DS1482

DS1482 1-Wire Level Shifter and Line Driver with Load Sensor www.maxim-ic.com Works with All iButtons® and 1-Wire® Devices § Communicates at Regular and Overdrive 1Wire Speed (Host-Dependent) § Separate Interface Power Supply to Level Shift to Non-5V Systems § External Strong-Pullup Control Pin can be Used to Provide Low-On-Resistance-High www.DataSheet4U.com Current Power Source § Load Sensor to Detect when Strong-Pullup Power Delivery is no Longer Needed § Power Delivery DONE Signal can be Connected to Host Interrupt § Low-Cost 16-Pin SO Surface-Mount Package § Operating Temperature Range: -40°C to +85°C § FEATURES PIN ASSIGNMENT VCCQ N.C. SPU START TXD N.C. GND N.C. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC N.C. PCTLZ DONE RXD N.C. I/O N.C. ORDERING INFORMATION DS1482S SO-16 DS1482S/T&R SO-16, Tape-and-Reel Contact the factory for versions with different signal polarities. DESCRIPTION The DS1482 is a simple 1-Wire line driver with load sensor and level shifter, designed to function as an interface between a 3V host system and a 1-Wire system that runs on 5V. Two supplies are provided, a 5V supply for the 1-Wire operations (VCC) and an interface supply (VCCQ). The DS1482 can connect directly to a synchronous serial port if it supports the appropriate bit rates to generate 1-Wire timing. Figure 1 shows the DS1482 block diagram. TXD is buffered and controls an N-channel transistor, which drives the 1-Wire pin I/O low, e.g., to initiate a time slot. The logic level of...