DS1858

Rev 0; 1/03 www.DataSheet4U.com Dual Temperature-Controlled Resistors with Three Monitors General Description Features ♦ Five Total Monitored Channels (Temperature, VCC, MON1, MON2, MON3) ♦ Three External Analog Inputs (MON1, MON2, MON3) ♦ Internal Direct-to-Digital Temperature Sensor ♦ Two 50kΩ, Linear, 256-Position, Nonvolatile Temperature-Controlled Variable Resistors ♦ Resistor Settings Changeable Every 2°C ♦ Access to Monitoring and ID Information Configurable with Separate Device Addresses DS1858 The DS1858 dual temperature-controlled nonvolatile (NV) variable resistors with three monitors consists of two 50kΩ 256-position linear variable resistors, three analog monitor inputs (MON1, MON2, MON3), and a direct-to-digital temperature sensor. The device provides an ideal method for setting and temperature-compensating bias voltages and currents in control applications using minimal circuitry. The variable resistor settings are stored in EEPROM memory and can be accessed over the 2-wire serial bus. Applications Optical Transceivers Optical Transponders Instrumentation and Industrial Controls RF Power Amps Diagnostic Monitoring ♦ 2-Wire Serial Interface ♦ Two Buffers with TTL/CMOS-Compatible Inputs and Open-Drain Outputs ♦ Operates from a 3.3V or 5V Supply ♦ SFF-8472 Compatible Typical Operating Circuit PART VCC VCC = 3.3V 4.7kΩ 2-WIRE INTERFACE Tx-FAULT 4.7kΩ 1 2 3 4 5 LOS GROUND TO DISABLE WRITE PROTECT 6 7 8 SDA SCL OUT1 IN1 OUT2 IN2 WPEN GND VCC H1 L1 16 15 14 0.1...