matek ap periph can l4 bm digital power monitor
matek ap periph can l4 bm digital power monitor
matek ap periph can l4 bm power monitor
matek ap periph can l4 bm

NewMatek AP_Periph CAN-L4-BM Digital Power Monitor

About Matek AP_Periph CAN-L4-BM CAN Digital Power Monitor

The Matek AP_Periph CAN-L4-BM CAN Digital Power Monitor offers ultra-precise monitoring for your 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.

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matek ap periph can l4 bm digital power monitor
CAN L4 BM
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Top highlights
Built with TI INA239 and STM32L431 running ArduPilot AP_Periph firmware, it delivers accurate real-time voltage and current data over CAN without analog calibration.
Supports up to 0–85V input voltage and 0–204.8A current sensing (approx. 150A continuous), suitable for FPV, multirotor, and medium-to-large UAV power systems.
Uses DroneCAN protocol for direct communication with flight controllers, ensuring stable data transmission with strong anti-interference performance.
Features ultra-low resistance (approx. 200μΩ) current path design, with voltage accuracy of ±0.1% and current accuracy of ±2% for professional-grade telemetry.
Ultra-compact size (approx. 30×22×3mm) and only ~4g weight. Powered by 5V (4.5–5.5V range) with DFU firmware upgrade support for ArduPilot ecosystems.
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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.


CAN L4 BM Wiring 1

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

● 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)


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