For capacitive touch key applications, both QST and S-Touch families of products offer the following benefits:
full digital architecture and smart functions
extremely tolerant to environmental changes
advanced automatic calibration Adjacent “touched key” determination mechanism
low external component – small footprint
low power consumption
reliable technologies
operating voltage: 1.8 - 5.5 V
The QST family of products uses a pure digital, firmware-based solution that implements Quantum's patented and field-proven charge-transfer QProx™ capacitive technology. Key features are:
QTouch™ technology for simple touch panels of up to 12 keys
QMatrix™ technology for high key counts in small packages
support for any combination of buttons, wheels and sliders
advanced processing techniques such as drift compensation, auto-calibration, and noise filtering
adjacent key suppression (AKS™) to ensure maximum useability
and control integrity
multifunction capabilities for contemporary user interfaces
S-Touch's finite state machine (FSM) architecture uses a dedicated and complete IC approach with its own distinctive features for a fast time-to-market solution.
robust and sensitive capacitance detection engine based on differential capacitance measurement
design flexibility using configurable automatic impedance calibration, adjustable touch variance and environmental variance for optimized calibration
direct user access to program the instruction sets and parameter settings
very fast IC sampling time (typically 2 ms) ensured by an optimized FSM architecture
innovative processing techniques to enhance user control:
- advanced data filtering (AFS)
- environmental tracking calibration (ETC)
touch sensor solution with very low power consumption (typically 5 µA per key)
ultra small packages for low key devices (QFN16 - 2.6 x 1.8 mm for 8 channels)
