Analog Devices Inc./Maxim Integrated

The DS1845 Dual NV Potentiometer and Memory consists of one 100-position linear taper potentiometer, one 256-position linear taper potentiometer, 256 bytes of EEPROM memory, and a 2-wire interface. The device provides an ideal method for setting bias voltages and currents in control applications using a minimum of circuitry. The EEPROM memory allows a user to store configuration or calibration data for a specific system or device as well as provide control of the potentiometer wiper settings. Any type of user information may reside in the first 248 bytes of this memory. The next two addresses of EEPROM memory are for potentiometer settings. Access to this EEPROM is via an industry standard 2-wire bus. The wiper position of the DS1845, as well as EEPROM data, can be hardware write-protected using the Write Protect (WP) input pin. Up to eight DS1845s can be installed on a single 2-wire bus. Access to an individual device is achieved by using a device address that is determined by the logic levels of address pins A0 though A2. Additionally, the DS1845 will operate from 3 volt or 5 volt supplies. Three package options are available: Flip Chip Package, 16-ball CSBGA and 14-pin TSSOP.

The DS1848 Dual Temperature-Controlled Nonvolatile (NV) Variable Resistor consists of two 256- position linear, variable resistors. The DS1848-050 consists of one 10kΩand one 50kΩ, while the DS1848-010 consists of two 10kΩ 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 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.

The DS1851 dual temperature-controlled nonvolatile (NV) DACs consists of two DACs, two EEPROM look-up tables, and a direct-to-digital temperature sensor. Both of the DACs can be programmed with any temperature coefficient, which means that any system temperature effects can be corrected without any additional external devices. The DS1851 provides an ideal method for setting and temperature-compensating bias voltages and currents in control applications using a minimal amount of external circuitry.The user-defined settings for both DACs are stored in two EEPROM look-up tables and can be accessed over the industry-standard 2-wire serial bus, which consists of SDA and SCL pins. These look-up tables can assign a unique output value to each DAC for every 4°C increment over the -40°C to +95°C range. The output of the digital temperature sensor is also available as a 12-bit, two's complement value over the serial bus.ApplicationsAutomated Test Equipment (ATE)Automotive SensorsBuilding Energy Management (HVAC)Cell Phone Base StationsCell PhonesDigital Still CamerasIndustrial Sensor Transmitters/TransducersIndustrial Sensor Transmitters/TransducersSensor-ForceSensors - AccelerometersSensors - HumiditySensors - Piezo-Resistive transducersSensors - TemperatureSensors-PressureTest and Measurement Equipment