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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 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 (¡À8kV Contact, ¡À15kV Air, Typical)

? Reads and Writes Over a Wide Voltage Range from 2.8V to 5.25V from -40¡ãC to +85¡ãC

? Communicates to Host with a Single Digital Signal at 15.4kbps or 125kbps Using 1-Wire

Protocol

? Also Available as Automotive Version Meeting AEC-Q100 Grade 1 Qualification Requirements

(DS2431-A1)