AD7147(Rev0) View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD7147
(Rev.:Rev0)

CapTouch™ Programmable Controller for Single-Electrode Capacitance Sensors

Analog Devices 

AD7147

A button sensor generally requires one sequencer stage; this is

shown in Figure 25 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 25, with

B2 and B3 representing the differentially configured button sensors.

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.

CIN0

CIN1

CIN2

CIN3

CIN4

CIN5

CIN6

CIN7

CIN8

CIN9

CIN10

CIN11

CIN12

STAGE11

STAGE10

STAGE9

STAGE8

STAGE7

STAGE6

STAGE5

STAGE4

STAGE3

STAGE2

STAGE1

STAGE0

Σ-Δ

16-BIT

ADC

SCROLL

WHEEL

Figure 24. CDC Conversion Stages

AD7147

SEQUENCER

STAGE0

+

–

CDC

STAGE1

+

–

CDC

STAGE2

+

–

CDC

STAGE3

+

–

CDC

STAGE4

+

–

CDC

STAGE5

+

–

CDC

STAGE6

+

–

CDC

STAGE7

+

–

CDC

BUTTONS

B1

B2

B3

SLIDER

AD7147

SEQUENCER

STAGE8

+

–

CDC

STAGE9

+

–

CDC

AD7147

SEQUENCER

STAGE10

+

–

CDC

STAGE11

+

–

CDC

Figure 25. Sequencer Setup for Sensors

Rev. 0 | Page 15 of 68

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