MAX5952AEAX+ Maxim Integrated Products, MAX5952AEAX+ Datasheet - Page 37

• Manufacturer Part Number: MAX5952AEAX+
• Description: IC PSE CNTRLR FOR POE 36-SSOP
• Manufacturer: Maxim Integrated Products
• Type: Power Over Ethernet Controller (PoE)r

Specifications of MAX5952AEAX+

• Applications: Remote Peripherals (Industrial Controls, Cameras, Data Access)
• Internal Switch(s): No
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-BSOP (0.300", 7.5mm Width)
• Product: Controllers & Switches
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.71 V
• Power Dissipation: 941 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Supply Current: 4.8 mA
• Input Voltage: 60V
• Digital Ic Case Style: SSOP
• No. Of Pins: 36
• Uvlo: 28.5V
• Frequency: 400kHz
• Interface: I2C
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Controller Type: Power Over Ethernet PD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Enable the SMODE function (Table 25) by setting
EN_WHDOG (R1Fh[7]) to 1. SMODE_ bit goes high
when the watchdog counter reaches zero and the
port(s) switch over to hardware-controlled mode.
Set EN_WHDOG (R1Fh[7]) to 1 to enable the watchdog
function. When activated, the watchdog timer counter,
WDTIME[7:0], continuously decrements toward zero
once every 164ms. Once the counter reaches zero
(also called watchdog expiry), the MAX5952 enters
hardware-controlled mode and each port shifts to a
mode set by the HWMODE_ bit in register R1Fh (Table
27). Use software to set WDTIME (Table 26) and contin-
uously set this register to some nonzero value before
Table 25. SMODE Enable Register
Table 26. Watchdog Register
SMODE4
SMODE3
SMODE2
SMODE1
WDTIME
SYMBOL
SYMBOL
ADDRESS = 1Ch
ADDRESS = 1Eh
______________________________________________________________________________________
BIT
BIT
7
6
5
4
3
2
1
0
3
2
1
0
CoR
CoR
CoR
CoR
CoR
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
High-Power, Quad, PSE Controller
Port 4 hardware control flag
Port 3 hardware control flag
Port 2 hardware control flag
Port 1 hardware control flag
WDTIME[7]
WDTIME[6]
WDTIME[5]
WDTIME[4]
WDTIME[3]
WDTIME[2]
WDTIME[1]
WDTIME[0]
for Power-Over-Ethernet
SMODE_ also goes high each and every time the soft-
ware tries to power on a port, but is denied since the
port is in hardware mode. A reset sets R1Ch = 00h.
the register reaches zero to prevent a watchdog expiry.
In this way, the software gracefully manages the power
to ports upon a system crash or switchover.
While in hardware-controlled mode, the MAX5952
ignores all requests to turn the power on and the flag
SMODE_ indicates that the hardware has taken control
of the MAX5952 operation. In addition, the software is
not allowed to change the mode of operation in hard-
ware-controlled mode. A reset sets R1Eh = 00h.
DESCRIPTION
DESCRIPTION
37