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ESDS312: ESD Protection Component Recommendations and System-Level Architecture Design for an Industrial Access Control System

Fatih Cavdarci
Prodigy 40 points

Part Number: ESDS312
Other Parts Discussed in Thread: ESD411, TPD1E10B06, THVD1500

Hi TI Support Team,
We are developing a custom Industrial Access Control System based on an embedded motherboard and are looking for your expert design/component recommendations and architectural guidance for ESD/Surge protection.
Our System Configuration & Peripherals:
  • Motherboard External Interfaces: 1x RJ45 Ethernet, 4x USB Ports, 1x RS485 Interface.
  • Connected Internal/External Devices via USB (5V rails):
    • 1x Card Reader (5V USB, Max Current: 400mA)
    • 1x Palm Guide Sensor (5V USB, Max Current: 500mA)
    • 1x Touch Screen Controller (5V USB, Max Current: 200mA)
  • Display Interface: LVDS Display Screen.
  • Field Network: RS485 output for external long-distance peripheral communication.
We are already utilizing or considering TI components such as TPD4E05U06DQAR, ESDS312DBVR, and TPD4E02B04QDQARQ1 in our designs. However, we need to optimize our power input, USB, Ethernet, and RS485 lines to ensure high reliability.
We would highly appreciate your support on the following 3 questions:
  1. Component Recommendations: Based on our peripheral specifications (especially the 5V USB lines up to 500mA and the RS485/Ethernet interfaces), do you have a specific product or family of products you recommend to suppress ESD/Surge before it reaches the motherboard?
  2. System-Level Strategy: For this type of commercial/industrial access control application, is it technically feasible or practical to aim for absolute ESD isolation (completely blocking ESD from entering the enclosure/system)? Or is the standard engineering practice focused on steering the ESD current safely to the chassis/ground plane to prevent physical IC damage while letting the system recover?
  3. Industrial Industry Approach: What is TI’s general philosophy regarding standard industrial systems (like access control kiosks with face recognition/palm readers, which are neither medical nor space/military)? Does standard industrial compliance typically target complete signal isolation, or is ensuring hardware survivability and self-recovery (IEC 61000-4-2 Performance Criterion B) considered the industry norm?
Thank you in advance for your technical support and product recommendations.
Best regards,
Fatih CAVDARCI
ONES Technology
 
  • 0
    TI__Intellectual 1160 points

    Hello,
    1. I would need to know the abs max, so I could see what clamping voltage you would need. If it is too low, this might be a bit difficult without a deep snapback device. Fortunately, We do plan to release these next year, but let me know the abs max and I can help you out there.

    2. I would aim for going with current steering. Yes, standard practice is clamp at the connector and steer it to ground. Your understanding is correct. 

    3. No, not for "access control kiosks with face recognition/palm readers, which are neither medical nor space/military", this is most likely just RS-485. Correct, the industry norm is IEC 61000-4-2 with Performance Criterion B. 

    Best, 
    Leah Jones

  • 0 in reply to Leah Jones
    Prodigy 40 points

    Hello Leah,

    For your technical review, I have attached the official datasheets/specifications of both components involved in our design:
    1. The Access Card Reader module
    2. The Fujitsu PalmSecure OEM Sensor STD module

    These components connect to the motherboard inside the device via USB.

    As you can see from the specifications, both devices operate on standard 5V USB lines (4.4V - 5.4V for PalmSecure and 4.3V - 5.5V for the Card Reader). Since these are high-level module specifications, the absolute maximum (Abs Max) ratings of the internal silicon transceivers are not explicitly provided.

    However, since both modules are standard USB-powered peripherals, we would highly appreciate your TVS diode recommendations for current steering at the connector based on standard 5V USB data (D+/D-) and power lines.

    Also, please let us know the part numbers or series for the upcoming "deep snapback" devices you mentioned so we can evaluate them for our next design phase.

    Also, Is it an effective approach to design this device to meet Performance Criterion A? (The device is not damaged in the event of ESD or noise.)

    USB connections sometimes freeze or drop; currently, we recover the system by quickly cutting and restoring USB power.

    Thank you for your valuable guidance.

    https://www.elatec-rfid.com/fileadmin/Documents/Data-Sheet/elatec-twn4-multitech-3-m-data-sheet-en.pdf

    https://static.mercateo.com/fd/ef15506b3d834a3a9c85cd701b7e5c10/pdf/ds-PalmSecure-OEM-Sensor-STD.pdf?v=13

  • 0 in reply to Fatih Cavdarci
    TI__Intellectual 1160 points

    Hello, 
    I believe with the specifications that the ESD411 or 441 could work here for the data lines, perhaps the TPD1E10B06 for the VBUS, and THVD1500 for the RS-485. It wouldn't be necessary for your system, but I would recommend it here, as it seems you are using Criterion C currently. Your data lines will stay stable, your connection never drops, and you can avoid the cutting and restoring. 

    I will email you the deep snapback information, not sure If I'm allow to share here. 
     

    Best, 

    Leah

  • 0 in reply to Fatih Cavdarci
    TI__Intellectual 1160 points

    I'm not able to locate your email, could you send me an email? l-jones@ti.com