Rainbow Electronics DS1875 - Manual (Page 88)

DS1875
PON Triplexer and SFP Controller
88 ______________________________________________________________________________________
Table 05h Register Descriptions
Table 05h, Register 80h to A3h: APC TE LUT
FACTORY DEFAULT 00h
READ ACCESS PW2
WRITE ACCESS PW2
MEMORY TYPE Nonvolatile (EE)
80h to A3h 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0
BIT 7 BIT 0
The APC TE LUT is a set of registers assigned to hold the temperature profile for the APC reference DAC. The
values in this table combined with the APC bits in the COMP RANGING register (Table 02h, Register 8Dh)
determine the set point for the APC loop. 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 05h.
Register 80h defines the -40°C to -36°C APC reference value, Register 81h defines the -36°C to -32°C APC
reference value, and so on. Values recalled from this EEPROM memory table are written into the APC DAC
(Table 02h, Register 83h) location that holds the value until the next temperature conversion. The DS1875 can
be placed into a manual mode (APC EN bit, Table 02h, Register 80h), where APC DAC can be directly
controlled for calibration. If TE temperature compensation is not required by the application, program the entire
LUT to the desired APC set point.
Table 05h, Register A4h to A7h: RESERVED
FACTORY DEFAULT 00h
READ ACCESS PW2
WRITE ACCESS PW2
MEMORY TYPE Nonvolatile (EE)
These registers are reserved.