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Old 11th May 2018, 1:49 am   #7
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,484
Default Re: Tesla MH74S571 programming.

Looking at your own promblower.pdf (derived from the S.O.C blower?) from the other thread, I see that VPP is indeed applied to a particular (VPP) pin, but it is also applicable to the data pins of the IC by turning on any one of the associated 3904 transistors when the 'master' VPP control darlington is turned on.

Of course that circuit is to program the NS DM74S571, not the Tesla MH version.
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