Rainbow Electronics MAX5971B - Manual (Page 35)

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MAX5971B
Single-Port, 40W, IEEE 802.3af/at,
PSE Controller with I 2 C
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. General Registers (R1Bh to R1Fh)
ID Register (R1Bh)
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.
Table 26. Power Enable Pushbutton Register
Table 27. Global Pushbutton Register
Table 28. ID Register
ADDRESS = 1Bh
DESCRIPTION
SYMBOL BIT NO. TYPE
ID_CODE
7 R ID_CODE[4]
6 R ID_CODE[3]
5 R ID_CODE[2]
4 R ID_CODE[1]
3 R ID_CODE[0]
REV
2 R REV [2]
1 R REV [1]
0 R REV [0]
ADDRESS = 19h
DESCRIPTION
SYMBOL BIT NO. TYPE
Reserved 7 — Reserved
Reserved 6 — Reserved
Reserved 5 — Reserved
PWR_OFF 4 R/W A logic-high powers off the port
Reserved 3 — Reserved
Reserved 2 — Reserved
Reserved 1 — Reserved
PWR_ON 0 R/W A logic-high powers on the port
ADDRESS = 1Ah
DESCRIPTION
SYMBOL BIT NO. TYPE
CLR_INT 7 R/W A logic-high clears all interrupts
Reserved 6 — Reserved
Reserved 5 — Reserved
RESET_IC 4 R/W A logic-high resets the entire device
Reserved 3 — Reserved
Reserved 2 — Reserved
Reserved 1 — Reserved
RESET_P 0 R/W A logic-high resets the port