qt511 Quantum Research Group, qt511 Datasheet
qt511
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qt511 Summary of contents
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... The output of the QT511 can also be used to create discrete controls in a circle, by interpreting sets of number ranges as buttons. For example, the number range 0..19 can be button A, 30..49 button B, 60..79 button C etc. Continuous wheel action and discrete controls can be mixed on a single element, or, the element can be reinterpreted differently at different times, for example when used below or on top of an LCD to act as a menu input device that dynamically changes function in context ...
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... Cross-talk suppression: If two or more QT511’s are used in close proximity, or there are other QTouch™ type device(s) close by, the devices can interfere strongly with one another to create position jitter or false triggering ...
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... DETECT O Active high touch detected. May be left unconnected. Note (1) 13 DRDY O Data ready output. Goes high to indicate it is possible to communicate with the QT511. Note (1) 14 VSS Ground Negative power pin Note (1): Pin floats ~400µs after wake from Sleep mode. DETECT pin can be used to wake up the host when it goes high upon touch ...
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... Figure 1-3 E510 PCB Layout (Applies also to QT511) Note: During calibration, the device cannot communicate. DRDY will remain low during this interval. 1.7 Sensitivity Setting The sensitivity of the slider area to finger detection is dependent on the values of the three Cs capacitors (Section 2.2) and the threshold setting (Section 3.3.5). Larger values ...
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... During development it is wise to first design a regulator onto the PCB just for (and next to) the QT511, but allow for ‘jumpered out’ development it is clear that there are no problems with false detection or ‘angle noise’ even without a regulator just for the QT511, then the regulator can be safely omitted ...
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... SPI devices (master or slave) to talk over the same bus. There should be one dedicated /SS line for each QT511 from the host controller. A DRDY (‘data ready’) line is used to indicate to the host controller when it is possible to talk to the QT511. ...
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... DRDY Line The DRDY line acts primarily as a way to inhibit the host from clocking to the QT511 when the QT511 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 QT511 when DRDY is low, or the data will be ignored or cause a framing error ...
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... This command is used to read the current status of the QT511. In particular it is used to detect if there is a sensing error caused by a calibration or power- bad time, ie when a finger is on the sensing wheel and thereafter removed. The reported bits are as follows: TABLE 3-1 - Command Summary ...
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... Null command where typically 0x04 (Error status) - use after any detection just after a calibration or power-up to see if there is a calibration error. Note: the Null can be replaced by an empty /SS pulse if there is no need for fast updates. 9 QT511-ISSG R6.01/1005 ...
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... Variable parameter under host control kHz Modulated spread-spectrum (chirp 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 QT511-ISSG R6.01/1005 + +125 O C ...
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... D 0.193 0.197 0.201 L 0.020 0.024 0.028 0.004 0.006 0.008 B 0.007 0.010 0.012 PACKAGE TEMP RANGE TSSOP- MILLIMETERS MIN NOM MAX 14 0.65 1.10 0.05 0.10 0.15 6.25 6.38 6.50 4.30 4.40 4.50 4.90 5.00 5.10 0.50 0.60 0. 0.09 0.15 0.20 0.19 0.25 0. MARKING 0 C QT511 QT511-ISSG R6.01/1005 ...
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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 corresponding 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 ...