- TOKYO, Japan, August 26, 2020 -

Seiko Epson Corporation (TSE: 6724, "Epson") has developed a new power-efficient flash microcontroller unit (MCU) with an ARM^®Cortex^®-M0+ processor. The S1C31W65 is the latest addition to the popular S1C31W series of single-chip MCUs with an integrated liquid crystal driver. It is the first multipurpose microcontroller to support a segment liquid crystal display driver. Epson plans to produce 200,000 units per month when volume production begins in August 2020.

Industrial equipment and consumer electronics are increasingly IoT-enabled systems hosting a multitude of functions. They require high-performance processing while still maintaining low current consumption. To meet these market requirements, Epson has leveraged its low-leakage and low-current consumption technologies and used Arm^®Cortex^®-M0+ processors to expand and upgrade the S1C31 family of MCUs, which offer high performance yet consume minimal current.
The S1C31W65, operating at up to 33 MHz, delivers the highest performance in the S1C31 family. It consumes just 0.3 µA in sleep mode¹ and operates at 130 µA/MHz.² In addition, Epson leveraged its signature display driving technology to provide an LCD driver that can drive up to 416 segments. The bias power supply necessary for driving a liquid crystal panel can be generated by the internal power supply circuit³, so display quality is not affected by the remaining battery power. In addition, drive voltage is software adjusted. The MCU supports LCD contrast adjustment and liquid crystal panels with different voltages.

The S1C31W65 has a host of peripheral circuits, including various timers, a real-time clock (RTC), R/F converter⁴, A/D converter, and a temperature sensor. It supports operating temperatures up to 105℃ and operating voltages ranging between 1.8 V and 5.5 V, making it ideal for industrial equipment and for consumer electronics that require sensing.
Epson is committed to helping its customers improve the performance of their products with solutions that leverage Epson's efficient, compact, and precision technologies.

1. A large number of built-in circuits that simultaneously help customers add more functions to their products while reducing the number of parts
   • Self-programmable flash memory
   • Liquid crystal driver with integrated power supply circuit
   • Real-time clock
   • Supply voltage detector (SVD) circuit that does not require an external power supply supervisor
   • R/F converter, A/D converter, temperature sensor / reference voltage generator circuit
   • Universal port multiplexer (UPMUX): I/O pin assignments changed with software
2. Usable under a wide range of environmental conditions
   • Operating voltage range: 1.8 V to 5.5 V
   • Operating temperature range: -40℃ to 105℃
   • High-speed operation up to 33 MHz
   • Boot clock startup as fast as 2 µs⁵
   • Low-power 32.768 kHz crystal oscillator / 32 kHz built-in oscillation circuit

Please see the link below for further details about these products.
https://global.epson.com/products_and_drivers/semicon/products/micro_controller/armcore/

Check the following website to see the demonstration video.
https://youtu.be/LA0NkjRpIHs

¹ Equivalent to the Cortex^®-M0+ processor's deep sleep mode

² When V_D1 voltage mode is mode 1

³ The external input mode of the bias power supply is also supported.

⁴ RC oscillation type A/D converter. Resistance components are converted to frequency. Low-error, high-accuracy measurement is achieved by oscillating a reference resistance and sensor under identical conditions and finding the difference.

⁵ The time it takes for the CPU to read the vector table from the sleep state with a 32-MHz system clock

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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