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AT42QT2100 Datasheet(PDF) 6 Page - ATMEL Corporation |
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AT42QT2100 Datasheet(HTML) 6 Page - ATMEL Corporation |
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6 / 44 page  6 AT42QT2100 [DATASHEET] 9554E–AT42–01/13 2. Overview 2.1 Introduction The AT42QT2100 (QT2100) is an easy-to-use sensor IC based on the Atmel-patented charge-transfer (QT™) principles for robust operation and ease of design. This device has many advanced features which provide for reliable, trouble-free operation over the life of the product. In particular the QT2100 features advanced self- calibration, drift compensation, and fast thermal tracking. The QT2100 can tolerate some fluctuations in the power supply, and in many applications will not require a dedicated voltage regulator. The QT2100 is capable of detecting near-proximity or touch on up to seven electrodes and a slider/wheel. It allows electrodes to project sense fields through any dielectric such as glass or plastic. These electrodes are laid out as a scroller (slider or wheel), plus seven additional independent keys. Each key channel can be tuned for a unique sensitivity level by simply changing a corresponding external Cs capacitor, whereas the slider/wheel sensitivity can be changed dynamically through SPI commands. Any number of key channels can be optimized for operation as hand proximity sensors by increasing the sensitivity for the corresponding channel. Note: There are special conditions if using AKS (see Section 4.3.6 on page 15). The slider/wheel uses a simple, inexpensive sensing element between three connection points. The QT2100 can report a single rapid touch anywhere along the sense elements, or it can track a finger moving along the slider/wheel's surface in real time. By using the charge-transfer principle, this device delivers a level of performance clearly superior to older technologies yet is highly cost-effective. Spread-spectrum burst technology provides superior noise rejection. 2.2 Burst Operation The device operates in burst mode. Each key is acquired using a burst of charge-transfer sensing pulses whose count varies depending on the value of the sense capacitors (CsA1 to CSA3 and CsB1 to CSB7) and the load capacitance Cx (finger touch capacitance and circuit stray capacitance). The channels’ signals are acquired using three successive bursts of pulses: Burst 1: B1, B2, B3 Burst 2: B4, B5, B6, B7 Burst 3: A1, A2, A3 where B1 to B7 are the individual key sensors and A1 to A3 are the slider/wheel sensors. Bursts operate in sequence and occur one after the other with minimum delay. During each burst the DRDY pin is held low. The groups are separated by an interval of 500 µs when DRDY is held high to signal an appropriate time for SPI communications. Communications may be carried out at any time, however, regardless of the state of the DRDY pin. 2.3 User Interface Layout and Options The QT2100 can sense through all common plastics or glass or other dielectric materials up to 10 mm thick. It can be used to implement a linear slider or rotary scroll wheel plus seven additional discrete keys. The slider or wheel indicates absolute positions. 2.4 Slider and Wheel Construction The QT2100 can be connected to a linear slider element (see Section 3.5 on page 10) or a wheel. Selection of linear operation or wheel is set through an SPI command. |
Similar Part No. - AT42QT2100_14 |
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Similar Description - AT42QT2100_14 |
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