AD7142 datasheet(13/68 Pages) AD

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AD7142

Rev. 0 | Page 13 of 68

CAPACITANCE SENSOR INPUT CONFIGURATION

Each stage of the AD7142 capacitance sensors can be uniquely

configured by using the registers in Table 45 and Table 46. These

registers are used to configure input pin connection setups,

sensor offsets, sensor sensitivities, and sensor limits for each

stage. Each sensor can be individually optimized. For example,

a button sensor connected to STAGE0 can require a different

sensitivity and offset values than a button with a different

function that is connected to a different stage.

CIN INPUT MULTIPLEXER SETUP

The CIN_CONNECTION_SETUP registers in Table 45 list the

different options that are provided for connecting the sensor

input pin to the CDC converter.

The AD7142 has an on-chip multiplexer to route the input

signals from each pin to the input of the converter. Each input

pin can be tied to either the negative or the positive input of the

CDC, or it can be left floating. Each input can also be internally

connected to the CSHIELD signal to help prevent cross coupling. If

an input is not used, always connect it to CSHIELD.

For each input pin, CIN0 to CIN13, the multiplexer settings can

be set on a per sequencer stage basis. For example, CIN0 is

connected to the negative CDC input for conversion STAGE1,

left floating for sequencer STAGE1, and so on for all twelve

conversion stages.

Two bits in each register control the mux setting for the input pin.

CIN0

CIN1

CIN2

CIN3

CIN4

CIN5

CIN6

CIN7

CIN8

CIN9

CIN10

CIN11

CIN SETTING

CIN_CONNECTION

_SETUP BITS

CINX FLOATING

CINX CONNECTED TO

NEGATIVE CDC INPUT

CINX CONNECTED TO

POSITIVE CDC INPUT

CINX CONNECTED TO

CSHIELD

CDC

–

CIN12

CIN13

Figure 19. Input Mux Configuration Options

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