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QuestionOutcome

UART/USB? If we use USB, may need serial-to-usb converters on-board (In-car debugging)

UART only (Serial-to-USB converters are cheap), we can reprogram our ST-Link V2 Clones to receive UART

Daisy chaining 12V power or not (LV power granularity)No daisy chaining, 12V power from carrier only
Hermaphroditic board-to-board connectors or notNon-hermaphroditic bergstak connectors

Switching regulator circuit or integrated DC-DC converter (board complexity, cost)

Switching regulator circuit due to price and component height

LQFP vs UFQFPN

LQFP for ease of routingrework

How many pins do we dedicate to 3.3V, 12V, and GND on the mezzanine?

Currently evaluating

3.3V: 6 pins
VBAT: 4 pins

GND: 8 pins


These were determined based on the number of pins we have left from using all the GPIOs. Ground was chosen to be on both sides to ensure a good connection. 

0.5mm or 0.8mm pitch mezzanine connectors?Evaluating (0.8mm is much more expensive)5 mm 

Key Components

Part
Info
Digikey Link
STM32F072CBT6

ARM Cortex-M0

Includes CAN controller, 37 IOs, 48-LQFP

497-14645-ND

TCAN332DR

CAN Transceiver

Replacement for the SN65HVD232DR

296-43711-1-ND

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