BelaSigna® R281 is an ultra-low-power voice trigger solution for a wide range of consumer electronic devices. In a typical application, BelaSigna R281 is "always listening" and will detect a single, user-trained trigger phrase, asserting a wake-up signal when this trigger phrase is detected.

"Always-on" key phrase detection with an average power consumption of less than 300 uW (not including the power consumption of the microphone) preserves Standby battery life.

BelaSigna R281 is an ultra-miniature solution that is available in both a 5 mm x 5mm QFN32 package and a 2.42 mm x 2.74 mm WLCSP package. It can be designed onto a single layer PCB with 4 mil routing and with a minimal amount of external components.

An external, I
C host controller is required to configure the device for operation.

• Ultra-Low-Power

• Superior Performance

• Mixed-Signal

• Easy Design-In

Key Features 

Proven Ultra−Low−Power Digital Signal Processing (DSP) Technology 

• Audio DSP Technology Originally Developed for Hearing Aids Offers the Required Computational Power at Extremely Low Current Consumption 

• < 300 W Average Current Consumption (not including microphone) Mixed−Signal System−on−Chip (SoC) 

• Audio−grade, Analog Input with Onboard Pre−amplifier 

• Built−in, Regulated Voltages Including Onboard Microphone Bias for Power Efficient Operation 

• Supports Analog or Digital Microphone Input Interfaces and Peripherals 

• I2C−based Device Configuration and Control

 • GPIO Wake Signal 

• Internal Oscillator Applications 

• Mobile Phones

 • Tablets 

• Portable Electronic Devices

 • Wearables • Toys