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TPS23861 IEEE 802.3At Quad Port Power-Over-Ethernet PSE

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TPS23861 IEEE 802.3At Quad Port Power-Over-Ethernet PSE Product Order Technical Tools & Support & Folder Now Documents Software Community TPS23861 SLUSBX9I –MARCH 2014–REVISED JULY 2019 TPS23861 IEEE 802.3at Quad Port Power-over-Ethernet PSE Controller 1 Features 3 Description The TPS23861 is an easy-to-use, flexible, 1• IEEE 802.3at Quad Port PSE controller IEEE802.3at PSE solution. As shipped, it – Auto Detect, classification automatically manages four 802.3at ports without the – Auto Turn-On and disconnect need for any external control. – Efficient 255-mΩ sense resistor The TPS23861 automatically detects Powered • Pin-Out enables Two-Layer PCB Devices (PDs) that have a valid signature, determines • Kelvin Current Sensing power requirements according to classification and applies power. Two-event classification is supported • 4-Point detection for type-2 PDs. The TPS23861 supports DC • Automatic mode – as shipped disconnection and the external FET architecture – No External terminal setting required allows designers to balance size, efficiency and – No Initial I2C communication required solution cost requirements. • Semi-Automatic mode – set by I2C command The unique pin-out enables 2-layer PCB designs via logical grouping and clear upper and lower – Continuous Identification and Classification differentiation of I2C and power pins. This delivers – Meets IEEE 400-ms TPON specification best-in-class thermal performance, Kelvin accuracy – Fast-Port shutdown input and low-build cost. – Operates best when used in conjunction with In addition to automatic operation, the TPS23861 system reference code supports Semi-Auto Mode via I2C control for precision http://www.ti.com/product/TPS23861/toolssoftw monitoring and intelligent power management. are Compliance with the 400-ms TPON specification is ensured whether in semi-automatic or automatic • Optional I2C control and monitoring mode. • –40°C to 125°C Temperature range • TSSOP 28 Package 9.8 mm x 6.6 mm Device Information(1) PART NUMBER PACKAGE BODY SIZE 2 Applications TPS23861 TSSOP (28) 9.80 mm x 6.60 mm • Ethernet switches and routers (1) For all available packages, see the orderable addendum at • Surveillance NVR and DVRs the end of the data sheet. • Residential gateways • PoE Pass-Through systems • Wireless backhaul TOP CONDUCTORS Simplified Schematic FETs Uniformly Spread Over Surface 3.3 V 48 V 100 nF 100 V PORTn VDD VPWR 47 RESET DRAINn SHTDWN GATEn 22 SENn TPS23861 255 m BOTTOM GND PLANE Continuous, Robust Backside GND Plane A3 KSENSx SCL INT SDAI SDAO AIN AOUT AGND DGND Note: only port n shown Copyright © 2016, Texas Instruments Incorporated 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. TPS23861 SLUSBX9I –MARCH 2014–REVISED JULY 2019 www.ti.com Table of Contents 1 Features .................................................................. 1 8.1 Introduction to PoE ................................................. 85 2 Applications ........................................................... 1 8.2 Application Information............................................ 85 3 Description ............................................................. 1 8.3 Typical Application .................................................. 87 4 Revision History..................................................... 2 8.4 System Examples ................................................... 93 5 Pin Configuration and Functions ......................... 5 9 Power Supply Recommendations...................... 97 9.1 VDD......................................................................... 97 6 Specifications......................................................... 6 9.2 VPWR ..................................................................... 97 6.1 Absolute Maximum Ratings ...................................... 6 9.3 VPWR-RESET Sequencing .................................... 97 6.2 ESD Ratings.............................................................. 6 6.3 Recommended Operating Conditions....................... 6 10 Layout................................................................... 98 6.4 Thermal Information.................................................. 6 10.1 Layout Guidelines ................................................. 98 6.5 Electrical Characteristics........................................... 7 10.2 Layout Example .................................................... 99 6.6 Timing Requirements.............................................. 11 11 Device and Documentation Support ............... 100 6.7 Switching Characteristics........................................ 12 11.1 Documentation Support ..................................... 100 6.8 Typical Characteristics............................................ 16 11.2 Receiving Notification of Documentation Updates.................................................................. 100 7 Detailed Description ............................................ 21 11.3 Community Resources........................................ 100 7.1 Overview ................................................................. 21 11.4 Trademarks ......................................................... 100 7.2 Functional Block Diagram ....................................... 25 11.5 Electrostatic Discharge Caution.......................... 100 7.3 Feature Description................................................. 25 11.6 Glossary .............................................................. 100 7.4 Device Functional Modes........................................ 40 12 Mechanical, Packaging, and Orderable 7.5 Register Map – I2C-Addressable ............................ 45 Information ......................................................... 100 8 Application and Implementation ........................ 85 4 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision H (November 2017) to Revision I Page • Added figure titles to the Application Curves........................................................................................................................ 92 Changes from Revision G (October 2016) to Revision H Page • Deleted "or unknown" from Auto subsection ........................................................................................................................ 42 • Deleted "and Auto Modes" from TSTART Indicators of Detect and Class Failures subsection........................................... 44 • Changed fault conditions for Auto mode in Detect and Class Failure Indicators table ........................................................ 44 • Added information to Step 2 in Start/ILIM Event Register subsection ................................................................................. 53 Changes from Revision F (July 2016) to Revision G Page • Deleted the MAX value of 150 mA from IGO- in the Electrical Characteristics ........................................................................ 8 Changes from Revision E (March 2016) to Revision F Page • Legacy Device Detection, Changed the paragraph, "in general,..." ..................................................................................... 30 • Changed section From: Independent Operation when the Bit is Set To: Independent Operation when the AUTO Bit is Set..................................................................................................................................................................................... 34 • I2C Slave Address and AUTO Bit Programming, Added NOTE: "When using I2C scan...".................................................. 37 • Start/ILIM Event Register, Changed the third list item From: "Detect fault or classification unknown,.." To: "Overcurrent or class mismatch on second finger in Semi-Auto or Manual Mode." ........................................................... 53 • Timing Configuration Register, Added new NOTE under TLIM[1:0]: " If ILIM and ICUT are set to same value..." ............ 61 • Timing Configuration Register, Added new NOTE under TICUT[1:0]: " If ILIM and ICUT are set to same value..." .......... 62 • Two-Event Classification Register, Changed the second list item to include: "CLEn is set or a" ....................................... 67 2 Submit Documentation Feedback Copyright © 2014–2019, Texas Instruments Incorporated Product Folder Links: TPS23861 TPS23861 www.ti.com SLUSBX9I –MARCH 2014–REVISED JULY 2019 • Replaced Figure 58 .............................................................................................................................................................. 95 Changes from Revision D (September 2015) to Revision E Page • Added note in Features, "Semi-Automatic Mode " ................................................................................................................. 1 • Updated Pin Functions table .................................................................................................................................................. 5 • Added new Figure 37 .......................................................................................................................................................... 22 • Added new Functional Block Diagram.................................................................................................................................. 25 • Changed note in A/D Converter and I2C Interface .............................................................................................................
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