Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsDev KitsPCB design board

MAX5980 Evaluation Kit

Evaluates: MAX5980

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-6430; Rev 0; 8/12

General Description

The MAX5980 evaluation kit (EV kit) is a fully assembled

and tested surface-mount circuit board featuring an

Ethernet 4-port power-sourcing equipment (PSE) circuit

for -48V or -54V supply rail systems. The IEEE

802.3af/

at-compliant MAX5980 PSE controller, in a 32-pin TQFN-

EP package, and four n-channel power MOSFETs are

used to form the main PSE circuit on the EV kit. The IC is

used in Power-over-Ethernet (PoE) applications requiring

DC power over four Ethernet network ports. The EV kit

provides optical isolation for the I

C-compatible 3-wire

interface. The isolated interface can connect to a PC’s

USB port through an on-board USB interface circuit.

The EV kit can easily be reconfigured for interfacing to a

user’s stand-alone microcontroller for isolated or noniso-

lated operation. In stand-alone operation, the user must

supply a separate 3.3V power supply (with respect to

VEE) capable of supplying 100mA for the EV kit’s +3.3V

optically isolated 3-wire interface.

The EV kit requires a -32V to -60V power supply

(-48V/-54V supply rail) capable of supplying 4A or more

to the EV kit for powering the powered device (PD)

through the four 10/100/1000BASE-TX Ethernet network

ports. The EV kit demonstrates PD discovery, classifica-

tion, current-limit control, and other functions of an IEEE

802.3af/at-compliant PSE circuit.

The IC controls the -48V/-54V DC power to each of the

four Ethernet network ports by controlling the ports’

power MOSFET and sensing current through the respec-

tive port’s current-sense resistor. The current is fed to a

10/100/1000BASE-TX magnetic module at each Ethernet

output port. The EV kit provides a separate, independent

power channel for each of the four Ethernet output ports.

The EV kit demonstrates the full functionality of the IC for

each power channel, such as configurable operational

modes, high-power mode (programmable up to 30W per

port or up to 60W in a 2 x 2 pair configuration), port cur-

rent information through the I

C interface, PD detection,

PD classification, overcurrent protection, current fold-

back, under/overvoltage protection, and DC disconnect

monitoring. All these features are configurable on the EV

kit. Additional test points for voltage probing and current

measurements have also been provided.

The EV kit includes Windows XP

-, Windows Vista

and Windows

7-compatible software and provides a

user-friendly interface to demonstrate the features of the

IC, while also providing access to each register at the bit

level. The program is menu-driven and offers a graphical

user interface (GUI) with control buttons. The program also

includes a macro engine to allow automated evaluation

and testing of the IC at the system level. The program’s

macro output files can be automatically saved.

Features

S IEEE 802.3af/at-Compliant PSE Circuit

High-Power Mode (Programmable Up to 30W per

Port or Up to 60W in a 2 x 2 Pair Configuration)

S Port Current Readout Through the I

C Interface

Input Voltages



-32V to -60V Providing 4A (-48V/-54V Power

Circuit, 1A/Port)

Ethernet Network Ports



Four RJ45 10/100/1000BASE-TX Ethernet

Network Input Ports

 Four RJ45 10/100/1000BASE-TX Ethernet

Network Output PoE Ports

S Demonstrates Four Separate Independent Power

Switch Controllers

S Demonstrates PD Detection and Classification

DC Load Removal Detection and Disconnect

Monitoring

S Convenient Voltage and Current Test Points

Four Output-Port LED Status Indicators

Optically Isolated I

C-Compatible 3-Wire PC

Interface

S Reconfigurable for Stand-Alone Operation or with

an External Microcontroller (Requires a +3.3V,

100mA Supply)

Windows XP-, Windows Vista-, and Windows

7-Compatible Software

S Proven PCB Layout

Fully Assembled and Tested

Ordering Information appears at end of data sheet.

IEEE is a registered service mark of the Institute of Electrical

and Electronics Engineers, Inc.

Windows, Windows XP, and Windows Vista are registered

trademarks and registered service marks of Microsoft

Corporation.

Summary of content (28 pages)

PAGE 1
MAX5980 Evaluation Kit Evaluates: MAX5980 General Description The MAX5980 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring an Ethernet 4-port power-sourcing equipment (PSE) circuit for -48V or -54V supply rail systems. The IEEEM 802.3af/ at-compliant MAX5980 PSE controller, in a 32-pin TQFNEP package, and four n-channel power MOSFETs are used to form the main PSE circuit on the EV kit.
PAGE 2
MAX5980 Evaluation Kit Evaluates: MAX5980 Component List DESIGNATION QTY C1 1 220FF Q20%, 100V electrolytic capacitor (18 x 16.5) Panasonic EEVFK2A221M 2 1FF Q10%, 10V X5R ceramic capacitors (0603) Murata GRM188R61A105K 1 1FF Q10%, 100V X7R ceramic capacitor (1210) AVX 12101C105KAT9A C7 1 1000pF Q10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H102K C8 1 10FF Q20%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J106M C9 1 0.
PAGE 3
MAX5980 Evaluation Kit Evaluates: MAX5980 Component List (continued) DESIGNATION QTY R16, R19, R26, R28, R31, R34, R201 7 R25, R33, R36, R57 DESCRIPTION DESIGNATION QTY 0I Q5% resistors (0603) U10 1 High-voltage linear regulator (6 TDFN-EP*) Maxim MAX6765TTSD2+T 0 Not installed, resistors (0603) 2kI Q5% recommended U201 1 32-bit microcontroller (68 QFN-EP*) Maxim MAXQ2000-RAX+ U202 1 93C46 type 3-wire EEPROM (8 SO) U203 1 UART-to-USB converter (32 TQFP, 7mm x 7mm) U204 1 3.
PAGE 4
MAX5980 Evaluation Kit Evaluates: MAX5980 and JU4 (A4, high) to set the IC’s I2C-compatible slave address to 0x5E hexadecimal. MAX5980 EV Kit Files FILE DESCRIPTION INSTALL.EXE Installs the EV kit files on your computer MAX5980.EXE Application program FTD2XX.INF USB device driver file POWER_ON.SMB Bitmap macro routine TEST#1_MANUAL_MODE.SMB Bitmap macro routine TEST#2_AUTO_MODE_DC.SMB Bitmap macro routine TEST#3_AUTO_MODE_AC.SMB Bitmap macro routine TEST#4_SEMIAUTO_MODE.
PAGE 5
MAX5980 Evaluation Kit Evaluates: MAX5980 13) Start the EV kit software by opening its icon in the Start | Programs menu. 14) Observe as the program automatically detects the USB interface circuit, starts the main program, and then automatically detects the I2C-compatible address configured for the IC. 15) Select the BitMap Controls tab at the top. 16) Load and run the POWER_ON.SMB macro program from the File | Open | Run Macro menu. The script automatically runs after selecting open.
PAGE 6
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 1.
PAGE 7
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 2.
PAGE 8
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 3.
PAGE 9
MAX5980 Evaluation Kit Evaluates: MAX5980 Auto Read/Run Macro State Controls When the Auto Read checkbox in the Startup State group box is checked, the program continuously updates the main window registers and operates in the auto read state. In the auto read state, data can be written to the IC by entering or selecting the desired data in the Reg Adrs and the Hex Data or Bin Data combo boxes. Pressing the Write Byte button writes the combo box data to the IC.
PAGE 10
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 4. Advanced User Interface (2-Wire Interface) General Troubleshooting Problem: Software reports it cannot find the USB interface circuit. • Is the USB interface circuit power LED D201 lit? • Is the USB communications cable connected? • Has Windows plug-and-play detected the board? Bring up Control Panel System | Device Manager, and look at what device nodes are indicated for the USB.
PAGE 11
MAX5980 Evaluation Kit Evaluates: MAX5980 The EV kit PSE circuit requires a -32 to -60V power supply (-48V/-54V supply rail) capable of supplying 4A to the EV kit’s GND and VEE steel banana jacks or PCB pads. A separate +3.3V power supply capable of supplying 100mA is also required for the IC’s optically isolated I2Ccompatible 2-wire interface if the USB interface circuit is not used. Note: The DGND and VEE are shorted by a 0I resistor (R19). AGND and GND are shorted by a 0I resistor (R68).
PAGE 12
MAX5980 Evaluation Kit Evaluates: MAX5980 Table 1.
PAGE 13
MAX5980 Evaluation Kit Evaluates: MAX5980 Mode Selection (Midspan or Signal) The EV kit features a 3-pin jumper (JU5) to set the IC in midspan or signal mode. Table 2 lists the jumper options for the two modes used to detect a valid PD connected to the PSE’s respective Ethernet output port. Refer to the MAX5980 IC data sheet for more information on these modes. Operational Modes (Automatic and Shutdown) The EV kit features a 3-pin jumper (JU6) to set the IC’s initial startup operational mode.
PAGE 14
MAX5980 Evaluation Kit Evaluates: MAX5980 Table 5. Jumper JU9 and Microcontroller PCB Pad Functions SHUNT POSITION ISOLATION MODE 1-2 (Shorted*) Isolated OPTO_VCC PCB pad connects to the microcontroller’s +3.3V power supply. 3-4 (Shorted*) Isolated OPTO_SCL_IN PCB pad connects to the microcontroller’s serial-clock line. 5-6 (Shorted*) Isolated OPTO_SDA PCB pad connects to the microcontroller’s SDA data line.
PAGE 15
MAX5980 Evaluation Kit Evaluates: MAX5980 EN Signal The EV kit features a pushbutton switch (S1) to enable or disable the IC. Ethernet Optional PHY-Side Ethernet Connections The EV kit includes jumpers JU35–JU38 for a user to use the optional PHY-side Ethernet connections (GND_P1, GND_P2, GND_P3, and GND_P4; VCC_P1, VCC_P2, VCC_P3, and VCC_P4). PCB pads are provided for connecting an external VCC power supply. See J2 in the Component List for specific connections.
PAGE 16
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 5a.
PAGE 17
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 5b.
PAGE 18
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 5c.
PAGE 19
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 5d. MAX5980 EV Kit Schematic (3.
PAGE 20
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 5e.
PAGE 21
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 6.
PAGE 22
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 7.
PAGE 23
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 8.
PAGE 24
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 9. MAX5980 EV Kit PCB Layout—GND/OPTO_VCC/+3.
PAGE 25
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 10.
PAGE 26
MAX5980 Evaluation Kit Evaluates: MAX5980 Figure 11.
PAGE 27
MAX5980 Evaluation Kit Evaluates: MAX5980 Ordering Information PART TYPE MAX5980EVKIT# EV KIT #Denotes RoHS compliant.
PAGE 28
MAX5980 Evaluation Kit Evaluates: MAX5980 Revision History REVISION NUMBER REVISION DATE 0 8/12 DESCRIPTION Initial release PAGES CHANGED — Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.