DS3903

www.DataSheet4U.com Rev 0; 6/02 Triple 128-Position Nonvolatile Digital Potentiometer General Description The DS3903 contains three nonvolatile (NV) low temperature coefficient digital potentiometers, which can be accessed through a 2-wire bus. It operates in both 3V and 5V systems, and it features a write-protect pin that can lock the positions of the potentiometers. An address pin allows two DS3903s to be placed on the same 2-wire bus. Features ♦ Three 128-Position Linear Potentiometers (Two 10kΩ, One 90kΩ) ♦ NV Wiper Storage ♦ 0 to 5.5V on Any Potentiometer Terminal Independent of VCC ♦ Low End-to-End Temperature Coefficient ♦ Operates on an Industry-Standard 2-Wire Bus ♦ Write-Protect Pin ♦ Supply Voltage: 3V or 5V ♦ Operating Temperature Range: -40°C to +85°C ♦ Packaging: 20-Pin TSSOP DS3903 Applications Power-Supply Calibration Mobile Phones and PDAs Fiber Optics Transceiver Modules Portable Electronics A Small, Low-Cost Replacement for Mechanical Potentiometers Ordering Information PART TEMP RANGE -40°C to +85°C -40°C to +85°C PIN-PACKAGE 20 TSSOP 20 TSSOP (Tape-and-Reel) e DataShe DataSheet4U.com DS3903E-020 DS3903E-020/T&R Pin Configuration SDA 1 SCL 2 A0 3 WP 4 N.C. 5 L0 6 W1 7 L1 8 L2 9 GND 10 20 VCC 19 N.C. 18 N.C. 17 N.C. 0.1µF 4.7kΩ 2-WIRE MASTER VCC Typical Operating Circuit VCC DS3903 VCC 4.7kΩ SCL SDA POTENTIOMETER 0 10kΩ ADDDR F9h VCC POTENTIOMETER 1 90kΩ ADDDR F8h GND POTENTIOMETER 2 10kΩ ADDDR FAh 5.1kΩ Iref VARIABLE RESISTANCE FOR ADJUSTABLE C...