NXP Semiconductors MC33772BSA1AE

Overview

MC33772BSA1AE from NXP is a six-cell battery monitor IC with integrated current sensing, coulomb counting, and 48-pin LQFP packaging. It performs synchronized differential cell voltage (up to 6 cells), stack voltage, current, temperature (7 inputs), and impedance measurements with 113 µs timing alignment. It enables ASIL D–compliant BMS for automotive high-voltage packs (200–800 V) and 14 V Li-ion systems.

For engineers reviewing the MC33772BSA1AE datasheet, MC33772BSA1AE pinout, MC33772BSA1AE application, or MC33772BSA1AE equivalent, key selection criteria include its 2 Mbps isolated daisy-chain communication, onboard 300 mA passive balancing MOSFETs with diagnostics, ISO 26262 functional safety support, and compatibility with both SPI (4 Mbps) and transformer physical layer (TPL) interfaces.

Technical Context

The MC33772BSA1AE integrates an analog front end with six differential cell voltage inputs, one current-sense channel (ISENSE±), seven ADC-configurable GPIO/temperature inputs, and on-die coulomb counter. Its measurement engine synchronizes cell voltage sampling and current integration at 113 µs intervals to enable single-shot impedance calculation.

It supports two isolated communication modes: 2 Mbps differential TPL (with MC33664 transformer driver) or 4 Mbps SPI, both addressable at initialization. The device operates from 5.0 V to 30 V VPWR (42 V transient tolerant for TPL), includes low-power modes, and delivers fault reporting via dedicated FAULT pin and register flags.

Key Specifications

Pinout & Package

MC33772BSA1AE is housed in a 48-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per NXP MC33772FSA4 REV 4 datasheet and schematic reference design.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar battery monitor applications.

Compared with BQ7695200RSMR and MAX17853GCM+, the MC33772BSA1AE uniquely combines integrated current sensing, coulomb counting, and TPL/SPI dual-mode communication in a single ASIL D–ready package-enabling faster impedance-based diagnostics and lower BOM count in 6-cell automotive and industrial BMS.

Availability

MC33772BSA1AE is available at Aetrix Electronics and suitable for automotive high-voltage battery management systems, 14 V Li-ion auxiliary power supplies, and industrial energy storage systems requiring stable component supply, long lifecycle support, and functional safety compliance.

Supply support for MC33772BSA1AE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The MC33772BSA1AE belongs to NXP's SafeAssure® battery monitor product line, engineered specifically for ASIL D–compliant BMS implementations in electric vehicles and mission-critical energy storage, with emphasis on integrated safety diagnostics and communication robustness.

FAQ

What communication protocols does the MC33772BSA1AE support?

The MC33772BSA1AE supports two isolated communication modes: 2 Mbps transformer physical layer (TPL) using differential signaling with MC33664, and 4 Mbps SPI. Both interfaces operate in daisy-chain topology and are addressable at initialization. TPL mode enables CAN-replacement architectures, while SPI mode simplifies integration with existing microcontroller peripherals. The MC33772BSA1AE does not support I²C or UART natively.

Does the MC33772BSA1AE include integrated current sensing and coulomb counting?

Yes, the MC33772BSA1AE integrates a bidirectional current-sense channel (ISENSE±) and on-die coulomb counter. Current measurements are synchronized with cell voltage sampling at 113 µs intervals, enabling single-shot impedance calculation. This eliminates the need for external current-sense amplifiers and firmware-based integration, reducing BOM and improving SoC/SoH accuracy in the MC33772BSA1AE-based design.

What safety certifications apply to the MC33772BSA1AE?

The MC33772BSA1AE is designed to support ISO 26262 up to ASIL D, with built-in functional verification for ADC precision, current path integrity, cell terminal opening/leakage, and balancing MOSFET diagnostics. It includes SafeAssure® safety documentation, FMEDA reports, and diagnostic coverage analysis. Certification is achieved at the system level; the MC33772BSA1AE provides the necessary hardware mechanisms to meet ASIL D requirements when implemented per NXP's safety manual.

Can the MC33772BSA1AE monitor fewer than six cells?

Yes, the MC33772BSA1AE supports 3-cell to 6-cell configurations. Unused cell inputs (e.g., CT4–CT6 in a 3-cell setup) are left unconnected or tied to appropriate reference points per layout guidelines. The device automatically adapts measurement sequencing and balancing control to the active cell count. This flexibility allows reuse of the MC33772BSA1AE across multiple pack architectures without redesign.

What is the purpose of the CB6.5_C pin on the MC33772BSA1AE?

The CB6.5_C pin on the MC33772BSA1AE enables passive balancing on the top cell (cell 6) in a 6-cell stack when used with an external balancing resistor network. It provides a dedicated control signal that complements CB6, allowing independent activation of balancing for the highest-potential cell. This improves balancing efficiency and thermal distribution in high-voltage configurations, and is a defined function in the MC33772BSA1AE pinout per NXP MC33772FSA4 REV 4.