Low-power MEMS Microphone Brings High Fidelity for IoT ProductsLow-power MEMS Microphone Brings High Fidelity for IoT Products

IoT apps such as smart watches, home security, and smart speakers require sound detection at low power levels. Recently, TDK Corporation unveiled its InvenSense SmartSound T5848 I²S microphones which enable intelligent keyboard, voice command and sound detection while minimizing power draw.

In high-quality mode, the T5848 delivers a 68 dBA signal-to-noise ratio while consuming just 330 µA at 1.8V. This provides high sound fidelity to ensure accurate keyword detection even in noisy environments. The high signal-to-noise ratio ensures that AI systems receive high-quality input, even in noisy surroundings where keywords or voice commands must be distinguished from irrelevant background noise. The high-quality input improves the accuracy and reliability of response required for next-generation AI systems.  

The microphone consumes only 130 µA in always-on low power mode, prolonging the battery life of always-on systems.

In addition, the T5848 has an Acoustic Activity Detect (AAD) Feature that can be programmed to listen for acoustic activity indicating keywords or voice commands, allowing the application’s processor to efficiently manage power consumption during idle periods. This enables IoT and edge AI devices to remain in an always-on state, ready to respond to user interactions without draining the battery.

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The T5848 also supports the I²S interface, which reduces the number of components in the system to simplify design. It also reduces processing requirements such as filtering the microphone output in the system hardware or software. Potential applications include smart watches, voice-activated TV remote controls, window glass break detection, AR (augmented reality) glasses, wearables, action cameras, and smart speakers.
TDK recently demonstrated the T5848 and other microphones and the unique AAD feature at Sensors Converge 2024. You can watch the video showing the features of the sensor below.

The T5848 microphones are available now for evaluation and integration into various devices. TDK microphones have been integrated by multiple ecosystem partners, which reduces required engineering investment and time to market for edge AI systems with intelligent keyword or audio detection needs. More information can be found at https://invensense.tdk.com/products/digital/t5848/.