MPR031 데이터 시트보기 (PDF) - Freescale Semiconductor

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MPR031

Proximity Capacitive Touch Sensor Controller

Freescale Semiconductor 

2 External Signal Description

2.1 Device Pin Assignment

Table 1 shows the pin assignment for the MPR03X. For a more detailed description of the functionality of each pin, refer to the

appropriate chapter.

Table 1. Device Pin Assignment

Pin

Name

Function

1

SCL

I2C Serial Clock Input

2

SDA

I2C Serial Data I/O

3

VSS

Ground

4

VDD

Positive Supply Voltage

5

REXT

Reference Resistor

Connect a 75 kΩ ±1% resistor from REXT to VSS

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

The package available for the MPR03X is a 2 x 2 mm 8 pin UDFN. The package and pinout is shown in Figure 3.

SCL 1

SDA 2

VSS 3

VDD 4

8 IRQ/ELE2

MPR03X 7 ELE1

6 ELE0

5 REXT

Figure 3. Package Pinouts

2.2 Recommended System Connections

The MPR03X Capacitive Touch Sensor Controller requires one external passive component. As shown in Table 1, the REXT line

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 10µF should always be used between the VDD and VSS lines and a

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 I2C

interface to communicate with the MPR03X. All of the connections for the MPR03X are shown by the schematic in Figure 4.

VDD

I²C Serial

Interface

SCL

ELE0

1

SDA

MPR03X ELE1

2

REXT

75k

IRQ/ELE2

3

VSS

VSS

Figure 4. Recommended System Connections Schematic

Sensors

Freescale Semiconductor

Preliminary

MPR03X

3

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