EVAL-AD7747EBZ Analog Devices Inc, EVAL-AD7747EBZ Datasheet - Page 16

• Manufacturer Part Number: EVAL-AD7747EBZ
• Description: 24-Bit Capacitance-to-Digital Converter Eval. Board
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7747EBZ

• Silicon Manufacturer: Analog Devices
• Application Sub Type: Capacitance-to-Digital Converter
• Kit Application Type: Data Converter
• Silicon Core Number: AD7747
• Sensor Type: Touch, Capacitive
• Interface: I²C
• Voltage - Supply: 2.7 V ~ 5.25 V
• Embedded: No
• Utilized Ic / Part: AD7747
• Kit Contents: Board
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -
• Sensing Range: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

AD7747
CAP SETUP REGISTER
Address Pointer 0x07, Default Value 0x00
Capacitive channel setup.
Table 11. Cap Setup Register Bit Map
Bit
Mnemonic
Default
Table 12.
Bit
7
6
5
4 to 0
VT SETUP REGISTER
Address Pointer 0x08, Default Value 0x00
Voltage/Temperature channel setup.
Table 13. VT Setup Register Bit Map
Bit
Mnemonic
Default
Table 14.
Bit
7
6
5
4
3 to 2
1
0
Mnemonic
CAPEN
–
CAPDIFF
–
Mnemonic
VTEN
VTMD1
VTMD0
EXTREF
–
VTSHORT
VTCHOP = 1
Bit 7
Description
CAPEN = 1 enables capacitive channel for single conversion, continuous conversion, or calibration.
This bit must be 0 for proper operation.
This bit must be set to 1 for proper operation.
These bits must be 0 for proper operation.
Bit 7
VTEN
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
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.
CAPEN
0
0
DD
monitor.
VTMD0
0
1
0
1
Bit 6
–
0
Bit 6
VTMD1
0
Channel Input
Internal temperature sensor
External temperature sensor diode
V
External voltage input (VIN)
DD
monitor
Bit 5
CAPDIFF
0
Bit 5
VTMD0
0
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Bit 4
–
0
Bit 4
EXTREF
0
Bit 3
–
0
Bit 3
–
0
Bit 2
–
0
Bit 2
–
0
Bit 1
Bit 1
–
0
VTSHORT
0
Bit 0
–
0
Bit 0
VTCHOP
0