Introduction
One of the biggest issues with MSXI's electrical system was its inconsistency in parts and pinouts. There were at least 3 variations of the CAN controller/transceiver circuit and which SPI bus they were connected to, making debugging difficult. Some used different footprints, while others used different parts. This also made inventory a challenge, as each board had its own very specific set of components.
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- UART/USB? If we use USB, may need serial-to-usb converters on-board (In-car debugging)
- Daisy-chaining power or not (LV Power granularity)
- Hermaphroditic or not (Cost)
- Switching regulator circuit or integrated DC-DC converter (board complexity, cost)
Part Selection
| Part | Info | Digikey Link |
|---|
| Price |
|---|
ARM Cortex-M0 |
Includes CAN controller, 51 IOs, 64-LQFP |
TCAN332DR | CAN Transceiver Replacement for the SN65HVD232DR |
External CAN connector
Molex internal wire-to-board surface mount PCB headers
Molex internal wire-to-board connector housings
Molex internal wire-to-board connector crimp terminals
Molex internal wire-to-board surface mount PCB headers
Molex internal wire-to-board connector housings
Molex internal wire-to-board connector crimp terminals
http://www.molex.com/molex/products/datasheet.jsp?part=active/0039014050_CRIMP_HOUSINGS.xml
Mini-Fit Jr
TE internal wire-to-board through hole PCB headers
TE internal wire-to-board surface mount PCB headers
TE internal wire-to-board flat flex cable assembly
TE internal wire-to-board surface mount PCB headers
TE internal wire-to-board connector housings
TE internal wire-to-board connector crimp terminals
Low-profile Micro Mate-N-Lok
Board-to-board IO terminal
Non-hermaphroditic but slightly cheaper
http://www.te.com/usa-en/product-1565357-6.html#pdp-docs-features
Board-to-board IO terminal
Mezzostak Hermaphroditic connectors
Samples from FCI are out of stock, order from Digikey
Board-to-board IO terminal
Samtec LS2 locking hermaphroditic connectors
Samples have been requested
Electrical and mechanical models available
Board-to-board IO terminal
Samtec LSHM high-speed hermaphroditic terminals
Samples have been requested
Electrical and mechanical models available
Not on Digikey, will have to find supplier
LSHM-150-02.5-L-DV-A-S-TR
| Off-board connectors | Used for CAN, power, etc. | TBD | |
| Mezzanine connector | Used to connect the controller board to a carrier board | TBD | |
| Switching regulator | Converts 12v → 3.3v | TBD | |
| LEDs | For debug | TBD | |
| Debug headers | For SWD and UART/USB | TBD |
MCU Schematic Capture
Peripheral Selection
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