DS1875T+ Maxim Integrated Products, DS1875T+ Datasheet - Page 62

• Manufacturer Part Number: DS1875T+
• Description: IC SFP CTRLR/TRIPLEXER 38-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of DS1875T+

• Applications: Fiber Optics
• Interface: I²C
• Voltage - Supply: 2.85 V ~ 3.9 V
• Package / Case: *
• Mounting Type: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PON Triplexer and SFP Controller
Table 02h, Register 81h: Temperature Index (TINDEX)
Table 02h, Register 82h: MOD DAC
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81h
82h
FACTORY DEFAULT
READ ACCESS
WRITE ACCESS
MEMORY TYPE
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, 05h, 07h, and 08h. Temperature measurements below -40°C or above +102°C are clamped
to 00h 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:
The digital value used for MOD 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 05h (APC)
Table 07h (PWM)
Table 08h (BIAS)
BIT 7
BIT 7
2
7
2
7
2
6
2
1
1
1
1
6
TINDEX
TINDEX
00h
PW2
PW2 and AEN = 0
Volatile
0
0
00h
PW2
PW2 and MOD EN = 0
Volatile
2
6
6
5
2
5
TINDEX =
TINDEX
TINDEX
TINDEX
TINDEX
V
MOD
5
6
6
5
=
2
Temp _ Value + 40°C
4
Full Scale
2
4
TINDEX
TINDEX
TINDEX
TINDEX
255
2°C
4
5
5
4
MOD DAC
2
3
2
TINDEX
TINDEX
TINDEX
TINDEX
3
+ 80h
3
4
4
3
2
TINDEX
TINDEX
TINDEX
TINDEX
2
2
2
2
3
3
2
TINDEX
TINDEX
TINDEX
TINDEX
2
2
1
1
1
2
2
1
TINDEX
TINDEX
TINDEX
TINDEX
BIT 0
BIT 0
2
2
0
0
0
1
1
0