DS2490
USB与1-Wire桥接芯片
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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
- 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
- 0°C to +70°C operating temperature range
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