# BMS772 Smart Battery

## What is this board?

The RDDRONE-BMS772 is a standalone BMS reference design suitable for mobile robotics such as drones and rovers, supporting 3 to 6 cell batteries.

* Also 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.
* Higher voltage cell count applications can rework this reference to daisy chain BCC chips.
* An S32K144 General Purpose MCU provides great flexibility and communication to a PX4 based FMU via UAVCAN or I2C/SMBus.

## List of Technologies & Specifications

**Flexibility** - Supports 3-6 cell batteries, with stack voltage ranging from 6 V to 26 V.

**Measurements** - Performs accurate battery stack and cell voltage measurements as well as accurate battery charge or discharge current measurements, up to 90 A DC.

**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.

**CAN** - Two CAN connectors are available on the board. The board is also compatible with UAVCAN to work with PX4 flight controllers.

#### I2C:

* An I2C interface is implemented on the board and can also be used as an SMBus.
* An external OLED display connected via I2C is provided with RDDRONE-BMS772 kit from rev. 4.0.

**NTAG 5 boost** - The new NTAG 5 boost is embedded on the RDDRONE-BMS772 board. It also allows the user to acquire data and configure the board through NFC.

**PCB antenna** - An NFC antenna is built on the PCB. It allows short-range NFC communication with a smartphone.

**External antenna** - For extended-range NFC communication, it is possible to install an additional coil as a replacement for the PCB antenna.

#### A1007:

* The brand new A1007 Secure Authenticator allows you to build a secure anti-tamper system using elliptic curve cryptography.
* Secure flags and counters can be used for cycle counts and under-voltage over temperature permanent flagging.

**SWD and JTAG** - Both SWD and JTAG debugging interfaces are available on the RDDRONE-BMS772 design. They work with standard J-Link as well as other debuggers.

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

#### S32K144:

* Automotive grade (AEC-Q100 qualified), 32-bit Arm® Cortex®-M4F-based MCU
* 512 KB Flash, 64 K SRAM, 80 MHz @ RUN mode (112 MHz @ HSRUN mode), -40 oC to +105 oC / +125 oC, 48/64/100 LQFP, 100 MAPBGA
* ISO CAN FD, CSEc hardware security, ASIL-B ISO26262 functional safety, ultra-low power performance

## Links

* NXP link to the product webpage:

{% embed url="<https://www.nxp.com/design/designs/smart-battery-management-for-mobile-robotics:RDDRONE-BMS772>" %}

* Design Files link:

{% embed url="<https://www.nxp.com/design/designs/smart-battery-management-for-mobile-robotics:RDDRONE-BMS772#design-resources>" %}

* GitBook link:

{% embed url="<https://nxp.gitbook.io/rddrone-bms772/>" %}