The DS28E10 combines secure challenge-and-response authentication functionality based on the FIPS 180-3 specified Secure Hash Algorithm (SHA-1) with 224 bits of one-time programmable user EPROM in a single chip. Once written, the memory is automatically write protected. Additionally, each device has its own guaranteed unique 64-bit ROM identification number (ROM ID) that is factory programmed into the chip. Memory writes are performed 4 bytes at a time. A secure and low-cost factory programming service is available to preprogram device data, including the SHA-1 security data components. The device communicates over the single-contact 1-Wire bus. The communication follows the standard 1-Wire protocol with the ROM ID acting as node address in the case of a multidevice 1-Wire network.
Feature
- Dedicated Hardware-Accelerated SHA-1 Engine for Generating SHA-1 MACs
- One Page of 28-Byte User OTP EPROM
- Irreversible Write Protection
- Unique Factory-Programmed 64-Bit Identification Number
- 1-Wire Interface for Standard and Overdrive Speeds
- Communicates with Host at Up to 15.4kbps at Standard Speed or Up to 125kbps in Overdrive Mode
- Operating Range from 2.8V to 3.6V, -40°C to +85°C
- 3-Lead SOT23 and 6-Lead TSOC Packages
- ±6kV Human Body Model (HBM) ESD Protection (typ) on the 1-Wire and VCC Pin
Applications
- Reference Design License Management
- Sensor/Accessory Authentication and Calibration
- System Intellectual Property Protection
