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參數(shù)資料
| 型號： | AD7713ARZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 24BIT SIGMA-DELTA 24SOIC |
| 標準包裝： | 1,000 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 205 |
| 數(shù)據(jù)接口： | 串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 5.5mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 24-SOIC W |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個單端，單極；1 個差分，單極；1 個差分，雙極 |
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REV. D
–22–
AD7713
MICROCOMPUTER/MICROPROCESSOR INTERFACING
The AD7713’s flexible serial interface allows easy interface to
most microcomputers and microprocessors. Figure 15 shows a
flowchart diagram for a typical programming sequence for read-
ing data from the AD7713 to a microcomputer, while Figure 16
shows a flowchart diagram for writing data to the AD7713.
Figures 17 and 18 show some typical interface circuits.
The flowchart in Figure 15 is for continuous read operations
from the AD7713 output register. In the example shown, the
DRDY line is continuously polled. Depending on the micropro-
cessor configuration, the
DRDY line may come to an interrupt
input, in which case the
DRDY will automatically generate an
interrupt without being polled. Reading the serial buffer could
be anything from one read operation up to three read operations
(where 24 bits of data are read into an 8-bit serial register). A
read operation to the control/calibration registers is similar, but,
in this case, the status of
DRDY can be ignored. The A0 line is
brought low when the
RFS line is brought low when reading
from the control register.
CONFIGURE AND
INITIALIZE
C/ P
SERIAL PORT
BRING
RFS LOW
POLL
DRDY
BRING
RFS,TFS
AND HIGH
START
3
BRING
RFS HIGH
READ SERIAL BUFFER
REVERSE ORDER
OF BITS
DRDY
LOW?
YES
NO
Figure 15. Flowchart for Continuous Read Operation
to the AD7713
The flowchart also shows the bits being reversed after they have
been read in from the serial port. This depends on whether the
microprocessor expects the MSB of the word first or the LSB of
the word first. The AD7713 outputs the MSB first.
The flowchart in Figure 16 is for a single 24-bit write operation
to the AD7713 control or calibration registers. This shows data
being transferred from data memory to the accumulator before
being written to the serial buffer. Some microprocessor systems
will allow data to be written directly to the serial buffer from data
memory. Writing data to the serial buffer from the accumulator
will generally consist of either two or three write operations,
depending on the size of the serial buffer.
The flowchart also shows the option of the bits being reversed
before being written to the serial buffer. This depends on whether
the first bit transmitted by the microprocessor is the MSB or the
LSB. The AD7713 expects the MSB as the first bit in the data
stream. In cases where the data is being read or being written in
bytes and the data has to be reversed, the bits will have to be
reversed for every byte.
CONFIGURE AND
INITIALIZE
C/ P
SERIAL PORT
BRING
RFS AND A0 LOW
BRING
RFS,TFS
AND A0 HIGH
START
END
3
LOAD DATA FROM
ADDRESS TO
ACCUMULATOR
WRITE DATA FROM
ACCUMULATOR TO
SERIAL BUFFER
BRING
TFS AND A0 HIGH
REVERSE ORDER
OF BITS
Figure 16. Flowchart for Single Write Operation to
the AD7713
AD7713 to 8XC51 Interface
Figure 17 shows an interface between the AD7713 and the 8XC51
microcontroller. The AD7713 is configured for its external clock-
ing mode, while the 8XC51 is configured in its Mode 0 serial
interface mode. The
DRDY line from the AD7713 is connected to
the Port P1.2 input of the 8XC51, so the
DRDY line is polled by
the 8XC51. The
DRDY line can be connected to the INT1 input
of the 8XC51 if an interrupt driven system is preferred.
RFS
AD7713
SDATA
SCLK
TFS
A0
P1.0
P3.0
P3.1
P1.1
P1.2
MODE
DRDY
P1.3
SYNC
DVDD
8XC51
Figure 17. AD7713 to 8XC51 Interface
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