GX28E01

Basic performance
• 1024 Bits of EEPROM Memory Partitioned Into Four Pages of 256 Bits 
• On-Chip 512-Bit SHA-1 Engine to Compute 160- Bit Message Authentication Codes (MACs) and to Generate Secrets 
• Dedicated 64-Bit Write-Only Secret with a Feature to Extend the Secret Size to 320 Bits by Setting a 256-Bit Page as Both Read and Write Protected 
• 5-Byte Challenge Size for Read Authenticated Page with Optional “Anonymous” Mode 
• Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC as Authorization 
• User-Programmable Page Write Protection for Page 0, Page 3, or All Four Pages Together 
• User-Programmable OTP EPROM Emulation Mode for Page 1 (“Write to 0”) 
• Communicates to Host with a Single Digital Signal at 15.3kbps or 90.9kbps Using 1-Wire Protocol 
• Switch-point Hysteresis and Filtering to Optimize Performance in the Presence of Noise 
• Reads and Writes Over 2.8V to 5.25V Voltage Range from -55°C to +125°C 
• 6-Lead DFN and 3-Lead TO-92 Packages 
 
 
Application 
• Printer ink cartridge configuration and monitoring
• Medical sensor certification and calibration
• System intellectual property protection

Description 
GX28E01 combines 1024 bit EEPROM with query response authentication security using ISO/IEC 10118-3 Secure Hash Algorithm (SHA-1). This chip can handle 64 bit and 320 bit SHA-1 input block keys, as well as 64 bit random challenges and additional chip data, to provide a high degree of authentication security between the host system and the slave. The 1024 bit EEPROM array configuration is divided into 4 pages of 256 bits, with a 64 bit register to perform write operations. All memory pages can be set to write protected, and one page can be placed in EEPROM emulation mode (can only change from 1 state to 0 state). Each GX28E01 has its own 64 bit ROM registration code engraved by the factory. GX28E01 communicates through a 1-Wire bus with a single contact point. Communication follows the standard 1-Wire protocol, and in a multi device 1-Wire network, the registration number serves as the node address.

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