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TPS3700: OV detection accuracy

Part Number: TPS3700
Other Parts Discussed in Thread: TMS320F28062, TPS3702

Hi Team,

  My customer want to use TPS3700 for a OV&UV monitor for 3.3V power supply to MCU (TMS320F28062) due to functional safety requirement.

  But we had a major concern on the accuracy issue. Let's take OV for example, TMS320F28062 maximum operating voltage is 3.63V, so we need to shut down the power supply if it reaches 3.63V. And the power supply nominal 3.3V is coming from a LDO : LM1117I, which is at worst 3.432V.  Consider we use 1% res to set the window, and 1% accuracy for TPS3700 over full temp. The headroom for the reliable detection is not quite enough. I wonder what is the solution here?

  The application &spec should be very common in functional safety required application, right? So am I looking it the wrong direction? Thanks.