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F28075 and F28377D pin descrepancies

Tom Saluzzo
Expert 1280 points

I’ve been importing the schematic design elements for the 28377D and checking them against the 28075 advanced datasheet (176 pin part).  I’ve found a couple of discrepancies and wanted to get some clarification since they are supposed to be pin for pin compatible.

 On the 28377D pin 32 is listed as VREFLOC. On the 28075 pin 32 is listed as VSSA.

I also noticed there are pins for: 

VREFLOA – ADC-A low reference

VREFLOB – ADC-B low reference

VREFLOD - ADC-D low reference

 On the 28075 part there is no VREFLOC…so it looks like that pin has been reassigned to VSSA?  Is that correct? 

Similarly, pin 35 on the 28075 ( VREFHIC, pin 35 on the 28377D part) has been assigned to VDDA.  And correspondingly pins 29, 20 and 31 are no longer labeled ADCINC2,3,4…

 So, it looks like the three ADCs on the 28075 are labeled A, B and D… the pins for the C have been repurposed..(the 28377D has four ADCs).

  • 0
    TI__Guru 60865 points

    Hi Tom,


    Yeah, this is correct. The devices were designed to be pin-to-pin compatible, but the F2807x only has 3 ADCs. 

    When designing the F2807x, the feature set made more sense if ADCC was removed instead of ADCD, so the nomenclature seems a bit strange (ADCA, ADCB, and ADCD), but this maintains code and pin compatibility among the 3 ADCs common to both devices.