DS1876 datasheet(65/69 Pages) MAXIM

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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

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

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.

DS1876 Datasheet(PDF) 65 Page - Maxim Integrated Products

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