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ADT7460 数据表(PDF) 11 Page - ON Semiconductor

部件名 ADT7460
功能描述  dBCOOL Remote Thermal Monitor and Fan Controller
Download  46 Pages
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制造商  ONSEMI [ON Semiconductor]
网页  http://www.onsemi.com
标志 ONSEMI - ON Semiconductor

ADT7460 数据表(HTML) 11 Page - ON Semiconductor

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ADT7460
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Figure 17. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
R/W
0
SCL
SDA
1
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADT7460
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS
BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
1
1
ACK. BY
ADT7460
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADT7460
STOP BY
MASTER
FRAME 3
DATA
BYTE
1
9
SCL (CONTINUED)
SDA (CONTINUED)
0
9
When reading data from a register, there are two
possibilities:
If the ADT7460’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 register. This is
done by performing a write to the ADT7460 as
before, but only the data byte containing the register
address is sent because data is not to be written to
the register. This is shown in Figure 18.
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 19.
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, so Figure 18 can be
omitted.
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 Figure 17 and Figure 19, 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.
In addition to supporting the Send Byte and Receive Byte
protocols, the ADT7460 also supports the Read Byte
protocol (see System Management Bus specifications
Rev. 2.0 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.
Write Operations
The SMBus specification defines several protocols for
different types of read and write operations. The ones used
in the ADT7460 are discussed below. The following
abbreviations are used in the diagrams:
S—start
P—stop
R—read
W—write
A—acknowledge
A—no acknowledge
The ADT7460 uses the following SMBus write protocols:
Send Byte
In this operation, the master device sends a single
command byte to a slave device as follows:
1. The master device asserts a start condition on SDA.
2. The master sends the 7−bit slave address followed
by the write bit (low).
3. The addressed slave device asserts ACK on SDA.
4. The master sends the register address.
5. The slave asserts ACK on SDA.
6. The master asserts a stop condition on SDA and
the transaction ends.


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