Smart Battery Management for Mobile Robotics 7-14 Cells

MR-BMS771

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The MR-BMS771 is a standalone battery management system (BMS) reference design suitable for mobile robotics, such as drones and rovers, supporting 7- to 14-cell batteries.

The design is suitable 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 MR-BMS771 features a 7- to 14-cell voltage measurement, pack voltage measurement and output voltage measurement, as well as current sensing (coulomb counting), 1 to 3 possible cell temperature sensors and power switch. Other features include 2 controller area network (CAN) buses, inter-integrated circuit (I²C), display, near-field communication (NFC), universal asynchronous receiver-transmitter (UART) 12 V 1 A 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).

Easily make your own control algorithms with Model-Based Design Toolbox (MBDT) in MATLAB SimuLink.

Block Diagram

MR-BMS771

MR-BMS771 Block Diagram
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Supported Devices

Processors and Microcontrollers

S32K Auto General-Purpose MCUs

  • S32K1: S32K1 Microcontrollers for Automotive General Purpose

Battery Management

Battery Cell Controllers

  • MC33771C: 14-Channel Li-Ion Battery Cell Controller IC

Security and Authentication

Authentication

  • SE051: EdgeLock® SE051: Proven, Easy-to-Use IoT Security Solution with Support for Updatability and Custom Applets

RFID

Connected NFC Tags

  • NTAG5-BOOST: NTAG® 5 Boost: NFC Forum-Compliant I²C Bridge for Tiny Devices

Interfaces

CAN Signal Improvement

  • TJA1463: CAN Signal Improvement Capability Transceiver with Sleep Mode

Features

Flexibility

  • MCU-based solution with 7- to 14-cell batteries, with stack voltage ranging from 15 V to 59 V

External 12 V

  • 12 V 1 A output with over current protection (OCP)

Battery Self-Management

  • Performs accurate battery-stack and cell-voltage measurements as well as accurate battery charge or discharge current measurements and up to 30 A DC tested

Cell Balancing

  • Operates cell balancing during charging

Low Power Modes

  • Offers a deep sleep mode (for transportation and storage) with very low leakage current, as well as an automatic sleep mode with low current consumption on the battery

Safety

  • Allows diagnostics to verify the safe operation of the battery

Diverse Connection Types

  • Two CAN buses are available on the board of which 1 CAN signal improvement capability (SIC) up to 8 Mbit/s
  • An I²C interface is implemented on the board and can also be used as a system management bus (SMBus)
  • An external organic light-emitting diode (OLED) display connected via I²C is provided with the MR-BMS771 kit

NTAG 5 Boost

  • The NTAG 5 boost is optional on the MR-BMS771 board and it also allows the user to acquire data and configure the board through NFC

Printed circuit board (PCB) Antenna

  • An NFC antenna is built on the PCB and it allows short-range NFC communication with a smartphone

External Antenna

  • For extended-range NFC communication, it is possible to connect an NFC antenna as a replacement for the PCB antenna

Secure Element

  • The integrated secure element EdgeLock® SE051C delivers proven security certified to Common Criteria (CC) Evaluation Assurance Level (EAL) 6+, with AVA_VAN.5 up to the OS level for strong protection against the most recent attack scenarios

SWD and JTAG

  • Both serial wire debug (SWD) and Joint Test Action Group (JTAG) debugging interfaces are available on the MR-BMS771 design. They work with standard J-Link as well as other debuggers

Dronecode Debug-Landzo (DCD-LZ)

  • DCD-LZ is a combined debug console interface for use with PX4 DroneCode and HoverGames platforms

S32K146

  • Automotive grade— Automotive Electronics Council (AEC)-Q100—qualified, 32-bit Arm® Cortex®-M4F-based microcontroller (MC)
  • 1 MB Flash, 128 K static random-access memory (SRAM), 80 MHz @ RUN mode 112 MHz @ High-Speed RUN (HSRUN) mode, -40 °C to +105 °C/+125 °C, 64/100/144 low-profile quad flat package (LQFP), 100 molded array process ball grid array (MAPBGA)
  • International Organization for Standardization (ISO) CAN flexible data-rate (FD), Cryptographic Services Engine – enhanced (CSEc) hardware security, Automotive Safety Integrity Level (ASIL) B ISO26262 functional safety, ultra-low power performance

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MR-BMS771
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Smart Battery Management for Mobile Robotics 7-14 Cells.

    $223.25 USD
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    • Application Example Software

      NuttX RTOS C-Based BMS example for RDDRONE-BMS772

      GITHUBRev 6.1May 5, 2025 13:15:00NUTTX-RTOS-C-BASED-BMS-FOR-RDDRONE-BMS772
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    • Application Example Software

      NuttX RTOS C-Based BMS example for MR-BMS771

      GITHUBRev 7.2Jun 30, 2025 12:57:00NUTTX-RTOS C-BASED
      Download
    • Application Example Software

      MBDT Toolbox S32K1xx 4.3.3 Patch

      GITHUBRev 4.3May 5, 2025 12:32:00MBDT-TOOLBOX-S32K1XX-4.3.3-PATCH
      Download

    Note: For better experience, software downloads are recommended on desktop.

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