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參數(shù)資料
| 型號： | ADM1023ARQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封裝： | MO-137AB, QSOP-16 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 170K |
| 代理商： | ADM1023ARQ |
ADM1023
–10–
REV. A
In the case of the ADM1023, write operations contain either
one or two bytes, while 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
fi
rst 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 regis-
ter selected by the address pointer register.
This is illustrated in Figure 14. The device address is sent over
the bus followed by R/
W
set to 0. This is followed by two data
bytes. The
fi
rst 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:
1. If the ADM1023
’
s Address Pointer Register value is unknown,
or not the desired value, it is
fi
rst 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 ADM1023
as before, but only the data byte containing the register read
address is sent, as data is not to be written to the register.
This is shown in Figure 15.
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 15.
2. If the Address Pointer Register is known to be already at the
desired address, data can be read from the corresponding
data register without
fi
rst writing to the Address Pointer Reg-
ister, so Figure 15 can be omitted.
NOTES
1. Although it is possible to read a data byte from a data register
without
fi
rst writing to the Address Pointer Register, if the
Address Pointer Register is already at the correct value, it is
not possible to write data to a register without writing to the
Address Pointer Register, because the
fi
rst data byte of a write is
always written to the Address Pointer Register.
2. Do not forget that ADM1023 registers have different addresses
for read and write operations. The write address of a register
must be written to the Address Pointer if data is to be written
to that register, but it is not possible to read data from that
address. The read address of a register must be written to
the Address Pointer before data can be read from that register.
R/
W
0
SCLK
SDATA
1
0
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1023
START BY
MASTER
1
9
1
ACK. BY
ADM1023
9
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1023
STOP BY
MASTER
1
9
SCLK (CONTINUED)
SDATA (CONTINUED)
FRAME 3
DATA BYTE
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
Figure 14. Writing a Register Address to the Address Pointer Register, then Writing Data to the Selected Register
R/
W
0
SCLK
SDATA
1
0
1
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1023
START BY
MASTER
1
9
1
ACK. BY
ADM1023
9
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
STOP BY
MASTER
Figure 15. Writing to the Address Pointer Register Only
R/
W
SCLK
SDATA
D7
D6
D5
D4
D3
D2
D1
D0
NO ACK.
BY MASTER
START BY
MASTER
9
1
ACK. BY
ADM1023
9
FRAME 1
SERIAL BUS ADDRESS BYTE
STOP BY
MASTER
A6
A5
A4
A3
A2
A1
A0
FRAME 2
DATA BYTE FROM ADM1023
1
Figure 16. Reading Data from a Previously Selected Register
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