drone needs. It features a low-power resistant path of 200μΩ, providing high efficiency in power consumption. No calibration is required and DroneCAN protocol offers convenient current & bus voltage readouts. Enjoy precision monitoring and convenience with the AP_Periph CAN CAN-L4-BM.

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.

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