max5952auaxt Maxim Integrated Products, Inc., max5952auaxt Datasheet - Page 30

• Manufacturer Part Number: max5952auaxt
• Description: Max5952 High-power, Quad, Pse Controller For Power-over-ethernet
• Manufacturer: Maxim Integrated Products, Inc.

High-Power, Quad, PSE Controller
for Power-Over-Ethernet
The port status register (Table 13a) records the results of
the detection and classification at the end of each phase
in three encoding bits each. R0Ch contains the detection
and classification status of port 1. R0Dh corresponds to
port 2, R0Eh corresponds to port 3, and R0Fh corre-
sponds to port 4. Tables 13b and 13c show the detec-
tion/classification result decoding charts, respectively.
For CLC_EN = 0, the detection result is shown in Table
13b. When CLC_EN is set high, the MAX5952 allows valid
detection of high capacitive load of up to 100µF.
Table 13a. Port Status Registers
Table 13b. Detection Result Decoding Chart
Table 13c. Classification Result Decoding
Chart
30
Reserved
CLASS_
Reserved
DET_ST_
(ADDRESS = 0Ch, 0Dh, 0Eh, 0Fh)
(ADDRESS = 0Ch, 0Dh, 0Eh, 0Fh)
______________________________________________________________________________________
SYMBOL
ADDRESS = 0Ch, 0Dh, 0Eh, 0Fh
CLASS_[2:0]
DET_ST_[2:0]
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
BIT
7
6
5
4
3
2
1
0
R/W
Current limit (> I
R
R
R
R
R
R
R
R
CLASS RESULT
None
DCP
HIGH CAP
RLOW
DET_OK
RHIGH
OPEN0
DCN
Unknown
DETECTED
Reserved
CLASS_[2]
CLASS_[1]
CLASS_[0]
Reserved
DET_[2]
DET_[1]
DET_[0]
1
2
3
4
5
0
CILIM
)
Detection status unknown
Positive DC supply connected at the port (AGND - V
High capacitance at the port (> 8.5µF)
Low resistance at the port, R
Detection pass, 15kΩ > R
High resistance at the port, R
Open port (I < 10µA)
Negative DC supply connected to the port (V
When ping-pong classification is not enabled (ENx_CL6
= 0), the classification status is reported in Table 13c.
When ping-pong classification is enabled (ENx_CL6 =
1), the CLASS_[2:0] bits are set to 000 and the classifi-
cation result is reported in locations R2Ch–R2Fh.
As a protection, when POFF_CL (R17h[3], Table 21) is
set to 1, the MAX5952 prohibits turning on power to the
port that returns a status 111 after classification. A reset
sets 0Ch, 0Dh, 0Eh, and 0Fh = 00h.
DESCRIPTION
PD
DESCRIPTION
PD
> 33kΩ
PD
< 15kΩ
> 33kΩ
OUT
- V
OUT_
EE
< 2V)
< 1V)