DS2703 SHA-1 Battery Pack Authentication IC www.maxim-ic.com GENERAL DESCRIPTION FEATURES The DS2703 provides a robust cryptographic solution Secure Challenge and Response Authentication to ensure the authenticity of Li-Ion battery packs for Using the SHA-1 Algorithm cell phone, PDA, and portable computing devices. Directly Powered by the Dallas 1-Wire Interface The DS2703 employs the Secure Hash Algorithm with 16kbps Standard and 143kbps Overdrive (SHA-1) specified in the Federal Information Communication Modes publication 180-1 and 180-2, and ISO/IEC 10118-3. Unique 64-Bit Serial Number SHA-1 is designed for authenticationjust what is Thermistor Multiplexer required for identifying battery packs manufactured Operates with V as Low as 2.7V PULLUP by authorized sources. Pb-Free 8-Pin MAX or 2mm x 3mm TDFN Package The devices SHA-1 engine processes a host transmitted challenge using its stored 64-bit secret PIN CONFIGURATION key and unique 64-bit ROM ID to produce a 160-bit response word for transmission back to the host. The secret key is securely stored on-chip and never transmitted between the battery and the host. A DS2703-based system produces a high degree of authentication security between a host system and its removable battery or other peripheral devices. The Thermistor Multiplexer feature allows a three contact battery pack configuration to support data and thermistor functions. When activated through 1-Wire command, the THM pin presents the thermistor impedance on the data contact and disconnects internal loading from the node. TYPICAL OPERATING CIRCUIT APPLICATIONS 2.5G/3G Wireless Handsets PDAs Handheld or Notebook Computers and Terminals Digital Still and Video Cameras ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE DS2703G+ -20C to +70C 2mm x 3mm TDFN DS2703G+ on DS2703G+T&R -20C to +70C Tape-and-Reel DS2703U+ -20C to +70C MAX-8 DS2703U+ on DS2703U+T&R -20C to +70C Tape-and-Reel 1-Wire is a registered trademark of Dallas Semiconductor. MAX is a registered trademark of Maxim Integrated Products. + Denotes lead-free package. Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. 1 of 20 REV: 061307 DS2703 SHA-1 Battery Pack Authentication IC ABSOLUTE MAXIMUM RATINGS Voltage Range on DQ, THM Pins Relative to Ground -0.3V to +18V Voltage Range on VB Pin Relative to Ground -0.3V to +6V Operating Temperature Range -40C to +85C Storage Temperature Range -55C to +125C Soldering Temperature See IPC/JEDEC J-STD-020A Specification Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device. RECOMMENDED DC OPERATING CONDITIONS (T = -20C to +70C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Communication Mode 0 5.5 DQ Pullup Voltage V V PULLUP Computation Mode 2.7 5.5 DQ, THM Relative Voltage V (Note 1) -0.3 15 V DQ-THM DQ to THM Resistor R (Note 2) 5 500 K DQ-THM DC ELECTRICAL CHARACTERISTICS (V = 2.7V to 5.5V, T = -20C to +70C.) PULLUP A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS I Standby Mode, V > V 1 2.5 A DQ0 DQ IH Communication Mode I 75 A DQ1 (Note 14) Computation Mode, I 0.25 mA DQ2 SHA-1 Computation Active DQ Load Current Thermistor Mux Active, I 1 A DQ3 (Note 3) 14.5 < V < 15.0V DQ I 10 mA PP o 0 < t < 50 C I (Note 4) 60 A PP-IDLE DQ Programming Voltage V Program Pulse, (Note 5, 6) 14.5 15.0 V PP Input Logic High: DQ V (Note 6) 0.8 V V IH PULLUP Input Logic Low: DQ V (Note 6) 0.5 V IL Output Logic Low: DQ V I = 4mA, (Note 6, 7) 0.4 V OL-DQ OL Output Logic Low: THM V I = 4mA, (Note 6, 7, 8) 0.4 V OL-THM OL Hold-Up Current: VB pin I THM pin Active, V = 2.70V 3.2 HU B A DQ Capacitance C (Note 9) 50 pF DQ EEPROM RELIABILITY SPECIFICATION (V = 2.7V to 5.5V, T = -20C to +70C.) PULLUP A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS o EEPROM Write Endurance N 0 < t < 50 C (Note 10) 1000 Cycles EEC 2 of 20