ADT7463ARQZ-R7 datasheet(11/52 Pages) ONSEMI

11 / 52 page

REV. C

ADT7463

–11–

When reading data from a register, there are two possibilities:

1. If the ADT7463’s address pointer register value is unknown

or not the desired value, it is first necessary to set it to the

correct value before data can be read from the desired data

as before, however, only the data byte is sent and this con-

tains the register address. This is shown in Figure 8.

A read operation is then performed consisting of the serial

bus address, R/W bit set to 1, followed by the data byte read

from the data register. This is shown in Figure 9.

2. If the address pointer register is already at the desired address,

data can be read from the corresponding data register without

first writing to the address pointer register, so Figure 8 can

be omitted.

Notes

1. 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.

2. In Figures 7 to 9, the serial bus address is shown as the

default value 01011(A1)(A0), where A1 and A0 are set by

the address select mode function previously defined.

3. In addition to supporting the Send Byte and Receive Byte

protocols, the ADT7463 also supports the Read Byte protocol

(see System Management Bus specifications Rev. 2.0 for

more information).

4. 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.

R/W

SCL

SDA

ACK. BY

ADT7463

STOP BY

MASTER

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS

BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

ADT7463

Figure 8. Writing to the Address Pointer Register Only

R/W

SCL

SDA

NO ACK. BY

MASTER

STOP BY

MASTER

START BY

MASTER

FRAME 1

SERIAL BUS ADDRESS

BYTE

FRAME 2

DATA BYTE FROM ADT7463

ACK. BY

ADT7463

Figure 9. Reading Data from a Previously Selected Register

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