Maxim MAX5971B Instruction Manual

The MAX5971B evaluation kit (EV kit) is a fully assembled
and tested surface-mount PCB featuring an Ethernet
single-port power-sourcing equipment (PSE) circuit for
-54V supply rail systems. The IEEE
MAX5971B PSE controller IC, in a 28-pin TQFN package,
features an internal n-channel power MOSFET forming
the main PSE circuit on the EV kit. The IC is used in
single-port power-over-Ethernet (PoE) applications.
The EV kit provides optical isolation for the IC's I
compatible 2-wire interface. The isolated interface can
connect to a PC's USB port through an on-board
USB interface circuit. The EV kit can be reconfigured
for interfacing to a user's stand-alone microcontroller
for isolated or nonisolated operation. In stand-alone
operation, the user must supply a separate +3.3V
power supply capable of supplying 35mA. The EV
kit requires a -32V to -60V power supply (-54V sup-
ply rail) capable of supplying 1A or more to the EV
kit for powering the powered device (PD) through the
10/100/1000BASE-TX Ethernet network port. The EV
kit demonstrates PD discovery, classification, current-
limit control, and other functions of an IEEE 802.3af/at-
compliant PSE.
The IC controls the -54V DC power to the Ethernet net-
work port by sensing current through the port and con-
trolling the IC's internal power MOSFET. Current is fed
to a 1Gb x 1Gb MagJack
The EV kit demonstrates the full functionality of the IC,
such as configurable operational modes, port current
information through the I
(programmable up to 40W), PD detection (including
legacy PD detection), PD classification, overcurrent
protection, current foldback, undervoltage/overvoltage
protection, and AC-/DC-disconnect monitoring. All these
features are configurable on the EV kit, with additional
test points for voltage probing and current measure-
ments provided. The EV kit can also be configured for
midspan or end-point network operation. The EV kit soft-
ware is Windows
Vista compatible, providing a user-friendly interface
M
to demonstrate the IC features while providing access
to each register at the bit level. The program is menu
driven, offers a graphical user interface (GUI) with con-
trol buttons, and includes a macro engine for automated
evaluation and testing of the IC at the system level. The
program's macro output files can be automatically saved.
Order the EV kit for a complete PC-based evaluation
of the IC. To evaluate the MAX5971A IC, order the
MAX5971A EV kit.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
Downloaded from Elcodis.com electronic components distributor
General Description
802.3af/at-compliant
M
module Ethernet output port.
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2 C interface, high-power modes
2000, Windows XP , and Windows
M M
_________________________________________________________________ Maxim Integrated Products 1
MAX5971B Evaluation Kit
Evaluates: MAX5971B
IEEE 802.3af/at-Compliant PSE Circuit
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Port Current Read-Out Through I
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High-Power Class 5 Mode Configurable Up to 40W
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-32V to -60V Input Voltage Providing 1A
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Ethernet Network Ports
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RJ45 10/100/1000BASE-TX Ethernet Network
Data Input Port
2 C-
RJ45 10/100/1000BASE-TX Ethernet Network
PSE Output Port
Demonstrates MAX5971B Internal Power Switch
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and Current Sensing
Demonstrates Standard and Legacy PD Detection
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and Classification
Configurable for Midspan or End-Point Mode
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Configurable AC/DC Load-Removal Detection and
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Disconnect Monitoring
Convenient Voltage and Current Test Points
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Demonstrates IC's Output-Port LED Status
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Indicators
Optically Isolated I
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Interface
Reconfigurable for Stand-Alone Operation or with
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an External Microcontroller (Requires +3.3V, 35mA
Supply)
Windows 2000-, Windows XP-, and Windows Vista
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(32-Bit)-Compatible Software
Proven PCB Layout
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Fully Assembled and Tested
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Ordering Information
IEEE is a registered service mark of the Institute of Electrical
and Electronics Engineers, Inc.
MagJack is a registered trademark of Bel Fuse Inc.
Windows, Windows XP, and Windows Vista are registered
trademarks of Microsoft Corp.
19-5783; Rev 0; 3/11
Features
2 C Interface
2 C-Compatible 2-Wire PC
appears at end of data sheet.