Glasgow Embedded / Glasgow - History

revC2: center the vias to GND for the TVS diode arrays

revC2: fix distance between port headers to multiple of 2.54 mm

It was off by 0.1 mm before, thanks to user disasm for spotting this.

A raster of 2.54 mm is desirable for compatibility to other 2.54 mm
equipment like protoboards. Also designing addon boards is simplified
by allowing to use an imperial grid in CAD.

Also update the dimension drawings. Align the dimension drawings to
the location of pin 1 instead of the connector center, as Kicad library
connectors have their origin on pin 1 and not at the center.

revC2: Updated Molex KK 3D Model.

The previouos WRL model was not exporting to STEP for some reason. :(

revC2: Minor silkscreen work. Added tact switch 3d model.

revC2: Moved sync connector to increase separation.

This will allow us to create a web between the main connector and sync
connector in the top side of the case.

revC2: Bigger footprint bulk cap and reset button.

Details:
* Replaced the bulk capacitance polymer capacitor with a larger
footprint version as the 6.3mm footprint is more common.
* Added a reset button that instantly resets the cirucuit. Meant also as
emergency stop. Reset will result in cutting power to the target instantly.
* To enable reset we replaced the power supervisor chip with one that
has a reset pin.
* As the pullup current of the supervisor chip reset line is very low,
we have added a capacitor parallel to the tact switch, to improve
"wetting current" and break down contact oxides.
* To make space for the reset button I decided to replace the SO8
EEPROMs with TSSOP-8 packaged versions.
* While already moving things arouond I increased the gaps between the
status LEDs from 1.75mm to round 2.00mm. This should make lightpiping
easier when we design a case for the glasgow.

revC2: Switched bulk cap footprint, Added system reset button circuit.

revC2: Switched eeprom packages to TSSOP-8 to gain more space.

revC2: Adjusted minimum drill distance down to 0.15mm.