Azoteq IQS228D00000000DNR

The IQS228D is a single-channel capacitive proximity and touch device featuring an internal voltage regulator and reference capacitor (CS). The device has a dedicated pin for connecting the sensing electrode (Cx) and an output pin for signaling proximity and touch events on OUT, with configurable output polarity. For debugging purposes, a 1-wire open-drain data streaming protocol or I²C interface is implemented. Special device configuration can be achieved by setting one-time programmable (OTP) options. The device automatically tracks slowly changing environmental variations through various signal processing algorithms and features an Automatic Tuning Implementation (ATI) algorithm to calibrate the device to the sensing electrode. DYCAL™ (Dynamic Calibration) is a special form of hysteresis that tracks slowly changing environmental variations even when the sensor is in a touch state, making it ideal for portable applications. The IQS228D uses the charge transfer method of capacitive sensing (the charge transfer principle is described in detail in Application Note: AZD004 - Azoteq Capacitive Sensing). The device is designed for applications requiring proximity sensing where a touch state may persist for extended periods — a condition that can cause uncompensatable drift in conventional capacitive sensors. Proximity is detected using a low threshold, while touch detection uses a higher threshold. When a touch state is detected for a duration exceeding tDVCAL, dynamic calibration is performed. The hysteresis algorithm will check the touch release condition while tracking environmental changes. Unless otherwise specified, all specifications provided in this datasheet apply over the following ranges: Temperature: -40°C to 85°C for IQS228D; Supply voltage (VDDH): 2.4 V to 5 V. The IQS228D is available in a DFN-6 package.

• Single self-capacitance channel
• DYCAL™: intelligent hysteresis
• Proximity and touch outputs
• Auto-tuning
• Internal reference capacitance
• Minimal external components
• 1-wire data stream
• I²C debug option
• User-selectable options (OTP)
• I/O sink or source current selection
• Key stuck timeout function
• Proximity and touch sensitivity selection
• Low-power mode - 3.2 μA
• Supply voltage: 2.4 V to 5 V
• RoHS2 compliant
• 6-pin DFN-6 package

• Proximity sensor
• Mobile phone ear detection
• Personal media player
• Human interface device
• Tablet SAR detection
• 3D glasses
• White goods and appliances
• Proximity-sensing backlight