AD7877ACPZ-REEL

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The AD7877ACPZ-REEL is a low-power, single-chip data acquisition system for touch screen controllers and industrial systems. The integrated device contains the key components needed for touch screen controller designs, including an integrated touchscreen, a capacitive sensing unit, a dual-slope A/D converter, and an oscillator. It also features a 10-bit resolution specification, small size, and low power consumption.

The AD7877ACPZ-REEL can be used in many industrial applications, such as mobile phones, tablets, and portable medical devices. It is also suitable for handheld consumer electronics and white goods. The device is a touch screen controller that integrates capacitive-sensing technology, ad converters, oscillators, and other components into a low-power application. The controller is specialized for industrial and consumer use and supports temperature sensing, current sensing, vibration sensing, and noise-sensing applications.

An AD7877ACPZ-REEL controller includes an analog driving unit, an oscillator, a signal-comparator unit, and a phase-locked loop. The analog driving unit is responsible for generating the required drive signals and sending them to the sensing electrodes of the touch screen panel. The oscillator generates the clock signal for the signal-comparator unit, Power and ground are supplied to the oscillator by the system. The signal-comparator unit analyzes the signal from the sensing electrodes and compares it with the reference signal generated by the analog driver. Based on the comparison, a decision is made on the status of the displayed position, i.e., whether it is a touch indicated or not. The phase-locked loop is used to synchronize the A/D conversion cycle.

The capacitors of the capacitive sensing unit are responsible for sensing and interpreting the electric field that is created when a finger touches the touch panel. The signals collected by the capacitors are fed to the signal-comparator unit and compared with the reference signal. If the signal is higher than the reference signal, it is interpreted as a touch indicated. The signal is then converted to a digital value by the A/D converter and sent to the processor. The processor then interprets the data and passes it to the operating system.

The AD7877ACPZ-REEL is an efficient, cost-effective solution for capacitive touch screen designs. It offers a higher resolution, 10-bit A/D converter that delivers excellent accuracy and integrity. The device features low power consumption, and its small size makes it an ideal choice for many industrial and consumer applications.

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