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 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 of the full data sheet.
关键特性
Communicates at regular and overdrive 1-Wire 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
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