The PCA9549 provides eight bits of high speed TTL-compatible bus switching controlledby the I2C-bus. The low ON-state resistance of the switch allows connections to be madewith minimal propagation delay. Any individual A to B channel or combination of channelscan be selected via the I2C-bus, determined by the contents of the programmable Controlregister. When the I2C-bus bit is HIGH (logic 1), the switch is on and data can flow fromPort A to Port B, or vice versa. When the I2C-bus bit is LOW (logic 0), the switch is open,creating a high-impedance state between the two ports, which stops the data flow.An active LOW reset input (RESET) allows the PCA9549 to recover from a situationwhere the I2C-bus is stuck in a LOW state. Pulling the RESET pin LOW resets the I2C-busstate machine and causes all the bits to be open, as does the internal power-on resetfunction.
EPC-6000是廣州致遠電子有限公司基于S3C2440A處理器（ARM920T架構）、采用標準PC/104結構設計的一款嵌入式通用PC/104 嵌入式工控機主板。其資源豐富、接口齊全、功耗低、可靠性高，預裝正版Microsoft Windows CE 5.0操作系統，并提供所有板載外設驅動庫，可通過本地U盤或Internet遠程升級Windows CE操作系統
