参数资料
型号: AD7746
厂商: ANALOG DEVICES INC
元件分类: 温度/湿度传感器
英文描述: DIGITAL TEMP SENSOR-SERIAL, 24BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT
封装: MO-153AB, TSSOP-16
文件页数: 5/17页
文件大小: 232K
代理商: AD7746
Preliminary Technical Data
AD7745/AD7746
Rev. PrF | Page 13 of 17
EXC SETUP REGISTER
Address pointer 0x09, default value 0x03
Capacitive channel excitation setup.
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
Bit
Mnemonic
Description
7
CLKCTRL
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 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 / tem-
perature 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.
1
0
EXCLVL1,
EXCLVL0
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
±VDD/2
0
VDD
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