VM3011

Adaptive ZEROPOWER Listening™ Digital Piezoelectric MEMS Microphone

 

VM3011 is the world’s first Adaptive ZEROPOWER Listening™ Digital Piezoelectric MEMS Microphone

The VM3011 with Adaptive ZEROPOWER Listening™ technology automatically adjusts the acoustic threshold based on the background level of the environment. When combined with ultra-fast startup of piezo microphones the VM3011 enables un precedent system power saving for battery life of voice operated devices without compromising the acoustic performance.

The VM3011 delivers high acoustic performances through a bottom port digital MEMS microphone with an industry standard package size of 3.76 x 2.95 x 1.3 mm. The microphone integrates both the ASIC and the piezoelectric MEMS transducer in the same package. A digital PDM interface is available to stream the audio data while an I2C interface allows “on the fly” configuration of the Adaptive ZPL. Any Vesper piezoelectric MEMS device, including the VM3011, is natively IP57 rated to maintain functionality and performance in harsh environments.

Operation

VM3011 uses the PDM clock speed to change device modes. The DATA pin outputs PDM output in normal mode operation.

In Wake on Sound mode, DOUT outputs a single bit “Threshold Exceeded” Flag when the acoustic input is greater than the set threshold. The microphone is constantly listening to the environment with just 10 μA of current consumption. Adaptive Mode is continuously measuring the average sound level of the environment and adjusts the internal WoS Threshold comparator until it converges to the threshold margin configured using I2C register. This margin can be set to a range 6-18 dB above the average acoustic noise level. When the required threshold is reached, the microphone sends an interrupt signal to the external codec or voice processor using a Digital Output pin (DOUT).

Application Circuit

VM3011 uses the clock speed to change device modes.

The DATA pin outputs PDM output in normal mode operation. In ZPL mode, DOUT outputs a single bit “Threshold Exceeded” Flag when the acoustic input is greater than the set threshold.

Multi-mode Microphone

VM3011 supports multiple modes of operation that are selectable using different PDM clock speeds.

The ZPL mode for acoustic activity detect requires the clock to be turned off. The threshold for the ZPL trigger can be dynamically changed using I2C transactions.

Extended Battery Life

The 1st generation ZPL (available with VM1010) is already endorsed by industry leading products such as far-field voice remotes and security cameras for extended battery life. Adaptive ZPL (2nd generation of ZPL) will further extend the ability of the battery-operated smart home device to run for months on a single charge.

Environmental Robustness

VM3011 has an IP57 rating for operation in
environmentally robust applications.

The mic does not require a protective mesh offering a reduction in BOM costs while preserving the acoustic performance metrics such as sensitivity and SNR at the system level. Data from our extensive testing of the IPx7 water immersion and the IP5x dust immunity highlights the robustness of the piezoelectric technology.

Target Application

  • Voice activated TV Remote controls
  • Smart Security Cameras
  • Glass break / Smoke alarm detectors
  • Smart Watches and other wearables
  • Smart Home applications

Technical Specifications

VM3011 is an adaptive ZEROPOWER Listening™ Digital Piezoelectric MEMS Microphone

Features

  • Adaptive ZEROPOWER Listening TM Technology
    • ZPL Configurable through I2C
    • Sound Engine tracks the ambient SPL
  • Interfaces
    • Digital Output, Pulse Density Modulation
    • Standard I2C to configure the ZPL
  • 3 Different Power Profiles (Clock Speed Selectable)
    • No Clock = ZPL Mode, 10uA
    • <1MHz = Low Power, 400uA
    • 1MHz = Normal Power, 700uA
  • Dust and Moisture Resistant
    • IP57
  • Ultra-fast startup in all power profile
    • Lower than 200 μS
  • RFI and EMI robust
  • Compliant with AVS requirement

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