The Integrated Context Engine (ICE) for Biosensing includes:

  • Renesas OB1203 reflective photoplethysmography (PPG), proximity (PS) and light / color (LS/CS, not used for this application) sensor
  • Telink’s TLSR8258F512 micro controller with Bluetooth Low Energy (BLE) radio.
  • LiPo’s LP201030 rechargeable Li-ion battery, 3.7 V, 40 mAh, 10 x 30 x 2 mm3.

The ICE hardware performs reflective, non-invasive measurements (for example at the fingertip), transmits the data via BLE to a smartphone or tablet, where the Heart Rate (HR) and blood oxygen saturation (SpO2) are determined by an Android app. During this process the proximity sensor function keeps the measurement running as long as there is a finger present.


  • OB1203 Sensor Features
    • Highly reliable and industry-proven OSIP package with integrated cover glass for hypoallergenic products
    • Integrated and factory trimmed LED source, driver and photodetector
    • PPG (Heart Rate and Blood Oxygen Concentration):
      • Aesthetic industrial design options with unique farredLED allowing SpO2 measurements behind visibly dark, IR-transmissive ink.
      • 16 to 18 bits output resolution
      • High speed sampling up to 3200 samples per second for highest resolution and improved SNR
      • On-chip averaging and FIFO data storage enable convenient asynchronous access to data
    • Proximity Sensor:
      • Up to 16 bits resolution
      • Ambient light suppression
      • Analog and digital crosstalk cancelation
    • Wide operation temperature range: -40°C to +85°C
    • Wide supply voltage range:
      • 1.7V to 3.6V for digital / analog
      • 3.3 V to 5.0 V for LEDs
    • I2C interface capable of 100kHz or 400kHz communication
    • Programmable level-based interrupt functions
    • Industry’s smallest package: 4.2 x 2 x 1.2 mm3 14-pin module
  • Radio Module Features
    • Telink TLSR8258F512
      • BT 4.2 BLE 2.4 GHz radio
      • 32-bit MCU @48MHz 512 kB flash, 32 kB SRAM
      • Wide supply voltage range: 1.9V to 3.6V
      • Compact size: 32 pin, 5.0 x 5.0 x 0.75 mm3 package
  • ICE Characteristics
    • PCB:
      • Operation temperature range: -40°C to +85°C
      • PCB supply voltage range: 3.3 V to 6.5V
      • PCB: 40mm x 11mm (20mm with program pads) x 5.0 mm with USB charge connector (3.1 mm without)
      • Program pad PCB section removable
    • Battery life:
      • 150x 30 s measurements
      • Typical PCB quiescence current: 0.5 μA at 4 V
      • Battery capacity: 40 mAh if charged up to 4.2 V
      • Battery operation: 3.3 V to 4.2 V
      • Rechargeable via USB Micro cable
      • > 70 % shelf: 1 year stored (-20°C to 30°C)
      • Battery operating temperature range -20C° to + 60°C

Product Options

Part Number Part Status Supply Voltage (V) Pkg. Type Temp. Range Buy Sample
Preview 3.3 - 4.2 KIT 0 to 70°C

Documentation & Downloads

Title Other Languages Type Format File Size Date
User Guides & Manuals
OB1203SD-BT-EVK Evaluation Kit Manual Manual PDF 843 KB
Application for OB1203SD-BT-EVK.apk Software APK 1.57 MB
OB1203SD-BT-EVK BOM Design File CSV 1 KB
OB1203SD-BT-EVK Gerber Files Design File ZIP 7.47 MB
OB1203SD-BT-EVK Schematics Schematic PDF 44 KB