MPR083

Sensors

4

Freescale Semiconductor

2

External Signal Description

2.1

Device Pin Assignment

Table 3 shows the pin assignment for the MPR083. For a more detailed description of the functionality of each pin, refer to the

appropriate chapter.

The two packages available for the MPR083 are a 5x5mm 16 pin QFN and a 4x5mm 16 pin TSSOP. Both of the packages and

their respective pinouts are shown in Figure 3.

Figure 3. Package Pinouts

2.2

Recommended System Connections

The MPR083 Capacitive Touch Sensor Controller requires ten external passive components. When connecting the MPR083 in

a touch sensor system, the electrode lines must have pull-up resistors. The recommended value for these pull-ups is 780k

.

Some electrode arrays will require higher or lower values depending on the application.

In addition to the 8 resistors, a bypass capacitor of 1µF should always be used between the VDD and VSS lines and a 4.7

k

pull-up resistor should be included on the IRQ.

Table 3. Device Pin Assignment

Pin

Name

Function

1ATTN

Attention Pin. Input, active low when asserted sets the Configuration Register’s DCE bit high

allowing communication with the part.

2IRQ

Interrupt Request Pin. Output, active-low, open-drain interrupt request signaling new events.

3

VDD

Positive Supply Voltage

4

VSS

Ground

5SCL

I2C Serial Clock

6SDA

I2C Serial Data

7

AD0

Address input. Low = slave address 0x4C. High = slave address 0x4D.

8

SOUNDER

Sounder driver output. Connect a piezo sounder from this output to ground. Output is push-pull

9 - 16

E1, E2, E3, E4, E5,

E6, E7, E8

Rotary Electrode connections.

PAD

Exposed pad

Exposed pad on package underside (QFN only). Connect to VSS.

E5

E6

E7

E8

VDD

VSS

ATTN

IRQ

3

4

1

2

10

9

12

11

78

56

14 13

16 15

E1

E2

E3

E4

E5

E6

E7

E8

VDD

VSS

SCL

SDA

AD0

SOUNDER

ATTN

IRQ

1

4

3

2

5

8

7

6

16

13

14

15

12

9

10

11

QFN

TSSOP