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IQS133 Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers |
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IQS133 Datasheet(HTML) 2 Page - List of Unclassifed Manufacturers |
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2 / 24 page  IQ Switch ® ProxSense ® Series Copyright © Azoteq (Pty) Ltd 2012. IQS133/133Z Datasheet Page 2 of 23 All Rights Reserved. Revision 1.6 October 2012 Functional Overview 1 Introduction The IQS133 is a three channel capacitive proximity and touch sensor featuring internal voltage regular and reference capacitor (Cs). The device has three dedicated input pins for the connection of the sense electrodes (Cx). Three output pins for Touch (for each channel) detection and one output (POUT) for proximity detection. The output pins can be configured as Logic outputs or in a serial data streaming option on TO0. The device automatically tracks slow varying environmental changes via various filters, detect noise and has an Automatic Tuning Implementation (ATI) to tune the device for optimal sensitivity. 1.1 Pin-outs 1. GND 2. CX0 3. CX1 4. VDDHI 5. VREG 10. TO2 9. CX2 8. TO1 7. TO0/DATA 6. PO/RFIN Figure 1.1 IQS133 Pin-outs Table 1.1 IQS133 Pin-outs. Pin Standalone Streaming Function 1 GND GND Ground 2 CX0 CX0 Sense Electrode 3 CX1 CX1 Sense Electrode 4 VDDHI VDDHI Power Input 5 VREG VREG Regulator Pin 6 PO Proximity Output 7 TO0 DATA Touch Output 8 TO1 Touch Output 9 CX2 CX2 Sense Electrode 10 TO2 Touch Output 1.2 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) 3V to 5.5V 2 Analogue Functionality The analogue circuitry measures the capacitance of the sense electrodes attached to the Cx pins through a charge transfer process that is periodically initiated by the digital circuitry. The measuring process is referred to as a conversion and consists of the discharging of Cs and Cx, the charging of Cx and then a series of charge transfers from Cx |
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