SLAAE25 May   2021 MSP430FR2355 , MSP430FR2355

 

  1.   Trademarks
  2. 1Introduction
  3. 2Theory of Operation
  4. 3Single-Chip Design
  5. 4Hardware
  6. 5Software
    1. 5.1 Sample and Condition the PIN Diode Signal
    2. 5.2 Sample and Measurement Sequence
    3. 5.3 First Stage DC Tracking
    4. 5.4 Low-Pass FIR Filter
    5. 5.5 Calculate Heart and SpO2
  7. 6Debug GUI
  8. 7Test Result
  9. 8Summary
  10. 9References

8 Summary

The MSP430FR235x comes in a small 6 x 6 mm VQFN40 and 4 x 4 mm VQFN32 package. It integrates four SACs (configurable signal chain), temperature sensor, precise voltage reference, and internal clock oscillators. Overall, it eliminates the use of multiple external components. Thus, MSP430FR235x device not only enables true single chip pulse oximeter design, but also helps in reducing the form factor of the overall solution due to integrated analog signal chain elements.