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QST608ST1 Datasheet(PDF) 8 Page - STMicroelectronics |
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QST608ST1 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 51 page QST touch sensing technology QST108 8/51 3 QST touch sensing technology 3.1 Functional description QST devices employ bursts of charge-transfer cycles to acquire signals. Burst mode permits low power operation, dramatically reduces RF emissions, lowers susceptibility to RF fields, and yet permits excellent speed. Signals are processed using algorithms pioneered by Quantum which are specifically designed to provide reliable, trouble-free operation over the life of the product. The QST switches and charge measurement hardware functions are all internal to the device. An external CS capacitor accumulates the charge from sense-plate CX, which is then measured. Larger values of CX cause the charge transferred into CS to rise more rapidly, reducing available resolution. As a minimum resolution is required for proper operation, this can result in dramatically reduced gain. Larger values of CS reduce the rise of differential voltage across it, increasing available resolution by permitting longer QST bursts. The value of CS can thus be increased to allow larger values of CX to be tolerated. The device is responsive to both CX and CS, and changes in either can result in substantial changes in sensor gain. Figure 2. QTouch™ measuring circuitry 3.2 Spread-spectrum operation The bursts operate over a spread of frequencies, so that external fields will have minimal effect on key operation and emissions are very weak. Spread-spectrum operation works with the Detection Integrator mechanism (DI) to dramatically reduce the probability of false detection due to noise. Ai12569 SNS_SCKn SNSK_SCKn Sense capacitor CS (a few nF) Cx (~20 pF) CT (~5 pF) Earth Serial resistor RS (10 kΩ) |
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