參數(shù)資料
型號: AD7746ARUZ-REEL
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): 17/28頁
文件大?。?/td> 391K
代理商: AD7746ARUZ-REEL
AD7745/AD7746
EXC SET-UP REGISTER
Address Pointer 0x09, Default Value 0x03
Capacitive channel excitation setup.
Table 15. EXC Set-Up Bit Map
Bit
Mnemonic
Default
Rev. 0| Page 17 of 28
Bit 7
CLKCTRL
0
Bit 6
EXCON
0
Bit 5
EXCB
0
Bit 4
EXCB
0
Bit 3
EXCA
0
Bit 2
EXCA
0
Bit 1
EXCLVL1
0
Bit 0
EXCLVL0
0
Table 16.
Bit
7
Mnemonic
CLKCTRL
Description
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.
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.
EXCB = 1 enables EXCB pin as the excitation output.
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.
EXCA = 1 enables EXCA pin as the excitation output.
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.
6
EXCON
5
4
EXCB
EXCB
3
2
EXCA
EXCA
EXCLVL1
0
0
1
1
EXCLVL0
0
1
0
1
Voltage on Cap
±V
DD
/8
±V
DD
/4
±V
DD
× 3/8
±V
DD
/2
EXC Pin Low Level
V
DD
× 3/8
V
DD
× 1/4
V
DD
× 1/8
0
EXC Pin High Level
V
DD
× 5/8
V
DD
× 3/4
V
DD
× 7/8
V
DD
1
0
EXCLVL1,
EXCLVL0
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