Epson Launches Power-efficient 32-bit Microcontroller with an Arm®Cortex®-M0+ Processor

Single-chip S1C31W73 MCU has 384 kB of memory and high-resolution LCD driver

Munich, May 27 2020 – Seiko Epson Corporation (TSE: 6724, “Epson”) will add a new microcontroller unit (MCU) to the company’s S1C31W series of MCUs. The S1C31W73 has an Arm® Cortex®-M0+ processor and on-chip Flash memory. Epson plans to produce 200,000 units per month when volume production begins in July 2020. 

The number of functions provided in electronic equipment has been growing in recent years, and program sizes are increasing, as the amount of information is displayed. Meanwhile, equipment manufacturers need either maintain or further shrink the size of their products, making it essential to reduce the number of parts and save board space.

To solve these problems, Epson developed the S1C31W73, a single-chip microcontroller that has 384 kB  of built-in Flash memory and a liquid crystal driver that can directly drive a display of up to 2,560 dots. By combining Epson’s strong microcontroller display driver technology with the proven Arm® Cortex®-M0+ processor, Epson will help customers to increase the functionality and performance of their products while also reducing their development burden.

The S1C31W73 offer a wide range of built-in peripherals, including a USB 2.0 full-speed device controller, real-time clock (RTC), various timers, an A/D converter, and a temperature sensor. The low current consumption of this MCU—1.2 μA in RTC mode and a driving current of 150 μA/MHz—makes it ideal for extending the battery life of wearable products and for office equipment that can communicate with PCs over USB. The S1C31W73 can also be used in industrial equipment and measuring instruments because it operates at temperatures up to 105ºC (the highest operating temperature yet for an Epson MCU) and at voltages between 1.8 V and 5.5 V.

Epson is committed helping its customers to improve the performance of their products with solutions that leverage Epson’s efficient, compact, and precision technologies.

Key Product features

A large number of built-in peripherals that simultaneously help customers add more functions to their products while reducing the number of parts

  • High-capacity Flash memory
  • High-resolution dot-matrix LCD driver with built-in power supply
  • USB 2.0 full-speed device controller
  • Real-time clock
  • Supply voltage detector (SVD) circuit that does not require an external power supply supervisor
  • A/D converter, temperature sensor / reference voltage generator circuit
  • Universal port multiplexer (UPMUX): I/O pin assignments changed with software

Usable under a wide range of environmental conditions

  • Operating voltage range: 1.8 V – 5.5 V
  • Operating temperature range: -40°C to 105°C
  • High-speed operation up to 33 MHz, and 2 μs (max.) quick-start
  • Low-power 32.768 kHz crystal oscillator / 32 kHz built-in oscillation circuit
  • Shipment in a QFP or as a bare die

Product specifications

Product number S1C31W73
CPU core Arm® Cortex®-M0+ 32-bit RISC processor
Flash memory 384 Kbytes
RAM 32 Kbytes
Operating voltage 1.8 V to 5.5 V
Operating frequency Max. 33 MHz (VD1 voltage mode: mode 0)
Max. 2.1 MHz (VD1 voltage mode: mode 1)
LCD driver Max. 2,560 dots (80 SEG x 25-32 COM)
Max. 2,112 dots (88 SEG x 17-24 COM)
Max. 1,536 dots (96 SEG x 1-16 COM)
Serial interfaces UART & SPI: 2 channels each
I2C & QSPI: 1 channel each
USB 2.0 full-speed device controller, 1 ch
A/D converter 12-bit successive-approximation ADC
External signal inputs: 7 max.
Internal signal inputs: 1   Connect temperature sensor output
Temperature sensor / reference voltage generator circuit Sensor output can be read by the A/D converter
Reference voltage for A/D converter is selectable from 2.0 V, 2.5 V, VDD, and external input
Supply voltage detector 32 levels (1.7 V to 5.0 V)
Timers 16-bit timer: 8 channels     16-bit PWM timer: 2 channels
Watchdog timer
Real-time clock
I/O ports Max. 73 bits
Universal port multiplexer: 32 bits
Current consumption (typical)
Sleep mode: 0.7 μA 
RTC mode: 1.2 μA 
RUN mode: 220 μA/MHz (VD1 voltage mode: mode 0)
                    150 μA/MHz (VD1 voltage mode: mode 1)
LCD driver: 10.6 μA (checker pattern)
3.0 μA (all on)
Shipping form Bare die with an 80 µm (min.) pad pitch 
P-LQFP216-2424-0.40 (pin pitch: 0.4mm)

Arm and Cortex are registered trademarks of Arm Limited (or its subsidiaries) in the US and other countries. All rights reserved.

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