Find the perfect block diagram with our step-by-step guide below. Start by choosing a solution,
then refine your selection as the next fields adapt dynamically to lead you to the final diagram.
Expanded View
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Monitor","path":"/design/interactive-block-diagrams/medical/continuous-glucose-monitor","children":[]},{"id":"f6130e35-4fd0-4719-acac-e3da45c1a9a6_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Hearing Aid","path":"/design/interactive-block-diagrams/medical/hearing-aid","children":[]},{"id":"a3e4f792-c0dc-4153-bb76-59bbe623ed64_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Patient Monitor","path":"/design/interactive-block-diagrams/medical/patient-monitor","children":[]},{"id":"fa0c8829-c8b8-426a-8624-fb6406550d0b_IBD_DIAGRAM","parentId":"232a1fe1-c60b-4a4f-853e-7b73a7209c91_IBD_SUBSOLUTION","text":"Ultrasound Transducer","path":"/design/interactive-block-diagrams/medical/ultrasound-transducer","children":[]}]},{"id":"d17e7410-a519-48f1-887a-1644e3a10c78_IBD_SUBSOLUTION","parentId":"9d330931-7485-49dd-ae21-990ea4e17af9_IBD_SOLUTION","text":"Medical Imaging","path":null,"children":[{"id":"7780a3f3-3fe2-4f1c-a8f4-f873ed853c45_IBD_DIAGRAM","parentId":"d17e7410-a519-48f1-887a-1644e3a10c78_IBD_SUBSOLUTION","text":"Digital Radiography","path":"/design/interactive-block-diagrams/medical/digital-radiography","children":[]}]}]}]

Pulse Oximeter - Block Diagram

Red and IR light pulses are absorbed depending on the blood oxygen saturation. LEDs and photodiodes are used to measure reflected light from finger.

"longDescription": "Detailed Description of Each Block", "blocks": [ { "name": "Battery Charger", "function": "Responsible for charging the primary/rechargeable battery.", "theory_of_operation": "It receives power from an external source and converts it to the appropriate voltage and current levels required for charging.", "interaction": "Connects to the Primary/Rechargeable Battery to supply charging power. Optional component; system can operate without it if the battery is charged through other means, or if primary battery is used.", "category": "onsemi", "connection": ["Primary/Rechargeable Battery"] }, { "name": "Primary/Rechargeable Battery", "function": "Stores electrical energy and supplies power to the rest of the system.", "theory_of_operation": "Maintains a stable voltage and current supply to ensure continuous operation.", "interaction": "Connected to the Power Management and USB-C Battery Charger for charging, supplies power to other system components.", "category": "Third Party", "connection": ["Power Management"] }, { "name": "Power Management", "function": "Regulates and distributes power to various system components.", "theory_of_operation": "Converts and manages voltage levels to ensure optimal performance of connected components.", "interaction": "Receives power from the Primary/Rechargeable Battery, supplies regulated power to the MCU and auxiliary components.", "category": "onsemi", "connection": ["MCU"] }, { "name": "MCU", "function": "Controls the operation of the system and processes input data.", "theory_of_operation": "Executes programmed instructions to manage system tasks and handle data processing.", "interaction": "Connected to various sensors, the LCD display, and Bluetooth module for data processing and communication.", "category": "Third Party", "connection": ["LCD Display", "Bluetooth", "MCU Auxiliary", "IR LED", "Red LED"] }, { "name": "LCD Display", "function": "Displays processed data and system status information.", "theory_of_operation": "Converts digital signals from the MCU into visual information.", "interaction": "Receives display data from the MCU, provides visual feedback to the user.", "category": "Third Party", "connection": [] }, { "name": "Bluetooth", "function": "Enables wireless communication with external devices.", "theory_of_operation": "Utilizes Bluetooth protocol to send and receive data wirelessly.", "interaction": "Connected to the MCU for data transmission and reception.", "category": "onsemi", "connection": ["MCU"] }, { "name": "MCU Auxiliary", "function": "Provides additional functionality and support to the MCU.", "theory_of_operation": "Complement the MCU's operations by handling specific tasks or enhancing performance.", "interaction": "Connected to the MCU for various auxiliary functions.", "category": "onsemi", "connection": ["MCU"] }, { "name": "IR LED", "function": "Emits infrared for biometric measurements.", "theory_of_operation": "Shine light through a finger, allowing detection of transmitted or reflected light.", "interaction": "Connected to the system to direct light towards the finger component.", "category": "onsemi", "connection": ["IR Photodiode"] }, { "name": "Red LED", "function": "Emits red light for biometric measurements.", "theory_of_operation": "Shine light through a finger, allowing detection of transmitted or reflected light.", "interaction": "Connected to the system to direct light towards the finger component.", "category": "Third Party", "connection": ["Photodiode"] }, { "name": "IR Photodiode", "function": "Detect transmitted or reflected light from the IR LEDs.", "theory_of_operation": "Convert detected light signals into electrical signals for further processing.", "interaction": "Send detected signals to the Signal Conditioning block for processing.", "category": "onsemi", "connection": ["Signal Conditioning"] }, { "name": "Photodiode", "function": "Detect transmitted or reflected light from the LEDs.", "theory_of_operation": "Convert detected light signals into electrical signals for further processing.", "interaction": "Send detected signals to the Signal Conditioning block for processing.", "category": "Third Party", "connection": ["Signal Conditioning"] }, { "name": "Signal Conditioning", "function": "Processes signals received from the photodiodes.", "theory_of_operation": "Amplifies, filters, and converts analog signals into a format suitable for the MCU.", "interaction": "Receives signals from the photodiodes, sends processed signals to the MCU.", "category": "onsemi", "connection": ["MCU"] } ], "interconnections": [ { "source": "Battery Charger", "target": "Primary/Rechargeable Battery" }, { "source": "Primary/Rechargeable Battery", "target": "Power Management" }, { "source": "Power Management", "target": "MCU" }, { "source": "MCU", "target": "LCD Display" }, { "source": "MCU", "target": "Bluetooth Module" }, { "source": "MCU", "target": "MCU Auxiliary Components" }, { "source": "MCU", "target": "IR LED" }, { "source": "MCU", "target": "Red LED" }, { "source": "MCU Auxiliary Components", "target": "MCU" }, { "source": "IR LED", "target": "IR Photodiode" }, { "source": "Red LED", "target": "Photodiode" }, { "source": "IR Photodiode", "target": "Signal Conditioning" }, { "source": "Photodiode", "target": "Signal Conditioning" }, { "source": "Signal Conditioning", "target": "MCU" } ], "Last_update": "2025-07-29",

Pulse Oximeter

Bluetooth - Block

Products

  • Bluetooth Low Energy
    • RSL10

      Radio SoC, Bluetooth® 5.2 Certified

    • RSL15

      Bluetooth® 5.2 Secure Wireless MCU

Technical Documentation

Evaluation Boards/Kits

FAQs

1. What is a pulse oximeter and how does it work?

A pulse oximeter is a non-invasive medical device that measures blood oxygen saturation (SpO₂) and pulse rate. It works by emitting red and infrared light through tissue and detecting absorption differences. Signal processing algorithms calculate oxygen levels and heart rate from the measured optical signals.

2. Why is oxygen saturation monitoring important?

Oxygen saturation monitoring provides immediate insight into respiratory and cardiovascular function. It helps detect hypoxia early, enabling timely medical intervention. Continuous monitoring is especially important in critical care, anesthesia, and home healthcare environments where maintaining adequate oxygen levels is essential for patient safety.

3. How do optical sensors enable pulse oximetry measurements?

Optical sensors use light emitters and photodetectors to measure changes in blood absorption. Red and infrared wavelengths are absorbed differently by oxygenated and deoxygenated hemoglobin. The detected signals are analyzed to determine oxygen saturation, making sensor accuracy and stability critical for reliable readings.

4. How are pulse oximeters used in healthcare applications?

Pulse oximeters are widely used in hospitals, clinics, emergency care, and home monitoring. They support patient assessment during surgery, intensive care, and respiratory therapy. Increasing use in wearable devices and telemedicine extends monitoring capabilities beyond traditional healthcare settings.

5. How does the onsemi Interactive Block Diagram help me select parts and build a worksheet/BOM?

The onsemi interactive block diagram lets you select a taxonomy, choose devices per block, and download a worksheet. If you need a deeper dive into the tool, watch our tutorial video.

Worksheet (BOM) Preview

Worksheet (BOM)

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