PDF Si3452 Data sheet ( Hoja de datos )

Número de pieza	Si3452
Descripción	QUAD HIGH-VOLTAGE PORT CONTROLLER
Fabricantes	Silicon Laboratories
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No Preview Available ! Si3452 QUAD HIGH-VOLTAGE PORT CONTROLLER FOR POE AND POE+ PSES Features  Each Si3452 high-voltage port  Programmable architecture supports controller supports four PSE power IEEE 802.3af (PoE) and IEEE interfaces 802.3at (PoE+) PSEs  Programmable current limits for PoE Programmable current limits for (15.4 W), PoE+ (30 W), and PoE (350 mA) and PoE+ proprietary systems (up to 40 W) per (600 mA), and custom limits to port 850 mA  I2C interface requires no external Per-port current and voltage MCU for easy, low-cost management monitoring for sophisticated power of 4 to 48 ports by the host system management and control  Unique mixed-signal IC high-voltage Power policing mode component integration simplifies Robust multi-point detection design, lowers power dissipation, Supports 1-Event and 2-Event minimizes external BOM, and classification algorithms reduces PCB footprint  Comprehensive, robust, fault- Internal low-RON power FETs with current-sense circuitry Integrated transient voltage surge suppressors protection circuitry Supply undervoltage lockout (UVLO) Output current limit and short- Proprietary dV/dt disconnect sensing methods  Industrial (–40 to 85 °C) operating temperature  Compact, 6×6 mm2, 40-pin QFN RoHS-compliant package circuit protection Foldback current limiting Dual-threshold thermal overload protection Fault source reporting for intelligent port management Applications  Power over Ethernet Endpoint  Industrial automation systems switches and Midspans for IEEE Std  Networked audio 802.3af and 802.3at  IP Phone Systems and iPBXs  Supports high-power PDs, such as:  Metropolitan area networked WAPs, Pan/Tilt/Zoom security cameras cameras, and sensors 802.11n WAPs  WiMAX ASN/BTS and CPE/ODU Multi-band, multi-radio WAPs systems  Security and RFID systems Ordering Information: See page 31. Pin Assignments 40-Pin QFN VEE1 1 VEE 2 VREF 3 AIN 4 AOUT 5 AGND 6 RBIAS 7 AGND 8 NC 9 VEE4 10 Si3452 (Top View) 30 VDD 29 DGND 28 AD0 27 AD1 26 AD2 25 AD2 24 AD3 23 RST 22 VEE3 21 AD3 See "9. Pin Descriptions" on page 28. Rev. 1.5 1/15 Copyright © 2015 by Silicon Laboratories Si3452 1 page Si3452 Table 2. Recommended Operating Conditions Description Symbol Test Condition Min Typ Max Unit Ambient Operating Temperature TA –40 — 85 °C Thermal Impedance* θJA No airflow 1 m/s airflow — 32 — °C/W — 28 — Power Supply Voltages VEE Supply Voltage For IEEE 802.3af (15.4 W) apps. –57 –48 –45 V VEE For IEEE 802.3at (30 W) apps. –57 –54 –51 VDD Supply Voltage Power Supply Currents VDD 3.0 3.3 3.6 V VEE Supply Current All ports on, excluding load current. — 3.7 6.0 IEE mA All ports in shutdown mode —1 2 VDD Supply Current IDD — 8 14 mA Note: Modeled with six parts evenly spaced on a 30 x 120 mm2, four-layer board with 25 thermal vias to a Vneg plane on the back. Table 3. UVLO, and Reset Specifications Description Symbol Test Condition Min Typ Max Unit VDD Reset Threshold VDD Power-On Ramp RST Input High Voltage RST Input Low Voltage RST Input Leakage VRST Ramp from 0 V to 3.0 V RST = 0 V — 1.75 —— 0.7 x VDD — — — —— — 1 — 0.8 40 V ms V V μA Reset Time Delay TRSTDLY Time between end of reset and beginning of normal operation — — 100 ms Reset Assertion Time TRST RST low time to generate system reset 15 — — μs VEE Monitor Accuracy VEE UVLO Threshold VEEMON VUVLO Measured VEE relative to actual VEE for VEE (–44 to –57 V) Point at which VEE UVLO is declared. VEE going negative VEE going positive –4 — –38 –36 — –33 4 — –31 % V *Note: If VDD ramp time is slower than 1 ms, hold the reset pins low until VDD is above 3.0 V to insure proper reset operation. Rev. 1.5 5 5 Page 2. PSE System-Level Diagrams Si3452 Host Controller I2C SDA SCL INT Si8405 Digital Isolator RST PSE State Machines I2C and Measurement Subsystem OTP RAM Mixed Signal Resources Si3452 Figure 2. 4-Port System with Direct Host Connection 3. PSE Application Diagrams Host / Switch Si8405 Bidirectional Isolator 1.1 V (e.g. TLV431) +3.3 V 4x10 k Tie high or low to select address AD0 AD1 AD2 AD3 SCL SDA INT RST VREF VDD AGND DGND GND12/34 Si3452 DET4 DET3 DET2 DET1 RBIAS 44.2 k 1% VEE VEE[4:1] VOUT4 VOUT3 VOUT2 VOUT1 –54 V PORT1 PORT2 PORT3 PORT4 Figure 3. 4-Port Application Diagram Using dV/dt Disconnect and I2C Host Interface Rev. 1.5 11 11 Page

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