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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(zhuǎn)換器的溫度傳感器 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大?。?/td> | 200K |
| 代理商： | AD7747 |
AD7747
Preliminary Technical Data
CAP SET-UP REGISTER
Address Pointer 0x07, Default Value 0x00
Capacitive channel setup.
Table 11. CAP Set-Up Register Bit Map
Bit
Mnemonic
Default
Rev. PrC | Page 14 of 20
Bit 7
CAPEN
0
Bit 6
-
0
Bit 5
CAPDIFF
0
Bit 4
-
0
Bit 3
-
0
Bit 2
-
0
Bit 1
-
0
Bit 0
-
0
Table 12.
Bit
7
6
5
4-0
Mnemonic
CAPEN
-
CAPDIFF
-
Description
CAPEN = 1 enables capacitive channel for single conversion, continuous conversion, or calibration.
This bit must be 0 for proper operation.
DIFF = 1 sets differential mode on the selected capacitive input.
These bits must be 0 for proper operation.
VT SET-UP REGISTER
Address Pointer 0x08, Default Value 0x00
Voltage/Temperature channel setup.
Table 13. VT Set-Up Register Bit Map
Bit
Mnemonic
Default
Bit 7
VTEN
0
Bit 6
VTMD1
0
Bit 5
VTMD0
0
Bit 4
EXTREF
0
Bit 3
-
0
Bit 2
-
0
Bit 1
VTSHORT
0
Bit 0
VTCHOP
0
Table 14.
Bit
7
6
5
Mnemonic
VTEN
VTMD1
VTMD0
Description
VTEN = 1 enables voltage/temperature channel for single conversion, continuous conversion, or calibration.
Voltage/temperature channel input configuration.
VTMD1
0
0
1
1
EXTREF = 1 selects an external reference voltage connected to REFIN(+), REFIN(–) for the voltage input or the
V
DD
monitor.
EXTREF = 0 selects the on-chip internal reference. The internal reference must be used with the internal
temperature sensor for proper operation.
These bits must be 0 for proper operation.
VTSHORT = 1 internally shorts the voltage/temperature channel input for test purposes.
VTCHOP = 1 sets internal chopping on the voltage/temperature channel.
The VTCHOP bit must be set to 1 for the specified voltage/temperature channel performance.
VTMD0
0
1
0
1
Channel Input
Internal temperature sensor
External temperature sensor diode
V
DD
monitor
External voltage input (VIN)
4
EXTREF
3-2
1
0
-
VTSHORT
VTCHOP = 1
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