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The MC33778ASA1AE is a battery junction box controller IC specifically designed for automotive applications such as hybrid electric vehicles (HEV) and electric vehicles (EV), as well as industrial applications (ESS). This chip adopts a serial peripheral interface (SPI) for communication with the MCU.

Core features

Voltage and current monitoring ‌ : Supports differential measurement of battery voltage and current, and realizes coulometer function. ‌ ‌

Temperature measurement ‌ : can detect the battery temperature in real time. ‌

Isolated communication ‌ : Multi-chip cascading is achieved through Daisy chain communication protocol, supporting 14-channel battery monitoring.

Fault protection ‌ : Built-in fault detection mechanisms for overvoltage, undervoltage, overcurrent, etc., and supports fault sign clearance and shielding functions.

Power supply design

Power supply range ‌ : The VPWR pin supports a wide voltage range from 9.6V to 63V, with a maximum withstand voltage of 75V.

Internal voltage ‌ : VCOM is the output voltage of the internal LDO, used for communication and peripheral device power supply, supporting 2.5V analog circuit power supply. ‌

Typical applications

The MC33778ASA1AE is commonly used in electric vehicle battery systems and industrial energy storage devices as a battery cell controller to achieve voltage monitoring, balancing and data communication.

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