MPR084

Sensors

2

Freescale Semiconductor

Preliminary

1

Device Overview

1.1

Introduction

Freescale Semiconductor’s MPR084 proximity capacitive touch sensor controller is one of a family of products designed to detect

the state of capacitive touch pads. The MPR084 offers designers a cost-efficient alternative to mechanical keys for control panel

applications.

host of status changes. The MPR084 includes a piezo sounder drive which provides audible feedback to simulate mechanical

key clicks. The MPR08X family has several implementations to use in your design including control panels and switch

replacements. The MPR084 controls individual touch pads. Other members of the MPR08X family are well suited for other

application interface situations such as individual touch pads or rotary/touch pad combinations.

Freescale offers a broad portfolio of proximity sensors for products ranging from appliance control panels to portable electronics.

Target markets include consumer, appliance, industrial, medical and computer peripherals.

1.1.1

Devices in the MPR08X series

The MPR08X series of Proximity Capacitive Touch Sensor Controllers allows for a wide range of applications and

implementations. Each of the products in Table 1 perform a different application specific task and are optimized for this specific

functionality.

1.1.2

Internal Block Diagram

and Status registers, Touch Pad Decoder, Magnitude Comparator and Recalibrator, EMI Burst/Noise Rejection Filter,

Capacitance Measurement Analog Front End. Each of these blocks will be described in detail in their respective sections.

Figure 2. Functional Block Diagram

Table 1. MPR08X Family Overview

Product

Bus

Sounder

Rotary/Slider

Touch Pad Array

MPR083

Yes

8-pads

—

MPR084

Yes

—

8 keys

8

8

8

PAD

ENABLED

IRQ

SDA

SCL

I2C

SERIAL

INTERFACE

INTERRUPT

CONTROLLER

MASKS

SET

RATE

ATTN

AD0

SOUNDER

SOUNDER

DRIVER

CONTROLLER

CLEAR

TOUCHED

PAD

IDENTIFY

DECODER

PAD

CURRENT

8

8 TOUCH PADS