MainIO Schematic Review

[dawiggleman]

Review of MainIO schematics

[dawiggleman]

1) Add title page with title and board revision number 2) Add sub-titles to each page, to tell which circuit you are displaying 3) Add reference designators to all parts (tools --> annotation --> annotate schematics quietly (for a flat hierarchy design))

Is this where CAN swaps TX/RX? Regardless, maybe add a note denoting this is the correct orientation

What's the voltage drop on this LED? If it's < 1.6V or so, probably want a larger resistor so your current is < 25mA

Make note on Crystal to route according to datasheet:

[dawiggleman]

Add no ERC directives to unused pins in shutdown circuit:

For entire shutdown circuit: label what each "node" is protecting (i.e. IMD, E-stop switch)

Explain/title what this circuit does:

I'd check that the relay can be driven with current flowing this way (B field will be different). (It's opposite in all your other circuits):

There's no power attached to Vin on this regulator:

Why use a 10,000pf part when you've got lots of 0.1 uf parts elsewhere? (Bom reduction)

Put note on expected holdup time/reason for all these caps:

[mmfarah]

"Is this where CAN swaps TX/RX? Regardless, maybe add a note denoting this is the correct orientation"

• Yes, a note has been added to clarify

"What's the voltage drop on this LED? If it's < 1.6V or so, probably want a larger resistor so your current is < 25mA"

• The voltage drop is 2V with a forward current of 20mA.

"Why use a 10,000pf part when you've got lots of 0.1 uf parts elsewhere?"

• 10,000pF = .01uF