MPR031EPR2 Freescale, MPR031EPR2 Datasheet - Page 3

• Manufacturer Part Number: MPR031EPR2
• Manufacturer: Freescale

Specifications of MPR031EPR2

• Lead Free Status / RoHS Status: Compliant

Sensors
Freescale Semiconductor
2
2.1
Table 1
appropriate chapter.
Table 1. Device Pin Assignment
The package available for the MPR03X is a 2 x 2 mm 8 pin μDFN. The package and pinout is shown in
2.2
The MPR03X Capacitive Touch Sensor Controller requires one external passive component. As shown in
should have a 75 kΩ 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
4.7 kΩ pull-up resistor should be included on the IRQ.
The remaining three connections are SCL, SDA, IRQ. 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
interface to communicate with the MPR03X. All of the connections for the MPR03X are shown by the schematic in
Pin
1
2
3
4
5
6
7
8
shows the pin assignment for the MPR03X. For a more detailed description of the functionality of each pin, refer to the
External Signal Description
Device Pin Assignment
Recommended System Connections
IRQ/ELE2
Name
REXT
ELE0
ELE1
SDA
SCL
V
V
DD
SS
I
I
Ground
Positive Supply Voltage
Reference Resistor
Connect a 75 kΩ ±1% resistor from REXT to V
Electrode 0
Electrode 1
Interrupt Output or Touch Electrode Input 2
IRQ is the active-low open-drain interrupt output
Figure 4. Recommended System Connections Schematic
2
2
C Serial Clock Input
C Serial Data I/O
I ² C Serial
Interface
SCL
SDA
V
V
V SS
SS
DD
75k
Figure 3. Package Pinouts
2
1
3
4
REXT
SCL
SDA
MPR03X
MPR03X
V DD
V SS
IRQ/ELE2
8
7
6
5
ELE0
ELE1
IRQ/ELE2
ELE1
REXT
ELE0
Function
SS
3
1
2
DD
and V
Figure
Table
SS
lines and a
1, the REXT line
3.
Figure
MPR03X
4.
2
C
3