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Touch Sensing Technologies In Automotive
With the increasing number of buttons and switches in
the vehicle, touch sensing has become an alternative
to the traditional push button switch user interface.
Touch sensing eliminates mechanical movement and
enables a completely sealed design which supports
the consumer’s demand for contemporary styling. From
proximity sensing to button replacement to button
enhancement, touch sensing enables flexibility.
mTouch? Sensing Solutions
Microchip’s mTouch Sensing Solutions provide an
easy method for designers to add touch sensing
utilizing PIC microcontrollers without the cost of fee-
based licensing and royalty agreements. With both
capacitive and inductive touch sensing solution being
available from Microchip Technology, the automotive
embedded system designer has the ?exibility to select
the right touch technology to satisfy their application
performance and cost requirements.
Capacitive Touch Sensing
Microchip’s Capacitive mTouch Sensing Solution can
Keys
Slider
Power Consumption
Plastic Front Panel
Glass Front Panel
Metal Front Panel
Waterproof
Outdoor
Gloves
Continuous Touch
Soft/Hard Touch
Capacitive
Touch
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Inductive
Touch
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be implemented with a number of PIC microcontrollers
to satisfy the demands of a broad range of application
requirements from the most basic single-button design
using an incredibly small, cost effective 6-pin PIC10F to
a multi button design using the appropriate peripheral
rich 8-bit or 16-bit PIC microcontroller.
Inductive Touch Sensing
Microchip’s Inductive mTouch Sensing Solution can be
implemented with existing application code in a single
8-, 16- or 32-bit PIC microcontroller or 16-bit dsPIC
digital signal controller, thus reducing total system
systems. The only peripherals required are a PWM and
an analog to digital converter.
How to Choose the Right Capacitive Touch
Solution for Your Application
? Good
?? Better
??? Best
The application ultimately dictates which solution best
mTouch sensing solutions can be used to aid the
automotive system designer in addressing a broad
range of requirements such as those for a sensor to
detect water in diesel fuel, a sensor for carbamide, a
level sensor for wiper ?uid, a level sensor for engine
coolant, a level sensor for fuel and many others.
suits your design. For example:
Application
Requirement
One key or proximity sensor
Up to four keys
More than eight keys with
communication; Low power < 10 μA
More than 8 keys with MCU
performance, memory features
Device
Family
PIC10F Family
PIC16F Family
PIC16F Family
PIC24F Family
www.microchip.com/touch
9
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