MPR03X

Sensors

10

Freescale Semiconductor

4.3

Run1 Mode

In Run1 Mode, the MPR03X monitors 1, 2, or 3 electrodes which are connected to a user defined array of touch pads. When only

1 or 2 electrodes are selected, the IRQ/ELE2 pin is automatically configured as an open drain interrupt output.

When 3 electrodes are selected in Run1 Mode, the IRQ/ELE2 pin becomes the third electrode input, ELE2 (Figure 14).

Figure 14. Electrode/Pad Connections in Run Mode

4.4

Run2 Mode

In Run2 Mode, all enabled electrodes act as a single electrode by internally connecting the electrode pins together. The entire

surface of all the touch pads is used as a single pad, increasing the total area of the conductor.

When 2 electrodes are selected in Run2 Mode, the IRQ/ELE2 pin is automatically configured as an open drain interrupt output.

When 3 electrodes are selected, the IRQ/ELE2 pin becomes the third electrode input, ELE2 (Figure 15).

Figure 15. Electrode/Pad Connections in Area Detection Mode

4.5

Electrode Configuration Register

The Electrode Configuration Register manages the configuration of the Electrode outputs in addition to the mode of the part. The

address of the Electrode Configuration Register is 0x44.

Figure 16. Electrode Configuration Register

7

6

5

4

3210

R0

CalLock

ModeSel

EleEn

W

Reset:

0

0

0

0

0000

= Unimplemented

ELE0

ELE1

Capacitance

Measurement

Engine

Filters

and

Touch

Detection

ELE2

3

1

2

Run1 Mode with 3 Electrodes

INT

Interrupt

Run1 Mode with 2 Electrodes

ELE1

ELE0

Capacitance

Measurement

Engine

Filters

and

Touch

Detection

1

2

INT

Interrupt

Run1 Mode with 1 Electrode

ELE0

Capacitance

Measurement

Engine

Filters

and

Touch

Detection

1

ELE0

ELE1

INT

Capacitance

Measurement

Engine

Filters

and

Touch

Detection

ELE2

Interrupt

Run2 Mode to 2 Pads

3

1

2

ELE1

ELE0

Capacitance

Measurement

Engine

Filters

and

Touch

Detection

Run2 Mode to 3 Pads

1

2