PDF SI3483 Data sheet ( Hoja de datos )

Número de pieza	SI3483
Descripción	POWER MANAGEMENT CONTROLLER
Fabricantes	Silicon Laboratories
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Si3483 POWER MANAGEMENT CONTROLLER Features  Enables use of smaller power  Supports classification-based and supplies for up to 64-port PoE LLDP power negotiation systems with Si3459 and Si3454  Supports individual port priority and PSE interface ICs port configuration  Can operate with or without a host  Supports Power supply status from  Configuration save capability up to 3 power supplies  Pin-selectable SPI or UART interface 24-pin Quad flat pack package  Pin-selectable UART data rate 4x4 mm PCB footprint; RoHS  Fully-compliant with IEEE 802.3-AT complaint Types I and II  Extended temperature operating range (–40 to +85 °C) Applications  Power over Ethernet Endpoint  Industrial automation systems switches and Midspans  Networked audio  Supports high-power PDs, such as:  IP Phone Systems and iPBXs Pan/Tilt/Zoom security cameras Wireless Access Points Security and RFID systems Description The Si3483 is a power manager intended for use with the Si3459 Power over Ethernet (PoE) controllers for power management of up to 64 ports with three power sources. The Si3459 is capable of delivering over 30 W per port, which means that, in a 24- or 48-port system, a very large power supply would have to be used to avoid overload. Typically, not all ports are used at full power; so, a smaller power supply can be used along with the Si3483 power management controller. Use of the Si3483 power manager greatly simplifies system implementation of power management. The Si3483 power management controller is programmed via a SPI or UART interface to set the system power supply capacity, the port power configuration (Type 1: 15.4 W, or high-power Type 2: 30 W) ports, the port priority, the detection timing (Alternative A or Alternative B), and the fault recovery protocol. Once programmed, the configuration data can be saved, and the Si3483 can work without host intervention. Port and overall status information is available and continuously updated. The Si3483 uses the real-time overload and current monitoring capability of the Si3459 to manage power shared among up to 64 ports. Power management is selectable between grant-based or consumption-based algorithms in order to supply power to the greatest number of ports. In high-reliability systems, multiple power supplies are often connected to provide redundancy, which further increases the power supply monitoring requirements. The Si3483 can manage up to three power supplies automatically, enabling or disabling ports in priority order. Pin Assignments 24-Pin QFN MISO 1 SCK 2 GND 3 VDD 4 RST 5 RSVD 6 Top View (Pads on Bottom of Package) 18 SDA 17 SCL 16 BAUD0 15 BAUD1 14 BAUD2 13 PSLCT See "5. Pin Descriptions" on page 43. Confidential Rev. 1.1 6/15 Copyright © 2015 by Silicon Laboratories Si3483 1 page Table 4. Timing Requirements Parameter SPI Timing Requirements (See Figure 1) NSS Falling to First SCK Edge Last SCK Edge to NSS Rising NSS Falling to MISO Valid NSS Rising to MISO High Z SCK High Time SCK Low Time MOSI Valid to SCK Sample Edge SCK Sample Edge to MOSI Change SCK Shift Edge to MISO Change Maximum SPI Clock Speed UART Requirements (See Figure 2) Deviation of Tx Transmit Speed from Pin-programmed Value Deviation of Rx receive Speed from Pin-programmed Value Symbol TSE TSD TSEZ TSDZ TCKH TCKL TSIS TSIH TSCH FMAX ∆FTx ∆FRx Min 84 84 — — 210 210 84 84 — — –3 –4 Si3483 Max — — 168 168 — — — — 168 1 +3 +4 Unit ns ns ns ns ns ns ns ns ns MHz % % TSE TCKH TCKL TSD SCK MOSI MISO TSEZ NSS TSIH MSB Bit 6 TSIS MSB Bit 6 Bit 5 Bit 4 Bit 3 Bit 5 Bit 4 TSCH Bit 3 Bit 2 Bit 1 Bit 2 Bit 1 Bit 0 Bit 0 TSDZ Figure 1. SPI Timing Diagram MARK SPACE START BIT D0 D1 D2 D3 D4 D5 D6 D7 BIT TIMES BIT SAMPLING Figure 2. UART Timing Diagram STOP BIT Confidential Rev. 1.1 5 5 Page Si3483 the RTN_GETSYSTEMINFO, RTN_GETPORTINFO, and RTN_GETEVENTS routines. The Data Fields for these return packets are in the System Information format, Port Information format, and Events format, respectively. 3.1.5.1. Parameters Format The Parameters format of the Data field is used to pass parameters to Power Manager routines. In most cases, the Parameters format is also used to return data from the routines. Start Routine Data Length Data Checksum Parm8 Parm32 Figure 9. Parameters Format The Parameters format has an 8-bit Parm8 field followed by a 32-bit Parm32 field (see Table 6). Depending on the routine being called, Parm8, Parm32, or both fields are used. Sometimes, neither field is used. However, both fields are always sent and received. The DataLength field contains five. Table 6. Use of Parameters Routine Parameters in Query Packet Parm8 Parm32* Parameters in Reply Packet Parm8 Parm32* Get System Status SystemStatus Get System Info Uses System Information Format Get Total Power Consumed PowerConsumed Get Total Power Granted PowerGranted Get Total Power Provided PowerProvided Get Port Count PortCount Get Port Status Port PortStatus Get Port Info Port Uses Port Information Format Get Port Priority Status Port PortPriorityStatus Get Port Power Consumed Port PowerConsumed Get Port Power Granted Port PowerGranted Get Port Power Requested Port PowerRequested Get Port Power Available Port PowerAvailable Reset System Result Restore Factory Defaults Store Configuration Set Port Control Port Control Result Adjust Port Power Port PortPower Result Set Power Provided PowerSupply PowerProvided Result *Note: The Parm32 field is big endian; therefore, the most significant byte is first. Confidential Rev. 1.1 11 11 Page

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