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ADT7470ARQ 数据表(PDF) 9 Page - Analog Devices

部件名 ADT7470ARQ
功能描述  Temperature Sensor Hub and Fan Controller
Download  40 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADT7470ARQ 数据表(HTML) 9 Page - Analog Devices

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Preliminary Technical Data
ADT7470
Rev. PrA | Page 9 of 40
1
00
1
1
1
A1
A0
R/W
99
1
1
D7
D6
D5
D4
D3
D2
D1
D0
9
D7
D6
D5
D4
D3
D2
D1
D0
SCL
SDA
SCL (CONTINUED)
SDA (CONTINUED)
START BY
MASTER
ACK. BY
ADT7470
ACK. BY
ADT7470
ACK. BY
ADT7470
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS
BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 3
DATA
BYTE
Figure 7. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
SCL
SDA
1
01
0
1
1
A1
A0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS
BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
STOP BY
MASTER
ACK. BY
ADT7470
ACK. BY
ADT7470
R/W
D7
D6
D5
D4
D3
D2
D1
D0
99
1
Figure 8. Writing to the Address Pointer Register Only
SCL
SDA
1
01
0
1
1
A1
A0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS
BYTE
FRAME 2
DATA BYTE FROM
ADT7470
STOP BY
MASTER
ACK. BY
ADT7470
NO ACK.
BY MASTER
R/W
D7
D6
D5
D4
D3
D2
D1
D0
99
1
Figure 9. Reading Data from a Previously Selected Register
In the case of the ADT7470, write operations contain either one
or two bytes, and read operations contain one byte, and perform
the following functions.
To write data to one of the device data registers or read data
from it, the address pointer register must be set so that the
correct data register is addressed, then data can be written into
that register or read from it. The first byte of a write operation
always contains an address that is stored in the address pointer
register. If data is to be written to the device, then the write
operation contains a second data byte that is written to the
register selected by the address pointer register.
This is illustrated in Figure 7. The device address is sent over the
bus followed by R/W set to 0. This is followed by two data bytes.
The first data byte is the address of the internal data register to
be written to, which is stored in the address pointer register. The
second data byte is the data to be written to the internal data
register.
When reading data from a register there are two possibilities:
If the ADT7470 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 ADT7470


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