DS1855E-010/T&R

Digital Potentiometers Overview

The DS1855E-010/T&R is a dual nonvolatile digital potentiometer and secure memory device from Analog Devices. It integrates one 10kΩ, 100-position linear taper potentiometer and one 10kΩ, 256-position linear taper potentiometer, alongside 256 bytes of EEPROM memory. The component operates on a 2-wire serial interface (SDA/SCL) with supply voltages ranging from 2.7V to 5.5V. It features hardware write protection via the WP pin and software-controlled locking for specific memory blocks. The device supports industrial temperature ranges (-40°C to +85°C) and includes nonvolatile wiper storage to retain settings after power loss.

Digital Potentiometers Feature Summary

• Dual linear taper potentiometers: Pot 0 (10kΩ, 100 positions) and Pot 1 (10kΩ, 256 positions).
• 256-byte EEPROM with dedicated registers for wiper position storage at addresses F8h and F9h.
• Hardware write-protect pin (WP) and software-configurable lock bytes for data security.
• Standard 2-wire serial interface supporting Standard Mode (100kHz) and Fast Mode (400kHz).

Digital Potentiometers Applications

• Bias voltage and current setting in control applications.
• System configuration and calibration data storage.
• Multi-device bus systems requiring addressable potentiometer control.

Digital Potentiometers Procurement Notes

Verify the 'T&R' suffix indicates tape-and-reel packaging when sourcing. Confirm the 'E' designation aligns with the specific manufacturing revision or environmental compliance requirements specified by the supplier. Ensure the operating environment stays within the -40°C to +85°C industrial temperature range for guaranteed performance.

Digital Potentiometers Selection Notes

Select this model specifically for its combination of a 100-position and a 256-position 10kΩ potentiometer. Other variants like DS1855-020 offer different resistance values for Pot 1. Ensure the application requires nonvolatile storage, as the EEPROM retains wiper settings without power. Verify that the 2-wire interface compatibility matches the master controller's capabilities.

Digital Potentiometers Part Context

The DS1855 serves as an upgrade to the DS1845, introducing software write protection capabilities. It consolidates two digital potentiometers and secure memory into a single package, reducing circuit complexity for biasing and calibration tasks. The device is available in TSSOP, CSBGA, and flip-chip packages, offering flexibility for various board space constraints.

Digital Potentiometers Replacement Considerations

The DS1845 is a related component but lacks the software write protect feature found in the DS1855. When replacing, ensure the substitute part supports the required 2-wire interface timing and voltage levels. Verify that the replacement maintains the same potentiometer resistance and position counts if exact electrical characteristics are critical.