Dual, Temperature-Controlled Resistors with Calibrated Monitors and Password Protection

The DS1856M dual, temperature-controlled, nonvolatile (NV) variable resistors with three monitors consists of two 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.

The DS1856M includes 128 bytes of EEPROM memory at A2h slave address, Table 00/01. The DS1856M also includes three-levels of password protection. The DS1856-01 includes 256 bytes of A0h EEPROM memory. The DS1856B-M50+ and DS1856E-M50+ are drop-in replacements for the DS1856B-050+ and DS1866E-050+, respectively. The enhancements include 256 bytes of EEPROM at A0h; selectable MON2, MON3 references; and a 13-bit ADC. These are backward compatible by default with the DS1856B-050+/DS1856E-050+.

Applications

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

* SFF-8472 Compatible

* 13-Bit ADC

* Two Linear, 256-Position, Nonvolatile Temperature-Controlled Variable Resistors with 2°C Resolution

* Three Levels of Security

* Access to Monitoring and ID Information Configurable with Separate Device Addresses

* 2-Wire Serial Interface

* Two Buffers with TTL/CMOS-Compatible Inputs and Open-Drain Outputs

* Operates from a 3.3V or 5V Supply

* -40°C to +95°C Operating Temperature Range