MAX5971AEVKIT Maxim Integrated, MAX5971AEVKIT Datasheet - Page 4

• Manufacturer Part Number: MAX5971AEVKIT
• Description: Power Management IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX5971r

The IC features an internal triangular-wave oscillator
for AC-disconnect detection and can be bypassed
to operate in DC-disconnect detection mode. The
internal oscillator can be shut down using jumper JU6 if
AC-disconnect detection is not required.
Test points and jumpers have been provided for voltage
probing and current measurements of the power circuit.
Additionally, since the GND is more positive than VEE
or RTN, use an isolated oscilloscope when probing
signals with respect to VEE or RTN. Yellow and green
LEDs on output module J2 indicate when the port’s
power is turned on and the PoE status, respectively.
The EV kit can also be reconfigured for interfacing with-
out connecting to an Ethernet system. Banana jacks
are included for the PSE, GND, and RTN output power
sources for this method of evaluation. Since the GND
is more positive than VEE or RTN, use an isolated
oscilloscope when probing signals with respect to
VEE or RTN.
The EV kit features several jumpers to reconfigure the EV
kit for various PSE configurations, operating modes, and
PD requirements.
The EV kit features two jumpers to configure the IC’s PSE
PD classification mode and Class 0–Class 4 or high-
*Default position.
Note: Refer to the MAX5971A IC data sheet for more information on Class 0–Class 4 overcurrent and current-limit information.
*Default position.
Table 1. Jumpers JU1, JU2 Functions (ILIM1, ILIM2)
Table 2. Jumper JU3 Functions (PWMEN)
Not installed*
IC CLASSIFICATION
POSITION
Installed
SHUNT
Class 0–Class 4*
High-Power Class 5 and ILIM1/ILIM2 Selection
Class 5
Class 5
Class 5
Connected to VEE through
_________________________________________________________________ Maxim Integrated Products 4
Internally pulled high
PWMEN PIN
resistor R12
ILIM1 PIN (JU1)
Not installed
Not installed
Installed
Installed
Jumper Selection
OPERATION
LED PWM
Shutdown
Enabled
ILIM2 PIN (JU2)
Not installed
Not installed
Installed
Installed
MAX5971A Evaluation Kit
power Class 5 mode. Jumper JU1 sets the IC’s ILIM1
configuration and jumper JU2 sets the ILIM2 configura-
tion. Table 1 lists the jumper options for the modes used
to detect a valid PD connected to the PSE Ethernet out-
put port. Refer to the MAX5971A IC data sheet for more
information on all available classification modes.
The EV kit features a 2-pin jumper (JU3) to enable or
disable the IC’s internal PWM driver for the LED pin.
The IC’s LED pin also serves as a port-status indicator
using the LED driver. The RJ45 connector (J2), provid-
ing data and power at the output port, features 2 LEDs:
a yellow LED indicating that the EV kit is powered by
-54V and a green port-status LED. Table 2 lists the LED
driver jumper options and Table 3 provides the port
status. Refer to the MAX5971A IC data sheet for more
information on the multifunction LED features.
The EV kit features a 2-pin jumper (JU4) to set the IC for
midspan or end-point operation. The PSE circuit must
also be reconfigured for operating in a midspan or end-
point configuration. Table 4 lists the jumper options and
Table 5 lists the PSE circuit resistor changes for the two
configurations of operation. In Table 5, installed resistors
are 0I 1206 surface-mount components. Refer to the
MAX5971A IC data sheet for more information on the
configurations.
Table 3. Green LED Status
Midspan/End-Point PoE Selection and Configuration
Blinking 2 flashes
Blinking 5 flashes
GREEN LED
Evaluates: MAX5971A
Off
On
LED Driver PWM Enable and Port PoE Status
THRESHOLD (mA)
OVERCURRENT
Class 5 disabled
748
792
836
Detected invalid low/high discovery
Overcurrent fault during power-on
Not powered or disconnected
signature resistance
J2 PORT STATUS
Powered, valid PD
CURRENT LIMIT
Class 5 disabled
(mA)
850
900
950