EV Battery Manager Extends Driving Range
By Mat Dirjish
STMicroelectronics L9963 battery-management system chip for electric vehicles promise to extend driving range, reliability, and safety. According to the company, its battery-management system (BMS) controller features the industry’s best voltage accuracy for longer driving range and battery life with extra temperature-monitoring inputs for enhanced safety.
A typical BMS application uses multiple L9963 devices to monitor groups of cells in a battery stack, managed by a host microcontroller (MCU). One L9963 can monitor up to 14 stacked battery cells, measuring voltages with accuracy better than 2 mV in the 1.7V–4.7V range. The device simultaneously digitizes all sensed values and eliminates cell-synchronization delays. It can also monitor up to seven external temperature sensors.
Other features include:
- Meeting ASIL-D requirements in compliance with the ISO 26262 standard.
- A redundant cell-measurement path that enhances safety and provides support for a ‘limp home’ mode.
- Fault-detection and notification functions meeting automotive safety requirements.
- A serial peripheral interface (SPI).
- A 2.66-Mbps vertical communication interface for communication between multiple L9963 ICs. This permits eight devices to convert and read 96 cells in less than 4 ms.
- Hot plugging without external Zener diodes.
The L9963 is in production now and ready for new designs. For more information, take a gander at the Automotive Battery Management System (BMS) page.
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