1024-Bit 1-Wire EEPROM

The DS2431 is a 1024-bit, 1-Wire® EEPROM chip organized as four memory pages of 256 bits each. Data is written to an 8-byte scratchpad, verified, and then copied to the EEPROM memory. As a special feature, the four memory pages can individually be write protected or put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. The DS2431 communicates over the single-conductor 1-Wire bus. The communication follows the standard 1-Wire protocol. Each device has its own unalterable and unique 64-bit ROM registration number that is factory lasered into the chip. The registration number is used to address the device in a multidrop, 1-Wire net environment.

Applications

* Accessory/PC Board Identification * After-Market Management of Consumables * Analog Sensor Calibration Including IEEEP 1451.4 Smart Sensors * Ink and Toner Print Cartridge Identification * Medical Sensor Calibration Data Storage

* Easily Add Traceability and Relevant Information to Any Individual System

* 1024 Bits of EEPROM Memory Partitioned Into Four Pages of 256 Bits

* Individual Memory Pages Can Be Permanently Write Protected or Put in EPROM-Emulation Mode (Write to 0)

* Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise

* Minimalist 1-Wire Interface Lowers Cost and Interface Complexity

* IEC 1000-4-2 Level 4 ESD Protection (±8kV Contact, ±15kV Air, typ)

* Reads and Writes Over a Wide Voltage Range from 2.8V to 5.25V from -40°C to +85°C

* Communicates to Host with a Single Digital Signal at 15.4kbps or 125kbps