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UG425: Si3474 EVB User's Guide
Si3474 Quad 90 W Ethernet Port EVB
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
quads each powering four 2-pair ports. Each quad can either be configured for two
802.3bt 4-pair ports of for four 802.3at 2-pair ports. The Si3474-EVB includes an RJ45
interface board called the POE_BT_CB to allow evaluation of the Si3474 in a mixed
802.3bt and 802.3at system.
The Si3474-EVB can power up PDs without any software installation needed. The
Si3474-EVB can be jumper-selected (J8) to automatically configure the Si3474 Port
Power Allocation. Note that when using the Si3474 in AUTO mode, the ports must either
all be in 802.3bt mode or 802.3at mode. To use the Si3474 in a mixed system, it will be
necessary to access the Si3474 registers through I
to the Si3474 registers through a Silicon Labs CP2112 USB to I
terface is provided to allow evaluation through Windows PC, Linux or MacOS comput-
ers.
Parameter
PSE Input Voltage Range
PoE Type/Class
Daughtercard Size
Baseboard Size
EVB Height
silabs.com | Building a more connected world.
2
C. The Si3474-EVB allows access
2
C bridge. A Python in-
Condition
Connector J4
Type 4, Class 8
Does not include headers
KEY FEATURES
• IEEE 802.3bt compliant
• Up to Four 802.3bt Ports or Eight 802.3at
Ports
• AUTO Mode Jumpers
• No software needed for basic operation
• Configurable Max Port Power
• Available Direct I
2
C Access to Si3474
Registers
• USB Interface using Silicon Labs
2
CP2112 USB to I
C Bridge
• Python interface to Windows, Linux or
MacOS
Specifications
52 to 57 V
IEEE 802.3bt
2.5 x 2.5 inches, 61 x 61 mm
3 x 5.35 inches, 76 x 136 mm
1.2 inch, 30 mm
Rev. 0.1

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Summary of Contents for Silicon Laboratories Si3474-EVB

  • Page 1 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 •...
  • Page 2: Table Of Contents

    Table of Contents 1. Kit Description and Powering Up the Si3474 EVB ....3 2. Software Drivers ......8 3.
  • Page 3: Kit Description And Powering Up The Si3474 Evb

    C Addresses because there are two quads in every Si3474 device. Si347xy-MB Si3474-DC POE_BT_CB Baseboard Daughter Card RJ45 Connector Board Isolation Boundary Figure 1.1. Si3474-EVB Baseboard, Daughter Card, and RJ45 Connector Board Figure 1.2. Si3474-EVB Daughter Card silabs.com | Building a more connected world. Rev. 0.1 | 3...
  • Page 4 UG425: Si3474 EVB User's Guide Kit Description and Powering Up the Si3474 EVB Figure 1.3. J3 Configuration Header Table 1.1. J3 I C Address Selection Table Quad 0 Quad 1 C Address C Address 0x20 0x21 0x22 0x23 0x24 0x25 0x26 0x27 0x28...
  • Page 5 UG425: Si3474 EVB User's Guide Kit Description and Powering Up the Si3474 EVB The following figure shows the use case where the Si3474 is used as an 802.3at PSE, without an I C Host. The JP2 AUTO MODE SEL in this case can be set to either Position 7 or Position 6. The corresponding selection jumpers on the POE_BT_CB will need to be set in an alternating fashion so that the eight 802.3at ports can drive the RJ45 jacks as shown.
  • Page 6 UG425: Si3474 EVB User's Guide Kit Description and Powering Up the Si3474 EVB JP2 AUTO MODE SEL VOUT8 7 6 5 4 3 2 4pp Class 8 90W VOUT7 4pp Class 7 75W 7 6 5 4 3 VOUT6 VOUT5 7 6 5 4 4pp Class 6 60W Unused...
  • Page 7 UG425: Si3474 EVB User's Guide Kit Description and Powering Up the Si3474 EVB D9 indicates D7 Indicates that +5V is that the Isolated present +3.3V is present D4 and D5 indicate communication status between the CP2112 and the Host PC D3 Indicates that the Isolated VPWR is present...
  • Page 8: Software Drivers

    UG425: Si3474 EVB User's Guide Software Drivers 2. Software Drivers The Si3474-EVB has a USB port, allowing it to communicate with computer host running Windows, Linux or MacOS. The installation guide, documentation and software are available through the following download site. Please go to www.silabs.com/start-poe...
  • Page 9: Si3474 Baseboard, Daughter Board And Poe_Bt_Cb Board Schematics

    UG425: Si3474 EVB User's Guide Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics 3. Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics Silicon Labs will provide a free schematic and PCB layout review. Visit www.siliconlabs.com/support to submit a support request for the review.
  • Page 10 UG425: Si3474 EVB User's Guide Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics Figure 3.2. Motherboard Top silabs.com | Building a more connected world. Rev. 0.1 | 10...
  • Page 11 UG425: Si3474 EVB User's Guide Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics Figure 3.3. Motherboard USB Bridge silabs.com | Building a more connected world. Rev. 0.1 | 11...
  • Page 12: Daughtercard Schematics

    UG425: Si3474 EVB User's Guide Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics 3.2 Daughtercard Schematics Figure 3.4. DC Schematic 1 silabs.com | Building a more connected world. Rev. 0.1 | 12...
  • Page 13 UG425: Si3474 EVB User's Guide Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics Figure 3.5. DC Schematic 2 silabs.com | Building a more connected world. Rev. 0.1 | 13...
  • Page 14 UG425: Si3474 EVB User's Guide Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics Figure 3.6. DC Schematic 3 silabs.com | Building a more connected world. Rev. 0.1 | 14...
  • Page 15 UG425: Si3474 EVB User's Guide Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics Figure 3.7. DC Schematic 4 silabs.com | Building a more connected world. Rev. 0.1 | 15...
  • Page 16: Connector Board Schematic

    UG425: Si3474 EVB User's Guide Si3474 Baseboard, Daughter Board and POE_BT_CB Board Schematics 3.3 Connector Board Schematic Figure 3.8. Connector Board Schematic silabs.com | Building a more connected world. Rev. 0.1 | 16...
  • Page 17: Si3474 Bills Of Materials

    UG425: Si3474 EVB User's Guide Si3474 Bills of Materials 4. Si3474 Bills of Materials 4.1 Motherboard BOM Designator Value PCB Footprint Mfr Part Number 100 pF C0603 Venkel C0603X7R500-101K 1.5 nF C0603 Venkel C0603X7R160-152K C3, C5, C6, C7, C10, C13, C14, C16, C17, 0.1 µF C0603 Venkel...
  • Page 18 UG425: Si3474 EVB User's Guide Si3474 Bills of Materials Designator Value PCB Footprint Mfr Part Number 7.68 kΩ R0603 Venkel CR0603-16W-7681F R8, R10 10 kΩ R0603 Venkel CR0603-10W-103J 11 kΩ R0603 Venkel CR0603-16W-1102F 15 kΩ R0603 Venkel CR0603-10W-1502F 15.8 kΩ R0603 Venkel CR0603-16W-1582F...
  • Page 19: Daughtercard Bom

    UG425: Si3474 EVB User's Guide Si3474 Bills of Materials 4.2 Daughtercard BOM Designator Value PCB Footprint Mfr Part Number C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, 0.1 µF C0603 Venkel C0603X7R101-104K C13, C14 0.1 µF C0603 Venkel C0603X7R160-104M 10 µF C0603...
  • Page 20 Trademark Information Silicon Laboratories Inc.®, Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, ClockBuilder®, CMEMS®, DSPLL®, EFM®, EFM32®, EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®, Gecko®, Gecko OS, Gecko OS Studio, ISOmodem®, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, Telegesis, the Telegesis Logo®, USBXpress®...

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