Epson – S1C31W74 32-bit MCU with ARM® Cortex® M0+ Core and Built-in LCD Driver

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Epson’s low-power MCU family with rich peripherals offers ideal solutions for display in consumer and industrial applications

The S1C31W74 MCU is a 32-bit MCU with embedded ARM® Cortex® M0+ core and features low-power operation. S1C31W74 also features a rich set of peripherals, serial interfaces and embedded LCD drivers that makes it an ideal choice for implementing display solutions in battery-operated and power sensitive applications such as wearables, fitness gadgets, home/building and industrial automation applications.

The S1C31W74 features 512KB of embedded Flash memory, 128KB of SRAM, and supports a maximum clock speed operation of 22MHz. The MCU supports multiple clocking modes including RTC for performance and wide functionality. The S1C31W74 features 24-bit resistance-to-frequency converter (RFC) as well as serial interfaces including Quad-SPI (QSPI), USB 2.0 controller, 2-channels of UART 2 channels of I2C, SPI. The embedded LCD Driver supports 80 SEG x 24 COM and 72 SEG x 32 COM LCD output along with 16-levels of LCD contrast to interface with a suitable external LCD display. In addition, the MCU also features DMA controllers, ample number of GPIOs, watchdog timers and 16-bit PWM timers and sound generator to support other auxiliary system functions.

The operating voltage for S1C31W74 is 1.8V to 3.6V and with an operating temperature range of -40°C to +85°C. S1C31W74 is in production now with samples and evaluation kit available from major distributors.



  • Embedded 32-bit ARM® Cortex® M0+
  • Embedded 512KB Flash and 128KB RAM
  • Max clock speed 22MHz
  • Built-in LCD driver for 80 x 24, 72 x 32
  • 24-bit resistance/frequency converter
  • USB 2.0 device controller
  • 32-level supply voltage detector
  • Quad-SPI 1ch, SPI 1ch, I2C 2ch, UART 2ch
  • 72 GPIOs
  • Sound generator
  • Memory display controller (software)
APPLICATIONS Ideal for display solutions in:

  • Wearables and fitness equipment
  • Home appliances
  • Factory automation
  • Industrial equipment
  • Consumer medical devices