*** Hellen One: Hellen72 Frame specs (DRAFT) ***

General info: https://rusefi.com/s/hellen72/

EDA Software: Altium Designer

Board/connector footprints source: <.../hw_72_nb>

Pinout spreadsheet: <...>

Modules:
  - mcu/0.1
  - input/0.1
  - output/0.1
  - power5/0.1
  - power12/0.1
  - can/0.1
  - lin/0.1
  - ign8/0.1
  - sd/0.1
  - stlink/0.1
  - knock/0.1

- Additional components:
  - USB-B vertical TH: TE 5787834-1
  - "PROG" button
  - "RESET" button
  - Accelerometer
  - MAP sensor: MPX4250AP
  - SD-Card module connector: <SD-CARD module info>
  - "Extension port" connector: 
    - UART
    - SPI
    - IO1-IO4
    - +3.3V, +5V, +12V, GND

- Board configuration:
  - Jumper resistors for pins:
    - 3L = IN_AFR or OUT_IGN7
    - 3Z = GNDA or OUT_IGN5
    - 4K = V5A or OUT_IGN6
    - 4U = IN_MAP2 or OUT_IGN8
    - IN_VIGN = 4S or 4T
  - Standard input pullups (V5A): 
    - RES1, RES2
    - AUX1, AUX2, AUX3, AUX4
    - TPS, PPS, O2S, O2S2, IAT, CLT
    - CRANK, CAM, VSS
    - SENS3 (FUEL_LEVEL)
  - Standard input pulldowns (GNDA): 
    - MAP1, MAP2, MAP3, MAP4
    - KNOCK
    - SENS1, SENS2, SENS4
  - Additional pulldowns (GNDA):
    - IN_MAF (1k)

- Additional LEDS:
  - IGN1-IGN8 (to GND)
  - INJ1-INJ8 (to +12V, protected)
  - AC, PUMP, IDLE, ECF, VVT, O2H, O2H2, CE, ALT_WARN, MAIN, CANIST (to +12V, protected)
  - TACH, ALTERN, VIGN (to GND, protected)
  - CRANK, CAM, VSS (to +5V, protected)
  - +5V, +3.3V
  - Jumper resistors for LEDS: VSS, CAM, CRANK

- Additional TEST PADS:
  - +12V
  - +5V
  - +3.3V
  - GND

- Silkscreen:
  - silkscreen/board orientation - the ECU connector is at the top
  - all pins named (both sides)
  - https://rusefi.com/s/hellen72/
  - "for notes" area 50x20 mm

- Special layout requirements:
  - SD-Card should be 10-20 mm away from other components
  - MPX4250 hose output opposite to the ECU connector