Rainbow Electronics MAX5965B - Manual (Page 43)

MAX5965A/MAX5965B
High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
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Table 35b. Class Sequence States (continued)
CLASS_[5:0]
(ADDRESS = 2Ch, 2Dh,
2Eh, 2Fh)
CLASS
SEQUENCE
ICUT[2:0]
101010 Illegal 000
101011 Illegal 000
101100 Illegal 000
101101 Illegal 000
101110 Illegal 000
101111 Illegal 000
110000 Reserved 000
110001 Reserved 000
110010 Reserved 000
110011 Reserved 000
110100 Reserved 000
CLASS_[5:0]
(ADDRESS = 2Ch, 2Dh,
2Eh, 2Fh)
CLASS
SEQUENCE
ICUT[2:0]
110101 Reserved 000
110110 Reserved 000
110111 Reserved 000
111000 Reserved 000
111001 Reserved 000
111010 Reserved 000
111011 Reserved 000
111100 Reserved 000
111101 Reserved 000
111110 Reserved 000
111111 Reserved 000
ADDRESS = 30h, 31h, 32h, 33h, 34h,
35h, 36h, 37h
SYMBOL BIT R/W
DESCRIPTION
7 W IPD_[8]
6 W IPD_[7]
5 W IPD_[6]
4 W IPD_[5]
3 W IPD_[4]
2 W IPD_[3]
1 W IPD_[2]
IPD_
0 W IPD_[1]/IPD_[0]
Table 36. Current Registers
When the ENx_CL6 (R1Ch[7:4]) bits are set, 2-event
classification is enabled. Classification is repeated
three times and the classification results are set
according to Table 35b.
A Class 6 PD is defined by any sequence of the type
[00x, 0x0, 0xx, x00, x0x, xx0] where ‘x’ can be 1, 2, 3,
4, or 5. All sequences made by the same class result
define the class itself (for example, 222 defines Class
2). Any other sequence will be considered illegal and
coded as 101—-. For example, a sequence 232 or 203
will be illegal. The illegal sequences all default to class
0. A reset or power-up sets R2Ch = R2Dh = R2Eh =
R2Fh = 00h.
The MAX5965A/MAX5965B provide current readout for
each port during classification and normal power
mode. The current per port information is separated
into 9 bits. They are organized into two consecutive
registers for each one of the ports. The information can
be quickly retrieved using the autoincrement option of
the address pointer. To avoid the LSB register chang-
ing while reading the MSB, the information is frozen
once the addressing byte points to any of the current
readout registers.
During power mode, the current value can be calculat-
ed as
I PORT = N IPD_ x 1.953125mA
During classification, the current is
I CLASS = N IPD_ x 0.0975mA
where N IPD_ is the decimal value of the 9-bit word. The
ADC saturates both at full scale and at zero. A reset
sets R30h to R37h = 00h.