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

(ACTIVE) TIDA-00757

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Key Document

Description

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.

Features
  • 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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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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TI Devices (6)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CC2640  SimpleLink ultra-low power wireless MCU for Bluetooth low energy  SimpleLink Solutions  Sample & Buy View Design Kits & Evaluation Modules
CSD25310Q2  20-V P-Channel NexFET Power MOSFET, CSD25310Q2  MOSFETs  Sample & Buy Not Available
DRV8833  2A Low Voltage Dual Brushed DC or Single Bipolar Stepper Motor Driver (PWM Ctrl)  Motor drivers  Sample & Buy View Design Kits & Evaluation Modules
LP55231  9 Channel RGB / White LED Driver with Internal Program Memory and Integrated Charge Pump - WQFN  LED drivers  Sample & Buy View Design Kits & Evaluation Modules
TPD1E10B06  Single-Channel ESD in 0402 Package With 10pF Capacitance and 6V Breakdown  Circuit protection  Sample & Buy View Design Kits & Evaluation Modules
TPS62745  10V Ultra Low Iq Step-Down Converter with VSEL and input voltage switch  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CC2640 Download Download
Download Download
Download Download
CSD25310Q2 WSON (DQK)| 6 Download
DRV8833 Download
Download Download
Download -
LP55231 Download
TPD1E10B06 Download Download
TPS62745 Download Download

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 11544 11 Jun 2018 0
Design files (6)
Title Abstract Type Size (KB) Date Views TI Recommends
ZIP 786 02 Aug 2018 0
ZIP 1234 02 Aug 2018 0
PDF 106 02 Aug 2018 0
PDF 313 02 Aug 2018 0
PDF 2691 07 Jul 2016 0
PDF 254 07 Jul 2016 0
Related Tools & Software

Software (1)



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