FlexiHash+™ For Battery AuthenticationThe ISL9206A is a highly cost-effective fixed-secret hashengine based on Intersil’s second generation FlexiHash™technology. The device authentication is achieved through achallenge-response scheme customized for low-costapplications, where cloning via eavesdropping withoutknowledge of the device’s secret code is not economicallyviable. When used for its intended applications, theISL9206A offers the same level of effectiveness as othersignificantly more expensive high-maintenance hashalgorithm and authentication schemes.The ISL9206A has a wide operating voltage range, and issuitable for direct powering from a 1-cell Li-ion/Li-Poly or a3-cell series NiMH battery pack. The ISL9206A can also bepowered by the XSD bus when the bus pull-up voltage is3.3V or higher. The device connects directly to the cellterminals of a battery pack, and includes on-chip voltageregulation circuit, POR, and a non-crystal based oscillator forbus timing reference.Communication with the host is achieved through a singlewire XSD interface (a light-weight subset of Intersil’s ISD businterface). The XSD bus is compatible for use with serial portsoffered by all 8250 compatible UART’s or a single GPIO(General Purpose Input and Output) pin of a microprocessor.A clone prevention solution utilizing the ISL9206A offerssafety and revenue protection at the lowest cost and power,and is suitable for protection against after-marketreplacement for a wide variety of low-cost applications.
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