15-Kilogram Scale Using the TC520 (TC500/A, TC520)
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.
AN4, 15-Kilogram Scale, TC500A, TC520, Application Note