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參數(shù)資料
| 型號(hào)： | EVAL-AD7746EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/28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 17 of 28
EXC SET-UP REGISTER
Address Pointer 0x09, Default Value 0x03
Capacitive channel excitation setup.
Table 15. EXC Set-Up Bit Map
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Mnemonic
CLKCTRL
EXCON
EXCB
EXCA
EXCLVL1
EXCLVL0
Default
0
Table 16.
Bit
Mnemonic
Description
7
CLKCTRL
The CLKCTRL bit should be set to 0 for the specified AD7745/AD7746 performance.
CLKCTRL = 1 decreases the excitation signal frequency and the modulator clock frequency by factor of 2.
This also increases the conversion time on all channels (capacitive, voltage, and temperature) by a factor of 2.
6
EXCON
When EXCON = 0, the excitation signal is present on the output only during capacitance channel conversion.
When EXCON = 1, the excitation signal is present on the output during both capacitance and
voltage/temperature conversion.
5
EXCB
EXCB = 1 enables EXCB pin as the excitation output.
4
EXCB
EXCB = 1 enables EXCB pin as the inverted excitation output.
Only one of the EXCB or the EXCB bits should be set for proper operation.
3
EXCA
EXCA = 1 enables EXCA pin as the excitation output.
2
EXCA
EXCA = 1 enables EXCA pin as the inverted excitation output.
Only one of the EXCA or the EXCA bits should be set for proper operation.
Excitation Voltage Level.
EXCLVL1
EXCLVL0
Voltage on Cap
EXC Pin Low Level
EXC Pin High Level
0
±VDD/8
VDD × 3/8
VDD × 5/8
0
1
±VDD/4
VDD × 1/4
VDD × 3/4
1
0
±VDD × 3/8
VDD × 1/8
VDD × 7/8
1
0
EXCLVL1,
EXCLVL0
1
±VDD/2
0
VDD
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