DS1854

Features:

 Four Total Monitored Channels (Temperature, VCC, MON1, MON2)

Two External Analog Inputs (MON1, MON2)
Internal Direct-to-Digital Temperature Sensor

Two 50k,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

Resistor Disable (Open-Circuit) Function
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

Application

Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Diagnostic Monitoring


Pinout




Specifications

Voltage on V_CC Relative to Ground.......................-0.5V to +6.0V
Voltage on Inputs Relative
to Ground*................................................-0.5V to V_CC + 0.5V
Voltage on Resistor Inputs
Relative to Ground*...................................-0.5V to V_CC + 0.5V

Current into Resistors............................................................5mA
Operating Temperature Range ...........................-40°C to +95°C
Programming Temperature Range.........................0°C to +70°C
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature.......................................See IPC/JEDEC

Description

The DS1854 dual temperature-controlled nonvolatile (NV) variable resistors with two monitors consists of two 50k  256-position linear variable resistors, two analog monitor inputs (MON1, MON2), 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.