mega mcu is part of the second generation of hellen ECU modules. mega mcu consists of what what previously done separately:

• mcu
• input module
• ignition module with LEDs
• CAN transceiver
• reset & PROG/DFU buttons
• SD card
• 3.3 reference voltage for WBO modules (WBO modules NOT part of mega)
• baro & accelerometer sensors

Power Management

OUT_PWR_EN with pulldown. Logic high enables:

• V33_SWITCHABLE;
• V5A_SWITCHABLE;
• uSD card;
• input submodule: OpAmps, multiplexer, pullups;
• TLS115 protected 5V output if connected to power 12 and 5 module.

schematics 0.2

schematics 0.1

Changelog

0.5

CAN wake-up fix

0.4

analog inputs bug FIXED

0.3

power supply: sleep mode fixes

analog inputs bug ADDED

0.2

Power supply architecture update

0.1

It's alive and it's compact!