NXP BMA7118: ASIL D Battery Cell Controller with High Sync, Dedicated ADC per Channel

Fact Sheet

The BMA7118 is an Automotive Li-ion battery cell controller IC designed for dedicated, high-accuracy ADC per voltage measurement channel with high synchronization capability, essential for Equivalent Impedance Spectroscopy (EIS). This product family approach ensures pin compatibility and allows for software reuse, enabling cost-effective upgrades to EIS. The BMA7118 boasts low 5 mA current consumption, attributed to its integrated DC-to-DC converter. Its fully redundant and independent internal architecture achieves ASIL D Functional Safety.

Key Features

Supports 8 to 18 cells per device.
Features a dedicated, high-accuracy ADC per cell voltage measurement channel with high synchronization capability required for EIS.
Offers a typical ±0.8 mV measurement error with ultra-low long-term drift.
Provides ISO 26262 ASIL D support for cell voltage and temperature measurements.
Includes passive cell balancing with 300mA capability (timer/voltage/ PWM).
Supports external temperature and auxiliary voltage measurements.
Enables isolated daisy chain communication for up to 62 nodes or SPI communication.
Provides diagnostics (redundant comparison primary and secondary) and robustness.
Results in low external Bill of Materials (BOM) cost.

Target Applications

Automotive:

Electric vehicle high voltage battery management
Electric vehicle 48 V battery management

Industrial:

Utility ESS (Energy Storage Systems)
Commercial ESS
Residential ESS
Micromobility
eBike/eScooter

Main Application Block Diagram

The block diagram illustrates the primary and secondary measurement systems, digital processing units, event handling, gate drive control, and communication interfaces. Key components include multiple ADCs for cell voltage and temperature measurements, a primary and secondary register map, a monitoring unit, and an event handler. The diagram also shows the integration of a DC-to-DC converter (BUCK converter) for power management, along with various GPIO pins that can be configured for analog input or digital functions. Communication interfaces like SPI and TPL modem are also depicted, highlighting the system's connectivity and control capabilities.

Orderable Samples

Part Number	Temp Range	Other Features	Other Features	Package
MBMA7118TA1AE	-40° C - 125° C	TPL	9 GPIO	QLFP 64 Pin
MBMA7118SAIAE	-40° C - 125° C	SPI	9 GPIO	QLFP 64 Pin

For more information, visit nxp.com/BMA7118.

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