Matek AP_PERIPH CAN Digital Power Monitor
by Matek Systems

Matek AP_PERIPH CAN Digital Power Monitor

• CAN-L4-BM is a ultra-precise digital power monitor based on TI INA239 & ArudPilot AP_Periph firmware.
• The resistance of this conductive path is 200 μΩ typical, providing low power loss in the application.
• With this device, No calibration required,  flight controller that support DroneCAN protocol can easily get accurate current & bus voltage readouts via CAN bus.

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
  • UART2, 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

• Physical
  • Board Size: 30mm*22mm*3mm.  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)

Packing

• 1x CAN-L4-BM board
• 1x JST-GH-4P to JST-GH-4P 20cm silicon wire

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.