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Microcontroller supports playback function

04 Sep 2014

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LAPIS Semiconductor has unveiled a low power microcontroller that makes audio playback possible by simply connecting to a speaker.

The ML610Q304 provides hardware-based audio playback operation that minimises the load placed on the MCU for system control processing, and the newly designed high-efficiency Class D amp reduces current consumption during audio playback by approximately 40 per cent while maintaining volume levels.

The device integrates an 8bit low power MCU core, speech synthesis circuit, high-efficiency Class D speaker amp, 96kB Flash and 1kB RAM, and oscillator circuit on a single chip.

Other features of the controller include:

  • Hardware-based voice playback function simplifies design

    Voice playback operation is performed using hardware, which significantly lightens the load on the MCU for system control processing and simplifies playback considerably.

  • Monolithic design with integrated microcontroller and audio playback function reduces the number of parts required and contributes to device miniaturisation

    All functions required for audio playback are incorporated into a single chip, including a low-power MCU, speech synthesis circuit, high efficiency Class D speaker amp, non-volatile memory, and high accuracy oscillator.

  • Multiple fail-safe functions provide superior reliability

    The device detects disconnection between the microcontroller and speakers by monitoring for changes in resistance value between the speaker terminals and can alert users in advance by lighting up LEDs; detects short-circuits by monitoring the voltage level of the speaker terminals and shuts down operation to prevent possible damage; and prevents the sound generator circuit (PWM circuit) from staying fixed at the H level for over a specified amount of time in order to prevent excessive heat generation due to over-current.

A complete support system is offered, including a reference board (ML610Q304) and software development environment that facilitate evaluation, as well as tools and manuals which can be downloaded from our website.

ML610Q304

ML610Q304 block diagram. Source: LAPIS Semiconductor




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