BUF16821EVM-USB

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Evaluation and Demonstration boards and kits have a variety of uses amongst auditors, testers and technicians. They typically fulfill a wide range of roles that all contribute to a sound and reliable testing and development process. One such board is the BUF16821EVM-USB from Texas Instruments, which has a unique application field and working principle that make it ideal for a variety of testing jobs.

The BUF16821EVM-USB, also known as the Evaluation Module (EVM), is a low power integrated biometric sensor evaluation board based on the BUF16821 miniature biometric sensor. The board is designed to facilitate evaluation and demonstration of the device\'s core functionality. It is essentially an all-in-one development platform that combines a microcontroller, a wide range of onboard sensors, an integrated battery charger with switch mode power supply (SMPS), an AC/DC power supply, and a USB interface.

The BUF16821EVM-USB allows for evaluation and demonstration of capacitive thin film silicon sensors. Such sensors can detect a variety of biometric parameters such as fingerprints, facial features, hand geometry, vein patterns, and even voice recognition. It also incorporates a 9DoF IMU that includes 3-axis accelerometer, 3-axis gyroscope, and 3-axis magnetometer. Additionally, the device is equipped with an ARM-based STM32 MCU with USB interface and 2 MB of program and data memory, allowing the user to read and write data to a host PC.

The BUF16821EVM-USB\'s use is very diverse, reaching across various disciplines including healthcare, security, industrial automation, and automotive applications. Additionally, the onboard sensor and actuator blocks make it a perfect tool for training and practical demonstration purposes. For such purposes, the board is provided with a comprehensive software development environment compliant with Texas Instruments\' Code Composer Studio, Data Visualizer (DV) or XDS emulation software. This software also provides samples and graphical wizards to help the user in the development of the necessary functions to interact with the BUF16821EVM-USB.

The board\'s working principle is based on the capacitive sensor technology, which measures a certain value by sensing changes in the capacitance of the sensor. The BUF16821EVM-USB utilizes sixteen channels, each of which can measure the capacitance of a finger placed at a certain distance away from the channel\'s surface. This distance is also known as the sensing area and can vary from 6.0 mm to 6.5 mm.

The sensing data obtained by the BUF16821EVM-USB must be processed in order to get accurate biometric data. For this purpose, the BUF16821EVM-USB includes program code that enables the device to analyze the capacitance of each sensing area every 2 ms and, based on this data, accurately calculate the location of a quantized finger pattern.

Ultimately, the BUF16821EVM-USB is an invaluable tool for audio-visual demonstrations, training purposes, and evaluation in a number of different fields. The wide range of onboard software and hardware functions make it a powerful, versatile and inexpensive device that can make a difference in testing and development processes around the world.

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