FREESCALE SEMICONDUCTOR - DEMOMPR083 - KIT, DEMO, MPR083

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Product Overview

Proximity Capacitive Touch

Sensor Controller

MPR083 OVERVIEW

The MPR083 is an Inter-Integrated Circuit Communication (I2C) driven Capacitive Touch Sensor Controller, optimized to manage

an 8-position rotary shaped capacitive array. The device can accommodate a wide range of implementations through 3 output mechanisms, and many configurable options.

Product Introduction

Freescale Semiconductor’s MPR083 proximity capacitive touch sensor controller is one of a family of products designed to detect the state of capacitive touch pads. The MPR083 offers designers a cost-efficient alternative to mechanical rotary switches for control panel applications.

The MPR083 uses an I2C interface to communicate with the host which configures the operation and an interrupt to advise the host of status changes. The MPR083 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 MPR083 controls rotary and linear sliders. 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.

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 perform a different application specific task and are optimized for this specific functionality.

Product Features

• 1.8 V to 3.6 V operation
• 41 μA average supply current with 1 s response time
• 2 μA Standby Current
• Variable low power mode response time (32 ms – 4 s)
• Rejects unwanted multi-key detections from EMI events such as PA bursts or user handling
• Ongoing pad analysis and detection is not reset by EMI events
• Data is buffered in a FIFO for shortest access time
• IRQ output advises when FIFO has data
• System can set interrupt behavior as immediate after event, or program a minimum time between successive interrupts
• Current rotary position is always available on demand for pollingbased systems
• Sounder output can be enabled to generate key-click sound when rotary is touched
• Two hardware selectable I2C addresses allowing two devices on a single I2C bus
• Configurable real-time auto calibration
• 5 mm x 5 mm x 1 mm 16 lead QFN package
• -40°C to +85°C operating temperature range

Implementations

• Control Panels
• Switch Replacements
• Rotary and Linear Sliders

Typical Applications

• Appliances
• PC Peripherals
• Access Controls
• MP3 Players
• Remote Controls
• Mobile Phones

Internal Block Diagram

The MPR083 consists of primary functional blocks; Interrupt Controller, I2C Serial Interface, Sounder Controller, Configuration and Status registers, Rotary Position 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.