User Manual
Contents
1. 2 Note amp Functions can not be used at the same time TYPICAL SETTINGS POL ON AKS 0 ON All others set to OFF ERI TEE 7225 39 9 EED Applications Pseudo slider control toggle on off keypad movement detector Sync Mode Active Fast Detect Mode Active Start Point All LED s off AKS off OUT D ON AKS 0 ON AKS_1 ON All others set to OFF 57 25 EN Applications Low light environments slider control toggle switch keypad Sync Mode Active Fast Detect Mode Active Start Point All LED s on AKS Active Global Mode AKS Active 2 x 4 TYPICAL SETTINGS SL_1 ON POL ON AKS_1 ON All others set to OFF A a qaa cdd etc 7890 1 Applications Portable appliances mobile telephone remote control Low Power Mode On 200mS Fast Detect Mode Off Start Point All LED s off Sync LP should be toggled after every key touch to mimic the command from a micro controller TROUBLESHOOTER Does Not Work Power supply too low or connected incorrectly e g No Power LED illuminated Keys Not Sensitive Enough Keys not calibrated properly e g Detect LED does not gt Recalibrate or let stand for up to 10 seconds to let drift illuminate when key is touched compensation wo2. 9 8 916121 nn 98013 Figure 5 Silkscreen Layer 0 lt CO zt S a HONOL 30 NOISIA 9 The QT1080 is designed for maximum flexibility and can be reconfigured to accommodate several options These can be set by toggling or adjusting the switches on SW1 Identification d SL 1 OFF SL 0 OFF OUT D OFF POL ON MOD 1 OFF MOD 0 OFF AKS 1 OFF AKS 0 ON NC OFF SYNCILP OFF Sync Mode SL 0 ON SL 1 OFF allows synchronize acquire bursts to an external signal source such as mains frequency to suppress interference such as mains frequency or to synchronize more than two QT parts with Sync facility Low Power Mode Allows the device to enter a slow mode with very low power consumption on start up in one of three response time settings When a key is touched the QT1080 goes into Sync mode wakes up until the host requests otherwise When fitted in a system there will be a pulse from the host micro controller asking for the QT1080 to go back into LP mode For the purpose of this demonstration unit the SYNC LP switch can be toggled to simulate this signal SL_0 SL 1 Response Time ON OFF 120 ms OFF ON 200 ms ON ON 360 ms OPTIONS Maximum ON duration setting Determines how long a key touch can be sensed before it is reset The Maximum ON d
3. User Manual The New Vision of Touch E1080 User Manual BOARD CONSTRUCTION 3 Front Cover Double sided adhesive E1080 PCB assembly Rear Cover M3x6 C sk Posi Screws Self adhesive feet a RUNNING THE E1080 To run the E1080 1 Place the E1080 on a table touch side up 2 Connect the 9V battery making sure your fingers are clear of the touch areas to allow proper no touch calibration The E1080 is now ready to use Touch the keys to light the LEDs A continuous touch of 10 seconds factory settings as received will cause the key to recalibrate Releasing the key after such an event and waiting a few seconds will cause the key to recalibrate yet again allowing the key to function normally thereafter OVERVIEW The E1080 is a stand alone module which facilitates the evaluation of QT1080 ISG by allowing easy access to the various functions features and options which the IC provides QT1080 ISG is a cost effective versatile chip which is aimed at a broad base of uses from portable devices such as mobile phones or MP3 players through to home appliances and automotive applications The option settings on the E1080 allow the user to investigate the most appropriate settings for their applications prior to committing to custom PCB design The E1080 also provides an interesting example of back lighting using an innovative light guide assembly Increasingly capacitive user interface technology
4. 2 i ER 20 e cit 2 2 m aromas A ue ze LEM ceps KEY4 RU E 15 Su oerecr 24 5 10K ce R6 PA as Ra 224 voo KEYS yoo Aik A RAB 19 er Rz 18 22 R28 KEYS 16 3 V ma E esi T 700k E R16 T8nF 22K NF Ia 8 2K 255 Sx ui nel RU 323 ar asa sc MN 5 aaa ge yoo a ss vin B uF 5 us ms m m sis sis sie ze xis xe zs zs si alg ag sie sis gig alg VIN sog VPD GND GND GND TEL Telp 3 C13 14 DEFAULT SW1 SETTINGS iur 1 tur Dn sx lax ex sx oy ss ux 8 65 83 as SS 2E sss 2 953 352288590 8 es 3388 rain Relief P 868987654521 27724 T Ceble Strain Relief Point kK E 2 505 gda sde wla ol gla ale sl bie s B 2 RW 8 sa 22V Bye l al BV EESEEESEEE 1 5585555555 4 Top Copper Layer 0000000 320 525555550555 lt 555 0050550 005 060506060 5 2500 0500 0505050 060 004 ER 5 RR er 42 22 254 29 29 290 ROI 2 EL X EL 9290909099 ER RR SEE 00 0 RN 0 lt gt 2 PX 5 x 9 igure F 3 Bottom Copper Layer igure F e ssi ever Bupued sueyod puo
5. T 8 OUT 5 3 OUT 0 9 OUT 6 4 OUT 1 10 OUT 7 5 OUT 2 11 GND 6 OUT 3 12 VIN SENSITIVITY The sensitivity of the keys has been tailored to match the fitted plastic front panel and keypad size and shapes To make a key more sensitive increase the value of its corresponding Cs capacitor see chart below To make it less sensitive decrease it s Cs value Only use 5 or 10 X7R ceramic capacitors most other types are not sufficiently stable and give erratic results Sense Capacitor Values Key Cs Capacitor Factory Default 0 C1 12nF 1 C2 6 8nF 2 C3 22nF 3 C4 18nF 4 C5 18nF 5 C6 18nF 6 C7 22nF 7 C8 18nF SCHEMATIC Figure 2 Schematic Diagram WN INTERFACE HDR HaBar 12 YN la Wai i 2 es RaT e T P ou lt 17 E 2k 5 Ub E KEY 5 I 10K R2 ale ye S RD ELA rie EE A ASIK o6 Anto 4708 840 cs 19 28 IT 7 TT NIC TRI ca Ra 44 didus Tene 221 loss 2 A R4
6. combined with appropriate use of back lighting and imaginative front panel designs are providing product differentiation for leading edge developers We encourage you to experiment with the evaluation board and to contact us with any questions you may have through email or the online user forum The QT1080 scans the keys using bursts of charge transfer pulses Immediately after power up the signals from these bursts are used to calibrate the baseline reference values of the keys This makes the device highly adaptive to mechanical differences i e varying panel thickness The chip also performs drift compensation on a continuous basis so that the signals are constantly being adjusted at a slow rate to accommodate environmental factors The power up calibration process should be performed in an undisturbed neutral condition i e all fingers away from the keys and with the board situated in the location where it will be used Changes in location can change the amount of signal coupling between the back of the keypad and the local environment and thereby affect the sensitivity of the keys If the initial calibrations are in error allowing the board to settle for a few seconds will allow the drift calibration process to normalise the keys to the correct calibrated values The Q1080 features spread spectrum pulse modulation which heavily suppresses external noise effects while also suppressing radiated emissions This powerful feature provides for h
7. flagged as a stuck key and the QT1080 recalibrates it so that the corresponding LED will go out and the key will operate again as a normal key while suppressing the object i e a touch that caused the prolonged detection Only the stuck key is recalibrated as all electrodes operate independently The 10s timeout can be changed to 60s or infinite via switch SW1 The QT1080 features a low power LP mode for sub 30uA levels of current drain with a slower response to allow use in portable battery operated devices On detection of touch the QT1080 automatically reverts to its normal mode and asserts the DETECT pin active to wake a host controller The device remains in normal full acquire speed mode until another pulse is detected on its SYNC LP pin when it goes back to LP mode BOARD DETAILS The E1080 is a simple double sided PCB on industry standard FR4 material All parts are standard surface mount types Here is a brief description of some of the parts and features Keys Keys consists of capacitive electrodes formed using copper areas on the E1080 which project a capacitive field through the overlying dielectric acrylic panel material Electrodes Copper areas on the PCB which define the touch keys LEDs The board has one Power LED which remains on as long as the board is powered one Detect LED to indicate a key has been touched and one LED per key to indicate touch Keyboard J1 By cutting through Link
8. ighly reliable compliant operation over a wide variety of conditions OVERVIEW The chip also uses a Detect Integrator to reduce false detection by verifying that a key is reporting touch for 6 consecutive bursts if the device fails to detect a touch during any of these 6 signal samples the chip will not report a key touch on an Out pin Combined with spread spectrum operation the detect integration consensus filter provides a powerful mechanism to suppress false detections by external noise sources AKS Adjacent Key Suppression is a patent pending feature that can be enabled via jumper resistors AKS works by preventing multiple keys from responding to a single touch previously a limitation of close packed capacitive touch key arrays AKS operates by comparing signal strengths from keys within a specified group to suppress touch signals from those keys that have a weaker change in signal than that of the dominant key The QT1080 has two different AKS groupings selectable via option resistors SW1 on the E1080 Board These groupings are AKS operates in two groups of 4 keys AKS operates over all 8 keys Global AKS These two modes allow the designer to provide AKS while also providing for shift or function operations AKS may also be turned off to facilitate full multi touch operation In the AKS disabled setting all keys operate independently and simultaneously If a key is touched for longer than 10 seconds the key is
9. rk on the reference levels gt Power supply problem Air gap between PCB Adhesive Front panel y Back of board is too close to a ground plane Noisy or Noisy or unstable power supply Erratic Operation e g Detection of touch is gt Supply voltage is too low intermittent Cables or board too close to a strong noise source i e a power line or switcher Increase the distance from the noise source gt Place a grounded shield between the noise source and the E1080 4 GUANTUM ESEARCH www qprox com Corporate Headquarters 1 Mitchell Point Ensign Way Hamble Southampton SO31 4RF United Kingdom Tel 44 0 23 8056 5600 Fax 44 0 23 8045 3939 Email sales1 qprox com Development Team Matthew Trend John Dubery Keith Britton North America 651 Holiday Drive Bldg 5 300 Pittsburgh PA 15220 USA Tel Fax Palented and patents pending REV 100 1005
10. s LKO LK7 and connecting to J1 remote custom keys can be connected to the E1080 If the E1080 keys are required later Zero Ohm Resistors should be soldered at LKO LK7 and the connections at J1 must be removed Interface J2 The main interface connector of the E1080 board The pinout of this connector is shown in Table 1 The pin functions are as follows 1 SYNC SYNC is available in slow mode only and is used to synchronize the E1080 burst with an external falling edge signal often derived from a 50 or 60Hz source to suppress mains interference or to allow two or more QT1080 chips to synchronize to each other to prevent cross interference effects between the adjacent keys of different chips 2 DETECT DETECT can be used to wake a battery operated product following a human touch DETECT also indicates to a host when the binary coded output pins in that mode are show an active key 3 10 OUT 0 OUT 7 OUT pins are low when the corresponding key is inactive and high when active and are controlled by the QT1080 chip These lines also control the LEDs on the E1080 11 12 GND VIN Use 7VDC to 12VDC connected between the GND and VIN to power the E1080 board The battery snap feeds the same two connections and can also be used for power input The input is protected from incorrect polarity connection 8 BOARD LAYOUT Board Layout Interface J2 Pinout Pin Description Pin Description 1 SYNC 7 OUT 4 2 DETEC
11. uration operates on a key by key basis i e when one key is stuck on its re calibration has no effect on other keys Maximum ON Duration OFF OFF 10 Seconds ON OFF 60 Seconds OFF ON Infinite Adjacent Key Suppression AKS mode Prevents multiple keys from responding to a single touch There are two modes Two groups of 4 AKS_0 OFF AKS_1 ON or Global mode AKS_0 ON AKS_1 ON Note the first held key will hold until released regardless of any other key being touched Fast Detect Mode Response time of less than 15mS to respond Normal mode AKS_0 OFF AKS_1 OFF Fast Mode AKS_0 ON AKS_1 OFF Polarity setting A start point setting for all LED s off touch for on POL ON OUT D OFF or all LED s on and touch for off inverted POL OFF OUT_D ON Binary Output Mode It is possible to use all 8 outputs or use just three in Binary mode POL OFF OUT_D OFF where number of data lines are restricted for simplified wiring Refer to QT1080 datasheet for details Touch KEYO gt All LED s ON ch KEY1 gt KEYO LED OFF all other LED s ON ch KEY4 gt KEY2 LED OFF all other LED s ON ch KEY5 gt KEY2 and KEYO LED s OFF all other LED s ON ch KEY2 gt KEY1 LED OFF all other LED s ON ch KEY3 gt 0 and KEY1 LED s OFF all other LED s ON ch KEY6 gt KEY2 and KEY1 LED s OFF all other LED s ON ch KEY7 gt KEY2 and KEY1 LED s OFF all other LED s ON To
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