CAP1296-1-SL-TR

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The CAP1296-1-SL-TR is a capacitive touch controller from TI for a wide range of applications in consumer, industrial, medical, and automotive markets. Developed with the latest advancements in touch sensing technologies, the CAP1296-1-SL-TR can offer reliable and repeatable detection of a touch event on almost any surface, even through a finger glove, with a broad range of sensitivity and adaptation to any environment. This article aims to explain the application field and working principle of the CAP1296-1-SL-TR.

Application Field

The CAP1296-1-SL-TR is a versatile touch sensor controller with the capability to detect touch events over a wide variety of touch surfaces. It is perfect for applications such as gaming consoles, point-of-sale terminals, medical devices, automotive keypads, automotive touch panels and infotainment systems.

By using the CAP1296-1-SL-TR, users can take advantage of cost- effective solutions to simplify their design, decrease the complexity and shorten the system development cycles for their products with the award-winning family of capacitive sensors and controllers.

Working Principle

The CAP1296-1-SL-TR consists of a capacitive touch controller and a capacitive touch sensor. It works on a principle commonly referred to as impedance measurement. In this process, an alternating electric current is injected into a capacitive touch sensor while detecting only a very small impedance change caused by a user’s finger.

The CAP1296-1-SL-TR is a fully integrated capacitive touch controller supporting a wide variety of features including proximity sensing, multi-touch support, and low noise operation. It employs the inductive-touch method, which eliminates the need for a battery or external voltage source, greatly simplifying the design and eliminating the need for additional parts.

The CAP1296-1-SL-TR has an on-chip self- calibration algorithm which helps in compensating for any environmental factors like temperature, humidity, EMI interference, aging, and other contact influencing factors. It has advanced touch recognition capabilities and can process up to 16 simultaneous touches in a single frame. The controller can detect a touch with as little as 0.2 pF of capacitance, as well as detect a touch even through a glove up to 10mm thick.

The CAP1296-1-SL-TR’s integrated charge pump provides a high signal-to-noise ratio and excellent rejection of interference from other devices, providing superior signal stability over temperature and environmental changes. It has a low-power operating mode that reduces power consumption to as little as 4 microamps. In addition, the CAP1296-1-SL-TR is also compatible with the most popular microcontrollers and digital signal processors (DSPs), such as Arm Cortex and TI DSPs.

In conclusion, the CAP1296-1-SL-TR is a highly integrated capacitive touch controller and sensor with support for a wide range of applications in a variety of markets. It is a cost-effective solution to simplify design, decreasing complexity and reduce the development time for products utilizing the award-winning family of sensors and controllers.

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