... | ... | @@ -4,12 +4,11 @@ |
|
|
|
|
|
## Create and study BOM, powerlist and netlist
|
|
|
|
|
|
1. Use as few different components as possible
|
|
|
1. Use as few different components as possible.
|
|
|
- A single BOM line is costing roughly 100-200 CHF (ordering,
|
|
|
putting roll on machine etc.) and you will save time for
|
|
|
yourself
|
|
|
(checking BOM, ordering) and will also have less chances of
|
|
|
mounting the wrong components.
|
|
|
yourself (checking BOM, ordering).
|
|
|
It will also reduce the risk of mounting the wrong components.
|
|
|
- Print the BOM, check the resistor values used and see if you can
|
|
|
remove some values by putting them in parallel or series (or
|
|
|
actually taking existing values that are as good).
|
... | ... | @@ -30,11 +29,11 @@ |
|
|
4. For any newly created symbols, check the pin numbering.
|
|
|
- CERN specific: check if only symbols created by the design
|
|
|
office are used.
|
|
|
5. Verify that the BOM is describing fully the components used
|
|
|
5. Verify that the BOM is describing fully the components used.
|
|
|
- Manufacturer, Manufacturer full ordering number (including
|
|
|
package and speed): e.g., LINEAR TECHNOLOGY LT1931ES5\#TRMPBF
|
|
|
package and speed): e.g., LINEAR TECHNOLOGY LT1931ES5\#TRMPBF.
|
|
|
- For generic components: all parameters are defined in the
|
|
|
symbol: e.g., GENERIC R0603\_220R\_1%\_0.1W\_100PPM)
|
|
|
symbol: e.g., GENERIC R0603\_220R\_1%\_0.1W\_100PPM.
|
|
|
- [Example
|
|
|
BOM](https://edms.cern.ch/ui/file/1165461/1/EDA-02063-V5-0_pcb-mat.pdf)
|
|
|
6. Verify that the BOM is completely generated out of the schematics.
|
... | ... | @@ -138,5 +137,5 @@ |
|
|
|
|
|
-----
|
|
|
|
|
|
Erik van der Bij - 1 March 2018
|
|
|
Erik van der Bij - 23 July 2018
|
|
|
|