ADS7843E

Series:	--
Packaging:	Tube
Part Status:	Active
Touchscreen:	4 Wire Resistive
Resolution (Bits):	12 b
Interface:	Serial
Voltage Reference:	External
Voltage - Supply:	2.7 V ~ 5 V
Current - Supply:	2.5µA
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Supplier Device Package:	16-SSOP
Base Part Number:	ADS7843

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Data Acquisition - Touch Screen Controllers

The ADS7843E is a touch screen controller that provides contact data acquisition in applications such as interactive whiteboards, kiosks, point of sales systems, gaming, and other applications. It features a high-sensitivity capacitive touch-sensing surface, which eliminates mechanical stress and wear associated with traditional pressure sensing applications. The ADS7843E also features low power consumption and a high integration design that interacts with external components, easing the difficult process of design and speeding up time to market.

Applications

The ADS7843E touch screen controller is designed for a variety of interactive applications that require a high degree of accuracy and a rapid response time. It is suitable for applications ranging from medical equipment to consumer electronics. In addition to the highly accurate capacitive touch-detection technology, the ADS7843E also offers integrated voltage controls and an automated detection algorithm which enables it to reliably detect a touch even over large areas.The integrated ADC and controller are compatible with both analog and digital interfaces, and the USB interfacing capabilities make it an ideal choice for use in many applications requiring touch input. The resolution of the sensor is adjustable, so it can be tailored for the exact application.

Working Principle

The ADS7843E touch screen controller works by measuring the capacitance changes at each location of the screen. When a finger touches the screen, it changes the local capacitance. A special algorithm is used to detect the change in capacitance and convert it into a corresponding position.When a finger touches the screen, the substrate and electrode capacitance of the selected location will change, and the capacitance of the adjacent locations should remain unchanged. So the driving signals applied to each row and column electrodes are used to calculate the touch position.The first step is to apply an AC signal to the electrodes, so that the capacitance between the touch point and the substrate can be read. The AC signal is applied to each row and column in turn, and the voltage of the touched point is read in the process. The second step is to drive a digital logic signal and measure the touch location.The logic signal is driven to each row and column at the same time, and then the voltage at the touched point is measured. Finally, the position is calculated by comparing the voltages and the positions of the rows and columns.

Conclusion

The ADS7843E is a highly accurate touch screen controller designed for a wide range of interactive applications. It has the ability to detect a touch over large areas and is compatible with both analog and digital interfaces. This makes it an ideal solution for interactive applications requiring a fast response time and a high degree of accuracy. Its low power consumption and high integration design makes it a great choice for products requiring quick time to market.

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