No sound, no action: Epson microcontroller especially for audio applications at Rutronik

01/28/2021 Know-How

There is something on the ears: The Epson S1C31D51, an Arm® Cortex®-M0+ microcontroller (MCU) with specially designed hardware, can reproduce sound through either a speaker or a buzzer. This makes the MCU particularly suitable for applications with voice and audio output, such as smart home/home electronics, industrial equipment, health and fitness equipment or control and alarm systems. The microcontroller is available at


In the S1C31D51 single chip microcontroller, an additional hardware processor ensures that voice output and audio playback work simultaneously via two separate channels. Audio output like e.g. signal sounds can also be realized via a buzzer. In order to optimize the output quality sustainably, Epson relies on a specially developed combination of software and hardware. 

Thanks to the HW processor, no CPU resources are required, so that 

these are also available for other tasks without restriction during the playback processes. In addition, security functions, such as the self-check for faulty data in the integrated RAM and flash memory or in the peripheral QSPI flash memory, perform without any loss of CPU performance. 

Epson‘s own codec format EOV (Epson Own Voice) compresses voice and audio data at a sampling rate of 15,635 kHz and 16kbps to such an extent that the memory has significantly more capacity for audio data. The associated development software ESPER2 Voice Data Creation PC Tool enables the uncomplicated and fast generation of voice and audio data in up to twelve languages. Cost- and time-intensive studio recordings are thus obsolete, and the integration of already existing WAV files is possible without any problems, too.

For more information about Epson‘s new microcontroller and a direct ordering option, please visit our e-commerce platform at

Contact Person:

David Werthwein, Product Manager Digital 

 +49 7231 801 4453 |