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IQS128L Datasheet(PDF) 4 Page - List of Unclassifed Manufacturers |
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4 / 33 page IQ Switch® ProxSense® Series Copyright © Azoteq (Pty) Ltd 2011 IQS128 & IQS128LP Datasheet v2.4 Page 4 of 33 All Rights Reserved November 2012 1 Overview 1.1 Device variations Functionality Device Package DYCAL LP modes RF Noise Detection Pulse on CTRL (Input) DYCAL Output ATI Base Touch Debounce Release Threshold Filter operation Block ATI IQS128 TSOT23-6 75% Normal - - Available Reseed TOUT 4 values 3 IQS128L DFN8(2x3) 75% & 87.5% Updated 3sec after exiting TM 4 Power Modes - Re-ATI POUT or TOUT 8 values 2 Please note: Except for the functional variations stated above, there also exist differences between the proximity and touch thresholds for the IQS128L version. More on this in Sections 6.4 & 6.5. 1.2 Device The IQS128 and IQS128L ICs will be referred to as IQS128/IQS128L throughout the datasheet, unless they have different functionality, where it will be explicitly stated and explained. The IQS128/IQS128L is a single channel capacitive proximity and touch device which employs an internal voltage regulator and reference capacitor (Cs). The IQS128/IQS128L device has a dedicated pin for the connection of a sense electrode (Cx) and output pin for proximity and touch events on OUT. The polarity of the output pins can be configured. A 1-wire open drain data streaming protocol is implemented for debugging purposes. Special device configuration can be done by setting one time programmable (OTP) options. The device automatically tracks slow varying environmental changes via various signal processing algorithms and has an Automatic Tuning Implementation (ATI) algorithm to calibrate the device to the sense electrode. DYCAL™ (Dynamic Calibration) is a special form of hysteresis that can track slow varying environmental change even while the sensor is in a touch state. The charge transfer method of capacitive sensing is employed on the IQS128/IQS128L. (The charge transfer principle is thoroughly described in the application note: “AZD004 - Azoteq Capacitive Sensing”.) 1.3 Operation The device has been designed to be used in applications where proximity is required and touch conditions can prevail for an extended period of time which may result in uncompensated drift in conventional capacitive sensors. A low threshold is used to detect the proximity of an object, with a higher threshold for touch detection. Dynamic Calibration is performed when a TOUCH condition is detected for longer than TDYNACAL. The hysteresis algorithm will now check for the release condition of the touch, while still tracking environmental changes 1.4 Applicability All specifications, except where specifically mentioned otherwise, provided by this datasheet are applicable to the following ranges: Temperature:-40C to +85C Supply voltage (VDDHI): 2.95V to 5.5V |
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