krjdev Posted November 20, 2020 Share Posted November 20, 2020 Hi, There is IMHO a wrong calculation of R316 (4.7k) and R317 (1k) from the over-voltage protection for the EFUSE (IC26). According to the reference manual manual of the Zybo-Z7, the maximal input voltage should be 5.7V. But that's not correct. The maximal input voltage is between 5.244V and 5.643V before the EFUSE cuts of the supply from the board. Please take a look in the datasheet from the EFUSE. The negative input from the internal comparator could be between 0.92V and 0.99V. With these two values and the current values of R316 and R317 (without calculated tolerances) the maximum input voltage is between 5.643V (internal comparator input at 0.99V) and 5.244V (internal comparator input at 0.92V). Please can you verify these? And if my calculations correct, update (add a information) the reference manual? Link to comment Share on other sites More sharing options...
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krjdev
Hi,
There is IMHO a wrong calculation of R316 (4.7k) and R317 (1k) from the over-voltage protection for the EFUSE (IC26).
According to the reference manual manual of the Zybo-Z7, the maximal input voltage should be 5.7V.
But that's not correct. The maximal input voltage is between 5.244V and 5.643V before the EFUSE
cuts of the supply from the board.
Please take a look in the datasheet from the EFUSE. The negative input from the internal comparator could be between
0.92V and 0.99V. With these two values and the current values of R316 and R317 (without calculated tolerances) the maximum
input voltage is between 5.643V (internal comparator input at 0.99V) and 5.244V (internal comparator input at 0.92V).
Please can you verify these? And if my calculations correct, update (add a information) the reference manual?
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