MAX5971BEVKIT+ Maxim Integrated, MAX5971BEVKIT+ Datasheet - Page 13

• Manufacturer Part Number: MAX5971BEVKIT+
• Description: Power Management IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX5971r

Specifications of MAX5971BEVKIT+

• Rohs: yes

The EV kit features a 2-pin jumper (JU6) to disable the
IC’s internal triangular-wave oscillator at the OSC pin.
The oscillator is used for AC-disconnect monitoring of
the PD and is disabled for DC-disconnect operation.
For AC-disconnect operation, the internal oscillator is
used along with RCD components R3, C4 and D3, and
blocking-diode D4. Perform a power-on or reset the IC
using switch SW1 to effect the changes.
For DC-disconnect operation, shut down the internal
oscillator by installing a shunt on jumper JU6. Then
remove resistor R3 and install a 0I 0402 surface-mount
resistor on the R9 pads to bypass blocking-diode D4.
Diode D3 remains installed. Refer to the AC Disconnect
Monitoring and DC Disconnect Monitoring sections in
the MAX5971B IC data sheet for additional information.
Table 7 lists the jumper options for the oscillator and AC/
DC configurations. Refer to the MAX5971B IC data sheet
for more information.
The EV kit features switch SW1 to reset the IC or set
the IC’s initial startup operational mode to auto mode.
Semiautomatic and manual modes can only be accessed
through their respective register using software. Refer
to the MAX5971B IC data sheet for more information.
Table 8 lists the switch options.
The EV kit features a 2-pin jumper (JU7) to set the slave
address to one of four addresses: 0x40, 0x42, 0x44, or
0x46 of the slave address on the I
interface. Global address 0x60 is accepted by the IC
regardless of the jumper settings. The EV kit’s software
automatically sets the LSB for the proper read/write
command. Table 9 lists the jumper addressing options.
The EV kit features PCB pads and a jumper to interface
directly with a microcontroller. The 8-pin (2 x 4) jumper
(JU8) has shorting connections on the bottom layer
that must be cut open to disable the optical coupler
interface for nonisolated evaluation. The jumper shorting
connections must be in place for evaluating an isolated
stand-alone microcontroller interface. Table 10 lists the
selectable jumper options.
I
2
C-Compatible 2-Wire Slave address Selection
AC-Disconnect Monitoring Oscillator and
Reset/Shutdown and Automatic Modes
Stand-Alone Microcontroller Interface
________________________________________________________________ Maxim Integrated Products 13
AC-/DC-Disconnect Operation
(Isolated/Nonisolated)
2
C-compatible 2-wire
The 10/100/1000BASE-TX magnetic output module RJ45
jack (J2) is rated for up to 700mA of current and cannot
be used for PSE operation at greater than 35W power.
The EV kit features PCB pads and banana jacks to
interface directly with the EV kit’s output port power when
operating at 35W or more. Use the GND and RTN PCB
pads or jacks to access the output port’s power without
an Ethernet connection.
The EV kit’s on-board +3.3V linear regulator circuit
can be reconfigured to operate the EV kit circuit with
an externally supplied +3.3V DC source. The EV kit’s
on-board linear regulator (U2) must be disabled and
several components reconfigured to operate the EV kit
with an externally supplied +3.3V source as follows:
• Cut open the shorting traces on resistors R31 and R32
• Connect the external +3.3V ground terminal to the
• Connect the external supply positive to the 3_3V test
The externally supplied +3.3V DC source must be able to
supply 50mA of current or more.
The EV kit features test points to facilitate voltage
measuring at the ports’ respective LED, ILIM1, ILIM2,
PWMEN, MIDSPAN, LEGACY, and EN pin signals of the
IC. For the VEE connection, test points TP11 and TP13
can be used.
The output port current can be measured by replacing
any output port single resistor (R5 or R6) when operating
in midspan, or when operating in end point (R7 or R8).
Replace the respective resistor with a 1I Q1% 1206
surface-mount resistor.
The EV kit’s J2 port green LED status indicator is
configured to operate from the -54V supply. Alternatively,
the green LED status indicator can be reconfigured to
operate off the on-board +3.3V linear regulator circuit. To
evaluate this mode of operation, two components on the
EV kit must be reconfigured as follows:
• Remove resistor R29.
• Install a 200I 0805 surface-mount resistor at R30.
pads.
VEE PCB pad or VEE test point (TP13 or TP11).
point (TP12).
Evaluates: MAX5971B
35W or More Power Operation Without
J2 Port LED Status +3.3V Operation
IC Pins’ Signal Measurements
External +3.3V Operation
an Ethernet Connection