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參數(shù)資料
| 型號： | AD7747 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 24-Bit Capacitance-to-Digital Converter with Temperature Sensor |
| 中文描述： | 24位的電容數(shù)字轉換器的溫度傳感器 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 200K |
| 代理商： | AD7747 |
Preliminary Technical Data
AD7747
CAP DAC A REGISTER
Address Pointer 0x0B, Default Value 0x00
Capacitive DAC setup.
Table 19. Cap DAC A Register Bit Map
Bit
Mnemonic
Default
Rev. PrC| Page 17 of 20
Bit 7
DACAENA
0
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
-
0
DACA—6-Bit Value
0x00
Table 20.
Bit
7
6
5-1
Mnemonic
DACAENA
-
DACA
Description
DACAENA = 1 connects capacitive DACA to the positive capacitance input.
This bit must be 0 for proper operation.
DACA value, Code 0x00
≈
0 pF, Code 0x3F
≈
full range.
CAP DAC B REGISTER
Address Pointer 0x0C, Default Value 0x00
Capacitive DAC setup.
Table 21. Cap DAC B Register Bit Map
Bit
Mnemonic
Default
Bit 7
DACAENB
0
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
-
0
DACB—6-Bit Value
0x00
Table 22.
Bit
7
6
5-1
Mnemonic
DACBENB
-
DACB
Description
DACBENB = 1 connects capacitive DACB to the negative capacitance input.
This bit must be 0 for proper operation.
DACB value, Code 0x00
≈
0 pF, Code 0x3F
≈
full range.
CAP OFFSET CALIBRATION REGISTER
16 Bits, Address Pointer 0x0D, 0x0E,
Default Value 0x8000
The capacitive offset calibration register holds the capacitive
channel zero-scale calibration coefficient. The coefficient is
used to digitally remove the capacitive channel offset. The
register value is updated automatically following the execution
of a capacitance offset calibration. The capacitive offset calibra-
tion resolution (cap offset register LSB) is less than TBD aF; the
full range is TBD pF.
CAP GAIN CALIBRATION REGISTER
16 Bits, Address Pointer 0x0F, 0x10,
Default Value 0xXXXX
Capacitive gain calibration register. The register holds the
capacitive channel full-scale factory calibration coefficient.
VOLT GAIN CALIBRATION REGISTER
16 Bits, Address Pointer 0x11,0x12,
Default Value 0xXXXX
Voltage gain calibration register. The register holds the voltage
channel full-scale factory calibration coefficient.
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