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FXTH87xx Measure Time Issue

Question asked by Wayne Lin on Dec 15, 2015
Latest reply on Jan 21, 2016 by David Diaz Marin

Hello

We use software to control I/O high and low to analyze conversion time is 24.5ms (detect pressure + others)

 

But in datasheet define (setting average = 16, should 8.6ms-0.8ms = 9.4ms)

 

We finding input power maybe cause this issue.

 

Use power supply : “normal” (9.4ms)

Use battery : “abnormal” (24.5ms)

 

As this test result  maybe i can say "software is correct" because same board same software never happen with power supply.

 

Could tell me why different between power supply and battery or what situation will cause this state.

 

Others I check MFO (I think maybe MFO cause detect time issue)

But TPMS_MFOCAL always return 255 in datasheet “255 is reserved as an error code for when the external XTAL is not present”

 

Best regards,

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