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AN780

Title
Title
15-Kilogram Scale Using the TC520 (TC500/A, TC520)
Name
Name
AN780
Date
Date
06/24/2015
Application Categories
Application Categories
Signal Conditioning & Measurement / ADC
Product Categories
Product Categories
Mixed Signal / A D Converters Dual Slope
Description
Description
A 15kg weighing scale was designed using Microchip's TC500A Analog Processor and the TC520 16-bit Controller. The scale is required to resolve down to 1/8 gram and correct to within 61/2 gram. This project takes into account all aspects of a functional scale: Dynamic Range, Strain Gauge Compensation, Zeroing, Oversampling, Units Conversion (kilograms to pounds). The TC500A is an analog processor device which performs a dual-slope analog-to-digital conversion function. All of the counting and timing for the conversion must be controlled by an external source. In nearly all applications, this control source is a microprocessor. The microprocessor is programmed to monitor the status and to control the timing of the TC500A. It must also be programmed to count the conversion results.

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