QT401-ISSG Atmel, QT401-ISSG Datasheet
QT401-ISSG
Specifications of QT401-ISSG
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QT401-ISSG Summary of contents
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... ITO (Indium Tin Oxide) overlays on top of various displays. - +85 LQ Appliance controls Touch-screens AVAILABLE OPTIONS T SO- QT401-ISG QS ™ LIDE OUCH VDD 1 SDO 2 QT401 /SS 3 SCLK 4 SDI 5 SNS1A 6 SNS1B 7 Automotive controls TSSOP-14 QT401-ISSG Copyright © 2004 QRG Ltd QT401 R10.04/0505 QT401 IC LIDER 14 GND 13 DRDY 12 DETECT 11 PROX 10 N/A 9 SNS2A 8 SNS2B ...
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... Operation The QT401 uses a SPI slave mode interface for control and data communications with a host controller. Acquisition timings and operating parameters are under host control; there are no option jumpers and the device cannot operate in a stand-alone mode. The positional output data is a 7-bit binary integer (0...127) indicating position from left (0) to right (127). Like all QProx™ ...
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... DETECT O Active high when slider is touched. May be left unconnected. Note (1) 13 DRDY O Data ready output. Goes high to indicate it is possible to communicate with the QT401. Note (1) 14 VSS Ground Negative power pin Note (1): Pin floats briefly after wake from Sleep mode. setting of drift compensation in Free-Run mode. See also Section 3 ...
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... Table 1-2 Recommended Cs vs. Materials Thickness, Acrylic ε ε ε ε =2.8) R 0.4 10nF 22nF 0.8 47nF 1.5 2.5 100nF 3 4.0 4 Borosilicate glass ε ε ε ε ( =4.8) R 5.6nF 10nF 22nF 39nF 47nF 100nF QT401 R10.04/0505 ...
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... See also Section 2.2. 2.4 Power Supply The usual power supply considerations with QT parts applies also to the QT401. The power should be very clean and come from a separate regulator if possible. This is particularly critical with the QT401 which reports continuous position as opposed to just an on/off output ...
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... Do use a ground plane under and around the QT401 itself, back to the regulator and power connector (but not beyond the Cs capacitor). Do not place an electrode (or its wiring) of one QT401 device near the electrode or wiring of another device, to prevent cross interference. Keep the electrode (and its wiring) away from other traces carrying AC or switched signals ...
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... DRDY Line The DRDY line acts primarily as a way to inhibit the host from clocking to the QT401 when the QT401 is busy. It also acts to signal to the host when fresh data is available after a burst. The host should not attempt to clock data to the QT401 when DRDY is low, or the data will be ignored or cause a framing error ...
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... Section 2.3). Executing a calibrate command (0x01) cancels the End Calibrate mode, and therefore the End Calibrate command has to be performed again if desired. However, once the 0x01 / 0x02 command sequence is performed, it should QT401 R10.04/0505 ...
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... Note: the Null can be replaced by an empty /SS pulse if there is no need for fast updates automatically on power-up) a. 0x00 (Null) - all commands except: b. 0x03 (Drift compensate) - replace every nth Null command where typically there is ever an error bit set, send a 0x01 and optionally, a 0x02. QT401 R10.04/0505 ...
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... Variable parameter under host control kHz Modulated spread-spectrum (chirp) µs Modulated spread-spectrum µs ms kHz Units Notes counts Both prox and touch detection Host controlled variable Host controlled variable % % of threshold setting % % of threshold setting % % of bursts; host controlled % Depends on element linearity, layout QT401 R10.04/0505 + +125 O C ...
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... Typical Position Response - Raw Cal (0x01) Only 120 100 4.7 Typical Position Response - After Auto End Cal (0x01 + 0x02) 120 100 DISTANCE FROM END (mm DISTANCE FROM END (mm 100 100 QT401 R10.04/0505 ...
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... A A1 MILLIMETERS MAX MIN NOM MAX 14 0.65 0.043 1.10 0.006 0.05 0.10 0.15 0.256 6.25 6.38 6.50 0.177 4.30 4.40 4.50 0.201 4.90 5.00 5.10 0.028 0.50 0.60 0. 0.008 0.09 0.15 0.20 0.012 0.19 0.25 0. QT401 R10.04/0505 ...
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... Ordering Information PART NO. QT401-ISG QT401-ISSG lQ TEMP RANGE PACKAGE - + SO- TSSOP-14 13 MARKING QT401 QT401 QT401 R10.04/0505 ...
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... Product Pictures Figure 5.1 - E401 Eval Product (front, back, pcb rear) lQ Figure 5 Clear ITO Slider Sensing Strip (Courtesy Click-Touch NV, Belgium) 14 QT401 R10.04/0505 ...
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... NOTES lQ 15 QT401 R10.04/0505 ...
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Tel: +44 (0)23 8056 5600 Fax: +44 (0)23 80565600 This device covered under one or more of the following United States and international patents: 5,730,165, 6,288,707, 6,377,009, 6,452,514, 6,457,355, 6,466,036, 6,535,200. Numerous further patents are pending which may apply ...