EVAL-AD7147-1EBZ

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Introduction

EVAL-AD7147-1EBZ is a tool developed by Analog Devices to analyze, test and evaluate capacitive sensing systems. It is designed as a support to design engineers interested in developing capacitive sensing systems, such as in medical, industrial, automotive and consumer electronics applications. The main components of this evaluation tool are the AD7147-1 sensor integrated circuit (IC) evaluation board, the 7132 capacitive sensing evaluation board and the GUI software.

Application Field

EVAL-AD7147-1EBZ is mainly used to evaluate capacitive sensing systems for several application fields. It is used for industrial applications where there is a need for reliable detection and positioning of various objects (small parts, parts that don’t have visible features, etc.). It is also used in medical applications such as patient monitoring and detection of vital signs such as heart rate, respiration rate, blood pressure, oxygen saturation and glucose level. Additionally, the EVAL-AD7147-1EBZ can be used in automotive applications such as tire pressure and ABS sensors. Finally, it is also used in various consumer electronics applications such as touch-controlled content navigation in mobile devices and UIs for home automation and smart-home solutions.

Working Principle

EVAL-AD7147-1EBZ is based on a capacitive sensing technology. This technology works based on the displacement current present in capacitive structures that regulate the magnitude of the signal sensed. When there is a change in the environment, the capacitance of a capacitive structure changes proportionally with that change, and thus, the magnitude of the signal sensed. The capacitance changes depend on the distance between the two electrodes of the capacitive structure, the relative permittivity of the material, temperature, number of electrical conductors in the environment, and other environmental conditions. The EVAL-AD7147-1EBZ consists of integrated key-electrode structures, thus, the capacitance changes in the environment can be applied to the electrodes.

The AD7147 is an integrated circuit with an embedded microcontroller and an on-chip capacitive sensing core. The capacitive sensing core consists of key-electrode capacitive structures with mutual capacitance measurement elements. The core also includes an excitation controller, analog-to-digital converter and digital interface engine module to interface with the microcontroller. The microcontroller provides the calculations to turn the capacitance measurements and other sensor parameters into a digital signal for interpretation by the application process. The AD7147 is an evaluated component in the EVAL-AD7147-1EBZ, in order to measure and monitor capacitive sensing systems easily and accurately.

The evaluation board includes 22 pins, four of which are used to provide power and ground for the board. It also has 12 pins for analog signal input, four pins for digital signal input and two pins for digital signal output. The board has two capacitive electrode structures of 22 and 18 pins, respectively. Each of the pins is connected to a capacitance sensing element. The analog signals from the pins are sampled and converted into a digital signal. The digital signal is then processed by the microcontroller for interpretation by the application process.

Conclusion

EVAL-AD7147-1EBZ is a versatile tool for evaluating capacitive sensing systems in a range of application fields such as medical, industrial, automotive and consumer electronics. The evaluation board consists of an integrated circuit with an embedded microcontroller and an on-chip capacitive sensing core, including mutual capacitance measurement elements and excitation controller, analog-to-digital converter and digital interface engine modules. The board includes 22 pins for power, signal input and output, and is connected to two capacitive electrode structures with 22 and 18 pins, respectively. Thus, EVAL-AD7147-1EBZ is used to easily and accurately measure and monitor capacitive sensing systems.

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