Eagle PCB and unconnected inputs
Paul Baker
Posts: 6,351
Im running ERC in EaglePCB and a class of error has arisen, the ERC marks unconnected input pins as an error (Such as the RTCC input to the SX) Should I just strap it to ground? This isn't required for the Atmel CPLD I'm using (it has pin-keeper function which acts as a weak latch) Anyone know how to disable or circumnavigate this error?
Comments
I'm using EAGLE here too, and also come across such errors when running an ERC. I think it is EAGLE's normal behavior to flag any unconnected device pins as arrors (unless you can make a difference in "must" and "can" pins when designing a library item. To be honest, I did not dig too deep into Eagle's library design features.
In case of the RTCC input of an SX, I would either strap it to ground, or pull it up to Vdd via a 4k7 resistor (this is what I usually do). On one hand, this keeps Eagle from reporting that error, and on the other hand, it avoids that the RTCC pin is floating around.
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Greetings from Germany,
G