SPLA002 July   2026 CC2755R10

 

  1.   1
  2.   Abstract
  3. 1Introduction
  4. 2Profile of CC2755
  5. 3Demonstration of the TI Door Lock Solution
  6. 4Overview of Channel Sounding Technology
    1. 4.1 Basic Principles
    2. 4.2 Ranging method
    3. 4.3 Accuracy and Reliability
  7. 5Overall System Design
    1. 5.1 Overall System Architecture
      1. 5.1.1 Power Design Guidance
        1. 5.1.1.1 Linear Regulator Architecture
        2. 5.1.1.2 Buck Converter Architecture
      2. 5.1.2 Motor Driver Design Guidance
  8. 6CC2755-Based Ranging Implementation
    1. 6.1 Keyless Entry Logic
      1. 6.1.1 Basic Configuration and Calibration
      2. 6.1.2 Real-Time Ranging Process
      3. 6.1.3 Frictionless Unlocking Decision Logic
        1. 6.1.3.1 Intent Judgement
      4. 6.1.4 Unlock Execution and Feedback
      5. 6.1.5 Exception Handling
    2. 6.2 RF Hardware Design
      1. 6.2.1 Key End Solution Selection
      2. 6.2.2 Door Lock End Solution Selection
    3. 6.3 Hardware Reference Design
    4. 6.4 Single Antenna and Multi-Antenna
      1. 6.4.1 Impact of Antenna Quantity on Channel Sounding Ranging Performance
      2. 6.4.2 The Role of Antennas in Phase-Based Ranging
      3. 6.4.3 Analysis of Advantages and Disadvantages of Single-Antenna Configuration
        1. 6.4.3.1 Advantages: Simplicity and Low Cost
        2. 6.4.3.2 Disadvantages: Limited by Multiple Interference Factors
      4. 6.4.4 Analysis of Advantages and Disadvantages of Multi-Antenna Configuration
        1. 6.4.4.1 Advantage 1: Anti-Multipath Capability Brought by Spatial Diversity
        2. 6.4.4.2 Advantage 2: Alleviating Antenna Orientation Sensitivity Issues
        3. 6.4.4.3 Advantage 3: Dual Enhancement of Accuracy and Robustness
        4. 6.4.4.4 Disadvantages: Increased Hardware Complexity and Cost
      5. 6.4.5 Precautions for Dual-Antenna Design
    5. 6.5 Test results
      1. 6.5.1 Hardware configuration
      2. 6.5.2 Software Configuration:
      3. 6.5.3 Environment Setup:
    6. 6.6 Power consumption simulations
  9. 7Summary
  10. 8References

5.1.2 Motor Driver Design Guidance

  • Low-feature smart locks (almost no wireless connectivity, basic locks): Require small size and simple design; motor current chopping/feedback typically does not use current regulation—no inrush current limitation for brushed DC motors; lock position can be determined via Hall or magnetic sensors.
  • High-end smart locks: Require small size, protection features, and position/speed control; utilize current regulation (low-side sensing resistor)—limits inrush current when the motor starts, protecting the battery system and extending battery life.

Table 5‑2 lists the recommended motor driver products for use in electronic lock systems.

Table 5-2 Recommended Motor Driver Products in Electronic Lock Systems

High Performance

/ Cost-Effective

/ New Product

 Part Number Brief Description Package Siz Key Specifications Positioning (Compared with Competitors & Suitability) Supporting Materials

Cost-Effective

/ New Product

DRV8210/P

DRV8212/P

12V, 1.76A H-bridge driver;

12V, 4A H-bridge driver;

SOT563

WSON

High integration, simple design; small size;

DRV8210P/DRV8212P are pin-to-pin compatible with DRV8837C / DRV8837

 Basic locks, no wireless connectivity; small size + low cost, suitable for entry-level smart locks;

DRV8210EVM

TIDA-010266

DRV8212EVM

DRV82xxEVM Hardware Files
High Performance

DRV8847

DRV8832

DRV8833C

18V, 2A H-bridge driver;

7V, 1A H-bridge driver; 10.8V, 1A H-bridge driver;

HTSSOP,

TSSOP,

WQFN;

HVSSOP,

VSON;

HTSSOP,

WQFN;

Features current regulation and independent half-bridge control;

Features voltage regulation (constant speed control);

 High-end locks; requires precise control; inrush limitation extends battery life;

DRV8847EVM

TIDA-010072

DRV8832EVM

Board Files: DRV8830 EVM and DRV8832 EVM
High Performance DRV8876 40V, 3.5A H-bridge driver;

HTSSOP,

VQFN;

 Integrated current sensing and current sensing feedback Small volume, high power, sensorless detection; suitable for high-end locks with compact designs;

DRV8876EVM

slvae68b

TIDA-010073

High Performance

/ New Product

DRV8213

DRV8214

11V, 4A Brushed DC driver;

11V, 4A H-bridge driver

WSON,

WQFN;

WQFN

Integrated current sensing, current regulation, and stall detection;

Ripple counting and I2C interface;

 Small volume, sensorless detection; suitable for high-end locks with compact designs;

DRV8213EVM

DRV8214EVM