Rainbow-electronics MAX5965B Manual de usuario descargar pdf (Pagina 43)

MAX5965A/MAX5965B

High-Power, Quad, Monolithic, PSE Controllers

for Power over Ethernet

______________________________________________________________________________________ 43

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

PORT

= N

IPD_

x 1.953125mA

During classification, the current is

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.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 51 52

MAX5965A/MAX5965B 1

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