DS1961S 1024-bit EEPROM
Key features:
- The 1128-bit 5V EEPROM memory is divided into four-page, 256-bit, 64-bit write-only keys and up to five general-purpose read/write registers
- Write access to the secret you need to know and the computing power and transfer authorization of the 160-bit MAC
- Can be secretly and data memory write-protected (all or 0) or EPROM emulation mode ("write 0", page 1)
- The on-chip 512-bit SHA-1 engine computes the 160-bit MAC and generated secrets
- A wide 2.8V voltage range from -40°C to 5.25V to +85°C is read and written
- Communicate with a single digital signal, host 14.1kb per second using the 1-Wire protocol
- On-chip 16-bit CRC generator to ensure data transmission
- High-speed mode increases communication speed to 125kbps
- Operating temperature range from -40°C to +85°C
- Data for a minimum of 10 years is stored at 85°C
Universal I-button functionality
- Uniquely, the factory-lithography and tested 64-bit registration number (8-digit family code + 48-bit serial number + 8-bit CRC check code) guarantees absolute traceability because no two devices are the same
- Multipoint controller for 1-Wire networks
- Digital recognition and instantaneous contact with information
- The chip-based data carrier stores information tightly
- Data can be accessed while being opposed
- The button shape and cup-shaped probe are self-adjusting
- The durable stainless steel case is engraved with a registration number to withstand harsh environments
- Easily apply self-adhesive backing with its flange latching, or lock with a ring on the edge that presses it
- When detecting an answer, the reader is applied to the voltage for the first time
description
DS1961S combines 1024-bit EEPROM, 64-bit keys, an 8-byte register/control page for up to five user read/write bytes, a 512-bit SHA-1 engine, and a full-featured 1-Wire® interface with a rugged I-button ®. With the 1-Wire protocol, only one data cable and a ground loop are required to transmit data serially. An additional memory area DS1961S called a register acts as a buffer when written to the main memory, register page, or when a new secret is installed. The data is first written to the register, from where it can be read back. Once the data has been verified, the copy register command transmits the data to the final storage location, DS1961S specified, receiving a matching 160-bit message authentication code (MAC). MAC computing involves secret and additional data stored in the DS1961S, including the identity registration of the device. Loadable No need to provide MAC only a new secret. The SHA-1 engine can also activate the MAC to compute 160-bit when reading a stored page or computing a new secret instead of loading it.
DS1961S understands a unique command "Refresh staging." ” Proper use of the refresh order after the copy register operation (see Write Verification section) reduces weak bit failures in the touch environment. The refresh sequence also provides a means to restore the functionality of the weak state bit device.
Each DS1961S has its own 64-bit ROM registration code, which is provided by the factory lithography chip to ensure absolute traceability. Rugged stainless steel enclosure with high resistance to environmental hazards such as dust, moisture and impact. Its compact coin-operated profile self-mating socket mates make it DS1961S easy to use manually. Accessories allow DS1961S to be mounted on almost any surface, including plastic keychains and photo ID badges.