MAX9921EVKIT+

MAX9921EVKIT+ is an evaluation and demonstration board and kit developed by Maxim Integrated. It is primarily used for investigating, demonstrating, and evaluating the performance of the MAX9921/9922/9923 analog front-end integrated circuits. It provides a 16-channel capacitive-touch-based detection system. The kit is designed to provide a simple evaluation platform for the MAX9921/22/23 devices and the experience of working with the same. It consists of a baseboard (main board) and daughter board that are used together.

The MAX9921/22/23 devices are high-precision, low-power, low-noise analog front-end integrated circuits. They are specifically designed for capacitive touch sensing applications. These devices integrate an operational amplifier, multiplexer, and integrated analog-to-digital converter with high linearity and low power consumption. They also include a custom set of features such as a low-supply voltage, a wide range of capability, and a built-in temperature compensation to ensure optimum accuracy and response time under all conditions.

The MAX9921EVKIT+ provides a single-channel test system, in which the maximum input capacitance of a MAX9921/22/23 device can be measured. It has an input channel that allows an external capacitive touch-sensing element to be connected to the kit. The input channel allows capacitors with a capacitance ranging from 0.6pF to 100pF to be connected to it. The MAX9921/22/23 device integrated on the daughter board senses the capacitance of the input, and the results can be monitored on the LCD display of the kit. The MAX9921/22/23 devices feature a wide operating voltage range (1.8V to 5.5V) and low-power operation, making them ideal for capacitive touch applications.

The MAX9921EVKIT+ also features a wide range of additional features. These features include an integrated library of firmware and software, adjustable compensation frequency, adjustable detection threshold, a temperature sensor, and a Power-On Self-Test (POST) feature. The integrated library allows the designer to access register settings, initialization routines, and algorithms to configure the MAX9921/22/23 devices. The adjustable compensation frequency and detection threshold help to enhance the performance of the capacitive touch sensor. The temperature sensor eliminates the need for an external temperature compensation device. The POST feature automatically checks for the presence of the MAX9921/22/23 devices and verifies their functionality.

The MAX9921EVKIT+ is a comprehensive evaluation and demonstration board and kit that is suitable for evaluating and demonstrating the performance of the MAX9921/22/23 devices in capacitive touch sensing applications. It comes with a wide range of integrated features that allow the designer to configure, evaluate, and optimize the performance of the MAX9921/22/23 devices for their specific application. It also provides a simple and intuitive interface for measuring the capacitance of external capacitive touch-sensing elements.