______________________________________________________________________________________ 41
MAX5971B
Single-Port, 40W, IEEE 802.3af/at,
PSE Controller with I
2
C
Table 40. Register Summary
ADDR REGISTER NAME R/W BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
RESET
STATE
INTERRUPTS
00h Interrupt R SUP_INT Reserved IMAX_INT CL_INT DET_INT LD_INT PG_INT PE_INT
0000 to
0000
01h Interrupt Mask R/W MASK7 Reserved MASK5 MASK4 MASK3 MASK2 MASK1 MASK0
1010 to
0100
EVENTS
02h Power Event R
Reserved Reserved Reserved PG_CHG Reserved Reserved Reserved
PWEN_CHG
0000 to
0000
03h Power Event CoR CoR
04h Detect Event R
Reserved Reserved Reserved CL_END Reserved Reserved Reserved DET_END
0000 to
0000
05h Detect Event CoR CoR
06h Fault Event R
Reserved Reserved Reserved LD_DISC Reserved Reserved Reserved IMAX_FLT
0000 to
0000
07h Fault Event CoR CoR
08h Startup Event R
Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved —
09h Startup Event CoR CoR
0Ah Supply Event R
TSD Reserved Reserved V
EE_UVLO
V
EE_OV
V
EE_UV
Reserved Reserved
0000 to
0000
0Bh Supply Event CoR CoR
STATUS
0Ch Port Status R Reserved CLASS[2] CLASS[1] CLASS[0] Reserved DET_ST[2] DET_ST[1] DET_ST[0]
0000 to
0000
0Dh Reserved — Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved —
0Eh Reserved — Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved —
0Fh Reserved — Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved —
10h Power Status R Reserved Reserved Reserved PGOOD Reserved Reserved Reserved PWR_EN
0000 to
0000
11h Pin Status R Reserved Reserved Reserved Reserved OSC LEGACY MIDSPAN Reserved
0000 to
xxx1
CONFIGURATION
12h Operating Mode R/W Reserved Reserved Reserved Reserved POFF_CL Reserved P_M[1] P_M[0]
0000 to
0011
13h Disconnect Enable R/W Reserved Reserved Reserved ACD_EN Reserved Reserved Reserved DCD_EN
000x to
000x
14h Det/Class Enable R/W Reserved Reserved Reserved CLASS_EN Reserved Reserved Reserved DET_EN
0001 to
0001
15h Backoff Enable R/W Reserved Reserved Reserved Reserved Reserved Reserved Reserved BCKOFF
0000 to
000x
16h
Timing
Configuration
R/W RSRT[1] RSRT[0] TSTART[1] TSTART[0] TFAULT[1] TFAULT[0] TDISC[1] TDISC[0]
0000 to
0000
17h
Miscellaneous
Configurations 1
R/W INT_EN RSRT_EN Reserved Reserved Reserved CL_DISC OUT_ISO HP_TIME
1100 to
0000
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