MPR031(2009) View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
Manufacturer
MPR031 Datasheet PDF : 32 Pages
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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).
Run1 Mode with 3 Electrodes
Run1 Mode with 2 Electrodes
ELE0
1
2 ELE1
3 ELE2
Capacitance
Measurement
Engine
Filters
and
Touch
Detection
ELE0
1
ELE1
2
INT
Capacitance
Measurement
Engine
Interrupt
Filters
and
Touch
Detection
ELE0
1
INT
Run1 Mode with 1 Electrode
Capacitance
Measurement
Engine
Interrupt
Filters
and
Touch
Detection
4.4 Run2 Mode
Figure 14. Electrode/Pad Connections in Run 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).
1 ELE0
2 ELE1
ELE2
3
Run2 Mode to 3 Pads
Capacitance
Measurement
Engine
Filters
and
Touch
Detection
ELE0
1
ELE1
2
INT
Run2 Mode to 2 Pads
Capacitance
Measurement
Engine
Interrupt
Filters
and
Touch
Detection
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.
7
6
54
3
2
1
0
R0
CalLock ModeSel
W
EleEn
Reset: 0
0
00
0
0
0
0
= Unimplemented
Figure 16. Electrode Configuration Register
MPR03X
10
Sensors
Freescale Semiconductor
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