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BQ76PL536A-Q1: Functional Safety IEC60730 Certification

Panagiotis Verras
Prodigy 115 points
Part Number: BQ76PL536A-Q1
Other Parts Discussed in Thread: BQ76PL536, BQ79606A-Q1

Hello,

I was advised by customer support to post the query here. 

We are trying to get a Li-Ion safety system using the BQ76PL536A-Q1 through certification for IEC60730.

The company responsible for the certification insists that the device contains firmware and it has to be evaluated based on the IEC60730.

We are looking for

A. Evidence that the BQ76PL536A-Q1 does not contain firmware. 

B. Any functional safety documentation/certificates that the device has.

As this is an add-on system to a current BMS we are not using the device with a host MCU rather as a stand alone protector for OV/UV/OT driving a separate protection loop.

We are aware that device does not contain firmware or an internal MCU but unfortunately certification specialists insist that without details from TI they cannot certify the product.

I'm sure other customers have also tried to certify their batteries, how did they go about doing it?

  • 0
    TI__Genius 17370 points

    Hi Panagiotis,

    The bq76pl536 does not contain CPU, program counter or program instruction memory. It is not a programmable device executing a software program code.

    The bq76pl536 includes 8 registers of 8 bits of EPROM that set the following internal configuration settings

    - ADC conversion time, reference source, number of battery cells

    - SPI CRC disable

    - over voltage threshold and detection timing

    - under voltage threshold and detection timing

    - over temperature threshold and detection timing

    Programming of the EPROM takes place during system manufacturing. The EPROM bit value are transfer into digital logic registers when the IC is powered up or reset and is not intended to vary during program execution. Hopefully this helps clarify the evidence. As for functional safety documentation we do not provide any of this for this device.

    Regards,

    Taylor

  • 0 in reply to Taylor Vogt
    Prodigy 115 points

    Hi Taylor,

    Thank you very much for your response. It's good to have this confirmation, hopefully it will be sufficient for the certification people. 

    As an alternative, is the protector on BQ79606A-Q1 the same? can the secondary protection on this device operate without a host controller? I only ask because that device has the ASIL-D certification and might be a way out if no resolution is found with the simpler 536.

    Thank again,

    Panagiotis

  • 0 in reply to Panagiotis Verras
    TI__Genius 17370 points

    Hi Panagiotis,

    The bq79606A-Q1 device is similar in terms of not containing firmware, but has more advanced functional safety features and we provide documentation (the safety manual is online) in order to meet your standards.The comparators for OV/UV functionality can be operating without constant host control, but in order to actually see the fault, the host would need to take further action after seeing the fault.I will close this thread since the original question is resolved, please open a new thread if you have further questions so it is not lost in the shuffle.

    Regards,

    Taylor