DS1877T+ Maxim Integrated Products, DS1877T+ Datasheet - Page 44

• Manufacturer Part Number: DS1877T+
• Description: IC CTLR/MON SFP 1-2CH 28TQFN
• Manufacturer: Maxim Integrated Products
• Type: SFP+ Controllerr

Specifications of DS1877T+

• Input Type: Logic
• Output Type: Logic
• Interface: I²C
• Current - Supply: 2.5mA
• Mounting Type: Surface Mount
• Package / Case: 28-WFQFN exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 90-1877T+000

SFP Controller for Dual Rx Interface
Table 02h, Register 86h: DEVICE ID
Table 02h, Register 81h: TEMPERATURE INDEX (TINDEX)
Table 02h, Register 82h–85h: RESERVED
44
81h
86h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
A2h AND B2h MEMORY
MEMORY TYPE
Holds the calculated index based on the temperature measurement. This index is used for the address during lookup
of Table 04h. Temperature measurements below -40NC or above +102NC are clamped to 80h and C7h, respectively.
The calculation of TINDEX is as follows:
For the temperature-indexed LUTs (2NC), the index used during the lookup function for each table is as follows:
Table 04h (DAC)
For the 8-position LUT tables, the following table shows the lookup function:
TINDEX
BYTE
TEMP (NC)
BIT 7
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
A2h AND B2h MEMORY
MEMORY TYPE
These registers are reserved.
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
Hardwired connections to show the device ID.
2
7
BIT 7
0
1000_0xxx
< -8
F8
2
6
1
1
1001_0xxx
TINDEX
-8 to +8
F9
77h
PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
N/A
ROM
00h
N/A
N/A
N/A
N/A
2
6
00h
PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)
(PW2 and AEN = 0) or (PW1 and RWTBL2 and AEN = 0)
Common A2h and B2h memory locations
Volatile
5
1
1001_1xxx
+8 to +24
TINDEX
TINDEX
FA
5
=
2
4
Temp_Value 40 C
1010_0xxx
+24 to +40
1
TINDEX
FB
2 C
°
4
+
2
3
1010_1xxx
+40 to +56
TINDEX
0
°
FC
+
80h
3
2
1011_0xxx
+56 to +72
TINDEX
2
1
FD
2
+72 to +88
1011_1xxx
TINDEX
2
1
1
FE
1
11xx_xxxx
TINDEX
BIT 0
BIT 0
R +88
2
1
FF
0
0