AD7147PACPZ-RL Analog Devices Inc, AD7147PACPZ-RL Datasheet - Page 15

• Manufacturer Part Number: AD7147PACPZ-RL
• Description: CAPACITANCE TO DIGITAL CONVERTER
• Manufacturer: Analog Devices Inc
• Series: CapTouch™r
• Type: Capacitive Sensor Controllerr

Specifications of AD7147PACPZ-RL

• Resolution (bits): 16 b
• Data Interface: I²C
• Voltage Supply Source: Single Supply
• Voltage - Supply: 2.6 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sampling Rate (per Second): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A button sensor generally requires one sequencer stage; this is
shown in Figure 26 as B1. However, it is possible to configure
two button sensors to operate differentially for one conversion
stage. Only one button can be activated at a time; pressing both
buttons simultaneously results in neither button being activated.
The configuration with two button sensors operating differentially
requires one conversion stage and is shown in Figure 26, with
B2 and B3 representing the differentially configured button sensors.
SCROLL
WHEEL
CIN10
CIN11
CIN12
CIN0
CIN1
CIN2
CIN3
CIN4
CIN5
CIN6
CIN7
CIN8
CIN9
Figure 26. Sequencer Setup for Sensors
Figure 25. CDC Conversion Stages
STAGE0
STAGE1
STAGE2
Rev. B | Page 15 of 72
SEQUENCER
STAGE3
STAGE4
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STAGE0
STAGE1
STAGE2
STAGE3
STAGE4
STAGE5
STAGE6
STAGE7
STAGE5
STAGE6
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
– CDC
16-BIT
STAGE7
ADC
CDC
CDC
CDC
CDC
CDC
CDC
CDC
Σ-Δ
STAGE8
STAGE9
STAGE10
STAGE11
A wheel sensor requires eight stages, whereas a slider requires two
stages. The result from each stage is used by the host software to
determine the user’s position on the slider or wheel. The algorithms
that perform this process are available from Analog Devices and are
free of charge, but require signing a software license.
SLIDER
BUTTONS
B1
B2
B3
SEQUENCER
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SEQUENCER
STAGE8
STAGE9
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STAGE10
STAGE11
+
–
+
–
CDC
CDC
+
–
+
–
CDC
CDC
AD7147