Programming circuit for DS2502

Other Hardware General Electronics
1

Hi, I'm trying to program a DS2502 eeprom as per the instructions here:

In order to do so, there's a programmer to be made with a couple of transistors and resistors and so far I've had no luck getting in to work on a breadboard.

I'm wondering if the schematic on the github page is correct, it's the upper one on the image below. It seems to me that both arduino pins (I/O and PRGRM) would get +12V in this schematic which would likely damage my arduino. Looking at the datasheet of the DS2502 (extract on the bottom part of the included image) they do differentiate between 12V and VDD. This seems more logical to me. Should VDD just be the 5V on my arduino?

Thanks a lot for your insights,
Jens

schematic
schematic1010×992 63 KB

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There is one on the data sheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ds2502.pdf

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yes, that's the one I posted above.
But I have not been able to get either schematic to work that's why I ask for clarification.. :slight_smile:

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From what I can see VDD should be 5V same as the processor. PGM\ turns on the 12V.

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