Freescale Semiconductor Evaluation Board MPR031/2 for 2- or 3-pad touch sensor controllers DEMOMPR031 DEMOMPR031 データシート

Sensors
Freescale Semiconductor

3

 shows the pin assignment for the MPR03X. For a more detailed description of the functionality of each pin, refer to the 

appropriate chapter.

The package available for the MPR03X is a 2 x 2 mm 8 pin 

DFN. The package and pinout is shown in 

The MPR03X Capacitive Touch Sensor Controller requires one external passive component. As shown in 

should have a 75 k

connected from the pin to GND. This resistor needs to be 1% tolerance.

In addition to the one resistor, a bypass capacitor of 10 µF should always be used between the V

DD

 and V

SS

 lines and a 

4.7 k

 pull-up resistor should be included on the IRQ. Note: This condition is when pin 8 is used for interrupt indication and not 

for electrode sensing.

The remaining two connections are SCL and SDA. Depending on the specific application, each of these control lines can be used 
by connecting them to a host controller. In the most minimal system, the SCL and SDA must be connected to a master I

2

C 

interface to communicate with the MPR03X. All of the connections for the MPR03X are shown by the schematic in 

1

SCL

I

2

C Serial Clock Input

2

SDA

I

2

C Serial Data I/O

3

V

SS

Ground

4

V

DD

Positive Supply Voltage

5

REXT

Reference Resistor
Connect a 75 k

 ±1% resistor from REXT to V

SS

6

ELE0 Electrode 

0

7

ELE1

Electrode 1

8

IRQ/ELE2

Interrupt Output or Touch Electrode Input 2
IRQ is the active-low open-drain interrupt output

1

SCL

2

3

8

7

6

5

4

SDA

V

SS

V

DD

IRQ/ELE2

ELE1

ELE0

REXT

Interface

I²C Serial

3

VSS

SDA

SCL

ELE0

ELE1

IRQ/ELE2

1

2

VSS

75k

VDD

REXT