max5952auaxt Maxim Integrated Products, Inc., max5952auaxt Datasheet - Page 41

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

The MAX5952 provides current readout for each port
during classification and normal power mode. The cur-
rent per port information is separated into 9 bits. They
are organized into 2 consecutive registers for each one
of the ports. The information can be quickly retrieved
using the auto-increment option of the address pointer.
To avoid the LSB register changing while reading the
MSB, the information is frozen once the addressing
byte points to any of the current readout registers.
Table 34c. ICUT Register Bit Values for Current-Limit Threshold
Table 35. Classification Status Registers
Table 36. Current Registers
Reserved
ADDRESS = 30h, 31h, 32h, 33h, 34h,
ICUT_[2:0] (ADDRESS = 2Ah, 2Bh)
ADDRESS = 2Ch, 2Dh, 2Eh, 2Fh
SYMBOL
SYMBOL
IPD_
35h, 36h, 37h
000
001
010
011
100
101
110
111
______________________________________________________________________________________
BIT
BIT
7
6
7
6
5
4
3
2
1
0
R/W
R/W
—
—
W
W
W
W
W
W
W
W
High-Power, Quad, PSE Controller
Reserved
Reserved
IPD_[8]
IPD_[7]
IPD_[6]
IPD_[5]
IPD_[4]
IPD_[3]
IPD_[2]
IPD_[1]/IPD_[0]
SCALE FACTOR
1.75x
2.25x
0.53x
1.5x
2.5x
0.3x
1x
2x
for Power-Over-Ethernet
During power mode, the current value can be calculat-
ed as
During classification, the current is
where N
ADC saturates both at full scale and at zero. A reset
sets R30h–R37h = 00h.
IPD
DESCRIPTION
DESCRIPTION
TYPICAL CURRENT-LIMIT THRESHOLD (mA)
is the decimal value of the 9-bit word. The
I
PORT
I
CLASS
= N
= N
IPD_
IPD_
Class 1
Class 2
x 1.953125mA
375
563
656
750
844
938
x 0.0975mA
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