The ISL9206A is a highly cost-effective fixed-secret hash

engine based on Intersil’s second generation FlexiHash™

technology. The device authentication is achieved through a

challenge-response scheme 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

ISL9206A offers the same level of effectiveness as other

significantly more expensive high-maintenance hash

algorithm and authentication schemes.

The ISL9206A 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 ISL9206A 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 non-crystal 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 ISL9206A 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. Multi-pass

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.

• Non-unique 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 or 8 Ld TDFN (2mmx3mm) packages

• -25°C to +85°C operating temperature range

• Pb-free (RoHS compliant)

Applications

• Battery Pack Authentication

• Printer Cartridges

• Add-on Accessories

• Other Non-Monetary Authentication Applications