Table 06h register descriptions, Ds1876 sfp controller with dual ldd interface – Rainbow Electronics DS1876 User Manual
Page 65
______________________________________________________________________________________ 65
DS1876
SFP Controller with Dual LDD Interface
Table 04h, Register F8h–FFh: MOD OFFSET LUT
Table 06h Register Descriptions
Table 06h, Register 80h–C7h: APC LUT
FACTORY DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL46)
WRITE ACCESS
PW2 or (PW1 and RWTBL46)
A2h AND B2h MEMORY
Different A2h and B2h memory locations
MEMORY TYPE
Nonvolatile (EE)
F8h–FFh
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
BIT 7
BIT 0
The digital value for the temperature offset of the MOD1 and MOD2 DAC outputs.
F8h
Less than or equal to -8NC
F9h
Greater than -8NC up to +8NC
FAh
Greater than +8NC up to +24NC
FBh
Greater than +24NC up to +40NC
FCh
Greater than +40NC up to +56NC
FDh
Greater than +56NC up to +72NC
FEh
Greater than +72NC up to +88NC
FFh
Greater than +88NC
The MOD DAC is a 10-bit value. The MODULATION LUT is an 8-bit LUT. The MOD OFFSET LUT times 4 plus
the MODULATION LUT makes use of the entire 10-bit range.
FACTORY DEFAULT
00h
READ ACCESS
PW2 or (PW1 and RWTBL46)
WRITE ACCESS
PW2 or (PW1 and RWTBL46)
A2h AND B2h MEMORY
Different A2h and B2h memory locations
MEMORY TYPE
Nonvolatile (EE)
80h–C7h
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
BIT 7
BIT 0
The digital value for the APC1 DAC (A2h address) and APC2 DAC (B2h address) outputs. The APC LUT is a
set of registers assigned to hold the temperature profile for the APC1 and APC2 DACs. The temperature mea-
surement is used to index the LUT (TINDEX, Table 02h, Register 81h) in 2NC increments from -40NC to +102NC,
starting at 80h. Register 80h defines the -40NC to -38NC APC output, Register 81h defines -38NC to -36NC APC
output, and so on. Values recalled from this EEPROM memory table are written into the APC1 and APC2 DACs
(Table 02h, Registers CAh–CBh, CEh–CFh) locations that hold the values until the next temperature conver-
sion. The part can be placed into a manual mode (APC1EN and APC2EN bits, Table 02h, Register 80h), where
APC1 and APC2 DACs are directly controlled for calibration. If the temperature compensation functionality is not
required, program the entire Table 06h to the desired APC setting.