1 A SMART SENSOR EXAMPLE

An application development is described here as an example which covers general items such

as analog data acquisition and treatment with peripheral activation and with operation

sequencing. The ST62 family of microcontroller is chosen as target device since it provides all

the features needed for this kind of application: A/D convertors, high output current capability

and a small package.

The application shown consists of an analog sensor input associated with data treatment

issuing two types of information: The relative position, lower or higher, versus a meanpoint or

reference value and the amplitude of the difference. This smart sensor can be used in a

positioning controller, temperature regulator or any other system requiring as parameters a

direction and amplitude.

A basic version reduced to a simple, straightforward data treatment is described. Its main

purpose is to present the methodology used and main features of the tool.

Application graphical description

Analysis and code generation

Simulation and validation

In a second step, the response of the system is modified to be compatible with non linear input

signals or non linear interfaces.

Finally a self calibration feature is implemented to compensate for imprecision on the input

sensor.

These last examples highlight the easy upgrading capability for an application.

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