Advice needed: "Impedance Control" option at JLCPCB

[ilium007]

Options have changed again at JLCPCB. There is now a seperate Impedance Control option shown below.

It seems an Excel template needs to be added to the Gerber file to process this option.

Selecting +/- 10% is an additional USD$31.43 cost to the project. This option was not there a few months back when I started this project (I have been waiting for parts to come in to stock)

What do I need to select to have these boards built?

[j4cbo]

That's a bummer, there used to be no extra charge :(

I would recommend choosing impedance control... it "might work" without it or it might not, it's a gamble, but if I were ordering more boards $31 would be worth it. The information needed from their template is:

• Signal layer: L1, L4
• Reference layer: L2, L3
• Impedance type: Differential Pair (Coplanar)
• Trace width (mil): 6.2
• Trace spacing (mil): 4.0
• Impedance (ohm): 85

[ilium007]

Do you think L1,L4 can go on one row?

[ilium007]

Or do L1 and L4 need to go in different rows of the spreadsheet?

[j4cbo]

Sorry for the delay here. The meaning should be obvious to them either way - technically there are two controlled-impedance portions (L1 referenced to L2, and L4 referenced to L3) but the specs are the same so either should work.