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型号	状态	说明
DS2490	该产品不推荐用于新的设计，推荐替代产品请查看订购信息。	DS2490仍可供货，但不建议用于新的设计。DS2480B和DS2482S-100作为替代产品能够提供UART/RS232或I2C与1-Wire的接口方案。

概述

完整的数据资料 (PDF, 1.3MB) 英文 下载 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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