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