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CC2652R: Guidance Required for Passive Keyless Entry Key Fob Development

Ramkumar Ramasamy
Prodigy 20 points

Part Number: CC2652R
Other Parts Discussed in Thread: CC2745R10-Q1, UNIFLASH

Hi Team,

Good day..!

I am planning to develop a proof-of-concept Passive Keyless Entry (PKE) system and would appreciate your guidance in selecting the appropriate solution and understanding the overall system architecture.

Specifically, I would like to understand the following:
1. How does a Passive Keyless Entry (PKE) system work from key detection to authentication and unlocking?
2. Could you provide design guidelines for the antennas, including recommended PCB layout practices, matching networks, tuning methods, and reference antenna designs?
3. Is an external MCU required, or are there integrated solutions that include both the MCU and RF functionality?
4. What are the essential hardware components required on:
* the key fob (transmitter)
* the vehicle side (receiver/base station)
5. Which communication technologies are typically used?
6. What factors primarily influence the operating distance (antenna design, transmit power, receiver sensitivity, matching, enclosure, battery voltage, environmental conditions, etc.)?
7. Could you recommend suitable low-cost ICs for both the key fob and vehicle side, along with their datasheets, application notes, evaluation boards, and reference designs?
8. Are there complete reference designs, firmware examples, or software development kits (SDKs) available to accelerate development?
My goal is to understand the complete hardware architecture and select the appropriate components before beginning the design.
I would appreciate any recommended documentation, application notes, reference designs, or evaluation kits that would help me get started.
Thank you for your support.
Best regards,
Ram

  • 0
    TI__Mastermind 44870 points

    Hi Ram,

    Thank you for reaching out! In this case, I would highly recommend considering the CC27XX family of devices. That family of devices supports Channel Sounding and other car access features (such as connection handover, RAS, etc.). I would recommend the CC2745R10-Q1 LaunchPad for evaluation and take a look at the key_node and car_node examples as these are the ones that incorporate channel sounding.

    The following SimpleLink Academies showcase how channel sounding works and how to use it:

    Channel Sounding Getting Started: Car Access Demo — SimpleLink Academy for Low Power F3 SDK

    Bluetooth Low Energy Channel Sounding Fundamentals — SimpleLink Academy for Low Power F3 SDK

    Best Regards,

    Jan

  • 0 in reply to Jan
    Prodigy 20 points

    Hi Jan,

    Good day!

    Thank you for sharing the document. I have gone through it, and I have a few questions.

    My application is for gate access. I will be inside my car while approaching the gate. Will the system be able to detect and allow access in this situation? If yes, what is the maximum reading range or operating distance?

    I understand that the reading range may depend on the antenna. Could you please explain this in more detail? In the reference design, I noticed that two antennas are used. For my application, do I need one antenna or two? Also, how can I achieve the required reading range for vehicle access?

    I also have a few questions about the programming. Could you please explain how the programming works and how the authentication process works? I'm finding it a little difficult to understand from the document.

    If you have any additional documents or guides that explain the system in more detail, could you please share them with me?

    Thank you, and I look forward to your reply.

    Best regards,
    Ram.

  • 0 in reply to Ramkumar Ramasamy
    TI__Mastermind 44870 points

    Hi Ram,

    Happy to help! I believe channel sounding will be applicable to your use-case. I have seen good measurement results in the 10s of meters range which should work well for what youa re looking to implement. The antenna design is critically important for CS. There are a few different antenna design configurations. Typically having more antennas is better for performance but this will depend on factors like the expected environment and housing. I recommend reading details on how CS works at the theoretical level to see how it may impact the performance. The following app note is useful: https://www.ti.com/lit/swra791

    For programming, you may use CCS or uniflash. We also support J-Link. For authentication, CS uses standard BLE pairing and authentication. I recommend referencing some of the Bluetooth LE simplelink academy labs to learn more.

    Best Regards,

    Jan