Table 08h register descriptions, Auxiliary memory a0h registe, Auxiliary memory a0h register descriptions – Rainbow Electronics DS1874 User Manual
Page 87: Ds1874 sfp+ controller with digital ldd interface
DS1874
SFP+ Controller with Digital LDD Interface
______________________________________________________________________________________
87
Table 08h Register Descriptions
Table 08h, Register 80h–A3h: DAC2 LUT
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)
80h–A3h 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT
7
BIT
0
The DAC2 LUT is set of registers assigned to hold the PWM profile for DAC2. The values in this table determine
the set point for DAC2. 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 DAC2 value, Register 81h defines -36°C to -32°C DAC2 value, and so on. Values recalled from
this EEPROM memory table are written into the DAC2 VALUE (Table 02h, Registers 86h–87h) location that holds
the value until the next temperature conversion. The DS1874 can be placed into a manual mode (DAC2 EN bit,
Table 02h, Register 80h), where DAC2 can be directly controlled for calibration. If temperature compensation is
not required by the application, program the entire LUT to the desired DAC2 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.
FACTORY
DEFAULT
00h
READ ACCESS
PW2 or (PW1 and WAUXA) or (PW1 and WAUXAU)
WRITE ACCESS
PW2 or (PW1 and WAUXA)
MEMORY TYPE
Nonvolatile (EE)
00h–FFh 2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT
7
BIT
0
Accessible with the slave address A0h.
Table 08h, Register A4h–A7h: RESERVED
Auxiliary Memory A0h Register Descriptions
Auxiliary Memory A0h, Register 00h–FFh: EEPROM