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 (±8kV Contact, ±15kV Air, Typical)

♦ 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 Using 1-Wire

Protocol

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

(DS2431-A1)