| Electronics > Beginners |
| Modern way to specify values on schematics |
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| Gyro:
It's best to stick with engineering number format too, ie. powers of 3. That way you never see 0.1u, it's always 100n. Personally, I much prefer 4k7 over 4.7k, It's less susceptible to lost dots and bad eyesight. I use the same in speech too. |
| T3sl4co1l:
There may be some confusion over m/M. Meg is preferred in that case. The typical example is SPICE, which is case insensitive, so 'M' always means milli. 'MEG' means mega, or you can use a multiplier instead ('1e6'). If you're doing a full design (schematic capture, simulation and BOM) you'll probably need to do this. Tim |
| AndyC_772:
--- Quote from: Benta on March 03, 2019, 06:33:40 pm ---For a schematic, I only use the reference, eg, R1, R5, C2, U3 etc. For a PCB layout I do the same thing. I place the component values in the "mouse-over" component description / note / comment field in the design files (schematic and PCB both). This gives you a nice clean schematic that's easy to read, and with a click or mouse-over on the component provides additional information. Full information (such as supplier etc.) is in the BOM. --- End quote --- Component values are essential information, they need to be shown always. Missing them out doesn't remove clutter, it obfuscates the function of the circuit. Hidden power pins are the same: just say 'no'. I tend to relegate the tolerance and dielectric to the BoM, but even they're shown on the schematic if they're at all unusual. Ask yourself this: does a printout of this schematic tell me everything I need to debug the circuit? |
| T3sl4co1l:
A catch about power pins: in some tools, these connect or hide automatically (between different parts of a multipart component). Others, you have to hide them manually. Or there's the method of using a separate power supply part. In any case, don't scatter multipart components across multiple sheets, keep them local, and place the supplies nearby. Tim |
| dmills:
Good advice until you hit the 600+ ball FPGA sort of part, where a few sheets for the power, one for the DDR IO bank, one for the network, a couple for the serdes starts to make a lot of sense. You really cannot do a sane schematic with a part with that many connections without carving the thing up into multiple IO banks so that the schematic breaks down by function. Regards, Dan. |
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