mpr031 Freescale Semiconductor, Inc, mpr031 Datasheet - Page 2

• Manufacturer Part Number: mpr031
• Description: Proximity Capacitive Touch Sensor Controller
• Manufacturer: Freescale Semiconductor, Inc

MPR03X
2
1
1.1
MPR03X is a small outline, low profile, low voltage touch sensor controller in a 2 mm x 2 mm DFN which manages up to three
touch pad electrodes. An I
interrupt output advises the host of electrode status changes. The interrupt output is a multiplexed with the third electrode output,
so using the interrupt output reduces the number of electrode inputs to two. The MPR03X includes three levels of input signal
filtering to detect pad input condition changes due to touch without any processing by the application.
1.2
0V
SDA
SCL
IRQ
REXT
ELE0
ELE1
ELE2
Device Overview
Introduction
Internal Block Diagram
SDA
SCL
IRQ SET
Debounced
Comparator
Controller
Magnitude
Interrupt
Results
Interface
Traffic
CLR
0 1 2
I²C
2
C interface communicates with the host controller at data rates up to 400 kbits/sec. An optional
Current SourceMultiplexor
Debounce
Registers
Average
Filtered
Result
User
Figure 2. Functional Block Diagram
Sample
Count
Number of
Electrodes
Debounce
Interval
Debounce
Count
Sample
Interval
Debounce Filter Registers
Select Chan
4 x Sum Registers
4 x Max Registers
4 x Min Registers
Un-Touched
Baseline
Filter
Iref
Sel
Debounce
Counters
Sample
Preliminary
and
4
Mirror
2
Iset
0
1
2
Select
Chan
3
Oscillator
Average
Filtered
32 kHz
Sample
Result
Shutdown
ADC Controller
32 kHz8 MHz
10 Bit ADC
Sample Filter Registers
Sum Register
Max Register
Min Register
Oscillator
8 MHz
Convert
Shutdown
Enable
Clock
Data
Freescale Semiconductor
10
Shutdown
Start Conversion
Set Input Channel
Set Grounded
Electrodes
Set Source Current
ADC Result
Set Source Current
Shutdown
Start Conversion
8MHz
ADC Result
8MHz
Set Input Channel
Set Grounded
Electrodes
Sensors