3v3 for LPCExpresso
The LCPExpresso needs 3v3 power circuit. Can we add that to the board? What is needed for that?
#1 Updated by Anonymous almost 6 years ago
Good idea - I'm using an MCP1703-3.3V (there are also TO-92 packages, and MCP1702 is equivalent). No extra parts, things are stable as far as I can tell. Note that these regulators don't all use the same pinout.
For the connections, see my recent weblog post.
#7 Updated by peter almost 6 years ago
The MBED is rated at 220mA max
so with the 3v3 to the pololus we may exceed the 250mA max of the 3v3 regulator.
We could search for a 3v3 regulator with higher current rating (500mA) or power the pololus with 5V.
The latter is possible, because the 3V3 logic voltages will still be in the 0/1 range (although they could
be more susceptible to noise). 5V would make interfacing external steppers and RS422 stepper signal easier.
B.t.w. The jumper is not required: if you do not place the component on the board, there is no contact.
#8 Updated by jaap almost 6 years ago
- Tracker changed from Bug to Feature
- Status changed from Resolved to In Progress
Jumper is placed there so you can still use the board with MBED as well.
Alternative voltage regulator: Farnell order no: 9388338
Would that one do the trick? If so, I will adapt the board layout for that one.