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This application note outlines the development and implementation of a Digital Weigh-Scale (DWS) utilizing Zilog's Z8 Encore! Microcontroller. The reference design provides a ready-to-use DWS solution that is easily scalable for measuring high-capacity loads. An external high-resolution Analog-to-Digital Converter (ADC) is employed to accurately measure the output from the load cell. The weight measurement is displayed on an LCD. This reference design is based on the Z8 Encore! MCU, which communicates with the 24-bit ADC CS5550 via the Serial Peripheral Interface (SPI). The load cell's output voltage is filtered through a Low-Pass Filter (LPF) to eliminate high-frequency noise before being sent to the ADC. The measured weight is presented on an 8 x 1 LCD.

The Digital Weigh-Scale (DWS) system described utilizes a Zilog Z8 Encore! Microcontroller, which serves as the central processing unit for the application. This microcontroller is adept at handling multiple tasks, including interfacing with the load cell, processing the data from the ADC, and controlling the display output.

The load cell, which is the primary sensor in this application, converts mechanical force into an electrical signal. The output from the load cell is typically a small voltage signal that can be susceptible to noise. To enhance the accuracy of the weight measurement, a Low-Pass Filter (LPF) is integrated into the circuit. This filter is designed to allow low-frequency signals (representing the actual weight) to pass while attenuating high-frequency noise that may distort the measurement.

The filtered signal is then fed into a high-resolution 24-bit Analog-to-Digital Converter (ADC), specifically the CS5550, which is known for its precision in converting analog signals to digital format. The ADC operates via the Serial Peripheral Interface (SPI), a robust communication protocol that facilitates fast data transfer between the microcontroller and the ADC. The Z8 Encore! MCU processes the digital output from the ADC, allowing for accurate weight calculations.

Finally, the processed weight data is displayed on an 8 x 1 LCD, providing a user-friendly interface for reading the measured weight. The design is scalable, enabling the system to be adapted for various applications requiring the measurement of high-capacity loads, making it a versatile solution in digital weighing technology.This application note describes the development and use of a Digital Weigh-Scale (DWS) using Zilog`s Z8 Encore! ® Microcontroller This reference design offers a ready-to-use DWS solution easily scalable to measure high-capacity loads.

A high-resolution Analog-to-digital Con- verter (ADC) external to the Microcontroller is used to accurately measu re the load cell output. The measured weight is displayed on the LCD This reference design is based on the Z8 Encore! MCU which communicates with the 24-bit ADC CS5550 through Serial Peripheral Interface (SPI). The output voltage of the load cell is passed through a Low-Pass Filter (LPF) to suppress any high frequency noise and applied to ADC The measured weight is displayed on a 8 x 1 LCD 🔗 External reference