SI3454-B01-IM

Si3454 QUAD IEEE 802.3AT POE PSE CONTROLLER Features Quad-Port Power Sourcing Maskable interrupt pin Equipment (PSE) controller Comprehensive fault protection IEEE 802.3at Type I and II circuitry includes: compliant Power undervoltage lockout Output current limit and short- Port priority shutdown control circuit protection Adds enhanced features for Thermal overload detection maximum design flexibility: Supports pin-selectable Per-port current and voltage Ordering Information: AUTO mode monitoring See page 49. Extended operating temp range: PoE Plus support with programmable current limits 40 to +85 C Multi-point detection 5x7 mm 38-pin QFN package Programmable power MOSFET (RoHS-compliant) gate drive control On-chip dc-dc converter enables Configurable watchdog timer single-rail power operation enables failsafe operation Applications IEEE Power Sourcing Equipment IP Phone Systems (PSE) Smartgrid Switches Power over Ethernet (PoE) Ruggedized and Industrial Switches Switches Description The Si3454 is a fully-programmable, four-port power management controller for IEEE 802.3 compliant Power Sourcing Equipment (PSE). Designed for use in PSE endpoint (switches), the Si3454 integrates four independent ports, each with IEEE-required powered device (PD) detection and classification functionality. In addition, the Si3454 features a fully-programmable architecture that enables powered device (PD) disconnect using a dc sense algorithm, a robust multipoint detection algorithm, software-configurable per-port current and voltage monitoring, and programmable current limits to support the IEEE 802.3at standard. Intelligent protection circuitry includes input undervoltage detection, output current limit, and short-circuit protection. The Si3454 operates by 2 host processor control through a three-wire, I C-compatible serial interface. Independent serial data input and output pins enable high- voltage isolation through external isolators. An interrupt pin is used to alert the host processor of various status and fault conditions. The device also supports a pin-selectable AUTO mode for autonomous operation, without the need for a host processor. The Si3454 also features an on- chip dc-dc converter for creating the digital voltage rail from the PoE voltage, thus enabling single-rail power operation. Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice August 10, 2021 Si3454 Functional Block Diagrams VPWR MCU HVIO Detect Xn (/4) S HDN (+52V) SPI n SCL Detect HV Drive C8051 SDAI Drive SIO Control MCU Core SRAM SDAO A0 Detection MUX OTP A1 A2 A3 n INT n POR WDT Measure RESET Gate 50MHz TIMERS AUTO Measure n Drive Xn AMUX Gate PGA Drive ADC r AMUX 10 Bit 500Khz DC-DC Temp Bandgap n Sensor Controller VDD AGND V DDA DG ND CAP DC EN SWO ISE NSE SENSEn GATEn DR AINn KSE NS x VDD (+3.3V) Rsn 0.25 V DRAINn (NOTE: Only one port shown) DC-DC Converter Block Diagram VPWR VDDA 3.3V CAP 4.3V Regulator DCEN ISENSE SWO AGND The case shown has both the DC-DC converter and series regulator enabled. To enable ONLY the series regulator, tie SWO to VPWR. External components are unnecessary. 2 Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com Rev. 1.1 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice August 10, 2021 V PORTn (V VPWR) DRAINn