Smart Lock Reference Design Enabling 5+ Years Battery Life on 4x AA Batteries


Design files


With the increasing number of building and home owners looking to retrofit smart locks (or electronic locks) to their building or home, wireless battery powered smart locks are becoming increasingly popular in today’s market.  In a smart lock application, the high current motor and radio often drains the battery quickly, causing battery life to suffer.  Replacing multiple batteries can be a time consuming and costly issue, and thus lowering the average current consumption is often a key design consideration.

  • Over 5 years battery life on 4x AA batteries in series
    • 24 lock or unlock events per day
    • BLE radio connection period
  • Motor Driver has integrated FET’s and a current sense comparator which enables easy design and small solution size with minimal discrete components
  • Voltage-based battery gas gauge, integrated DC-DC converter
  • BLE tested using third party BLE iOS and Android applications
  • Configurable advertisement interval up to 4 seconds
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUBV3C.PDF (11544 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRMQ6.PDF (2691 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Stepper motor drivers

DRV883310.8-V, 2-A dual H-bridge motor driver with current regulation

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS627453.3V-10V input, 300mA Ultra Low Iq step-down converter with VSEL and input voltage switch

Data sheet: PDF | HTML
ESD protection diodes

TPD1E10B0612-pF, ±5.5V, ±30-kV ESD protection diode in 0402 and SOD-523 package

Data sheet: PDF | HTML
Low-power 2.4-GHz products

CC2640SimpleLink™ 32-bit Arm Cortex-M3 Bluetooth® Low Energy wireless MCU with 128kB Flash

Data sheet: PDF | HTML
P-channel MOSFETs

CSD25310Q2-20-V, P channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 23.9 mOhm

Data sheet: PDF | HTML
RGB LED drivers

LP552319 channel RGB / White LED driver with internal program memory and integrated charge Pump - WQFN

Data sheet: PDF | HTML

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Technical documentation

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Type Title Date
* Design guide Smart Lock Reference Design Enabling 5+ Years of Life on Four AA Batteries (Rev. C) Jun. 11, 2018
White paper Extending Battery Life in Smart E-Locks (Rev. A) Jun. 04, 2020
Technical article Power topology choices for power-hungry devices Aug. 09, 2017
Technical article Collecting environmental data with less energy and wiring May 23, 2017
Technical article Increasing battery life in IoT devices May 05, 2017
Technical article IoT is making buildings greener and more intelligent. Value versus affordability Jan. 04, 2017

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