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AD7294 bảng dữ liệu(PDF) 32 Page - Analog Devices

tên linh kiện AD7294
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AD7294 bảng dữ liệu(HTML) 32 Page - Analog Devices

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AD7294
Preliminary Technical Data
Rev. PrB | Page 32 of 45
WRITING/READING TO THE AD7294
The AD7294 uses the following I2C protocols:
Writing to the Address Pointer Register
for a Subsequent Read
In the AD7294, to read from a particular register, the address
pointer register must first contain the address of that register. If
the address pointer is not set, the correct address must be
written to the address pointer register by performing a single
byte write operation, as shown in Figure 29. In this operation,
the slave device receives a single byte from a master 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 (low) bit.
3.
The addressed slave device asserts ACK on SDA.
4.
The slave receives a data byte.
5.
The slave asserts ACK on SDA.
6.
The master asserts a stop condition on SDA, and the
transaction ends.
SDA
START BY
MASTER
ACK. BY
AD7294
ACK. BY
AD7294
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
19
1
9
P7
P6
P5
P2
P1
P0
A0
A1
A2
A3
A4
1
SCL
1
P4
P3
R/W
Figure 29. Writing to the Address Pointer Register to Select a Register for a Subsequent Read Operation



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