Continuous Positive Airway Pressure (CPAP) is a non-invasive therapy treatment for sleep apnea. It delivers constant airflow to people while they sleep. CPAP is often referred to as “the gold standard” treatment option and is the most commonly prescribed.

What is sleep apnea? Sleep apnea is a sleep disorder condition where you stop breathing characterized my pauses in breathing during sleep. Each episode can pause and last for a few seconds to a few minutes and such episodes can occur repeatedly throughout sleep. People with sleep apnea will experience sleepiness or feel tired during the day, impaired alertness and vision problems.

3 Types of Sleep Apnea

  • Obstructive Sleep Apnea (OSA)
  • Central Sleep Apnea (CSA)
  • Mixed (combination of both OSA and CSA)

Obstructive Sleep Apnea (OSA)is the most common type of Sleep Apnea. Air stops flowing into the lung because of a blockage or obstruction in the upper airway (i.e. the nose or throat). This results in snoring, restless sleep and sleepiness during the day. The elderly and men are likely to have OSA compared to young people, woman and children. CPAP is the most common used therapy treatment for OSA.

Central Sleep Apnea (CSA) is less common type of sleep apnea. This is basically caused by no communication between the brain and the body, resulting in no effort in breathing and air stop flowing to the lung. People with CSA usually do not snore and therefore it is very difficult to diagnose the condition.

A Mixed Type sleep apnea condition is the most complicated type. It is a combination of both OSA and CSA where there is blockage in the upper airway and the brain cannot process well to continue breathing. The condition is generally detected when obstructive sleep apnea is treated with CPAP and central sleep apnea emerges. The exact mechanism of the loss of central respiratory drive during sleep in OSA is unknown but is most likely related to incorrect settings of the CPAP treatment and other medical conditions the person has.

The Renesas CPAP Demo Kit is a proof of concept demo that was developed to enable customers to reduce the time to market. It demonstrates the ease of implementation using the Renesas Synergy S7 microcontroller (MCU) with the Synergy Software Package (SSP).

The kit contains four fully functional modules: High-speed CPAP motor control, secure data storage, graphic control display, and secure connectivity to the cloud.

Renesas CPAP Demonstration Kit Functional Modules

CPAP Motor

CPAP Motor

  • Sensorless vector control for BLDC motors
  • <16% CPU resources usage while running at 33KRPM
  • High-speed acceleration and deceleration
    From 5KRPM to 33KRPM in 0.15µs
Cloud Connectivity

Cloud Connectivity

  • Cloud connectivity via GPRS/3G
  • AES encryption
  • Secure cloud access
  • Demonstrate HTTPS (TLS) access (HIPAA compliance)
  • Highly secure key storage
CPAP Data Storage

Data Storage

  • SD Card secure storage
  • File system (FAT)
  • AES encryption
  • No
  • Ext SDHI controller required


  • Eliminating Ext graphic LCD controller
  • 2D graphic engine built-in
  • GUIX makes graphic design easy for development
  • High capacity built-in SRAM (640KB) eliminates Ext RAM;
    2 buffers possible with QVGA resolution

The CPAP motor control functional module demonstrate the controlling of the airway pressure. The motor can accelerate and decelerate to high speeds from 5,000rpm to 33,000rpm in just 0.15us, utilizing only 16% CPU resources.

The Renesas Synergy S7 has a build-in LCD Controller that allow easy implementation of HMI using GUIX S/W. The MCU also come with a 2D graphic Engine and JPEC decoder with high capacity SRAM (640KB) that allow changing of graphic design and resolution easily without external memory.
The Cloud connectivity functional module demonstrate cloud access via GPRS/3G module. HTTPS access is also being demonstrated using advance security encryption engine and TLS. Data is being securely encrypted and store in the SD storage. These are made possible within days of implementation using Renesas Synergy™ platform.

CPAP Motor Control Module

CPAP Motor Control Module


Nextan - CPAP Partner

Renesas partnered with Nextan to implement the CPAP. Headquartered in Singapore, Nextan was founded in 2003 with a strong focus on R&D to pursue new areas of technology innovation in the transport, healthcare and surveillance industry.


CPAP Demo Kit Highlights

  • Powered by the Renesas Synergy™ Platform – Synergy S7 inside
  • High-speed CPAP motor control in fast acceleration and deceleration
  • Easy communication setup/data transfer via GPRS/3G
  • Secure cloud access to HTTPS (TLS) access (HIPAA compliance)
  • Secure data storage via SDHI
  • LCDC embedded with 2D engine and JPEG codec

Documentation & Downloads

Title Other Languages Type Format File Size Date
Continuous Positive Airway Pressure Demo Kit Brochure PDF 966 KB