IQS229EV01 Azoteq

ProxSense Series IQS229EV01 module user guide Single Channel Capacitive Proximity/Touch Controller for SAR Applications Operation Characteristics Integration The IQS229 will work in standalone mode Start the integration of the IQS229 by wiring (STD LED outputs) or streaming mode the following into the intended application: (STRM), depending on a resistor placement. 1. GND By default the module will be configured in 2. CX (Electrode wire or copper pad) standalone mode. 3. VDDHI OUT (BLUE) LED will indicate an On-board LEDs may be used for feedback, or activation (crossing of the threshold) the OUT and MOV OUT pins may be taken MOV OUT (GREEN) LED will indicate to a microcontroller. movement in small detectable amounts. MOV OUT TIM GND OUT CX (Electrode) T0 VDDHI (1.8 - 3.3V) MT NC T1 User Configurable Options Threshold Level Selection Four pins on the IQS229 are used for external configuration. Floating pins are the L = LOGIC LOW, H = LOGIC HIGH,F = FLOAT default configuration. The configuration is read at power-on or reset. To see how T0, THR0 (pin 8) resistor straps are applied, see the next page. L L L F F F H H H Start off by choosing a threshold. T0 is used to set a large jump in threshold and T1 is T1, THR1 (pin 6) used to set smaller offsets. Next choose the preferred movement L F H L F H L F H sensitivity by strapping MT. Corresponding Threshold Level Then choose a no movement time-out. If no movement is detected in this time, the sensor 0 1 2 3 4 5 6 7 8 will clear the activation. With each movement the IQS229 will reset the timer. More sensitive Less sensitive Copyright Azoteq 2013 IQS229EV01 module user guide v1.2 For more information visit www.azoteq.com ProxSense Series Using resistor strap options Threshold Adjustment Resistor straps are used to configure the device as shown below. It is recommended to use a 1M resistor for this purpose. After power-up or reset the values will be read and each pin is written with the values that Less sensitive T0: was read. This eliminates potential leakage current. Large steps TIM: Timer Adjustment More sensitive T1: Small Shorter timer steps Less sensitive Longer timer More sensitive MT: Movement TIM (pin 1) No Movement sensitivity adjustment Time-out Low 60sec Float 3min High 10min More sensitive Less Sensitive OT/OUT Function MT Movement Threshold MOV THR (pin 7) Low More sensitive Float Default Standalone (default) 1-Wire Streaming 1Meg pull-down (debugging) 4.7k High Less sensitive Copyright Azoteq 2013 IQS229EV01 module user guide v1.2 For more information visit www.azoteq.com