MAX5935CAX Maxim Integrated Products, MAX5935CAX Datasheet - Page 15

• Manufacturer Part Number: MAX5935CAX
• Description: Hot Swap & Power Distribution
• Manufacturer: Maxim Integrated Products

Specifications of MAX5935CAX

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Table 2. PSE Classification of a PD
(Table 33.4 of the IEEE 802.3af Standard)
Table 2 shows the IEEE 802.3af requirement for a PSE
classifying a PD at the Power Interface (PI).
When the part enters PWR MODE, the t
timers are reset. Before turning on the power, the part
Table 1. PSE PI Detection Modes Electrical Requirement
(Table 33-2 of the IEEE 802.3af Standard)
0 to 5
> 5 and < 8
8 to 13
> 13 and < 16
16 to 21
> 21 and < 25
25 to 31
> 31 and <35
35 to 45
> 45 and < 51
Open-Circuit Voltage
Short-Circuit Current
Valid Test Voltage
Voltage Difference Between
Test Points
Time Between Any Two Test
Points
Slew Rate
Accept Signature Resistance
Reject Signature Resistance
Open-Circuit Resistance
Accept Signature
Capacitance
Reject Signature
Capacitance
Signature Offset Voltage
Tolerance
Signature Offset Current
Tolerance
MEASURED I
PARAMETER
CLASS
______________________________________________________________________________________
(mA)
SYMBOL
Class 0
May be Class 0 and 1
Class 1
May be Class 0, 1, or 2
Class 2
May be Class 0, 2, or 3
Class 3
May be Class 0, 3, or 4
Class 4
May be Class 0 or 4
C
∆V
R
V
V
R
R
C
V
VALID
GOOD
GOOD
V
SLEW
OPEN
I
I
t
BAD
BAD
SC
OS
TEST
BP
OC
OS
CLASSIFICATION
Powered State
Quad Network Power Controller
START
< 15
MIN
500
2.8
19
10
—
—
—
—
1
2
0
0
and t
MAX
> 33
26.5
150
0.1
2.0
30
10
12
—
—
—
—
5
DISC
UNITS
V/µs
mA
ms
kΩ
kΩ
kΩ
µA
nF
µF
V
V
V
V
checks if any other port is not turning on and if the
t
ACD_EN bit is set; in this case, the OSC_FAIL bit must
be low (oscillator is okay) for the port to be powered.
If these conditions are met, then the part enters startup
where it turns on power to the port. An internal signal,
POK_, is asserted high when V
V
high longer than t
when POK goes low.
The PWR_CHG bit sets when a port powers up or down.
PWR_EN sets when a port powers up and resets when a
port shuts down. The port shutdown timer lasts 0.5ms
and prevents other ports from turning off during that peri-
od, except in the case of emergency shutdowns (RESET
= L, RESET_IC = H, V
The MAX5935 always checks the status of all ports before
turning off. A priority logic system determines the order to
prevent the simultaneous turn-on or turn-off of the ports.
The port with the lesser ordinal number gets priority over
the others (i.e., Port 1 turns on first, Port 2 second, Port 3
third and Port 4 fourth). Setting PWR_OFF_ high turns off
power to the corresponding port.
FAULT
EE
In detection mode only.
In detection mode only.
This timing implies a 500Hz maximum probing frequency.
. PGOOD_ status bits are set high if POK_ stays
timer is zero. Another check is performed if the
for Power-Over-LAN
ADDITIONAL INFORMATION
PGOOD
EEUVLO
. PGOOD immediately resets
, V
DDUVLO
OUT
is within 2V from
, and TSHD).
15