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April 11, 2025 - GREAT UNION HOLDINGS, a leading international distributor of semiconductor components for the Asia Pacific market, announced that its subsidiary, Shiping, has launched an automotive 12V BMS application solution based on a wide range of high-performance chips from NXP, with peripheral devices from Molex, onsemi, Vishay, as well as products from Ensign Semiconductors and Sanborn Microelectronics. Automotive 12V BMS application solutions.

Board diagram of an automotive 12V BMS solution with NXP products as the core.

As the core of modern automotive battery technology, BMS is able to monitor battery voltage and current in real time, accurately assess the state of charge, and help users rationally arrange battery usage. At the same time, the BMS system can optimise the charging and discharging process to improve battery efficiency and reduce energy loss. And through balanced management of the charging status of each individual battery in the battery pack, the BMS can effectively prevent over-charging or under-charging, thus prolonging the overall life of the battery. In order to promote the application of BMS system, GRECO introduced NXP S32K312 MCU, MC33772C battery control IC, FS2303B SBC chip, TJA1443AT CAN chip, PCA85073A clock chip as the core, integrated Molex 5600201020 connector, onsemi NV24C64LV EEPROM, Vishay WSLP5931 high-power resistors, as well as onsemi BUK7S0R5-40H MOSFET and SGM8752-1Q comparator of Shengbang Microelectronics for automotive 12V BMS applications.

The S32K312 is part of NXP's S32K3 family of automotive general-purpose microcontrollers. Based on the ARM Cortex-M7 core and supporting single, dual and lock-step core configurations, the S32K3 series offers scalability in terms of number of cores, memories and peripherals, compliance with ISO26262 standards, advanced functional safety, information security and low power consumption, making it suitable for bodywork, area control and electrification applications in harsh operating environments.

The MC33772C used in the AFE module is NXP's battery control IC designed for automotive and industrial applications, which supports the monitoring and management of up to six strings of batteries. At the same time, the IC is able to differential battery voltage analogue-to-digital conversion, and through up to 256 average level, to ensure high precision measurement. In addition, the MC33772C integrates multiple functions such as current acquisition, coulomb counting, and temperature measurement, enabling comprehensive monitoring and management of battery status.

In terms of power supply, the solution adopts the FS2303B System Basis Chip (SBC). The chip has unique design and performance advantages, and can meet the latest generation of automotive electronic control units (ECUs) on the system stability and safety of the stringent requirements, and fully adapted to its system and safety features. In addition to providing a stable power supply, the FS2303B also integrates CAN transceiver, LIN transceiver, high side driver and functional safety modules. Through the one-time programmable memory (OTP), users can enable specific functions to meet the needs of diverse automotive applications. In addition, the chip is highly flexible, offering a wide range of device versions in terms of output voltage settings, operating frequency, power-up sequence, and input/output configurations, making it a flexible fit for a variety of application scenarios.

The PCA85073A is a CMOS1 real-time clock optimised for low power consumption, which can be fine-tuned via an offset register for more accurate timing and calibration.

In addition, the solution also adopts the TJA1443AT CAN transceiver, which helps to achieve efficient and reliable in-vehicle network communication, ensuring real-time data transmission and processing for the battery management system.

This automotive 12V BMS solution is designed for 12V battery modules, and can internally detect modules consisting of 4 strings of batteries with a total voltage of 12V (depending on the actual battery parameters). The solution is equipped with 4 voltage acquisition channels and 5 temperature acquisition channels (2 on-board and 3 external to collect the temperature inside the battery pack). In addition, the BMS solution supports hardware charging and discharging protection, diagnostic information reporting, SOC estimation and passive equalisation, which can effectively guarantee the safety and reliability of the battery.

Core technology advantages:

Supports 4-channel battery, single battery voltage sampling, over-voltage and under-voltage threshold alarm can be set;

Support charging and discharging road control, current acquisition, hardware overcurrent protection;

Support 5-channel temperature acquisition channel (2-channel on-board, 3-channel external acquisition of temperature inside the battery pack);

Supports SOC estimation, diagnostic information reporting, and disconnection detection;

Conforms to ASIL-B safety level;

On-board RTC IC, EEPROM and other slave devices.

Programme specifications:

Single battery voltage sampling cycle within 100ms, battery cluster current sampling cycle 50ms, battery single temperature sampling cycle 1s;

Support 4-channel battery over-voltage and under-voltage alarm, threshold can be set (default: over-voltage 3.65V, under-voltage 2.5V);

Hardware overcurrent and short-circuit current 1500A protection;

Support continuous operating current 60A (3C), 259A (full temperature range rated current), 580A (full temperature range transient current within 5s);

Current collection accuracy reaches 2% (<200A, national standard), 1% (≥200A, national standard);

Voltage acquisition accuracy reaches ±2mV;

Support passive equalisation, maximum support 300mA equalisation current;

The cumulative error of SOC estimation is less than 5%, in line with the national standard;

Support battery high and low temperature alarm, threshold can be set (default: high temperature 70℃, low temperature -20℃).