View ds1846 datasheet:

DS1846 NV Tri-Potentiometer, Memory and MicroMonitor www.dalsemi.com FEATURES PIN ASSIGNMENT Three linear taper potentiometers - Two 10 k?, 100 position SDA VCC - One 100 k?, 256 position SCL IN 256 bytes of EEPROM memory A0 PBRST Monitors microprocessor power supply, WP voltage sense, and external override RST NMI Access to data and potentiometer control via RST a 2-wire interface L0 H0 External Write Protect pin to protect data and W1 W0 potentiometer settings L1 H1 Nonvolatile wiper storage W2 L2 Operates from 3V or 5V supplies H2 GND Packaging: 20-pin TSSOP 20-pin TSSOP Industrial operating temperature: -40?C to +85?C Programming temperature: 0?C to +70?C PIN DESCRIPTION VCC - 3V or 5V Power Supply Input GND - Ground SDA - 2-wi