TIDUF52 December   2023 MSPM0L1303 , MSPM0L1304 , MSPM0L1305 , MSPM0L1306 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Photoelectric Smoke Detector Background – DC-Based Signal Chain
      2. 2.2.2 Modulation-Based Smoke Detection Signal Chain
      3. 2.2.3 Optical Sensing AFE Design
        1. 2.2.3.1 TIA
        2. 2.2.3.2 BPF
        3. 2.2.3.3 Demodulator and Integrator
        4. 2.2.3.4 LED Driver
      4. 2.2.4 Optical and Mechanical Design
    3. 2.3 Highlighted Products
      1. 2.3.1 MSPM0L1306
      2. 2.3.2 TLV9062S
      3. 2.3.3 TPS7A24
      4. 2.3.4 TS5A623157
      5. 2.3.5 SN74LVC1G66
      6. 2.3.6 HDC2010
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
      1. 3.1.1 Power
      2. 3.1.2 Communication Interface
      3. 3.1.3 Headers
    2. 3.2 Software Requirements
      1. 3.2.1 Getting Started Firmware
      2. 3.2.2 Measurements and Smoke Detection
      3. 3.2.3 Additional Demonstration Functionality
      4. 3.2.4 Smoke Detector GUI
    3. 3.3 Test Setup
      1. 3.3.1 UL217 Smoke Box and Fire Testing Setup
      2. 3.3.2 Ambient Light Testing Setup
      3. 3.3.3 Air-Quality Sensing Test Setup
    4. 3.4 Test Results
      1. 3.4.1 UL217 Testing Results
      2. 3.4.2 Ambient Light Testing Results
      3. 3.4.3 Air-Quality Sensing Test Results
      4. 3.4.4 Power Testing Results
      5. 3.4.5 Fire Room Smoke Testing
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
      3. 4.1.3 CAD Files
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

3.4.4 Power Testing Results

The total system power is measured with a 9-V input supply. Table 3-3 summarizes the total current consumption for the 9-V battery. For typical low-power mode operation (number of pulses = 16; sampling time = 10 s), the average current is measured to be 5.8 µA as shown in Figure 3-18. This demonstrates the 10-year battery life capability using a standard 9-V alkaline battery typically used in smoke alarms. Figure 3-19 shows the average current consumption for the high-power mode which is entered when smoke is first detected and the early-warning threshold TH0 is exceeded.

Note that the power is measured without UART communication enabled. Current consumption results in other configurations are also provided in Table 3-3.

Table 3-3 System Current Consumption for 9-V Battery With Different Configurations
NUMBER OF PULSES SAMPLE TIME CURRENT (µA)
16 10 5.8
16 1 17.4
128 1 75.7
300 1 127
GUID-20231020-SS0I-CCCP-KMP3-80Q1QGPZKRRS-low.png Figure 3-18 Transient Current Waveform of SASI Smoke Detection Module for Low-Power Mode (Number of Pulses = 16, Sample Period = 10 s)
GUID-20231020-SS0I-WPCF-JQSS-BP0KCSL0SH4S-low.png Figure 3-19 Transient Current Waveform of SASI Smoke Detection Module for High-Power Mode (Number of Pulses = 300, Sampling Period = 1 s)