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AWR2944: Application problems of chips

Tonyx.wu
Expert 2065 points
Part Number: AWR2944
Other Parts Discussed in Thread: INA226, ,

1. Four 1NA226 current sensors are added to the power supply. Why are these four devices added to meet the ASILB safety requirements?


2.16-Kb I2C CMOS Serial EEPROM, is the Borad ID stored? Is there any special function?


3. What is the function of Temperature Sensor TMP112AIDRLR? Does the temperature of chip self-calibration come from this sensor?

  • 0
    TI__Intellectual 1815 points

    Hi Tonyx.wu,

    1. The four INA226 current sensors are added on the AWR2944 EVM to measure the current being supplied to the various power rails of the device. They can be controlled by the radar via I2C. Can you point me to where it is mentioned that these four devices are added to meet the ASILB safety requirements?
    2. Yes, the board ID is stored in the 16-Kb I2C CMOS Serial EEPROM. There is no special function of the EEPROM wrt device functionality.
    3. The temperature sensor TMP112AIDRLR on the AWR2944 EVM is used to measure the on-board temperature. The chip self-calibration is not done through this sensor. It uses internal temperature sensors present in the AWR2944 device.

    For more details, please refer to AWR2944EVM User’s Guide here: https://www.ti.com/lit/ug/spruj22/spruj22.pdf .

    Regards,

    Swati

  • 0 in reply to Swati Hans
    TI__Guru 58035 points

    Hello Tonyx,

    To add to what Swati mentioned, all the above features are just for development and evaluation purpose. They are not really needed on the final sensor.

    regards,
    vivek

  • 0 in reply to Swati Hans
    Expert 2065 points

    1. Why should we test the current of the power rail to meet the ASILB safety requirements?


    2. When we design the product, can we save the board ID in QSPI flash to save this device


    3. This temperature sensor measures temperature, not for chip self-correction, but for what purpose


    I want to know whether these six devices can be omitted in the actual product design

  • 0 in reply to Tonyx.wu
    Expert 2065 points

    Please help me update the progress of the problem, thank you!

  • 0 in reply to Tonyx.wu
    TI__Intellectual 1815 points

    Hi Tonyx,

    1. We don’t need to measure the current of the power rails to meet the ASILB safety requirements. The current measurements is only for user device evaluation purpose
    2. We can save the board ID in QSPI flash instead of using the EEPROM. You can write on specific Flash offset board ID and keep a disclaimer to not touch that offset. The limitation is that you can only read the flash via the radar device.
    3. The temperature sensor measures the board temperature and is only just for development and evaluation purpose.

    All of these devices can be omitted in the actual product design.

    Regards,

    Swati