0

1

1

0

0

FRAME 1

SERIAL BUS ADDRESS BYTE

R/W

D7

ACK. BY

ADT7466

D6 D5 D4 D3 D2 D1 D0

FRAME 2

ADDRESS POINTER REGISTER BYTE

NO ACK. BY STOP BY

MASTER MASTER

Figure 19. Reading Data from a Previously Selected Register

Although it is possible to read a data byte from a data register

without first writing to the address pointer register if the

address pointer register is already at the correct value, it is not

possible to write data to a register without writing to the address

pointer register, because the first data byte of a write is always

written to the address pointer register.

In addition to supporting the send byte and receive byte

protocols, the ADT7466 also supports the read byte protocol

(see the SMBus Specifications Rev. 1.1 for more information).

If it is required to perform several read or write operations in

succession, the master can send a repeat start condition instead

of a stop condition to begin a new operation.

Rev. 3 | Page 13 of 48 | www.onsemi.com

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