AD5255

3-Channel Digital Potentiometer with Nonvolatile Memory AD5255 FEATURES 3 channels: Dual 512-position Single 128-position 25 kΩ or 250 kΩ full-scale resistance Low temperature coefficient: Potentiometer divider 15 ppm/°C Rheostat mode 35 ppm/°C Nonvolatile memory retains wiper settings Permanent memory write protection Linear increment/decrement ±6 dB increment/decrement I2C-compatible serial interface 2.7 V to 5.5 V single-supply operation ±2.25 V to ±2.75 V dual-supply operation Power-on reset time 256 bytes general-purpose user EEPROM 11 bytes RDAC user EEPROM GBIC and SFP compliant EEPROM 100-year typical data retention at TA = 55°C VDD VSS GND SCL SDA A0_RDAC A1_RDAC A0_E A1_E COMMAND DECODE LOGIC POWER-ON RESET ADDRESS DECODE LOGIC DECODE LOGIC I2C SERIAL INTERFACE FUNCTIONAL BLOCK DIAGRAM RDAC0 REGISTER 256 BYTES USER EEPROM 32 BYTES RDAC EEPROM DATA CONTROL RDAC0 A0 W0 9 BIT RDAC1 B0 RDAC1 REGISTER A1 W1 9 BIT RDAC2 B1 RDAC2 REGISTER A2 W2 RS 7 BIT B2 04555-0-001 WP Figure 1. APPLICATIONS Mechanical potentiometer replacement RGB LED backlight control White LED brightness adjustment Programmable gain and offset control Programmable filters GENERAL DESCRIPTION The AD5255 provides dual 512-position and a single 128-position digitally controlled variable resistors1 (VR) in a TSSOP package. This device performs the same electronic adjustment function as a potentiometer, trimmer, or variable resistor. Each VR offers a completely programmable value of resistanc...