DS1490F

Preliminary DS1490F 2-in-1 Fob* www.dalsemi.com FEATURES 1-Wire® to USB port adapter for direct connection to notebook and desktop computers Any iButton™ mounts in the ergonomically angled handle for touch-and-go applications such as door entry Fast, convenient computer log on with data rates up to142k bits/second from the 1-Wire signal USB guard protects the USB A connector www.DataSheet4U.com during everyday use conditions. 1.5M byte speed, low power, USB 1.2 compliant for plug and play operation LED shines through translucent case to indicate status Both the 2-in-1 Fob and its resident iButton are powered entirely from an USB interface Fob sources up to 10 ma for powering 1-Wire chips that require strong pull up such as the Java™-powered or Thermochron iButton Low Profile Blue Dot extends 1-Wire signaling to other 1-Wire devices ✼ NOTE: The DS1490F 2-in-1 Fob is sold without the iButton to give choice of the desired iButton. 1 of 3 101000 DS1490F www.DataSheet4U.com DESCRIPTION The 2-in-1 Fob has a DS2490 chip in its handle to convert 1-Wire signaling to USB communication. In this way an iButton, 1-Wire chip, or 1-Wire instrument can have a 2-way communication link with its USB host. Any iButton from the lowest cost to the most sophisticated can be mounted in the angled end of the fob. A Java-powered iButton in combination with the 2-in-1 Fob provides the equivalent of a Java smart card with a built in reader. Everything fits in the handle, so there is no cable for...