MAX5971B Maxim Integrated Products, MAX5971B Datasheet - Page 35

• Manufacturer Part Number: MAX5971B
• Description: PSE Controller
• Manufacturer: Maxim Integrated Products

Table 26. Power Enable Pushbutton Register
Table 27. Global Pushbutton Register
Table 28. ID Register
CLR_INT (R1Ah[7]) clears all the event registers and the
corresponding interrupt bits in the interrupt register (R00h,
Table 7). Writing a 1 to RESET_IC (R1Ah[4]) causes a
global software reset, after which all registers are set back
to default values (after reset condition clears). Writing a
1 to RESET_P (R1Ah[0]) turns off power to the port and
resets only the port status and event registers. After the
appropriate command is executed, the bits in the global
pushbutton register all reset to 0.
PWR_OFF
RESET_IC
ID_CODE
SYMBOL
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
PWR_ON
SYMBOL
Reserved
Reserved
Reserved
Reserved
Reserved
RESET_P
SYMBOL
CLR_INT
REV
ADDRESS = 1Ah
ADDRESS = 1Bh
ADDRESS = 19h
BIT NO.
BIT NO.
BIT NO.
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
______________________________________________________________________________________
TYPE
TYPE
TYPE
R/W
R/W
R/W
R/W
R/W
—
—
—
—
—
—
—
—
—
—
—
R
R
R
R
R
R
R
R
Reserved
Reserved
Reserved
A logic-high powers off the port
Reserved
Reserved
Reserved
A logic-high powers on the port
A logic-high clears all interrupts
Reserved
Reserved
A logic-high resets the entire device
Reserved
Reserved
Reserved
A logic-high resets the port
ID_CODE[4]
ID_CODE[3]
ID_CODE[2]
ID_CODE[1]
ID_CODE[0]
REV [2]
REV [1]
REV [0]
Single-Port, 40W, IEEE 802.3af/at,
PSE Controller with I
The ID register (R1Bh, Table 28) keeps track of the
device ID number and revision. The MAX5971B’s ID
code is stored in ID_CODE[4:0] (R1Bh[7:3]) and is
10000. Contact the factory for the value of the revision
code stored in REV[2:0] (R1Bh[2:0]) that corresponds to
the device lot number.
DESCRIPTION
DESCRIPTION
DESCRIPTION
General Registers (R1Bh to R1Fh)
ID Register (R1Bh)
2
C
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