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Conserve Battery Power in HEV/EVs with Automatic Host Reverse Wakeup

Deepak Uppal, System Engineer, Texas Instruments

As more vehicles become electrified, the need to achieve the highest levels of functional safety with high-accuracy battery monitoring is paramount. Yet to improve battery-monitoring accuracy, the vehicle’s battery management system must work efficiently in real time to monitor the performance of the individual battery cells within.

In typical hybrid electric vehicle (HEV) and electric vehicle (EV) configurations, the battery management unit (BMU) is powered from a 12-V battery. This battery remains on even when the car is parked or turned off, in order to support features like remote key entry, security and battery monitoring. When the car is parked, to ensure proper health of the battery, the microcontroller (MCU) has to periodically wake up to look for faults in high-voltage battery packs. This periodic wakeup draws current and can prematurely discharge the 12-V battery.

Design engineers and automotive manufacturers can now consider a new automatic host reverse wake-up feature that enables the host MCU to be off and rely instead on a supply power-management integrated circuit (PMIC) to remain in low-power mode and conserve 12-V battery power.

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