ADT7462ZEVB【PDF 16/82 页】BOARD EVALUATION FOR ADT7462

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ADT7462

the data byte read from the data register

(see Figure 26).

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

the desired address, data can be read from the

corresponding data register without first writing to the

address pointer register (see Figure 26).

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.

However, 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 ADT7462 also supports the read byte protocol

(see System Management Bus Specifications Rev. 2.0 for

more information).

If several read or write operations must be performed in

succession, then the master can send a repeat start condition,

instead of a stop condition, to begin a new operation.

1

9

1

9

SCL

SDA

A6

A5

A4

A3

A2

A1

A0

R/W

D7

D6

D5

D4

D3

D2

D1

D0

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK. BY

ADT7462

1

FRAME 2

ADDRESS POINTER REGISTER BYTE

9

ACK. BY

ADT7462

SCL (CONTINUED)

SDA (CONTINUED)

D7

D6

D5

D4

D3

D2

D1

D0

FRAME 3

DATA BYTE

ACK. BY

ADT7462

STOP BY

MASTER

Figure 24. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register

1

9

1

9

SCL

SDA

A6

A5

A4

A3

A2

A1

A0

R/W

D7

D6

D5

D4

D3

D2

D1

D0

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK. BY

ADT7462

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

ADT7462

STOP BY

MASTER

Figure 25. Writing to the Address Pointer Register Only

1

9

1

9

SCL

SDA

A6

A5

A4

A3

A2

A1

A0

R/W

D7

D6

D5

D4

D3

D2

D1

D0

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS BYTE

ACK. BY

ADT7462

FRAME 2

DATA BYTE FROM ADT7462

NO ACK.

BY MASTER

STOP BY

MASTER

Figure 26. Reading Data from a Previously Selected Register

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