SLAA897 June   2019 MSP430FR2353 , MSP430FR2355

 

  1.   MSP430’s Analog Combo Enables True Single-Chip Pulse Oximeter Designs
    1.     Trademarks
    2. 1 Introduction
    3. 2 Proposed Single-Chip Design
      1. 2.1 Using SAC to Generate the LED Drive
      2. 2.2 Using SAC as TIA and Gain Stage
      3. 2.3 Power Management
    4. 3 Key Benefits
    5. 4 Summary
    6. 5 References

2 Proposed Single-Chip Design

Figure 2 shows the proposed block diagram of a single-chip pulse oximeter design using the MSP430FR235x. All four SACs are utilized optimally: two for the LED drive stage (Red and IR) and other two for the photodiode signal conditioning (TIA and gain stage). Internal clocks and voltage references are selected to minimize the use of external components thus reducing the overall Bill of Material (BoM) cost as well as the footprint of the design.

slaa897-proposed-block-diagram-of-a-single-chip-pulse-oximeter-design-using-msp430fr235x.gifFigure 2. Proposed Block Diagram of a Single-Chip Pulse Oximeter Design Using MSP430FR235x