參數(shù)資料
型號(hào)： EVAL-AD7730LEB
廠商： Analog Devices, Inc.
英文描述： 10K RESISTOR 1/10 W
中文描述： 橋傳感器模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 15/52頁(yè)
文件大小： 497K
代理商： EVAL-AD7730LEB
AD7730/AD7730L
REV. A
–15–
Data Register (RS2–RS0 = 0, 0, 1); Power On/Reset Status: 000000 Hex
T he Data Register on the part is a read-only register which contains the most up-to-date conversion result from the AD7730. Fig-
ure5 shows a flowchart for reading from the registers on the AD7730. T he register can be programmed to be either 16 bits or 24bits
wide, determined by the status of the WL bit of the Mode Register. T he
RDY
output and
RDY
bit of the Status Register are set low
when the Data Register is updated. T he
RDY
pin and
RDY
bit will return high once the full contents of the register (either 16 bits or
24 bits) have been read. If the Data Register has not been read by the time the next output update occurs, the
RDY
pin and
RDY
bit
will go high for at least 100
×
t
CLK IN
, indicating when a read from the Data Register should not be initiated to avoid a transfer from
the Data Register as it is being updated. Once the updating of the Data Register has taken place,
RDY
returns low.
If the Communications Register data sets up the part for a write operation to this register, a write operation must actually take place
in order to return the part to where it is expecting a write operation to the Communications Register (the default state of the inter-
face). However, the 16 or 24 bits of data written to the part will be ignored by the AD7730.
Mode Register (RS2–RS0 = 0, 1, 0); Power On/Reset Status: 01B0 Hex
T he Mode Register is a 16-bit register from which data can be read or to which data can be written. T his register configures
the operating modes of the AD7730, the input range selection, the channel selection and the word length of the Data Register.
T able X outlines the bit designations for the Mode Register. MR0 through MR15 indicate the bit location, MR denoting the bits are
in the Mode Register. MR15 denotes the first bit of the data stream. T he number in brackets indicates the power-on/reset default
status of that bit. Figure 5 shows a flowchart for reading from the registers on the AD7730 and Figure 6 shows a flowchart for writ-
ing to the registers on the part.
T able X . Mode Register
MR15
MR14
MR13
MR12
MR11
MR10
MR9
MR8
MD2 (0)
MD1 (0)
MD0 (0)
B
/U (0)
DEN (0)
D1 (0)
D0 (0)
WL (1)
MR7
MR6
MR5
MR4
MR3
MR2
MR1
MR0
HIREF (1)
ZERO (0)
RN1 (1)
RN0 (1)
CLK DIS (0)
BO (0)
CH1 (0)
CH0 (0)
Bit
Location
Bit
Mnemonic
Description
MR15–MR13
MD2–MD0
Mode Bits. T hese three bits determine the mode of operation of the AD7730 as outlined in
T able X I. T he modes are independent, such that writing new mode bits to the Mode Register
will exit the part from the mode in which it is operating and place it in the new requested mode
immediately after the Mode Register write. T he function of the mode bits is described in more
detail below.
T able X I. Operating Modes
MD2
MD1
MD0
Mode of Operation
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
Sync (Idle) Mode
Continuous Conversion Mode
Single Conversion Mode
Power-Down (Standby) Mode
Internal Zero-Scale Calibration
Internal Full-Scale Calibration
System Zero-Scale Calibration
System Full-Scale Calibration
Power-On/Reset Default
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