Family of industry-leading capacitive sensor controllers

MILPITAS, Calif., March 22, 2022 (GLOBE NEWSWIRE) — LUMISSIL MICROSYSTEMS, a division of ISSI, today announced a new addition to the family of capacitive touch-sensing controllers, consisting of the IS31SE5120 touch sensor and IS31CS8977 MCU, replacing mechanical Controllers simplify buttons in a variety of applications such as home appliances, IoT devices, instruments, control panels, and liquid level gauges. This allows for easy prototyping and rapid implementation into any product. The downloadable software package is part of an integrated development environment (IDE) that comes complete with standard code and a calibration GUI.

“The addition of the new products to the Lumissil portfolio opens up many opportunities in the automotive, home appliance and small appliance sectors that may require greater sensor counts and high-performance non-contact sensing,” said Ven Shan, VP of Marketing at Lumissil Microsystems. “With the rapid adoption of non-contact, proximity and gesture recognition, this expanded family of devices offers customers a broader range of cost-effective and easy-to-use solutions for their applications.”

The IS31CS8977 MCU comes with IDE, code libraries for free SDCC compiler or for a Keil compiler. It allows full and flexible use of part features for any type of capacitive sensing. The IS31SE5120 Cap Touch Sensor is supplied as a quick to implement turnkey product with a standard code. They are applicable to a variety of cap-touch sensor interfaces (button, wheel, slider, and proximity) and materials (glass, plastic, wood, etc.).

The IS31SE5120’s sensor calibration GUI enables easy, one-pass device configuration to calibrate capacitive touch sensors, configure GPIO ports, and save the configuration directly to a file or flash of the target device without the need for programming. A GPIO can also be configured to output a melody using an on-chip melody/tone generator. Product debugging support is available from ISSI application engineers.

Key Features and Benefits

  • Up to 24 sigma-delta capacitive touch sensors – counting up to 24-bit precision
  • Liquid Tolerance Shield driver
  • GUI sensor calibration and autocalibration
  • Multi-press and press and hold
  • 5μA quiescent current with wake-on-touch
  • fast I²C interface to the host controller
  • Melody/sound output options
IS31CS8977 – Additional functions
  • 64KB ECC Flash / 2KB ECC RAM
  • Up to 28 configurable GPIOs; Up to 27 cap touch sensors; Up to 6 interrupts
  • Active proximity detection; Mutual meaning matrix
  • 2* i2CM/S ; 1 * SPI; 1*EUART1 & 1*LIN-enabled EUART2
  • 12-bit ADC; 8-bit DAC
  • Free IDE with SDCC compiler and EzISP integration

packaging and availability

IS31CS8977 is available in 20/24/28-pin TSSOP-20/24/28 packages and 32-pin LQFP-32 packages. IS31SE5120 is available in 32-pin QFN-32 package. They operate from 2.3V to 5.5V over a temperature range of -40°C to +85°C. Samples can be ordered through Lumissil Microsystems’ global sales team and worldwide channel partners.

The IS31CS8977-QFLS2-TR is available in quantities of 10,000 and up, priced at $0.60.
The IS31SE5120-QFLS3-TR is priced at $0.65 in quantities of 10,000 and more.

Contact local distributor for pricing of other package options.

Automotive AEC-Q100 qualified options will be released later this year

About Lumissil Microsystems

Lumissil Microsystems is the analog/mixed-signal products division of ISSI, a fabless semiconductor company that designs and markets high-performance integrated circuits for the following key markets: (i) automotive, (ii) communications, (iii) industrial/medical, and (iv) digital consumer. Lumissil Microsystems’ main products are LED drivers for low to medium power RGB color mixing and high power lighting applications. Other products include audio, sensors, high-speed wired communications, optical network ICs, and application-specific microcontrollers. Headquartered in Silicon Valley, ISSI/Lumissil Microsystems has global offices in Taiwan, Japan, Singapore, Mainland China, Europe, Hong Kong, India and Korea. Visit our website at

About Integrated Silicon Solution, Inc. (ISSI)

ISSI is a fabless semiconductor company that designs, develops and markets high-performance SRAM, DRAM, Flash memory (including NOR Flash, NAND Flash and Managed NAND (eMMC) solutions) and analog/mixed-signal integrated circuits . ISSI provides high quality semiconductor products and is a committed long-term supplier to its customers. Headquartered in Silicon Valley, ISSI has global offices in Taiwan, Japan, Singapore, Mainland China, Europe, Hong Kong, India and Korea. Visit our website at

A photo accompanying this announcement is available at

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