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TPS65381A-Q1: Functional safety and power function realization

SHOGO OZONO
Prodigy 60 points
Part Number: TPS65381A-Q1

Dear Specialists,

Is it impossible for the TPS65381A-Q1 to support the monitoring function and the power supply function?

Customers want to support  functional safety.

In order to realize functional safety, monitoring function and power supply function are required.

But,customer was told that apart from the monitoring function using the TPS65381A - Q1, power supply IC is required externally by Partner company.

I appreciate your great help in advance.

Best regards,

Shogo

  • 0
    TI__Mastermind 20590 points

    Hi Ozono-san,

    The TPS65381A-Q1 is a Multirail Power Supply for Microcontrollers in Safety-Relevant Applications.  Another high level name would be PMIC (Power Management IC) with various diagnostics for functional safety applications including multiple voltage regulators (power supplies), independent voltage monitoring (supervision, independent from regulation for functional safety), and diagnostic coverages such as built in self test, watchdog (Q&A mode and window mode) to provide coverage for MCU software, MCU error signal monitor to provide coverage for MCU hardware for MCUs with error signal outputs, and other protection, monitoring and diagnostic coverage features. 

    Please review the datasheet at: http://www.ti.com/lit/gpn/tps65381a-q1    it will explain the multiple power supply rails, monitoring, protection and diagnostic coverage features in detail.

    The functional safety manual for the device is at: http://www.ti.com/lit/pdf/slva528   which provides the first level of insight into how to use power supply and monitoring in systems with a focus on the functional safety features. 

    This device is part of the SafeTI products for functional safety so additional functional safety documentation is available with appropriate non disclosure agreement coverage. Using the FMEDA the customer can calculate the necessary functional safety metrics of how the device is used in their system. 

    In addition if the VDD1 and/or VSOUT1 voltage regulators are not used by the customers application, their monitoring function can be re-used to monitor another voltage rail in the system.  One example is if the MCU core rail or other system rail requires more current than the integrated rails on this device can provide, and external DCDC regulator can be used and the voltage monitoring from the VDD1 or VSOUT1 rail could be used on the external rail so there is a lot of flexibility in how to use the device for both power supply and monitoring.

    Hopefully that helps.

    Please ask any additional questions. 

    Best Regards,

    Scott