MC33771BSA2AER2

Overview

The MC33771BSA2AER2 is a 14-channel Li-Ion battery cell controller IC designed for automotive and industrial applications. It features ADC conversions on differential cell voltages and currents, coulomb counting, and temperature measurements. The device supports standard SPI and transformer isolated daisy chain communication with an MCU. It includes embedded balancing transistors and diagnostics to simplify applications. The supply voltage range is 9.6 V to 61.6 V with 75 V transient capability. It is compliant with MPC5xxx 32-bit MCU families.

Feature Summary

• Supports synchronized advanced current measurement with integrated current sensor and PGA offering ±0.5% accuracy from milliamps to kiloamps.
• Features onboard passive balancing with 300mA low Rdson MOSFETs and programmable balancing timers for each channel.
• Provides isolated daisy chain or SPI communication interfaces for data processing and control with microcontrollers.

Applications

• Hybrid Electric Vehicles (HEV)
• Electric Vehicles (EV)
• Energy Storage Systems (ESS)
• Uninterruptible Power Supply (UPS) systems

Procurement Notes

Verify the specific suffix 'BSA2AER2' against official NXP documentation to confirm it corresponds to the MC33771B variant with AEC-Q100 qualification and LQFP-EP-64 packaging. Ensure the ordering code matches the required communication interface and safety level specifications before procurement.

Selection Notes

Select this component for high-voltage battery management systems requiring up to 14 channels of cell monitoring. It is suitable for designs needing ISO 26262 ASIL D compliance and hot-plug capabilities. Consider the MC33771C variant if ring-back support or higher node counts in daisy chains are required instead of transformer isolation.

Part Context

The MC33771 series serves as a primary cell controller for lithium-ion battery packs in demanding environments. It integrates voltage, current, and temperature sensing with balancing functions. The device is part of NXP's SafeAssure program, ensuring long-term product availability for critical automotive and industrial infrastructure projects.

Replacement Considerations

The MC33771C offers similar functionality but supports capacitor/inductor coupling and ring-back in daisy chains. The MC33772 series provides fewer channels (3-6) with lower voltage ranges. Verify pinout and register compatibility when substituting.

FAQ

Does the MC33771 support average sampling for voltage measurements?

No, the MC33771B variant does not support average sampling. This feature is available in the MC33771C variant which averages up to 256 samples.

What is the maximum number of nodes supported in a daisy chain configuration?

The MC33771B supports up to 15 nodes in a transformer-isolated daisy chain configuration.