ADS7843EG4

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Data Acquisition - Touch Screen Controllers - ADS7843EG4 application field and working principle

The ADS7843EG4 is a low-power, 12-bit, 4-wire, touch screen controller designed specifically for microcontroller-based application systems. The device features a built-in SINC4™ filter for handling multiple-touches and a 12-bit ADC for superior performance. This touch screen controller offers users an easy way to detect and track multiple-touches on a touch-sensitive display panel. It also supports latching, coordinate and pressure mapping, touch-zone detection, and antialiasing filtering.

The ADS7843EG4’s two-layer architecture consists of an analog front-end, which includes signal conditioning and sample-and-hold circuitry, and a digital-signal-processing engine, which includes the SINC4™ filter and a 12-bit ADC. The signal conditioning is a two-stage filter that boosts low-frequency signals while allowing higher-frequency signals to be quickly canceled out. It also provides noise rejection and signal demodulation. The sample-and-hold aids in keeping the signal-to-noise ratio of the analog front-end high.

The digital-signal-processing engine also includes a SINC4™ filter, which is used to track multi-touches on the panel. The SINC4™ filter is a technique for reducing the number of samples required to detect the presence of a touch. The technique is to assume that the multi-touches can be detected by collecting a set of data points, and then track the motions of the multi-touches by estimating the forces and directions of the edges of the panel being touched.

The 12-bit ADC of the ADS7843EG4 is used to measure the electrical input signals. It is also used to process the data points gathered by the SINC4™ filter. The 12-bit resolution gives the device a much higher accuracy than an 8-bit ADC, resulting in better accuracy and repeatability in detecting and tracking multiple touches. The 12-bit resolution also minimizes artifacts caused by power supply noise and reduces processor overhead by allowing faster sample rates.

The ADS7843EG4 provides two channels to detect the X-axis and Y-axis of the touch motion. The two channels are buffered and internally switched between the two channels. The device also supports power saving mode, allowing users to reduce power consumption when the device is idle. The ADS7843EG4 also includes built-in ESD protection, which helps protect the device against static discharge and voltage transients.

The ADS7843EG4 is ideal for low-power consumer-interface solutions such as gaming, home automation and point-of-sale terminals. It is also suitable for medical and industrial applications that require long-term reliability and greater accuracy. It is designed to operate at a supply voltage of 3.3V and can be used with consumer or industrial touchscreens with resolutions of up to 12-bits. The device can also be interfaced to microcontrollers easily, as it comes with detailed documentation.

The ADS7843EG4 provides users with a complete touch screen system solution. Its built-in SINC4™ filter, 12-bit ADC and ESD protection make it suitable for a wide range of applications. Its low power consumption and precise data acquisition provide the added benefits required in these types of applications. Furthermore, the device offers several features that enable users to easily and quickly integrate it into their system, such as configurable sample rates and automatic multiple-touch detection.

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