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Original question:

BQ79631-Q1: BQ79631-Q1 contactor control relay drvier

BQ79631-Q1: Contactor Driver Details

Ravi Prasad A
Prodigy 90 points
Part Number: BQ79631-Q1

Hi,

We are looking for BDU for one of our current projects. Came across BQ79631 EVM seems to be a closer match. Referred the user manual.

Requirements are

1) HV sensing

2) Current measurement using shunt & Hall

3) Isolation measurement

However, the following points are not clear

  • Whether GPIO's are capable of driving the contactor/relay coils directly or the relay drivers are required. If yes, there are no details are available. Please share the details.
  • Whether the system supports CAN or any other communication
  • How to interface the HALL sensor on EVM along with the shunt.

Regards,

Ravi

 

  • 0
    TI__Expert 7000 points

    Hi Ravi,

    Ravi Prasad A said:
    Whether GPIO's are capable of driving the contactor/relay coils directly or the relay drivers are required. If yes, there are no details are available. Please share the details.

    The GPIO pins can be configured as a digital high or low output where the GPIO is pulled up to CVDD = 5V. The GPIO pins have a recommended operating condition of up to 5mA and a max operating condition of 10mA. If the current must be higher to drive the contactor/relay coils, then a driver may be required.

    Ravi Prasad A said:
    Whether the system supports CAN or any other communication

    The 631 supports UART and has an integrated SPI master which uses GPIO pins 4-7 to communicate with SPI peripheral devices. The 631 also uses VIF Daisy Chain communication to communicate with the BQ7961X battery pack monitor ICs and BQ79600 bridge device.

    Ravi Prasad A said:
    How to interface the HALL sensor on EVM along with the shunt.

    TSREF (5V) has the following current limit:

    The hall effect sensor may be powered from TSREF and the output of the hall effect sensor may be read by a GPIO pin that is configured as an ADC input - Absolute.

    Regards,

    David

  • 0
    Prodigy 90 points

    Hi David,

    Thanks for your quick reply. Here is our actual project requirement 

    1) HV sensing (Battery side & DC link side) and fuse health check

    2) Current measurement using shunt or Hall two channels

    3) Isolation measurement

    4)CAN communication

    5)Three contactor controls (24 V) and two contactor feedback (24 V)

    6) HVIL IN & OUT

    7)Emergency stop signal

    BQ79631-Q1 EVM block diagram shows the contactor control relay driver, unable to find the contactor control relay driver circuit. Is there any data about it？

    Please suggest whether BQ79631-Q1 EVM suffices the above requirements if not is there any other suggestion as we are planning a ready-to-use design to meet timelines?

    Regards,

    Ravi

  • 0 in reply to Ravi Prasad A
    TI__Expert 7000 points

    Hi Ravi,

    This device should be able to cover the listed requirements; however, please note that the device communicates via SPI/UART (not CAN).

    Ravi Prasad A said:
    1) HV sensing (Battery side & DC link side) and fuse health check
    Ravi Prasad A said:
    3) Isolation measurement
    Ravi Prasad A said:

    5)Three contactor controls (24 V) and two contactor feedback (24 V)

    6) HVIL IN & OUT

    Figure 9-1 in the datasheet describes a possible implementation for these items using the VSx, AUX, and GPIO pins

    Ravi Prasad A said:
    7)Emergency stop signal

    The nFAULT pin will drive low if faults occur during operation. 

    Regards,

    David