DS2490

19-4993; 10/09 www.maxim-ic.com FEATURES  Communicates at regular and overdrive 1Wire® speeds  Supports stiff 5V pullup for EEPROM, sensors, and crypto iButton®  Slew rate controlled 1-Wire timing and active pullup to accommodate long 1-Wire network lines and reduce radiation  Programmable 1-Wire timing and driver characteristics accommodate a wide range of 1-Wire network configurations  Low- to high-level command types, including macros, for generating 1-Wire communication  Crystal oscillator timebase provides precision timed 1-Wire waveforms  High-speed 12Mbps Universal Serial Bus (USB) interface  Integrated USB-compliant transceiver  Supports USB remote wake-up from a 1-Wire device event to resume a suspended host system  0oC to +70oC operating temperature range DS2490 USB to 1-Wire Bridge Chip PIN ASSIGNMENT PMOD NC NC NC VB SUSO DD+ NC 1-WIRE NC GND 1 2 3 4 5 6 7 8 9 10 11 12 24 VD 23 NC 22 NC 21 NC 20 XO 19 XI 18 NC 17 VD2 16 NC 15 NC 14 NC 13 NC 24-Pin SO Top View (300-mil) ORDERING INFORMATION PART NUMBER TEMP RANGE PIN-PACKAGE DS2490S+ 0oC to +70oC 24 SO (300 mil) DS2490S+T&R 0oC to +70oC 24 SO (300mil) + Denotes a lead(Pb)-free/RoHS-compliant package. T&R = Tape and reel. DESCRIPTION The DS2490 is a bridge chip that enables communication between a USB host system and a 1-Wire bus. It provides regular, overdrive, and flexible 1-Wire communication speeds and a full-speed 12Mbps connection to USB. USB vendor-specific commands defined in this ...