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Specifications

• MCU: STM32L431xC, 256KB Flash
  
• INA239 85-V, 16-Bit, High-Precision Power monitor IC With SPI Interface
  
• Battery Voltage sense input: 0~85V
  
• Current Sense Range: 0~204.8A
  
• Load current on current sensing resistor: 150A(Continuous), 204.8A(Burst)
  
• Voltage accuracy: ± 0.1%
  
• Current accuracy: ± 2%
  
• Interface: CAN, DroneCAN Protocol, U-ART2, spare, DFU, -ST debug, SWCLK & SWDIO
  
• LED: Blue, (Fast blinking, Booting), Blue, (Slow blinking, working) Red, (3.3V indicator)
  
• Power supply for CAN-L4-BM board: 4.5~5.5V @5V pad/pin
  
• Power consumption: 10mA
• Operating Temperatures: -40~85 °C
  Board Size: 30mm x 22mm x 3mm.
• Weight: 4g
  
• 3D file: CAN-L4-BM_STEP.zip
• Firmware: ArduPilot AP_Periph  MatekL431-BattMon
•  Update: via DroneCAN GUI Tool
  
• Parameters: CAN_P1_DRIVER = 1 if attached to CAN bus1 port or CAN_P2_DRIVER = 1 if attached to CAN bus2 port, BATTx_MONITOR = 8 (DroneCAN-BatteryInfo)
  

Tips

• The big pad on the bottom side is a dead pad. No any circuit network on it.
• Solder the positive wires as close as possible to both sides of the current sensing resistor.
• 2 ears for mounting can be cut off if you don’t need it.
• If the CAN wires are too long, bridge the “120R” jumper.

Includes

• 1x Matek AP_Periph CAN-L4-BM Digital Power Monitor
• 1x JST-GH-4P to JST-GH-4P 20cm silicon wire

Wiring Diagram