QST108

      The QST108 is designed as capacitive touch sensor device and 8 keys with individual key state outputs or I2C interface.It is the ideal solution for the design of capacitive touch sensing user interfaces.
      QST108 has nine features.The first one is that it would have patented charge-transfer design.The second one is that it would have up to 8 independent QTouch keys supported.The third one is that it would have individual key state outputs or I2C interface.The fourth one is that it would have fully "debounced" results.The fifth one is that it would have patented AKS adjacent key suppression.The sixth one is that it would have self-calibration and auto drift compensation.The seventh one is that it would ave spread-spectrum bursts to reduce EMI.The eighth one is that it would have up to 5 general-purpose outputs.The ninth one is that it would have ECOPACK (RoHS compliant) package.That are all the features.
      Some absolute maximum specifications of QST108 have been concluded into several points as follow.The first is about its storage temperature range which would be from -65 to +150°C.The second one is about its maximum junction temperature which would be 150°C.The third one is about its supply voltage which would be 7.0V.The fourth one is about its input voltage on any pin which would be from Vss-0.3 to Vdd+0.3 V.The fifth one is about its total current into Vdd power lines (source) which would be 75 mA.The sixth one is about its total current out of Vss ground lines (sink) which would be 150mA.The seventh one is about its output current sunk by RESET pin which would be 20mA.The eighth one is about its output current sunk by output pin which would be 40mA.The ninth one is about its output current source by output pin which would be -25mA.The next one is about its injected current on RESET pin which would be ± 5mA.The next one is about its injected current output pin which would be ± 5mA.The next one is about its total injected current (sum of all I/O and control pins) which would be ± 20mA.
      Notes about QST108. All power (VDD) and ground (VSS) lines must always be connected to the external supply.And Iinj(pin) must never be exceeded. This is implicitly ensured if VIN maximum is respected. If VIN maximum cannot be respected, the injection current must be limited externally to the IINJ(PIN) value. A positive injection is induced by VIN>VDD while a negative injection is induced by VIN<VSS. For true open-drain pads, there is no positive injection current, and the corresponding VIN maximum must always be respected.And also when several inputs are submitted to a current injection, the maximum IINJ(PIN) is the absolute sum of the positive and negative injected currents (instantaneous values). These results are based on characterisation with IINJ(PIN) maximum current injection on four KOUT pins of the device.