Pulse Oximeter

For Fitness and Medical Applications

A pulse oximeter is a medical device that indirectly monitors the oxygen saturation and pulse rate of a patient's blood. These portable, battery-operated pulse oximeters are popular in hospitals and clinics.

Renesas’ high integration sensor, the OB1203, is the industry’s smallest optical biosensor module, with a fully integrated biosensor for reflective photoplethysmography. With the appropriate algorithm, it can determine human heart rate, oxygen saturation (SpO2), respiration rate, and heart rate variability. The pulse oximeter transmits this data via an I2C interface to an MCU for system reporting.

Optimized for handheld applications, this design incorporates the RA2A1, an Arm®-based microcontroller. With its analog support, it can simply implement USB charging of a Li-ion battery, eliminating the need for additional components. Voltage and current can be monitored and controlled with real-time feedback, while charging mode can be adjusted as required.

System Benefits

  • The OB1203 can be used to achieve the simplest scheme of a rechargeable pulse oximeter for measuring blood oxygen and pulse rate
  • MCU-based lithium battery management, which includes pre-charging, CC, CV charging mode, overcurrent, overvoltage, and overheating protection
System Block Diagram

Pulse Oximeter

Recommended Products

Microcontroller

Product Description Featured Document Ordering
RA2A1 48MHz Arm® Cortex®-M23 core with integration of a 24-bit sigma-delta ADC Datasheet Select Specific Device

Sensor

Product Description Featured Document Ordering
OB1203 RGB/Ambient light, proximity and photoplethysmography sensor Datasheet Buy/Sample

LDO

Product Description Featured Document Ordering
ISL80510 High performance 1A LDO Datasheet Buy/Sample
ISL80505 High performance 500mA LDO Datasheet Buy/Sample
Winning Combinations

Renesas and IDT’s complementary product portfolios work together to deliver comprehensive solutions to our customers. This is just the beginning, with the combination of the Renesas and IDT development teams, there will more integrated solutions that provide significant advantages over traditional solutions.

See the benefits immediately with our “Winning Combinations” solutions