"We also have security built into every stage with an AES128 accelerator, message integrity check, key authentication and key refreshment,” said Vedantham.
The wireless BMS opens up the possibility of putting batteries in other places in the vehicle he says. “This gives more flexible designs, in the hood, into other parts of the vehicle, and we are very well positioned there,” he said.
The system has been evaluated by TUV SUD to be suitable for an ASIL-D safety design. “This is designed from scratch for automotive safety from the ground up with IS26262 up to ASIL-D with a quality managed radio IC,” said Karl-Heinz Steinmetz, general manager for Powertrain in Automotive Systems at TI. “TUV SUD assessed the error detection and the common factor to achieve an ASIL-D system including the failure mode diagnostic analysis. ASIL-D is the one additional thing to complete the system with the confidence level with the assessment from TUV SUD. We are able to support customers with a full system not just pieces of the system.”
The ASIL-D capability comes from the fault management approach.
“Even in the case of a failure there is a bus restart of a max 300ms the full system is back and running again and that allows the car maker to build up a system that has the latest information in real time even in the case of a restart,” said Ivo Marocco, director of business development and functional safety for Battery Automotive products.
The wireless BMS also cuts the cost of the wiring, capacitors and opto-isolation used in traditional systems.
The CC2662R-Q1 wireless MCU is priced at US$2.79 in 1,000-unit quantities while the 16-channel BQ79616-Q1 comes in a 10-mm-by-10-mm, 64-pin thermally enhanced thin quad flat package (HTQFP), and is priced at US$6.90 in 1,000-unit quantities.
The SimpleLink wireless BMS software development kit (SDK) is available with a SimpleLink wireless BMS evaluation module (CC2662RQ1-EVM-WBMS).
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