MPR031 Ver la hoja de datos (PDF) - Freescale Semiconductor

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MPR031

Proximity Capacitive Touch Sensor Controller

Freescale Semiconductor 

1 Device Overview

1.1 Introduction

MPR03X is a small outline, low profile, low voltage touch sensor controller in a 2 mm x 2 mm DFN which manages up to three

touch pad electrodes. An I2C interface communicates with the host controller at data rates up to 400 kbits/sec. An optional

interrupt output advises the host of electrode status changes. The interrupt output is a multiplexed with the third electrode output,

so using the interrupt output reduces the number of electrode inputs to two. The MPR03X includes three levels of input signal

filtering to detect pad input condition changes due to touch without any processing by the application.

1.2 Internal Block Diagram

SDA SDA

I²C

SCL

SCL Interface

Traffic

CLR

Interrupt

Controller

IRQ IRQ SET

Debounced

Results

Magnitude

Comparator

User

Registers

Average

Filtered

Debounce

Result

Debounce

Interval

Debounce

Count

Debounce

and

Sample

Interval

Sample

Counters

Sample

Count

Number of

Electrodes

Un-Touched

Baseline

Filter

Debounce Filter Registers

4 x Max Registers

4 x Sum Registers

4 x Min Registers

32 kHz

Oscillator

Shutdown

8 MHz

Oscillator

Shutdown

8MHz

32 kHz8 MHz

ADC Controller

Shutdown

Start Conversion

Set Input Channel

Set Grounded

Electrodes

Set Source Current

Average

Filtered

Sample

Result

Sample Filter Registers

Max Register

Sum Register

Min Register

ADC Result

REXT

0V

ELE0

ELE1

ELE2

Iset

Mirror

3

Current SourceMultiplexor Select Chan

012

2

0

Select

Chan

1

2

Set Source Current

Set Input Channel

Enable

Convert

10 Bit ADC Clock

Data 10

Shutdown

Start Conversion

8MHz

ADC Result

Iref

Sel

4

Figure 2. Functional Block Diagram

Set Grounded

Electrodes

MPR03X

2

Preliminary

Sensors

Freescale Semiconductor

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