TIDUEZ4 May   2021

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   5
  6. 1System Description
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1 SimpleLink MCU
        1. 2.2.1.1 CC3235MODS
        2. 2.2.1.2 CC1352R LaunchPad
          1. 2.2.1.2.1 CC1352R
      2. 2.2.2 Power
        1. 2.2.2.1 TPS63802
        2. 2.2.2.2 TPS63900
        3. 2.2.2.3 TPS62825
        4. 2.2.2.4 TPS7A03
        5. 2.2.2.5 TPS7A20
        6. 2.2.2.6 TPS62840
        7. 2.2.2.7 TPS22919
        8. 2.2.2.8 LM66100
      3. 2.2.3 Peripherals
        1. 2.2.3.1 OPT3004
        2. 2.2.3.2 DRV8837C
        3. 2.2.3.3 TPA2011
        4. 2.2.3.4 TLV61048
      4. 2.2.4 OmniVision Video Encoder OA7000
      5. 2.2.5 OmniVision Image Sensor SP2329
      6. 2.2.6 YTOT Lens Module
    3. 2.3 Design Considerations
      1. 2.3.1  Input Power: Battery and USB
      2. 2.3.2  Power Requirements
      3. 2.3.3  Camera Wake-up and Day or Night Sensing
        1. 2.3.3.1 PIR and MSP430 Based Motion Detection Design for Low Cost and High Performance
      4. 2.3.4  Battery Gauging
      5. 2.3.5  IR LED Illumination
      6. 2.3.6  IR Cut Filter
      7. 2.3.7  Audio
      8. 2.3.8  System Operation
      9. 2.3.9  Wi-Fi and Host Subsystem
      10. 2.3.10 Firmware Control
        1. 2.3.10.1 Application Flow
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware
    2. 3.2 Software
    3. 3.3 Setup
      1. 3.3.1 Configuration Steps for Video over Wi-Fi
      2. 3.3.2 (Optional) Flash OA7000 With Latest Firmware or Stream Video Over USB
      3. 3.3.3 Audio Streaming
      4. 3.3.4 LPSTK-CC1352R Configuration Steps for Camera Module
    4. 3.4 Test Results
      1. 3.4.1 Power Supply Rails and Current Consumption
      2. 3.4.2 Battery Life Calculations
      3. 3.4.3 Video Streaming
      4. 3.4.4 IR LED Drive
  9. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 Bill of Materials
    2. 4.2 Software
    3. 4.3 Support Resources
    4. 4.4 References
    5. 4.5 Trademarks
  10. 5About the Author

3.4.1 Power Supply Rails and Current Consumption

Standby Mode: The CC1352R LaunchPad is mounted on the camera module. The CC1352R wakes up the system (Wi-Fi and image processor) on receiving a wake-up trigger. This wake-up trigger can be a PIR activity or video doorbell button press or a network trigger. If no trigger is received, the system is in standby mode. This mode also serves as a low-power mode for the camera. In this state, only battery gauging is supported at regular intervals and the rest of the blocks are in sleep or hibernate mode. The current drawn from 5 V battery in this mode is approximately 2 mA. Note that CC1352R software example is not optimized for power: Wake on radio also consumes more power. A developer can optimize the sensors on the Launchpad and the RX/TX duration of CC1352R to reduce the current consumption. Longer preamble on TX will increase the response time, but decrease the current consumption on the RX side.

Active Mode: Once a wake-up trigger is received by the CC1352R, it activates the main host MCU, that is, Wi-Fi, video encoder and the necessary power rails. This state is referred to as active mode for the camera. Here, additional functions are available: ambient light sensing, video streaming over Wi-Fi or over USB. The current drawn from a 5 V battery in active mode is approximately 200 mA during video streaming. Note that CC3235MODS SW is not optimized for power. Table 3-1 illustrates the test conditions and the expected current consumption from the battery rail.

Figure 3-20 and Figure 3-21 shows the power-up and power-down sequence as seen in the camera module. Individual delays for each rail can be modified by setting the appropriate R/C in the schematic design to meet the power up/down requirements as suggested in the OA7000 datasheet.

Table 3-1 Test Conditions and the Expected Current Consumption From the Battery Rail
STATETEST CONDITIONSCURRENTVOLTAGE RAIL
Standby modeWireless camera module with CC1352R LaunchPad mounted2 mA5 V battery connection
Functions operational: battery-gauging, wake-up based on network, doorbell, PIR; Wi-Fi in hibernate mode
Active mode

Additional functions: Wi-Fi, sensing, video encoder enabled and powered-up

Functions not enabled: IR LED drive, IR cut filter and audio

178 mA
Active mode with video streamingAdditional functions: video streaming on-going212 mA
GUID-20210422-CA0I-G81J-HFRR-1NZGZHJD1CG4-low.pngFigure 3-18 Current Consumption From Each Rail: C1-VOUT1 (3.3 V), C2-1.35 V, C3-1.1 V, C4-1.8 V
GUID-20210422-CA0I-F8GZ-WH3T-VK1GMDTKVVFP-low.pngFigure 3-19 Current Consumption Zoomed in From Each Rail: C1-VOUT1(3.3 V), C2-1.35 V, C3-1.1 V, C4-1.8 V
GUID-20210422-CA0I-LZNB-J7TX-Z5DZP9SMD9LN-low.pngFigure 3-20 Power-up Sequence
GUID-20210422-CA0I-G67V-10CD-DWSDMFCN5JG3-low.pngFigure 3-21 Power-down Sequence