max5965a Maxim Integrated Products, Inc., max5965a Datasheet - Page 12

• Manufacturer Part Number: max5965a
• Description: High-power, Quad, Monolithic, Pse Controllers For Power Over Ethernet
• Manufacturer: Maxim Integrated Products, Inc.

High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
(V
T
12
A
EE
= +25°C, all registers = default setting, unless otherwise noted.)
PIN
1
2
3
4
5
= -48V, V
______________________________________________________________________________________
V
0V
0A
DETECTION WITH INVALID PD (OPEN CIRCUIT,
EE
USING TYPICAL OPERATING CIRCUIT 2)
MIDSPAN
SDAOUT
DD
RESET
NAME
SCL
INT
= +3.3V, V
40ms/div
Hardware Reset. Pull RESET low for at least 300µs to reset the device. All internal registers reset to their
default value. The address (A0–A3), and AUTO and MIDSPAN input-logic levels latch on during low-to-
high transition of RESET. RESET is internally pulled up to V
Midspan Mode Input. An internal 50kΩ pulldown resistor to DGND sets the default mode to endpoint PSE
operation (power-over-signal pairs). Pull MIDSPAN to V
latches after the device is powered up or reset (see the PD Detection section).
Open-Drain Interrupt Output. INT goes low whenever a fault condition exists. Reset the fault condition
using software or by pulling RESET low (see the Interrupt section for more information about interrupt
management).
Serial Interface Clock Line Input
Serial Output Data Line. Connect the data line optocoupler input to SDAOUT (see the Typical Operating
Circuits). Connect SDAOUT to SDAIN if using a 2-wire, I
AUTO
= V
MAX5965A toc28
AGND
V
0V
0A
EE
= V
(AGND - V
5V/div
I
1mA/div
V
10V/div
OUT
GATE_
DGND
Typical Operating Characteristics (continued)
2-EVENT CLASSIFICATION
OUT
WITH A CLASS 4 PD
= 0V, RESET = SHD_ = unconnected, R
)
MAX5965A toc30
FUNCTION
V
5V/div
I
20mA/div
V
10V/div
OUT
AGND
GATE_
DIG
2
C-compatible system.
- V
DD
to set midspan operation. The MIDSPAN value
OUT
STARTUP WITH DIFFERENT
with a 50kΩ resistor.
SENSE
PD CLASSES
= 0.5Ω, IVEE = 00, ICUT = 000,
CLASS 5
CLASS 4
CLASS 3
CLASS 2
CLASS 1
Pin Description
MAX5965A toc29
V
5V/div
0V
I
20mA/div
0A
OUT
AGND
- V
OUT