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QT110 Dataheets PDF



Part Number QT110
Manufacturers QUANTUM
Logo QUANTUM
Description SENSOR ICs
Datasheet QT110 DatasheetQT110 Datasheet (PDF)

www.DataSheet4U.com lQ Less expensive than many mechanical switches Projects a ‘touch button’ through any dielectric 100% autocal for life - no adjustments required No active external components Piezo sounder direct drive for ‘tactile’ click feedback LED drive for visual feedback 2.5 ~ 5V single supply operation 10µA at 2.5V - very low power drain Toggle mode for on/off control (via option pins) 10s or 60s auto-recalibration timeout (via option pins) Pulse output mode (via option pins) Gain set.

  QT110   QT110


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www.DataSheet4U.com lQ Less expensive than many mechanical switches Projects a ‘touch button’ through any dielectric 100% autocal for life - no adjustments required No active external components Piezo sounder direct drive for ‘tactile’ click feedback LED drive for visual feedback 2.5 ~ 5V single supply operation 10µA at 2.5V - very low power drain Toggle mode for on/off control (via option pins) 10s or 60s auto-recalibration timeout (via option pins) Pulse output mode (via option pins) Gain settings in 3 discrete levels Simple 2-wire operation possible HeartBeat™ health indicator on output Active low (QT110), active high (QT110H) versions QT110 / QT110H QTOUCH™ SENSOR ICs Vdd Out Opt1 Opt2 1 8 Vss Sns2 Sns1 Gain QT110 2 3 4 7 6 5 APPLICATIONS Light switches Industrial panels Appliance control Security systems Access systems Pointing devices Elevator buttons Consumer electronics The QT110 / QT110H charge-transfer (“QT’”) sensor chips are self-contained digital ICs used to implement near-proximity or touch sensors. They project sense fields through almost any dielectric, like glass, plastic, stone, ceramic, and wood. They can also turn small metal-bearing objects into intrinsic sensors, making them respond to proximity or touch. This capability coupled with an ability to self-calibrate continuously leads to entirely new product concepts. These devices are designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical switch or button may be found; they may also be used for some material sensing and control applications provided that the presence duration of objects does not exceed the recalibration timeout interval. A piezo element can also be connected to create a feedback click sound. These ICs require only a common inexpensive capacitor in order to function. Average power consumption is under 20µA in most applications, allowing battery operation. The devices employ digital signal processing techniques pioneered by Quantum, designed to make them survive real-world challenges, such as ‘stuck sensor’ conditions and signal drift. Sensitivity is digitally determined for the highest possible stability. No external active components are required for operation. The devices include several user-selectable built-in features. One, toggle mode, permits on/off touch control for example for light switch replacement. Another makes the sensor output a pulse instead of a DC level, which allows the device to 'talk' over the power rail, permitting a simple 2-wire twisted-pair interface. Quantum’s unique HeartBeat™ signal is also included, allowing a host controller to continuously monitor sensor health. By using the charge transfer principle, these ICs deliver a level of performance clearly superior to older technologies in a highly cost-effective package. TA 00C to +700C 00C to +700C -400C to +850C -400C to +850C AVAILABLE OPTIONS SOIC QT110-IS QT110H-IS 8-PIN DIP QT110-D QT110H-D - lq ©1999-2004 Quantum Research Group QT110/110H R1.03/0604 1 - OVERVIEW The QT110 is a digital burst mode charge-transfer (QT) sensor designed specifically for touch controls; it includes all hardware and signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. Only a few low cost, non-critical discrete external parts are required for operation. Figure 1-1 Standard mode options +2.5 ~ +5 1 2 3 4 OUTPUT = DC TIMEOUT = 10 Secs TOGGLE = OFF GAIN = HIGH Vdd OUT SNS2 Figure 1-1 shows the basic QT110 circuit using the device, with a conventional output drive and power supply connections. Figure 1-2 shows a second configuration using a common power/signal rail which can be a long twisted pair from a controller; this configuration uses the built-in pulse mode to transmit output state to the host controller (QT110 only). 7 5 Cs 6 2nF - 500nF RE SENSING ELECTRODE OPT1 GAIN Rs Cx OPT2 Vss SNS1 1.1 BASIC OPERATION The QT110 employs low duty cycle bursts of charge-transfer cycles to acquire its signal. Burst mode permits power consumption in the low microamp range, dramatically reduces EMC problems, and yet permits excellent response time. Internally the signals are digitally processed to reject impulse noise, using a 'consensus' filter which requires four consecutive confirmations of a detection before the output is activated. The QT switches and charge measurement hardware functions are all internal to the QT110 (Figure 1-3). A single-slope switched capacitor ADC includes both the required QT charge and transfer switches in a configuration that provides direct ADC conversion. Vdd is used as the charge reference voltage. 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 apparent gain. The IC is highly tolerant of changes in Cs since it computes the signal thr.


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