General Description

The DS2465 is a SHA-256 coprocessor with built-in 1-Wire® master that provides the SHA-256 and memory functionality required by a host system to communicate with and operate a 1-Wire SHA-256 slave. In addition, it performs protocol conversion between the I2C master and any attached 1-Wire SHA-256 slaves. For 1-Wire line driving, internal user-adjustable timers relieve the system host processor from generating time-critical 1-Wire waveforms, supporting both standard and overdrive 1-Wire communication speeds.

Features

♦ SHA-256 Engine to Operate a Symmetric-Key-Based Bidirectional Secure Authentication Model

♦ Two 32-Byte Pages of User EEPROM with Multiple Programmable Protection Options

♦ 1-Wire Master Port with Selectable Active or Passive 1-Wire Pullup

♦ Strong 1-Wire Pullup Provided by an Internal LowImpedance Signal Path

♦ 1-Wire Port Can Be Powered Down Under

♦oftware Control

♦ I2C Operating (Pullup) Voltage: 3.3V ±10

♦ ESD Protection of ±8kV HBM (typ) on 1-Wire IO Pin

♦ Operating Range: 3.3V ±10, -40NC to +85NC

♦ 6-Pin TSOC Package

Applications

    Authentication of Consumables

    Secure Feature Control