NXP Semiconductors MR-BMS771 Smart Battery Management System (BMS)
NXP Semiconductors MR-BMS771 Smart Battery Management System (BMS) is a standalone BMS reference design suitable for mobile robotics, such as drones and rovers, supporting 7- to 14-cell batteries. The design is also ideal for other applications, such as portable medical devices, high-energy power tools, and personal mobility (wheelchairs/scooters), all of which benefit from high-quality battery control.
The NXP Semiconductors MR-BMS771 features a 7- to 14-cell voltage measurement, pack voltage measurement, output voltage measurement, current sensing (coulomb counting), one to three possible cell temperature sensors, and a power switch. Other features include two controller area network (CAN) buses, inter-integrated circuit (I2C), display, near-field communication (NFC), universal asynchronous receiver-transmitter (UART) 12V/1A output, and secure element.
The S32K146 microcontroller unit (MCU) allows for complete software flexibility and communication via CAN/unmanned aerial vehicle CAN (UAVCAN) or I2C/system management bus (SMBus).
Features
- Supports battery from 7S to 14S, with stack voltage ranging from 15V to 59V
- Measures battery stack and cell voltages, battery charge or discharge current up to 30A DC tested
- Passive cell balancing option over 66Ω balance resistors per cell
- Offers a deep sleep mode (for transportation and storage) with low leakage current, and an automatic sleep mode with low current consumption on the battery
- Allows CAN, I2C, and NFC communication
- Implements serial wire debug (SWD) and joint test action group (JTAG) debugging interfaces, works with standard J-Link and other debuggers
- Implements DCD-LZ combined debug console interface for use with PX4 Dronecode and HoverGames platforms
Applications
- Automotive
- Battery Management Systems (BMS)
- Electric two-wheelers
- Industrial Drone systems
Kit Contents
- Assembled and tested MR-BMS771 in an antistatic bag
- Controller area network (CAN) bus termination resistor (DRONE-CAN-TERM)
- Unmounted cell connectors for 8S to 14S with precrimped wires
- 4-pin JST-GH to 4-pin JST-GH 300mm cable (CAN)
- Power input and power output connectors
- External thermistor with cable
- Small SSD1306 OLED display
- Quick start guide
- Small cell count selector interposer boards (7- to 14-cells)
- NFC antenna
Board Layout
Block Diagram
Related Product
NXP Semiconductors S32K1 32-Bit Automotive General Purpose MCUs
AEC-Q100 qualified 32-bit Arm®-based MCUs for automotive & high-reliability industrial applications.