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QT1100A Datasheet(PDF) 3 Page - Quantum Research Group |
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QT1100A Datasheet(HTML) 3 Page - Quantum Research Group |
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3 / 42 page  1 Overview The QT1100A is a 10 touch-key sensor IC based on Quantum’s patented charge-transfer 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. It can operate in either a standalone mode or under host control via a serial interface. Output options include UART and SPI serial types and parallel scanport. In any interface mode, a low-cost optional EEPROM can be used to determine the device configuration using a stored Setup block. FMEA self-testing: This part has been designed specifically for demanding appliance applications requiring FMEA certification. The part has many advanced features that check for and report failures, to allow the designer to create a safer product. It also features two robust serial interfaces with sophisticated CRC error checking to permit validation of commands and responses in real time. Burst mode: The device operates in ‘burst mode’. Each key is acquired using a burst of charge-transfer sensing pulses whose count can vary tremendously depending on the value of the reference capacitor Cs and the load capacitance Cx. The keys (also called ‘channels’) are acquired time sequentially within fixed timeslots whose width can be controlled by user-defined Setups. Self-calibration: On power-up, all keys are self-calibrated within a few hundred milliseconds to provide reliable operation under almost any set of conditions. Auto-recalibration: The device can time out and recalibrate each key independently after a fixed interval of continuous detection, so that the keys can never become ‘stuck on’ due to foreign objects or sudden influences. After recalibration the key will continue to function normally. Drift compensation operates to correct the reference level of each key slowly but automatically over time, to suppress false detections caused by changes such as temperature, humidity, dirt and other environmental effects. 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 ‘detect integrator’ (DI) mechanism to dramatically reduce the probability of false detection due to noise. Detection confirmation occurs by means of a ‘detect integrator’ mechanism that requires multiple confirmations of detection over a number of key bursts. The bursts operate at alternating frequencies, so that external fields will have a minimal effect on key operation. This spread-spectrum mode of operation also reduces RF noise emissions. The device also features the ability to acquire and lock onto touch signals very rapidly, greatly improving response time through the use of the ‘fast detect integration’ or ‘Fast-DI’ feature. Sync Mode: The QT1100A features a Sync mode to allow the device to slave to an external signal source, such as a mains signal (50/60Hz), to limit interference effects. This is performed using a special Sync pin. Low Power Sleep Mode: The device features a low power Sleep mode for microamp levels of current drain when not in use. The part can be put into sleep for a certain percentage of the time, so that it can still respond to touch but with lower levels of current drain. AKS™ Adjacent Key Suppression works to prevent multiple keys responding to a single touch, a common complaint of capacitive touch panels. This system operates by comparing signal strengths from keys within a defined group to suppress touch detections from those with a weaker signal change than the dominant key. The QT1100A allows any AKS grouping of two or more keys, under user control. Unique to this device is the ability for the designer to treat each key as an individual sensor for configuration purposes. Each key can be programmed separately for sensitivity, drift compensation, recalibration timeouts, adjacent key suppression, and the like. The device is designed to support FMEA-qualified applications using a variety of checks and redundancies. Among other checks the component uses CRC codes in all critical communication transfers, and can also output error condition codes via redundant signaling paths. LQ 3 Copyright © 2003-2005 QRG Ltd QT1100A-ISG R3.02/1105 |
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