Datasheet

29Maxim Integrated
SFP Controller for Dual Rx Interface
DS1877
Lower Memory Register Descriptions
Lower Memory, Register 00h–01h: TEMP ALARM HI
Lower Memory, Register 04h–05h: TEMP WARN HI
Lower Memory, Register 02h–03h: TEMP ALARM LO
Lower Memory, Register 06h–07h: TEMP WARN LO
FACTORY DEFAULT 7FFFh
READ ACCESS All
WRITE ACCESS PW2 or (PW1 and WLOWER)
A2h AND B2h MEMORY Common A2h and B2h memory locations
MEMORY TYPE Nonvolatile (SEE)
00h, 04h S 2
6
2
5
2
4
2
3
2
2
2
1
2
0
01h, 05h 2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
BIT 7 BIT 0
Temperature measurement updates above this two’s complement threshold set its corresponding alarm or warn-
ing bit. Temperature measurement updates equal to or below this threshold clear its alarm or warning bit.
FACTORY DEFAULT 8000h
READ ACCESS All
WRITE ACCESS PW2 or (PW1 and WLOWER)
A2h AND B2h MEMORY Common A2h and B2h memory locations
MEMORY TYPE Nonvolatile (SEE)
02h, 06h S 2
6
2
5
2
4
2
3
2
2
2
1
2
0
03h, 07h 2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
BIT 7 BIT 0
Temperature measurement updates below this two’s complement threshold set its corresponding alarm or warn-
ing bit. Temperature measurement updates equal to or above this threshold clear its alarm or warning bit.