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.
The ISL6296A has a wide operating voltage range and is suitable
for direct powering from a 1-cell Li-ion/Li-Poly or a 3-cell series
NiMH battery pack. The ISL6296A can also be powered by the
XSD bus when the bus pull-up voltage is 3.3V or higher. The device
connects directly to the cell terminals of a battery pack and
includes on-chip voltage regulation circuit, POR and a noncrystal
based oscillator for bus timing reference.
Communication with the host is achieved through a single-wire
XSD interface (a light-weight subset of Intersil’s ISD bus
interface). The XSD bus is compatible for use with serial ports
offered 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 ISL6296A offers
safety and revenue protection at the lowest cost and power
and is suitable for protection against after-market
replacement for a wide variety of low-cost applications.

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