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參數(shù)資料
| 型號(hào)： | EVAL-AD7746EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7746 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 傳感器類型： | 觸摸，電容式 |
| 接口： | I²C |
| 電源電壓： | 2.7 V ~ 5.25 V |
| 嵌入式： | 否 |
| 已供物品： | 板，纜線，CD |
| 已用 IC / 零件： | AD7746 |
| 產(chǎn)品目錄頁面： | 781 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | AD7746ARUZ-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP AD7746ARUZ-REEL7-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP AD7746ARUZ-REEL-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP |
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AD7745/AD7746
Rev. 0 | Page 16 of 28
CAP SET-UP REGISTER
Address Pointer 0x07, Default Value 0x00
Capacitive channel setup.
Table 11. CAP Set-Up Register Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
CAPEN
CIN2
CAPDIFF
-
CAPCHOP
Default
0
Table 12.
Bit
Mnemonic
Description
7
CAPEN
CAPEN = 1 enables capacitive channel for single conversion, continuous conversion, or calibration.
6
CIN2
CIN2 = 1 switches the internal multiplexer to the second capacitive input on the AD7746.
5
CAPDIFF
DIFF = 1 sets differential mode on the selected capacitive input.
4-1
-
These bits must be 0 for proper operation.
0
CAPCHOP
The CAPCHOP bit should be set to 0 for the specified capacitive channel performance.
CAPCHOP = 1 approximately doubles the capacitive channel conversion times and slightly improves the
capacitive channel noise performance for the longest conversion times.
VT SET-UP REGISTER
Address Pointer 0x08, Default Value 0x00
Voltage/Temperature channel setup.
Table 13. VT Set-Up Register Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
VTEN
VTMD1
VTMD0
EXTREF
-
VTSHORT
VTCHOP
Default
0
Table 14.
Bit
Mnemonic
Description
7
VTEN
VTEN = 1 enables voltage/temperature channel for single conversion, continuous conversion, or calibration.
Voltage/temperature channel input configuration.
VTMD1
VTMD0
Channel Input
0
Internal temperature sensor
0
1
External temperature sensor diode
1
0
VDD monitor
6
5
VTMD1
VTMD0
1
External voltage input (VIN)
4
EXTREF
EXTREF = 1 selects an external reference voltage connected to REFIN(+), REFIN(–) for the voltage input or the
VDD monitor.
EXTREF = 0 selects the on-chip internal reference. The internal reference must be used with the internal
temperature sensor for proper operation.
3-2
-
These bits must be 0 for proper operation.
1
VTSHORT
VTSHORT = 1 internally shorts the voltage/temperature channel input for test purposes.
0
VTCHOP = 1
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.
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