SPRADL9 February   2025 CC1310

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Sensor Controller in Building Automation
    2. 1.2 TI Devices
      1. 1.2.1 CC13x4 Wireless MCUs
      2. 1.2.2 CC26xx Wireless MCUs
  5. 2Sensor Controller
    1. 2.1 Features
    2. 2.2 Sensor Controller Power Modes
      1. 2.2.1 Active Mode
      2. 2.2.2 Low Power Mode
      3. 2.2.3 Standby Mode
      4. 2.2.4 Switching Between Power Modes
        1. 2.2.4.1 24MHz - Startup From Standby and Return to Standby Energy
        2. 2.2.4.2 2MHz - Startup From Standby and Return to Standby Energy
    3. 2.3 Power Measurement Setup
      1. 2.3.1 EnergyTrace™ Software
      2. 2.3.2 Software
      3. 2.3.3 Current Consumption Measurements
      4. 2.3.4 Hardware
  6. 3Building Automation Use-Cases and Techniques using Sensor Controller
    1. 3.1 PIR Motion Detection
      1. 3.1.1 PIR Traditional Signal-Chain
      2. 3.1.2 Capacitor-less Motion Detection Block Diagram
      3. 3.1.3 Digital Signal Processing
        1. 3.1.3.1 Hardware
        2. 3.1.3.2 Digital Signal Processing
    2. 3.2 Glass Break Detection
      1. 3.2.1 Low-Powered and Low-Cost Glass Break Block Diagram
    3. 3.3 Door and Window Sensor
    4. 3.4 Low-Power ADC
      1. 3.4.1 Code Implementation in Sensor Controller Studio
      2. 3.4.2 Measurements
    5. 3.5 Different Sensor Readings with BOOSTXL-ULPSENSE
      1. 3.5.1 Capacitive Touch
      2. 3.5.2 Analog Light Sensor
      3. 3.5.3 Potentiometer (0 to 200kΩ range)
      4. 3.5.4 Ultra-Low Power SPI Accelerometer
      5. 3.5.5 Reed Switch
  7. 4Summary
  8. 5References

3.5.3 Potentiometer (0 to 200kΩ range)

A potentiometer consists of a resistive element and a movable wiper which adjusts the resistance moving along the element offering a variable voltage output. This makes potentiometers designed for dimmer switches for light control and able to regulate fan speeds, airflow and temperature settings by adjusting resistance in the control circuit to state some examples.

The potentiometer on the BOOSTXL-ULPSENSE is connected as a voltage divider. The example uses COMPA and the reference DAC to implement a SAR-ADC. The potentiometer example is tested with the potentiometer set to the middle position. The Sensor controller can wake up with a rate of 25Hz, and if a change is detected, the Sensor controller can wake up and notify the System CPU.

Table 3-5 Potentiometer Power Consumption
Average current consumptionUnitBattery life (CR123)
Potentiometer stationary (25Hz)2.1µA10 years
Potentiometer moving14.7µA1year and 6 months
Potentiometer: Middle -30 secondsFigure 3-21 Potentiometer: Middle -30 seconds
Potentiometer: Middle -1 secondsFigure 3-22 Potentiometer: Middle -1 seconds
Potentiometer: Middle -One MeasurementFigure 3-23 Potentiometer: Middle -One Measurement
Potentiometer: Moving -30 secondsFigure 3-24 Potentiometer: Moving -30 seconds
Potentiometer: Moving -1 secondFigure 3-25 Potentiometer: Moving -1 second
Potentiometer: Moving -One MeasurementFigure 3-26 Potentiometer: Moving -One Measurement