Standards - Schematic

Template

All schematic sheets shall use Midnight Sun templates. The title block shall be populated using the relevant sheet parameters.

Component Source

All components used shall be from the team’s A365 library. No components shall be from the Altium content vault, a local library, or any other source.

Style

Grid

All schematics shall be drawn exclusively on a 100 mil grid for neatness. I will be sad if you use a 50 mil grid.

Power Net Naming

Use minimum number of significant digits, always include “V” where the decimal point would go.

Negative nets are prefixed with “N”, positive nets have no prefix.

Ex: 12V, 5V, 3V3, N2V1, 131V

SPI Net Naming

Different manufacturers use many different names for SPI signals. We use MOSI, MISO, SCK, and NSS. This follows STM32 datasheets.

Port Placement

Power ports should always face up (like the letter T), and ground ports should always face down.

Connectors

Below is an overview of the connectors in use.

JST-GH

Starting with MS16 controller boards, we will be moving to the JST-GH series. They are used instead of Microfit due to the size constraints present on the controller board, and wide availability of harnesses and pre-crimped cables. GH Connector | JST Sales America

Molex DuraClick (Deprecated)

Duraclick connectors were used for CAN on controller boards up to MS15. DuraClik Connectors | Molex

Molex Microfit

Use for all board to wire connections other than for CAN. Generally the vertical type is used as is it easier to access. Micro-Fit Connectors | Molex

NGFF B-Key

Starting for MS16, the controller board interface will be the M.2 B-Key interface, with > 2.4mm standoff height between the controller and host boards.

Mezzanine (Deprecated)

For MS15, the controller board interface used 60 pin 0.5mm pitch mezzanine connectors.

Decoupling

IC decoupling shall be achieved by a minimum of one 0.1uF MLCC capacitor per power pin. Additional decoupling shall be added if warranted by the application, such as in high power devices. The datasheet will generally have recommended decoupling schemes. It is acceptable to round decoupling cap values to nicer numbers, ie 0.47uF to 1uF. Be weary of excessive capacitance resulting in inrush current.

Thermistors

The standard thermistor has a 10k value and is situated on the low side.