SI3452 SILABS [Silicon Laboratories], SI3452 Datasheet - Page 6

• Manufacturer Part Number: SI3452
• Description: QUAD HIGH-VOLTAGE PORT CONTROLLER FOR POE AND POE+ PSES
• Manufacturer: SILABS [Silicon Laboratories]

Table 4. Detection Specifications
Si3452/3
Table 5. Classification Specifications
6
Description
Detection current limit
Detection voltage,
when R
Detection slew rate
Detection probe duration
Detection probe cycle time
Minimum valid signature resistance
Maximum valid signature resistance
Resistance at which open circuit is declared
Resistance at which short circuit is declared
Valid detect capacitance
Invalid detect capacitance
Description
Class event voltage
Mark event voltage
Classification current
limit
Classification current
regions
Classification delay
Classification event time
Mark event time
DET
= 25 kΩ
T
I
LIM_CLASS
CLASS_DLY
Symbol
V
V
T
CLASS
T
MARK
CLE
ME
Width of mark between classification
Time from end of valid detect cycle
Width of valid V
Measured with DETn shorted to
Event or 2-Event classification
C
C
R
R
DET_INVALD
Symbol
I
DET_VALID
R
T
LIM_DET
DET_MAX
R
V
V
V
DET_MIN
PROBE
T
SHORT
to classification begin
OPEN
0 mA < I
DET1
DET2
DET3
0 mA < I
DET
Test Conditions
Rev. 1.0
Overcurrent
Class 0
Class 1
Class 2
Class 3
Class 4
events
GND
Port
Port
CLASS
Measured with DETn
Test Conditions
shorted to GND
< 45 mA
< 5 mA
probe for 1-
–20.5
Min
–10.0
–7
51
16
25
35
51
10
—
—
26.5
Min
0
8
100
150
10
15
10
—
—
—
—
—
—
Typ
–4.0
–8.0
–4.0
—
—
—
—
—
—
—
—
—
—
Typ
5
8
—
—
—
—
—
—
—
—
—
3
–15.5
Max
–10
100
Max
–2.8
–2.8
13
21
31
45
30
500
400
400
150
—
—
—
0.1
30
19
33
5
—
—
5
Unit
Unit
V/μs
mA
mA
ms
ms
ms
mA
ms
ms
k
k
k
nF
μF
V
V
V
