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The PI7C1401 is a I²C-bus/SPI Quad Port Expander, it’s specifically designed to manage common port types such as SFP+ and QSFP+. The PI7C1401 provides an I²C-bus/SPI interface, an interrupt output to host and four I²C interfaces, general purpose pins for low-speed control signals to the modules. The PI7C1401 can be used a wide range of applications such as Networking, Telecom, Storage/Data center, Embedded. The typical usage for this device is high volume applications requiring an "expander" to aggregate all low-speed control and I²C signals across four ports and presents a single I²C or SPI interface to host. Multiple PI7C1401s can be used in high-port-count applications with one I²C or SPI to host. The system BOM cost can be cut by using smaller IO count control device(FPGAs, CPLDs, MCUs) and by reducing routing layer congestion.
Support Low-speed signals management and I²C aggregation across four ports
Support multiple PI7C1401s to control high-port-count through a single host interface
Selectable I²C (up to 1Mhz) or SPI (up to 33Mhz) host control interface
Automatic pre-fetching of critical, user-specified data from the modules
Advanced LED features for port status indication, including programmable blinking and dimming
Support standard SFF-8431, SFF-8472, SFF-8436, SFF-8679, INF-8074 and other such low-speed electrical interfaces, including a dedicated 100/400Khz I²C interface to each port
Customizable events which trigger an interrupt to the host
Broadcast Mode allows writes to all ports simultaneously