DS1847

Features:

 Two linear taper, temperature-controlled variable resistors
  DS1847-050
     One 50k, 256 position
     One 10k, 256 position
 DS1847-010
    Two 10k, 256 position
 Resistor settings changeable every 2°C
 Access to temperature data and device control via a 2-wire interface
  Operates from 3V or 5V supplies
 Packaging: 14-pin TSSOP, 16-ball CSBGA
 Operating temperature: -40ºC to +95ºC
 Programming temperature: 0ºC to +70ºC


Pinout




Specifications

Voltage on Any Pin Relative to Ground ...................-0.3V to +6.0V
Operating Temperature...................................... -40°C to +95°C
Programming Temperature ....................................0°C to +70°C
Storage Temperature .......................................-55°C to +125°C
Soldering Temperature See J-STD-020A specification
* This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.


Description

The DS1847 Dual Temperature-Controlled Nonvolatile (NV) Variable Resistor consists of two256- position linear, variable resistors. The DS1847-050 consists of one 10kand one 50k, while the DS1847-010 consists of two 10k resistors; both incorporate 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 a minimum of circuitry.

The DS1847 variable resistors settings are stored in EEPROM memory and can be accessed over the industry standard 2-wire serial bus. The value of each variable resistor is determined by a temperature-addressed look-up table, which can assign a unique value to each resistor for every 2°C increment over the -40°C to +95°C range. The output of the digital temperature sensor is also available as a 13-bit, 2's complement value over the serial bus. The interface I/O pins consist of SDA and SCL.