GENERAL DESCRIPTION

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 Dallas Semiconductor 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.

FEATURES

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

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

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

Communicates to Host with a Single Digital Signal at 15.4kbps or 111kbps Using 1-Wire Protocol

APPLICATIONS

Accessory/PC Board Identification

Medical Sensor Calibration Data Storage

Analog Sensor Calibration Including IEEE

P1451.4 Smart Sensors

Ink and Toner Print Cartridge Identification

After-Market Management of Consumables