Automotive Bluetooth® Low Energy car access satellite node reference design
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Key Document


This reference design is intended for Passive Entry Passive Start (PEPS) car access systems that utilize Bluetooth® Low Energy (BLE) technology to determine the location of a key fob. The design exhibits how a vehicle BLE satellite node can be implemented to calculate the angle of arrival (AoA) from a BLE signal and transmit the AoA data via local interconnect network (LIN) using only a single BLE wireless microcontroller and LIN transceiver. Furthermore, the design demonstrates that accurate AoA information can be calculated using only two dipole antennas reducing the printed circuit board (PCB) solution size.

  • Measure AoA using BLE with only 2 dipole antennas
  • Share BLE connection information, AoA and RSSI information via LIN
  • Small 45.72 mm × 76.2 mm (1.9" × 3.0") PCB solution size
  • Low-power sleep mode with remote wake over LIN < 25 µA at 14 V
  • DC input voltages from 4.65 V to 40 V and load dump voltages up to 45 V
  • Compatible with TI's Real Time Locationing System (RTLS) software toolbox for triangulation and trilateration of a BLE key fob

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Schematic/Block Diagram

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Design Guide

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Design Files

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CC2640R2F-Q1  SimpleLink™ automotive qualified 32-bit Arm Cortex-M3 Bluetooth® Low Energy wireless MCU  Wireless connectivity  Sample & Buy View Design Kits & Evaluation Modules
TLIN1029-Q1  Local interconnect network (LIN) transceiver with dominant state timeout  Interface  Sample & Buy View Design Kits & Evaluation Modules
TPS7B82-Q1  Automotive 300-mA, off-battery (40-V), ultra-low-IQ, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
CC2640R2F-Q1 Download Download
TLIN1029-Q1 Download Download
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TPS7B82-Q1 Download
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Technical documentation

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Application note (1)
Title Type Size (KB) Date
PDF 23331 06 May 2019
User guide (1)
Title Type Size (KB) Date
PDF 4845 15 Jan 2019
Design files (6)
Title Type Size (KB) Date
PDF 285 25 Jul 2019
ZIP 499 25 Jul 2019
ZIP 917 25 Jul 2019
PDF 99 25 Jul 2019
PDF 150 25 Jul 2019
PDF 1062 07 Dec 2018
Related Tools & Software

Software development (1)

Name Part Number Software Type
SimpleLink™ CC2640R2 SDK - Bluetooth® low energy  SIMPLELINK-CC2640R2-SDK  Software development kit (SDK) 

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