E3B USER'S GUIDE. for QT310 / QT320 QProx IC evaluation and development Overview. Fast Start

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1 E3B USER'S GUIDE for QT310 / QT320 QProx IC evaluation and development Overview The E3B board works with Quantum s QT310 and QT320 QProx ICs. Either device can be inserted into the 8-pin DIP socket. QT310 - single-channel device that uses only the QTouch-1 sense pad. QT320 - two-channel device that uses both touch pads. Both parts use the on-board header strip for feature cloning of setups or uploading and downloading of information to and from a host such as a PC. The board and these two series of devices are compatible with QT3View windows software. For detailed information about the ICs for this board please refer to the QT310 and QT320 datasheets (or datasheets for future devices in these series). Fast Start To begin using the board right away: 1. Insert 2x AAA alkaline batteries into the battery holders. Make sure the small power switch is off. If the QT310 is being tested, remove C2 (it is socketed). 2. Hold the board in one hand on the battery side of the board, keeping your fingers away from the QTouch pad areas, and generally the entire lower right quadrant of the board on either surface to prevent the IC from calibrating to your fingertips. 3. Turn on the power switch. 4. QT320 chip installed: Touch either the 'QTouch-1 or QTouch-2' pad QT310 chip installed: Touch the 'QTouch-1 pad The corresponding LED will change state when touched, in a way that depends on how the chip was setup using the cloning adaptor (see also factory defaults). If you are touching on or around the touch pads when you turn the switch on, it will calibrate to ignore your fingers. If this happens, take your fingers away and cycle the power switch again. Because of Kirchoff's Current Law ("all currents must return to their origin", which also applies to capacitive fields), the sensor is less sensitive if you are not holding it or if the board's ground is not electrically coupled to something else. Thus, placing the board on your desk will result in less sensitivity than if you hold it by the batteries or connect the board's ground to something larger (or to earth ground). Unstable operation will occur if you simply place the board on a desktop and try it, unless rubber feet are used. The board will rock when touched leading to strong variations in background signals which will affect operation. Make sure the board is firm and cannot move when touched. An external piece of metal foil or a wire loop can be connected to the board and attached to the rear of a surface of your choice (plastic, glass, wood, or stone will all work fine) to create fully self-calibrating touch buttons (be sure to connect the board's ground to something else for best results - or, power from an external power supply. External power - please note! When using external power, limit the voltage to 5v DC max, using the marked connection points. Be sure to remove the batteries first, or you may cause an explosion or leakage hazard as the batteries will try to charge up from the external supply!

2 Board Details Schematic Diagrams Please refer to the schematic diagrams in this guide. The QT310 and QT320 have different pinouts and make different uses of the board wiring. Please note that the QT310 senses on key Touch_1 but outputs on Out2 / LED2. Batteries Use 2x AAA alkaline batteries for best performance. Power consumption depends on the operating mode chosen. Remove batteries when using external power! External Power Connections The provided connection points (+PWR, GND) can be used to power the board. The voltage should be between +2.5 and +5 volts DC, regulated. Power should be free from switching noise and short-term fluctuations for best performance. Almost any linear regulator will work. Be sure not to share this power with other circuits that may inject noise or supply fluctuations into the board, as erroneous operation will result (example: relays, digital logic, etc). If external power is used, be sure to remove the batteries! 'Out' Connections The Out pins (Out1, Out2) are driven directly by the IC. Be careful not to load these pins excessively, keeping source or sink current to under 2mA. The devices are designed to drive only small loads. Depending on the cloned Setups of IC, the Out pins may be set to either active high or active low. Out2 is used only by the QT310. Both Out1 and Out2 are used by the QT320. It is not advised to connect an external pull-up resistor to a voltage source other than the same source powering the board. An external voltage source can back-feed the board with current and attempt to charge the batteries via the internal clamp diodes in the device, and in general is not good practice. 'Ext' Sense Connector Pads These pins (EXT1, EXT2) provide a way to connect the device to external sensing electrodes. The load should have low capacitance (Cx) for best results. High Cx will decrease apparent sensitivity. Shielded cable can be tolerated over short distances, usually with an increase in C1 or C2 to compensate for the increased Cx loading. EXT2 is not used by the QT310. C1 / C2 Capacitors C1 and C2 (referred to generically as Cs or sample capacitors) are socketed and can be replaced for experimentation. Generally, higher values of Cs will increase sensitivity. This increase is proportional to Cs. Use good grade capacitors (avoid cheap ceramic capacitors in favor of plastic film types or at worst, X7R 5% ceramic for best results). A typical minimum value of Cs is 2nF. C2 is not used for the QT310 and should be removed when using the QT310 to allow the Sync pin functions to operate properly. C1 and C2 are both required for the QT320.

3 C3 Balance Capacitor The C3 balance capacitor exists to balance the sensitivity of the two sensing channels to make them equal. Without this capacitor, Touch 1 will appear more sensitive than Touch 2. The inequality can be used to advantage in some applications. The other methods of making the channels appear equal include a) reducing C1 relative to C2, and b) changing the trip-point threshold via the cloning process (or both). C3 is a 5pF capacitor which could also be implemented by intentionally adding some stray Cx to channel 1 in a new design. C3 can be removed when evaluating the QT310, to make the device more sensitive. R3 / R4 Series Resistors These resistors reduce currents induced by ESD transients to safe levels. They also roll off the edges of the QT pulses thus reducing RF harmonics. R3 and R4 values are not critical but they should not be so large that they interfere with sensing. Typical values can range from 1K to 47K. When connecting the EXT pins to a larger Cx load, it may be necessary to reduce one or both of these resistances. If lowering the resistor increases sensitivity, the resistor value is too high. LEDs The LEDs are driven from the IC through limiting resistors. Depending on whether the output(s) have been configured as active-low or active high, the LEDs will be either normally off or on respectively. The QT320 drives both LEDs while the QT310 drives only D2 via Out2. Calibration Push Button (QT310 only) This push button is only used for the QT310. It can perform two different functions depending on the QT310 s mode. If the QT310 is used in BG or OBJ mode, the push button is used to perform a selfcalibration. If the QT310 is configured with a toggle latch output, the push button is used to reset Out2. The Toggle latch output cannot be used at the same time as the BG or OBJ modes. OUT1 / CAL Connection (QT310, QT320) The Out1/Cal connection is directly wired to IC pin 1. QT310: This pad is used for an external input to either initiate self-calibration or to reset the output toggle latch, depending on the device Setups. QT320: This pad is the Out1 connection terminal corresponding to the Touch 1 pad. Sync In / Out Connections (QT310 only) The Synchronization pads ( Sync Out and Sync In ) can be used to daisy chain boards in series, in order to allow multiple devices to operate in close proximity without cross-interference. To daisy chain two or more QT310 s, connect the Sync Out pin of one device to the Sync In pin of the next. It is possible to run either open or closed loop; in both cases the master device will control the scan speed. Alternatively each device can be centrally triggered in sequence from a single source such as a microcontroller. When using external pulse sources be certain the pulses do not exceed the supply rail of the QT part to prevent false operation or damage. J2 Clone Connector J2 is the clone header. When the QTM300CA is used to communicate with the part, the ribbon cable plugs into J2. The striped wire of the cable goes to the header pin marked with a white square (Pin 1).

4 Figure 1 - E3B With QT310 Installed Figure 2 - E3B With QT320 Installed

5 Figure 3 - PCB Silk Layer Figure 4 - PCB Component Layer Figure 5 - PCB Solder Layer

6 Quantum Research Group Ltd. 1 Mitchell Point, Ensign Way Hamble, Southampton SO31 4RF Great Britain Quantum Research Group Ltd. 651 Holiday Drive Suite 300 Pittsburgh, PA USA Tel: +44 (0) Fax: +44 (0) sales@qprox.com Copyright 2002 QRG Ltd. Patents and Patents Pending Worldwide Tel: +1 (412) Fax: +1 (412) sales@qprox.com Use of this device in a product designed for human health or safety is authorized only with a written release signed by an officer of Quantum Research Group.

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