strange things happening with H-bridge in PCB view

[davidperrenoud]

From jenn...@gmail.com on January 14, 2009 05:48:58

there are two strange things that i notice after wiring the h-bridge

1)The first issue may be a matter of pin mapping. Fritzing seems to think pin 1Y on the h-bridge should be attached to ground in the PCB view.

2)The 2nd think i noticed, I believe was intended as feature rather than a bug: of the 4 ground/heatsinking pins on the h-bridge, fritzing only wires 1 of the 4 when autorouting. The case of the h-bridge may be a little different than arduino since the h-bridge allows for two voltage sources on each side, the two grounds may be isolated. Also, as the wires serve as heat sinks, it might be helpful if the circuit has all it's possible ground/heat sink wires attached to ground.

Original issue: http://code.google.com/p/fritzing/issues/detail?id=473

[davidperrenoud]

From jenn...@gmail.com on January 14, 2009 03:13:40

I took a multimeter to an hbridge that i had and it looks as though all 4 pins (the 2 grounds and the 2 heatsinks) are independent of each other - meaning there is not an internal ground bus between the two ground pins and the heat sink pins. This is an interesting (annoying) case to consider when dealing with autorouting

Cc: co...@irascible.com

[davidperrenoud]

From brendan....@gmail.com on January 14, 2009 03:54:06

I think we can solve this by looking at the datasheet.

[davidperrenoud]

From irasc...@gmail.com on January 16, 2009 13:39:06

the autorouting part of the problem is fixed in r2194 --it had been treating the pins as if they were all on the same bus.

[davidperrenoud]

From jenn...@gmail.com on January 21, 2009 09:29:05

Status: Fixed