AD7150 Analog Devices, AD7150 Datasheet - Page 19

• Manufacturer Part Number: AD7150
• Description: Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing
• Manufacturer: Analog Devices

Specifications of AD7150

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: n/a
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: 0.5 pF,1 pF,2 pF,4 pF
• Adc Architecture: Sigma-Delta
• Pkg Type: SOP

CONFIGURATION REGISTER
Address Pointer 0x0F
8 Bits, Read/Write, Factory Preset 0x19
Table 12. Configuration Register Bit Map
Bit
Mnemonic
Default
Table 13.Configuration Register Bit Descriptions
Bit
7
6
5
4
3
2
1
0
Mnemonic
ThrFixed
ThrMD1
ThrMD0
EnCh1
EnCh2
MD2
MD1
MD0
Description
ThrFixed = 1 sets the fixed threshold mode. The outputs reflect comparison of data and a fixed (constant) value
of the threshold registers.
ThrFixed = 0 sets the adaptive threshold mode. The outputs reflect comparison of data to the adaptive
thresholds. The adaptive threshold is set dynamically, based on the history of the previous data.
These bits set the output comparators mode.
ThrMD1
0
0
1
1
Enables conversion on Channel 1.
Enables conversion on Channel 2.
Converter mode of operation setup.
MD2
0
0
0
0
1
ThrFixed
Bit 7
0
MD1
0
0
1
1
X
ThrMD0
0
1
0
1
ThrMD1
Bit 6
0
MD0
0
1
0
1
X
Mode
Idle
Continuous
Conversion
Single Conversion
Power-Down
Reserved
Threshold Mode
Negative
Positive
In-Window
Out-Window
ThrMD0
Bit 5
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0
EnCh1
Bit 4
1
Adaptive Threshold Mode
data < average – sensitivity
data > average + sensitivity
data > average – sensitivity
AND
data < average + sensitivity
data < average – sensitivity
OR
data > average + sensitivity
Description
Part is fully powered up but performing no conversion.
Part is repeatedly performing conversions on the enabled
channel(s). If two channels are enabled, the part is
sequentially switching between them.
Part performs a single conversion on the enabled channel. If
two channels are enabled, the part performs two
conversions, one on each channel. After finishing the
conversion(s), the part goes to the idle mode.
Powers down the on-chip circuits, except the digital
interface.
Do not use these modes.
EnCh2
Bit 3
1
Output Active When
Bit 2
MD2
0
Fixed Threshold Mode
Data < Threshold
Data > Threshold
‒
–
Bit 1
MD1
0
AD7150
Bit 0
MD0
1