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TPS3306: Watchdog along with TI CPU and LDO

Saif Rawas
Prodigy 20 points
Part Number: TPS3306
Other Parts Discussed in Thread: SM320F28335-EP

Hi TI AE,

 

I have a few questions on the voltage tolerances of each device (MCU, Watchdog IC, and LDO) all from Texas Instruments.  It seems that we have wide tolerance on the TPS3306 Vsense which can affect performance due to unintentional resets. 

Supervisor IC: TPS3306

MCU IC: sm320f28335-ep

LDO IC: TPS767D301

The supply voltage output of the LDO over laps with the tolerances of the watchdog.  This ultimately affects potentially low percentage of our units with unintentional resets that is unacceptable in a complete system case.  We are trying to size the resistors, and adjust the supply voltage of our current design to have the right thresholds.

 

Can you support by giving us a Histogram of the Output Voltages of the LDO (ATE Lot Data for example and or DOE); and Histogram of Vsense Voltages for the TPS3306 part.  We will need to depend on this data to ensure we have Zero Margin of Error.

 

 

Thanks,

Saif

  • 0
    TI__Genius 12630 points

    Saif,

    We don't typically provide the ATE Lot Data and we can only guarantee that Vsense will be between the MIN and MAX values listed in the Electrical Characteristics table found in the datasheet. I know that TPS3306 is around 2% voltage sense accuracy and we have devices with less than 1% accuracy available. Can you provide me more information on the application and how this Voltage Supervisor is being used so we can make sure you are using the correct device? Any information you can provide regarding the business case for this application will also be useful. If any information is sensitive, feel free to email me directly at michaeldesando@ti.com

    Thanks!

    -Michael (Voltage Supervisor Application Engineer)