FlexiHash™ For Battery Authentication

The ISL6296A is a highly cost-effective fixed-secret hash engine based on Intersil’s FlexiHash™ technology. The device’s authentication is achieved through a challenge response scheme, which is customized for low-cost applications where cloning via eavesdropping without knowledge of the device’s secret code is not economically viable. When used for its intended applications, the ISL6296A offers the same level of effectiveness as other significantly more expensive high maintenance monetary-grade hash algorithm and authentication schemes.

FEATUREs
• Challenge-response based authentication scheme using
    32-bit challenge code and 8-bit authentication code
• Fast and flexible authentication process. Multipass
    authentication can be used to achieve the highest security
    level if necessary
• 16x8 OTP ROM stores up to three sets of 32-bit host selectable
    secrets with additional programmable memory for storage of
    up to 48 bits of ID code and/or pack information
• FlexiHash engine uses two sets of 32-bit secrets for
    authentication code generation
• Nonunique mapping of the secret key to an 8-bit
    authentication code maximizes hacking difficulty due to
    need for exhaustive key search (superior to SHA-1)
• Supports 1-cell Li-ion/Li-Poly and 3-cell series NiMH battery
    packs (2.6V ~ 4.8V operation), or powered by the XSD bus
• XSD single-wire host bus interface communicates with all
    8250-compatible UART’s or a single GPIO. Supports CRC on
    read data and transfer bit-rate up to 23kbps
• True “Zero Power” sleep mode - automatically entered after
    a bus inactivity time-out period
• 5 Ld SOT-23, 8 Ld TDFN and 8 Ld µTQFN packages
• -25°C to +85°C operating temperature range
• Pb-free (RoHS compliant)

APPLICATIONs
• Battery pack authentication
• Printer cartridges
• Add-on accessories
• Other nonmonetary authentication applications