Si3474-KIT Silicon Labs

UG425: Si3474 EVB User s Guide Si3474 Quad 90 W Ethernet Port EVB KEY FEATURES The Si3474 is suitable for use in either a four-port 802.3bt PSE, eight-port 802.at PSE, or a mix of 802.3bt and 802.3at ports. The Si3474 achieves this by having two separate IEEE 802.3bt compliant quads each powering four 2-pair ports. Each quad can either be configured for two Up to Four 802.3bt Ports or Eight 802.3at 802.3bt 4-pair ports of for four 802.3at 2-pair ports. The Si3474-EVB includes an RJ45 Ports interface board called the POE BT CB to allow evaluation of the Si3474 in a mixed AUTO Mode Jumpers 802.3bt and 802.3at system. No software needed for basic operation Configurable Max Port Power The Si3474-EVB can power up PDs without any software installation needed. The 2 Available Direct I C Access to Si3474 Si3474-EVB can be jumper-selected (J8) to automatically configure the Si3474 Port Registers Power Allocation. Note that when using the Si3474 in AUTO mode, the ports must either USB Interface using Silicon Labs all be in 802.3bt mode or 802.3at mode. To use the Si3474 in a mixed system, it will be 2 CP2112 USB to I C Bridge 2 necessary to access the Si3474 registers through I C. The Si3474-EVB allows access 2 Python interface to Windows, Linux or to the Si3474 registers through a Silicon Labs CP2112 USB to I C bridge. A Python in- MacOS terface is provided to allow evaluation through Windows PC, Linux or MacOS comput- ers. Parameter Condition Specifications PSE Input Voltage Range Connector J4 52 to 57 V PoE Type/Class Type 4, Class 8 IEEE 802.3bt Daughtercard Size 2.5 x 2.5 inches, 61 x 61 mm Baseboard Size 3 x 5.35 inches, 76 x 136 mm EVB Height Does not include headers 1.2 inch, 30 mm silabs.com Building a more connected world. Rev. 0.2 Table of Contents 1. Kit Description and Powering Up the Si3474 EVB..................3 2. Software Drivers..............................8 3. Si3474 Baseboard, Daughter Board and POE BT CB Board Schematics.........9 3.1 Motherboard Schematics ..........................9 3.2 Daughtercard Schematics ..........................12 3.3 Connector Board Schematic .........................16 4. Si3474 Bills of Materials .......................... 17 4.1 Motherboard BOM.............................17 4.2 Daughtercard BOM ............................19 4.3 Connector Board BOM ...........................19 5. Appendix................................ 20 silabs.com Building a more connected world. Rev. 0.2 2