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Freescale rolls out Li-ion battery cell controller

Posted: 19 Sep 2014     Print Version  Bookmark and Share

Keywords:battery cell controller  MC33664  MC33771 

Freescale Semiconductor introduced a highly integrated 14-cell lithium-ion battery cell controller for industrial and automotive applications, designed to cost effectively meet the stringent requirements for ASIL-C functional safety.

With 14 cell balancing transistors, a current sensor with plus or minus 0.5 per cent accuracy from milliamps to kiloamps, and 2Mbit/s communication transceiver interface integrated into a single 64-pin QFP package, Freescale's MC33771 battery cell controller and companion MC33664 isolated communications interface deliver robust, reliable performance for 48V battery systems, enabling economical scalability beyond 1kV.

 MC33771 battery cell controller

The solution's built-in diagnostics help protect automotive and industrial battery packs against critical fault conditions, and its transformer coupled isolated high speed transceiver eliminates the need for expensive isolated CAN busses to meet ASIL-C requirements. Together, these features make the solution ideal for a broad range of automotive and industrial applications including 48V battery packs, hybrid and electric cars, E-bikes, and energy storage systems.

As automotive and industrial batteries are placed under increasing strain by new, mission-critical applications, challenges such as overcharge, overheating, and internal short circuit or overload must be controlled in order to help ensure safe operating conditions. It is crucial that the battery cell controller provide precise and reliable battery diagnostics by accurately measuring differential cell voltages, temperatures, and currents. It is equally critical that this information be communicated quickly and accurately from the battery cell controller to the pack controller for system-wide control and safety of the battery, allowing the full energy content of the battery to be utilised.

"The robust design and comprehensive integration of our new battery cell controller reflects Freescale's system-level approach to cost effectively manage battery charging while helping to prevent failures and dangerous conditions," said James Bates, senior vice president and general manager for Freescale's Analog and Sensors Group.

The MC33771 incorporates many critical functions required for controlling a single 48V battery pack, including the capability to synchronously measure currents and voltages with 2mV of accuracy within 65us, making it easier to meet ISO 26262 ASIL-C requirements. Embedded functional verification and fault diagnostics enable compliance with ISO 26262 ASIL-C functional safety standards without additional external circuitry.

For higher voltage systems, the integrated daisy chain differential transceiver communicates at 2Mbit/s using robust transformer coupled isolation up to 3,750V instead of expensive isolated CAN busses, while the MC33664 connects the battery pack directly to the system MCU's dual SPI interface using the same transformer coupled isolation. Freescale's battery cell controller solution delivers exceptional performance with a lower system bill of materials and robust system isolation for ASIL-C rated battery packs.

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