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DS2490 Datasheet

  • DS2490

  • USB to 1-WireTM Bridge Chip

  • Dallas   Dallas

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PRELIMINARY
DS2490
USB to 1-Wire
TM
Bridge Chip
www.dalsemi.com
FEATURES
摟
摟
摟
摟
摟
摟
摟
摟
Communicates at regular and Overdrive 1-
Wire speeds
Supports 12V EPROM programming and stiff
5V pullup for crypto iButton, sensors and
EEPROM
Slew rate controlled 1-Wire timing and active
pullup to accommodate long lines and reduce
radiation
Programmable 1-Wire timing and driver
characteristics accommodate a wide range of
MicroLAN configurations at regular speed
Smart 1-Wire protocol combines data and
control information without requiring extra
pins
High-speed 12 Mbps USB interface
Integrated USB-compliant transceiver
Supports USB remote wakeup to resume a
suspended host system
PIN ASSIGNMENT
16-Pin SOIC
300-Mil
ORDERING INFORMATION
DS2490S
16-Pin SOIC
DESCRIPTION
The DS2490 is a bridge chip that enables communication between the Universal Serial Bus (USB) and a
1-Wire bus. It provides regular, overdrive and flexible 1-Wire communication speeds and a full-speed 12
Mbps connection to USB. USB vendor-specific commands defined in this specification are used to
control the DS2490 and communicate with attached 1-Wire devices. A functional block diagram of the
DS2490 is shown in Figure 1.
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033199

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