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TDA3x AVS voltage setting..

Ernest Cho
Expert 3181 points

Hello Champs,

I aware the BOOT and AVS voltage is specified on TDA3x datasheet.
In case of VD_CORE, the BOOT voltage is between min. 1.11V ~ max 1.20V in case of OPP_NOM.

But I found VISION_SDK_02_09_01_00(I know 2.10 is latest but..) TDA3x SBL is defined the BOOT voltage as 1.03V.

So, could you please check and let me know if VD_CORE and VD_EVE is working under 1.11V at BOOT? (ie, 1.03V, 1.06V   respectively) 

https://e2e.ti.com/support/arm/automotive_processors/f/1021/t/557479 

This request is to check 2xLP873x and its 2xDCDC default output values are applicable on my customer's TDA3x application as discussed above e2e thread.

Regards, 
Ernest Cho

  • 0
    TI__Mastermind 30245 points

    Hello Ernest,

    The TDA3xx-SBL will set the AVS voltage which is efused in the sample (not a fixed Boot voltage) with the expectation the initial boot voltage is set appropriately by the PMIC OTP.

    In the very unlikely and very low probability circumstance of an efuse value not being programmed to the device, the driver will program the pre-defined boot voltage as a last resort. Over time the Vmin characterisation team have found that minimum voltage of operation should be higher for devices across process corners to operate properly.

    Boot voltage, 1.03V and 1.06V were found to work on development platforms for a small set of nominal samples earlier before all the characterisation data was available.

    For production systems using TDA3xx samples, the current mentioned lower limit of 1.11 V should be adhered to for proper operation across all samples.

    Vision SDK 2.11 is the latest release. I see that the SW value of the last resort pre-defined boot voltage corresponds to an earlier version of the DM (1.06V/1.03V). I will take an action to update it to the latest DM version. 

    However, the answer to your question is to best stick to the DM recommended NOM 1.15 V value.

    Thanks and Regards,

    Piyali

  • 0
    TI__Mastermind 18180 points

    Ernest,

    Just to clarify  - BOOT voltage corresponds to the time between voltage ramp-up and AVS voltage set by SBL.

    During this time, ROM code runs and can fail to initilize and start the SBL if proper BOOT voltage is not set. ROM code can run for as much as several tens of seconds if it is set to load SBL via UART.

    Regards,

    Stan