Table 07h register descriptions, Ds1874 sfp+ controller with digital ldd interface – Rainbow Electronics DS1874 User Manual
Page 86
DS1874
SFP+ Controller with Digital LDD Interface
86
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Table 07h Register Descriptions
Table 07h, Register 80h–A3h: DAC1 LUT
FACTORY
DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL78) and (PW1 and RTBL78)
WRITE ACCESS
PW2 or (PW1 and RWTBL78)
MEMORY
TYPE Nonvolatile
(EE)
80h–A3h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT
7
BIT
0
The DAC1 LUT is a set of registers assigned to hold the PWM profile for DAC1. The values in this table
determine the set point for DAC1. The temperature measurement is used to index the LUT (TINDEX, Table 02h,
Register 81h) in 4°C increments from -40°C to +100°C, starting at Register 80h in Table 07h. Register 80h
defines the -40°C to -36°C DAC1 value, Register 81h defines -36°C to -32°C DAC1 value, and so on. Values
recalled from this EEPROM memory table are written into the DAC1 VALUE (Table 02h, Registers 84h–85h)
location, which holds the value until the next temperature conversion. The part can be placed into a manual
mode (DAC1 EN bit, Table 02h, Register 80h), where DAC1 can be directly controlled for calibration. If
temperature compensation is not required by the application, program the entire LUT to the desired DAC1 set
point.
FACTORY
DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL78) or (PW1 and RTBL78)
WRITE ACCESS
PW2 or (PW1 and RWTBL78)
MEMORY
TYPE Nonvolatile
(EE)
These registers are reserved.
Table 07h, Register A4h–A7h: RESERVED