Azoteq IQS227AS/B & IQS228AS/B Single-Channel Devices

Azoteq IQS227AS/B and IQS228AS/B Single-Channel Touch Devices feature an internal voltage regulator and reference capacitor (Cs). The devices include a dedicated pin or pins for the connection of sense electrodes (Cx) and output pins for proximity and touch events on OUT. The polarity of the output pins can be configured. A one-wire open drain data streaming protocol OR I²C interface is implemented for debugging purposes. Device configuration is determined by one-time programmable (OTP) options. Azoteq IQS227AS/B and IQS228AS/B Single-Channel Touch Devices are ideal for mobile devices, white goods and appliances, proximity-activated backlighting, automotive, and a wide range of other applications.

Features

IQS227AS/B
- Sub 2.5µA in low-power mode while sensing Proximity
- Automatic tuning implementation (ATI) – automatic tuning of sense electrode
- Internal capacitor implementation (ICI) – reference capacitor on-chip
- 1.8V to 3.6V supply voltage
- Minimum external components
- Data streaming option
- Advanced on-chip digital signal processing
- User selectable (OTP)
  - 4 power modes
  - IO sink / source
  - Time-out for stuck key
  - Output mode (direct / latch / toggle)
  - Proximity and touch-button sensitivity

IQS228AS/B
- 1 self-capacitive channel
- DYCAL™: Intelligent Hysteresis
- Proximity and touch outputs
- Automatic tuning
- Internal reference capacitor
- Minimum external components
- 1-wire data streaming
- I²C debug option
- User selectable options (OTP)
  - Low-power modes
  - Ext sync control or ext filter control
  - I/O sink or source selection
  - Time-out for stuck key
  - Proximity and touch sensitivity selections
- 1.8V to 3.6V supply voltage

Applications

IQS227AS/B
- LCD, plasma, and LED TVs
- GSM cellular telephones – on-ear detection / touch keys
- LED flashlights or headlamps
- White goods and appliances
- Office equipment, toys, sanitary wares
- Flameproof, hazardous environments
- Human interface devices
- Proximity detection enables backlighting activation
- Wake-up from standby modes
- Replacement for electromechanical switches
- Find-in-the-dark (FITD)
- Automotive
  - Door pocket lighting
  - Electric window controls

IQS228AS/B
- Proximity sensors
- SAR detection for tablets
- On-ear detection for mobile phones
- 3D glasses
- Personal media players
- White goods and appliances
- Human interface devices
- Proximity activated backlighting

Azoteq IQS227AS/B & IQS228AS/B Single-Channel Devices

Features

Applications

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