SLAA835B May   2018  – August 2018 MSP430FR2353 , MSP430FR2355

 

  1.   Smart Analog Combo Enables Tomorrow's MCU-Based Sensing and Measurement Applications
    1.     Trademarks
    2. 1 Introduction
    3. 2 Smart Analog Combo Applications
      1. 2.1 Smoke Detection
      2. 2.2 Gas or PM2.5 Detector
      3. 2.3 Blood Glucose Meter or Oximeter
      4. 2.4 Current-Loop Transmitter
      5. 2.5 Small Form-factor Pluggable (SFP) optical transceivers
      6. 2.6 Audio Applications
    4. 3 Conclusion
    5. 4 References
  2.   Revision History

2.4 Current-Loop Transmitter

One 12-bit DAC loads a lookup table of a sine wave, with the other smart analog combo is used as a low-pass filter and a voltage-to-current converter with an external bipolar-junction-transistor (BJT) amplifier. Figure 5 shows a current-loop transmitter application using two smart analog combo SAC-L3 configurations. TI offers a 4- to 20-mA loop-powered resistance temperature detector (RTD) temperature transmitter reference design based on the MSP430FR2355 MCU using two SAC-L3 modules.

block-diagram-current-loop-transmitter.pngFigure 5. Block Diagram of a Current-Loop Transmitter Using the MSP430 Smart Analog Combo