TIDUE59A May   2018  – September 2020

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5. 1System Description
    1. 1.1 Key System Specifications
  6. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 CC3220
      2. 2.3.2 CC2640R2F
      3. 2.3.3 DRV8837
    4. 2.4 System Design Theory
      1. 2.4.1 CC3220S to CC2640R2F Interface
      2. 2.4.2 CC3220S to DRV8837 Interface
      3. 2.4.3 Software Architecture
      4. 2.4.4 Network Connection Management
      5. 2.4.5 Provisioning
        1. 2.4.5.1 AP Provisioning and SmartConfig™
        2. 2.4.5.2 Wi-Fi Provisioning Over BLE
      6. 2.4.6 Sending and Receiving Messages Through Cloud
        1. 2.4.6.1 Message Queue Telemetry Transport Protocol
        2. 2.4.6.2 MQTT Client Implementation
      7. 2.4.7 Over-the-Air Updates
        1. 2.4.7.1 HyperText Transfer Protocol
      8. 2.4.8 Security Enablers
        1. 2.4.8.1 Secure Boot
        2. 2.4.8.2 Secure Sockets
          1. 2.4.8.2.1 Hardware Accelerators
          2. 2.4.8.2.2 Simple Network Time Protocol
        3. 2.4.8.3 File System Security
          1. 2.4.8.3.1 Failsafe Files and Bundle Protection
      9. 2.4.9 Low-Power Consumption
  7. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware
        1. 3.1.1.1 CC3220S LaunchPad™ Development Kit
        2. 3.1.1.2 CC2640R2F LaunchPad™ Development Kit
        3. 3.1.1.3 Sensor BoosterPack™ Connections (BMI160)
        4. 3.1.1.4 DRV8837EVM Modifications and Connections
        5. 3.1.1.5 Assembling EVMs
      2. 3.1.2 Software
        1. 3.1.2.1 Getting Started With Software
          1. 3.1.2.1.1 Build simple_np Application and Flash CC2640R2F
          2. 3.1.2.1.2 Use Premade UniFlash ImageCreator Project
          3. 3.1.2.1.3 Importing Project Source Files Into CCS
        2. 3.1.2.2 User Files
        3. 3.1.2.3 Run Wi-Fi® Doorlock Demo
          1. 3.1.2.3.1 Connect CC3220 to Network
          2. 3.1.2.3.2 Networking Functions
            1. 3.1.2.3.2.1 Get Current Date and Time (SNTP)
            2. 3.1.2.3.2.2 Send and Receive Messages (MQTT)
            3. 3.1.2.3.2.3 Perform Software Update Using Dropbox (OTA Update)
    2. 3.2 Testing and Results
      1. 3.2.1 Pass or Fail Tests
      2. 3.2.2 Power Measurements
      3. 3.2.3 Test Setup
        1. 3.2.3.1 CC3220S
        2. 3.2.3.2 CC2640R2F
        3. 3.2.3.3 DRV8837
      4. 3.2.4 Test Results
      5. 3.2.5 Battery Life Estimate
  8. 4Design Files
  9. 5Software Files
  10. 6Related Documentation
    1. 6.1 Trademarks
  11. 7Terminology
  12. 8About the Author
  13. 9Revision History

3.2.3.3 DRV8837

To accurately measure the power consumption of the DRV8837 on the DRV8837EVM, several hardware modifications are required, in addition to the modifications described in Section 3.1.1. The complete list of hardware modifications required to accurately measure the power consumption of the DRV8837 follows (see Figure 3-13):

  • Remove R3 and R4 (0-Ω resistors) from the back of the DRV8837EVM.
  • Remove the LP2985 LDO voltage regulator (REG1) from the back of the DRV8837EVM.
  • Remove the R1 pull down of the DIR pin on the front of the DRV8837EVM.
  • Remove the MSP430G2131 MCU (U1) from the front of the DRV8837EVM.
GUID-8E11C279-C428-4682-82D4-481192842F1B-low.gifFigure 3-13 Back of DRV8837EVM With Components To Remove Highlighted

When the modifications are complete, the following connections must be made to the DRV8837EVM to perform the power measurement (see Figure 3-14).

  • Connect the IN1 and IN2 test points to P16 and P17 of the CC3220 LaunchPad headers, respectively.
  • Connect the top of JP2 (nSleep) to P18 of the CC3220 LaunchPad headers.
  • Connect the bottom of JP2 (VCC of DRV8837) to one of the 3V3 pins on the CC3220 LaunchPad.
  • Apply power across J1 (VM and GND).
GUID-41E5E7B9-2F7F-4F05-883E-BFCD17AA3CA4-low.gifFigure 3-14 Front of DRV8837EVM With Highlighted Components To Remove

When testing the TIDC-01005, a 5-V input was used to power the DRV8837.