參數(shù)資料
型號(hào): ADT7461AARMZ-2RL7
廠商: ON SEMICONDUCTOR
元件分類(lèi): 溫度/濕度傳感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 2.5Cel, SQUARE, SURFACE MOUNT
封裝: LEAD FREE MSOP-8
文件頁(yè)數(shù): 5/19頁(yè)
文件大小: 276K
代理商: ADT7461AARMZ-2RL7
ADT7461A
http://onsemi.com
13
transmitted over the serial bus in a single read or
write operation is limited only by what the master
and slave devices can handle.
3. When all data bytes have been read or written,
stop conditions are established. In write mode, the
master pulls the data line high during the tenth
clock pulse to assert a stop condition. In read
mode, the master device overrides the
acknowledge bit by pulling the data line high
during the low period before the ninth clock pulse.
This is known as no acknowledge. The master
takes the data line low during the low period
before the tenth clock pulse, then high during the
tenth clock pulse to assert a stop condition.
Any number of bytes of data are transferable over
the serial bus in one operation, but it is not
possible to mix read and write in one operation
because the type of operation is determined at the
beginning and cannot subsequently be changed
without starting a new operation. For the
ADT7461A, write operations contain either one or
two bytes, while read operations contain one byte.
To write data to one of the device data registers, or to read
data from it, the address pointer register must be set so that
the correct data register is addressed. The first byte of a write
operation always contains a valid address that is stored in the
address pointer register. If data is to be written to the device,
the write operation contains a second data byte that is written
to the register selected by the address pointer register.
This procedure is illustrated in Figure 15. 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.
Figure 15. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
Figure 16. Writing to the Address Pointer Register Only
Figure 17. Reading from a Previously Selected Register
D7
D6
D5
D4
D3
D2
D1
D0
FRAME 3
DATA BYTE
ACK. BY
ADT7461A
STOP BY
MASTER
SDATA (CONTINUED)
SCLK (CONTINUED)
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADT7461A
SDATA
SCLK
START BY
MASTER
FRAME 2
ADDRESS POINTER REGISTER BYTE
D7
D6
D5
D4
D3
D2
D1
D0
A6
A5
A4
A3
A2
A1
A0
R/W
ACK. BY
ADT7461A
1
9
1
9
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADT7461A
SDATA
SCLK
START BY
MASTER
FRAME 2
ADDRESS POINTER REGISTER BYTE
D7
D6
D5
D4
D3
D2
D1
D0
A6
A5
A4
A3
A2
A1
A0
R/W
ACK. BY
ADT7461A
1
9
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADT7461A
SDATA
SCLK
START BY
MASTER
FRAME 2
ADDRESS POINTER REGISTER BYTE
D7
D6
D5
D4
D3
D2
D1
D0
A6
A5
A4
A3
A2
A1
A0
R/W
ACK. BY
ADT7461A
1
9
STOP BY
MASTER
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