DS1878T+ Maxim Integrated Products, DS1878T+ Datasheet - Page 58
DS1878T+
Manufacturer Part Number
DS1878T+
Description
IC CTLR SFP W/DGTL LDD RX 28TQFN
Manufacturer
Maxim Integrated Products
Type
SFP+ Controllerr
Datasheet
1.DS1878TTR.pdf
(98 pages)
Specifications of DS1878T+
Input Type
*
Output Type
*
Interface
*
Current - Supply
*
Mounting Type
Surface Mount
Package / Case
28-WFQFN exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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SFP+ Controller with Digital LDD Interface
Table 02h, Register 81h: TEMPERATURE INDEX (TINDEX)
Table 02h, Register 82h–83h: MODULATION REGISTER
58
______________________________________________________________________________________
81h
82h
83h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
Holds the calculated index based on the temperature measurement. This index is used for the address during
lookup of Tables 04h, 06h–08h. Temperature measurements below -40°C or above +102°C are clamped to 80h and
C7h, respectively. The calculation of TINDEX is as follows:
For the temperature-indexed LUTs, the index used during the lookup function for each table is as follows:
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
The digital value used for MODULATION and recalled from Table 04h at the adjusted memory address found in
TINDEX. This register is updated at the end of the temperature conversion.
Table 04h (MOD)
Table 06h (APC)
Table 07h (DAC1)
Table 08h (DAC2)
BIT 7
BIT 7
2
2
0
7
7
2
2
0
6
6
1
1
1
1
TINDEX
00h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
(PW2 and AEN = 0) or (PW1 and RWTBL246 and AEN = 0)
Volatile
0000h
PW2 or (PW1 and RWTBL246) or (PW1 and RTBL246)
(PW2 and MOD EN = 0) or (PW1 and RWTBL246 and MOD EN = 0)
Volatile
0
0
0
2
2
0
6
5
5
TINDEX =
TINDEX
TINDEX
TINDEX
TINDEX
5
6
6
6
2
2
0
Temp _ Value + 40°C
4
4
TINDEX
TINDEX
TINDEX
TINDEX
2°C
4
5
5
5
2
2
0
3
3
TINDEX
TINDEX
TINDEX
TINDEX
+ 80h
3
4
4
4
2
2
TINDEX
TINDEX
TINDEX
TINDEX
0
2
2
2
3
3
3
TINDEX
TINDEX
TINDEX
TINDEX
2
2
0
1
1
1
2
2
2
TINDEX
TINDEX
TINDEX
TINDEX
BIT 0
BIT 0
2
2
2
0
8
0
0
1
1
1
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