SwipeSwitch Click is capacitive touch, gesture, and proximity sensing Click board™, which is equipped with the IQS266, an integrated trackpad controller circuit which features ProxSense® and IQ Switch® technologies. This IC consists of a 2x3-channel capacitive trackpad controller, and a single self-capacitive proximity sensor, which can be used to wake up the device. This ensures very low power consumption, as the device is able to stay in the Sleep mode when not used. The IQS266 can detect a number of various configurable swipe and tap gestures. An Automatic Tuning Implementation (ATI) feature ensures an optimized performance in various conditions.
SwipeSwitch Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.
Built upon years of experience, featuring well-proven touch sensing technologies, the IQS266 is a perfect solution for single-sided capacitive trackpads for various applications. Combined with the low power consumption, a low number of external components required, and a set of advanced options and features, SwipeSwitch Click presents an ideal platform for the development of low-power touch sensing applications for wearables, white goods, home appliances, toys, human-machine interface (HMI) applications, etc.
SwipeSwitch Click is based on the IQS266, an integrated trackpad controller circuit, featuring ProxSense® and IQ Switch® technologies, from Azoteq. This integrated touch controller features 2 receivers and 3 transmitters, allowing a 2x3 capacitive touch trackpad to be formed. By using a specific trace pattern on the PCB, the Click board™ is able to sense several different swipe gestures, offering several different configuration parameters. By employing well-proven ProxSense® and IQ Switch® technologies, the IQS266 device is able to provide very reliable touch detection in various environmental conditions. It uses the industry-standard I2C communication interface, with the additional RDY pin for the event signaling and communication protocol handshaking routines.
Besides five capacitive touch sensing electrodes, the IQS266 integrates a single proximity channel. This channel can be used to wake up the device from the standby mode when the user approaches the touch panel, ensuring a low overall power consumption that way. CH0 is a dedicated proximity/touch channel and it is treated as a separate channel group in the IQS266 settings. Both proximity and touch thresholds can be defined for this channel.
Automatic Tuning Implementation (ATI) ensures the optimal sensitivity of the sensing channels, by monitoring the sampling values. The developer can set up the ATI targets for two groups of channels (channel 0, and channels 1-6). Once these targets are set, the ATI algorithm will try to match them, ensuring consistent behavior when used in various operating conditions. The ATI functionality can also be disabled/forced by the user, allowing to retune the sensor electrodes on demand. Else, the IQS266 will automatically retune the electrodes every time the counts drift outside a predefined ATI band in an attempt to ensure an optimal sensitivity.
The RDY pin has two functions. It can be used as an interrupt event pin, signaling either an event occurrence (when operated in the Event mode) or a "Data Ready" event. In this case, the RDY pin will be driven to a LOW logic level to signal an event, allowing it to generate an interrupt on the host MCU. However, the host MCU can pull the RDY pin down to initiate a communication window (communication protocol handshaking), requesting data from the device. The RDY pin is routed to the mikroBUS™ INT pin.
The IQS266 can be set to operate in the Streaming mode or in the Event mode. When operated in the Event mode, the RDY pin will indicate a communication window only after the selected event has occurred. There are several different events to choose from: low power, swipe, tap, ATI, trackpad, touch, and proximity event. Each event is signalized by the RDY pin driven to a LOW logic level. More details about the RDY pin driving pattern for each event can be found in the IQS266 datasheet.
The IQS266 is very flexible, allowing many parameters to be tuned according to needs. These parameters include timeout periods for various modes (Zoom mode timeout, Low Power mode timeout, RDY timeout, etc.) thresholds for various events and channels, some special sensing parameters, and so on. The developer can set up these parameters by writing appropriate values to the registers of the IQS266 IC over the I2C interface. For a more detailed description of each register, please refer to the included datasheet. However, the Click board™ is supported by a library of mikroSDK compatible functions that simplify and speed up the development. It also comes with the example application, which demonstrates their use.
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