MPR084

Sensors

Freescale Semiconductor

19

Preliminary

6

Output Mechanisms

6.1

Introduction

The MPR084 has three primary methods for reporting data in addition to an IRQ output that is described in Chapter 7. The three

output systems are described in this section.

6.2

Instantaneous

The Instantaneous output shows the current status of the user interface. This information is displayed in terms of the current

touched pad position that is touched. Only one touch can be shown at a time.

6.2.1

Touch Pad Status Register

of the Touch Pad Status Register is 0x02.

Figure 22. Touch Pad Status Register

7

6

543210

R

E8S

E7S

E6S

E5S

E4S

E3S

E2S

E1S

W

Reset:

0

0

000000

= Unimplemented

Table 13. Touch Pad Status Register Field Descriptions

Field

Description

7

E8S

Electrode 8 Status – The Electrode 8 Status bit shows whether or not electrode 8 is touched.

0 Electrode 8 untouched

1 Electrode 8 touched

6

E7S

Electrode 7 Status – The Electrode 7 Status bit shows whether or not electrode 7 is touched.

0 Electrode 7 untouched

1 Electrode 7 touched

5

E6S

Electrode 6 Status – The Electrode 6 Status bit shows whether or not electrode 6 is touched.

0 Electrode 6 untouched

1 Electrode 6 touched

4

E5S

Electrode 5 Status – The Electrode 5 Status bit shows whether or not electrode 5 is touched.

0 Electrode 5 untouched

1 Electrode 5 touched

3

E4S

Electrode 4 Status – The Electrode 4 Status bit shows whether or not electrode 4 is touched.

0 Electrode 4 untouched

1 Electrode 4 touched

2

E3S

Electrode 3 Status – The Electrode 3 Status bit shows whether or not electrode 3 is touched.

0 Electrode 3 untouched

1 Electrode 3 touched

1

E2S

Electrode 2 Status – The Electrode 2 Status bit shows whether or not electrode 2 is touched.

0 Electrode 2 untouched

1 Electrode 2 touched

0

E1S

Electrode 1 Status – The Electrode 1 Status bit shows whether or not electrode 1 is touched.

0 Electrode 1 untouched

1 Electrode 1 touched