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Published 20 hours ago • verified publisher icon jasonsbeer

Note on U109, XCLKEN

Open jasonsbeer opened this issue 2 years ago • 0 comments

ISSUE: The XCLKEN pin is lacking a pullup resistor, which could result in the 74HC258 switching to the XCLK signal when there is not one present.

SEVERITY: There have been no reports of this happening as of this time.

SCOPE: Rev 2.x boards only.

PROPOSED FIX: In the event you do not get a 28MHz clock from pin 12 of U109, add a 10k pullup to pin 1 of U109. You can attach the pullup to any +5V source. C109 is nearest. Target future revision for fix.

jasonsbeer avatar Jul 13 '22 13:07 jasonsbeer