TouchPad 4 Click Board™

Product Code: MIKROE-4752

How Does the TouchPad 4 Click Board™ Work? The Touchpad 4 Click Board™ as its foundation uses the IQS7211A, a tiny trackpad controller designed for multitouch applications using a projected capacitance touch panel from Azoteq. The IQS7211A is part of Azoteq's latest range of ProxFusion combination sensors, a multi-sensor technology that offers combinations of capacitive sensing, Hall-effect, inductive, and temperature sensing on a single integrated circuit. It allows users to control a trackpad of up to 32-channels and offers high resolution and fast response, low power consumption, and long-term activation supported by environmental tracking. It is also characterised by embedded gesture engine recognition for simple gestures (tap, swipes, hold) and built-in noise detection and filtering. ​ On the Touchpad 4 Click front side, a clearly defined field represents a touchpad area. This area is a matrix of conductive electrodes on the PCB, electrically isolated from each other, arranged as rows and columns of X and Y.

An electrode consists of multiple diamond-shaped elements, each connected to the next with a conductive neck. The controller uses the projected capacitance charge transfer principle on the touchpad area. When a conductive object such as a human finger approaches the sense plate, it will decrease the detected capacitance. Observing the measured results at various sensing points on the touchpad area enables the controller to determine proximity/hover and contact (touch) detection on all channels and accurately determine the coordinates on the touch area. The Touchpad 4 Click Board™ communicates with MCU using a standard I2C 2-Wire interface, with a clock frequency up to 1MHz in the Fast Mode. An additional ready signal, routed on the INT pin of the mikroBUS™ socket, is added, which indicates when the communication window is available. Thus, it is optimal for the response rate to use the INT pin as a communication trigger. Alongside this pin, this Click board™ has a Reset feature routed to the RST pin on the mikroBUS™ socket, which with a low logic level puts the module into a Reset state, and with a high level operates module normally. The Touchpad 4 Click Board™ can be operated only with a 3.3V logic voltage level. The board must perform appropriate logic voltage level conversion before use with MCUs with different logic levels. However, the Click board™ comes equipped with a library containing functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type Capacitive Applications Can be used for human-machine interfaces, keypad or scrolling functions, single-finger gesture-based interfaces, and more On-board modules IQS7211A - tiny trackpad controller designed for multitouch applications using a projected capacitance touch panel from Azoteq Key Features Low power consumption, high resolution, fast response, long-term activation supported by environmental tracking, embedded gesture engine recognition for simple gestures (tap, swipes, hold), and more Interface I2C Compatibility mikroBUS Click board size L (57.15 x 25.4 mm) Input Voltage 3.3V PINOUT DIAGRAM This table shows how the pinout of the Touchpad 4 Click Board™ corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin ​ Pin Notes NC 1 AN PWM 16 NC Reset RST 2 RST INT 15 INT Interrupt NC 3 CS RX 14 NC NC 4 SCK TX 13 NC NC 5 MISO SCL 12 SCL I2C Clock NC 6 MOSI SDA 11 SDA I2C Data Power Supply 3.3V 7 3.3V 5V 10 NC Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description LD1 PWR