MAX5945EVKIT Maxim Integrated, MAX5945EVKIT Datasheet - Page 5

• Manufacturer Part Number: MAX5945EVKIT
• Description: Power Management IC Development Tools Evaluation Kit/Evaluation System for the MAX5945
• Manufacturer: Maxim Integrated
• Series: MAX5945r

13) Connect the MAX5945 EV kit’s network input LAN
port to the corresponding PD LAN connection as listed
below:
• PORT1_IN at J3
• PORT2_IN at J4
• PORT3_IN at J5
• PORT4_IN at J6
14) Connect the computer’s parallel port to the
15) Install the MAX5945 evaluation software on your com-
16) Turn on all four power supplies.
17) Start the MAX5945 program by opening its icon in
18) Observe as the program automatically detects the
19) Load and run the Power_on.smb macro program
20) All four network port green status LEDs should light.
21) Four other example macros allow quick testing of the
• test#1_manual_mode.smb
• test#2_auto_mode_dc.smb
• test#3_auto_mode_dc.smb
• test#4_semiauto_mode.smb
22) Pressing pushbutton switches S1 through S4 shuts
for detailed descriptions using a plain text editor.
Please read the embedded comments in each macro
MAXSMBus interface board. Use the straight-
through 25-pin female-to-male cable. The EV kit
software uses a loopback connection to confirm
that the correct port is selected.
puter by running the INSTALL.EXE program on the
CD-ROM disk. The program files are copied and icons
are created for them in the Windows Start Menu.
Restart the computer when prompted. For Windows
2000, you may need administrator privileges.
the Start Menu.
parallel port connected to the MAXSMBus, starts
the main program, and then automatically detects
the I
MAX5945.
from the File|Open|Run Macro menu. The script
automatically runs after selecting open.
manual mode, auto mode, semiauto mode, and with
DC and/or AC load disconnect detection. These
macros are:
down PORT1_OUT through PORT4_OUT’s respec-
tive DC power.
2
C-compliant address configured for the
MAX5945 Evaluation Kit/Evaluation System
_______________________________________________________________________________________
23) Test points TP3 (U1 V
24) Header J2 is provided to monitor the
25) Pressing the RESET pushbutton turns off power to
Note: An uninstall program is included with the soft-
ware. Click on the UNINSTALL icon to remove the EV
kit software from the hard drive.
The MAX5945 EV kit features a 10/100 base-TX
Ethernet four-port network power controller circuit for
-48V supply rail systems. The EV kit’s PSE circuit uses
the IEEE 802.3af-compliant MAX5945 network power
controller, four n-channel power MOSFETs in SOT-223
surface-mount packages, four surface-mount current-
sensing resistors and two 10/100 base-TX VoIP mag-
netic modules to form the basic portion of a PSE circuit.
The MAX5945 EV kit has been designed as an IEEE
802.3af-compliant PSE and demonstrates all the
required functions such as PD discovery, classification,
current-limit control of a connected PD at each Ethernet
output port, and DC/AC disconnect detection. The EV
kit also has a separate on-board, 100Hz sine-wave
oscillator circuit for the AC disconnect detection fea-
tures. An IBM-compatible PC is used to communicate
with the slave MAX5945 over an I
interface, optically coupled logic, and a 2-wire to
parallel port (LPT) MAXSMBus interface board.
The MAX5945 EV kit PSE circuit requires a -32V to -60V
power supply (-48V supply rail) capable of supplying
2A to the EV kit’s GND and VEE steel banana jacks or
PC board pads. Two separate +3.3V power supplies
capable of supplying 100mA are also required for the
MAX5945 digital logic (VDIG, DGND) and optically iso-
lated I
and GND are shorted by a PC board trace between
the pads of resistor R72.
The MAX5945 controls the -48V DC power to each of
the four 10/100 base-TX Ethernet network output ports
by regulating the respective port’s n-channel power
provided throughout the PC board to observe desired
signals with an oscilloscope or voltage meter.
nals. These signals are not isolated and are refer-
enced to the DGND. DGND and GND are shorted
by a PC board trace between the pads of resis-
tor R72.
all ports and returns the MAX5945 IC to the power-
up condition.
2
C-compliant 3-wire interface. Note that DGND
Detailed Description
EE
pin) and GND test points are
2
of Hardware
C-compliant 3-wire
SHDN pin sig-
5