MAX5945EVSYS Maxim Integrated, MAX5945EVSYS Datasheet - Page 8

• Manufacturer Part Number: MAX5945EVSYS
• Description: Power Management IC Development Tools Evaluation Kit/Evaluation System for the MAX5945
• Manufacturer: Maxim Integrated
• Series: MAX5945r

The MAX5945 EV kit features several jumpers to recon-
figure the EV kit for various PSE configurations and PD
requirements. Additionally, jumpers and PC board
pads are provided for connecting an external micro-
controller.
The MAX5945 EV kit features several 3-pin jumpers
(JU1–JU4) to set the slave address of the MAX5945
least significant bits (LSB) of the slave address on the
I
most significant bits are set by the MAX5945 to 010.
The EV kit’s software automatically sets the LSB for the
proper read/write command. Table 1 lists the jumper
addressing options.
The MAX5945 EV kit features a 3-pin jumper (JU5) to
set the MAX5945 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 respective
Ethernet network output port. Refer to the MAX5945
data sheet for more information on the modes.
MAX5945 Evaluation Kit/Evaluation System
Table 2. Jumper JU5 Functions
8
2
LOCATION
C-compatible 2-wire or 3-wire interface. The three
SHUNT
1 and 2
2 and 3
_______________________________________________________________________________________
MAX5945 I
2
Connected to DGND
through resistor R14
through resistor R14
C-Compatible 2-Wire or 3-Wire Slave
Connected to VDIG
MIDSPAN PIN
Midspan/Signal-Mode Selection
Jumper Selection
Address Selection
MAX5945 MODE
Midspan mode
Signal mode
The MAX5945 EV kit features a 3-pin jumper JU6 to set
the MAX5945’s initial startup operational mode. After
startup, data sent to the mode register (0x12) reconfig-
ure the operational mode of the MAX5945. Table 3 lists
the jumper options.
The MAX5945 EV kit features a 3-pin jumper (JU7) to
configure the MAX5945’s oscillator input at the OSC_IN
pin. The oscillator is used for AC disconnect monitoring
of the PD. Table 4 lists the jumper options for the three
oscillator configurations available on the EV kit.
Table 4. Jumper JU7 Functions
Table 3. Initial Startup Operational Mode
JU6 SHUNT
LOCATION
LOCATION
1 and 2
2 and 3
SHUNT
1 and 2
2 and 3
Operational Modes (Automatic, Shutdown)
AC Disconnect Monitoring Oscillator Input
Connected to
VDIG through
resistor R15
Connected to
DGND
through
resistor R14
AUTO PIN
Connected to the
OSC_INPUT BNC
connector
Connected to EV
kit’s on-board
100Hz oscillator
OSC_IN PIN
MAX5945
STATUS BITS
REGISTER
MODE
(0x12)
10xff
0x00
AC disconnect
detection using external
100Hz oscillator
AC disconnect
detection using EV kit
on-board 100Hz
oscillator
EV KIT MODE
OPERATION
Automatic
Shutdown
MODE