qt1101 Quantum Research Group, qt1101 Datasheet
qt1101
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qt1101 Summary of contents
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... MP3 players ! Mobile phones QT1101 charge-transfer (‘QT’) QTouch ten electrodes. It allows electrodes to project independent sense fields through any dielectric such as glass or plastic. This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts, adding high value to product designs. The devices are designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls, or anywhere a mechanical switch or button may be found ...
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... These two modes allow the designer to provide AKS while also providing for shift or function operations. If AKS is disabled, all keys can operate simultaneously. Outputs: The QT1101 has a serial output using one or two wires, RS-232 data format, and automatic baud rate detection. A simple protocol is employed. ...
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... Rising edge sync or LP pulse Vdd or Vss** See Table 1 Cs8 To Cs8 + Key To Cs9 To Cs9 + Key - key state has changed 100K✡ resistor to Vss Requires pull-up Requires pull-up to Vdd Input for 2W mode QT1101 R4.06/0806 Open Vdd - - - Open Open or Open Open or Open Open or Open Open or ...
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... Replace Css with 100K resistor 100K Vdd 32 2W DATA 100K Vdd 31 DATA 100K 30 Vdd /CHANGE 29 5 FAST-DETECT Off Enabled Off Off QT1101 R4.06/0806 SNS2 KEY 2 SNS1 KEY 1 10K SNS0 KEY 0 10K Rb1 Rb2 12K 27K 12K 22K 15K 27K Rb1 Rb2 15K ...
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... No Spread-spectrum: Replace Css with 100K resistor 100K 32 Vdd 2W DATA 100K Vdd 31 DATA 100K 30 Vdd /CHANGE 29 5 Enabled Off QT1101 R4.06/0806 R SNS2 KEY 2 10K SNS1 KEY 1 10K R SNS0 KEY 0 10K Rb1 Rb2 12K 27K 12K 22K 15K 27K Rb1 Rb2 ...
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... If /CHANGE is not used, the host would need to keep polling the QT1101 constantly, even if there are no changes in touch. Upon detection of a key, /CHANGE will pull low and stay low until the serial interface has been polled by the host ...
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... Auto baud rate detection takes place by having the host device send a specific character to the QT 1101, which allows the QT1101 to set its baud rate to match that of the host. One feature of this method is that the baud rate can be any rate between 8,000 and 38,400 bits per second ...
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... QT1101 (see Figure 2.1). The delay from the received stop bit to the QT1101 driving the 1W pin is in the range 1-3 bit periods, so the host should float the pin within one bit period to prevent a drive conflict. ...
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... To solve this problem, the QT1101 can also receive the ‘P’ character from the host on its ‘Rx’ pin separately from the 1W pin (Figure 2.4). The host need not float the Rx line since the QT1101 will never try to drive it. Following a ‘P’ on Rx, the QT1101 will send the same response pattern (Figure 2 ...
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... Notes ms kHz % Total deviation µ All 3 bursts 200ms LP setting ms End of touch baud Units Notes mA @ Vdd = 5.0 @ Vdd = 4.0 @ Vdd = 3.6 @ Vdd = 3.3 @ Vdd = 2.8 µA @ Vdd = 3.0; 200ms LP mode V/s Req’d for startup, w/o external reset ckt 7mA sink V 2.5mA source µA bits QT1101 R4.06/0806 ...
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... Threshold for decrease of Cx load 2 secs Time to recalibrate if Cx load has exceeded anti-detection threshold 6 samples Must be consecutive or detection fails 2 samples Must be consecutive or detection fails 10, 60, inf secs Option pin selected 2,000 ms/level Towards increasing Cx load 500 ms/level Towards decreasing Cx load 11 QT1101 R4.06/0806 ...
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... Idd Curves Cx = 5pF 4.7nF QT1101 Idd (norm al m ode 5.0 4.0 3.0 Rb1=12K Rb2=22K 2.0 1.0 Rb1=12K Rb2=27K 0.0 2.5 3 3.5 4 Vdd(V) QT1101 Idd (200m s response) µA 400 300 Rb1=12K Rb2=22K 200 100 Rb1=12K Rb2=27K 0 2.5 3 3.5 4 Vdd( 5pF 4.7nF QT1101 Idd (norm al m ode 5.0 4.0 3.0 2.0 Rb1=18K 1 ...
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... Vdd lQ 240 230 220 210 200 190 180 170 160 4.5 5 5.5 Response Time vs Vdd - 360ms Setting 430 410 390 370 350 330 310 290 2.5 3 3.5 4 Vdd 13 Response Time vs Vdd - 200ms Setting 2.5 3 3.5 4 4.5 Vdd 4.5 5 5.5 QT1101 R4.06/0806 5 5.5 ...
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... Note that there is no functional requirement for the large pad on the underside of the 32-QFN package to be soldered to the substrate. If the final application does require this area to be soldered for mechanical reasons, the pad(s) to which it is soldered to must be isolated and contained under the 32-QFN footprint only 0.90 0.02 0.05 0.25 0.32 0.20 REF - 5.00 5.10 - 3.65 5.00 5.10 - 3.65 0.50 - 0.40 0.50 - 0.075 14 QT1101 R4.06/0806 ...
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... Digit Run Number Identification All dimensions in millimeters 7.39 0.20 2.16 0.64 Typ 7.59 0.30 2.51 QRG Part No. QRG Revision Code 'YY' = Year of manufacture: 'WW' = Week of manufacture: 'G' = Green/RoHS Compliant 0.10 15.57 0.10 0.64 0 0.25 16.18 0.30 0. 48-SSOP QT1101-IS48G; 48 SSOP QT1101-IS48G © QRG 1976 R4 QProx TM <datecode#> DIMPLE Pin 1 QT1101 R4.06/0806 ...
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LQ Tel: +44 (0)23 8056 5600 Fax: +44 (0)23 8045 3939 This device is covered under one or more United States and corresponding international patents. QRG patent numbers can be found online at www.qprox.com. Numerous further patents are pending, which ...