ADS7843IDBQRQ1 Integrated Circuits (ICs)

Series:	Automotive, AEC-Q100
Packaging:	Tape & Reel (TR)
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:	280µA
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 ADS7843IDBQRQ1 is a touch screen controller used for data acquisition applications. It consists of a controller, memory, and capacitive touch screen interfaces. This device is designed to be interfaced with any type of capacitive touch screen, including resistive and surface acoustic wave (SAW) touch screens. It also supports communication interface with microcontrollers, PC/104 and PC/104 plus boards.

Features

The main features of the ADS7843IDBQRQ1 include:- Supports up to 4 analog I/Os - Real-time touch detection- 8-bit resolution - Integrated low power buffer- Resolution setting option- Low power mode- Supports A/D converter and D/A converter- Built-in real-time clock- Self-calibration

Application Fields

The ADS7843IDBQRQ1 is suitable for a wide range of applications including:- Computer keyboards- Joysticks/Gamepads- Pointing devices- Touch screens- Handheld electronic devices- Automotive systems- Mobile phones

Working Principle

The working principle of the ADS7843IDBQRQ1 is simple. It measures the capacitance value between the input and its corresponding electrode at each point on the screen. A higher capacitance value means the finger is further away from the input point and a low capacitance value means the finger is closer to the input point. The device then uses the capacitance measurements to compute the X-Y coordinates with its integrated analog-to-digital converter. These coordinates are then used to determine the position of the touch on the screen.The ADS7843IDBQRQ1 also features a low power buffer to minimize power consumption when the device is inactive and a low power mode to further reduce power consumption when the device is in idle state.

Conclusion

The ADS7843IDBQRQ1 is a versatile touch screen controller which is well-suited for various data acquisition applications. It is easy to interface with microcontrollers and supports a wide range of capacitive touch screens. With its low power consumption and self-calibration features, the device ensures good performance and reliability.

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