DS1876 datasheet(64/69 Pages) MAXIM

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SFP Controller with Dual LDD Interface

Table 04h Register Descriptions

Table 04h, Register 80h–C7h: MODULATION LUT (MOD)

Table 02h, Register C8h–F7h: EMPTY

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

Digital value for the MOD1 DAC (A2h address) and MOD2 DAC (B2h address) outputs. The MODULATION LUT

is a set of registers assigned to hold the temperature profile for the MOD1 and MOD2 DACs. The temperature

measurement is used to index the LUT (TINDEX, Table 02h, Register 81h) in 2NC increments from -40NC to

+102NC, starting at 80h in Table 04h. Register 80h defines the -40NC to -38NC MOD output, Register 81h defines

-38NC to -36NC MOD output, and so on. Values recalled from this EEPROM memory table are written into the

MOD1 and MOD2 DACs (Table 02h, Registers C8h–C9h, CCh–CDh) locations that hold the values until the next

temperature conversion. The part can be placed into a manual mode (MOD1EN and MOD2EN bits, Table 02h,

sation functionality is not required, program the entire Table 04h to the desired modulation setting.

FACTORY DEFAULT

00h

READ ACCESS

N/A

WRITE ACCESS

N/A

A2h AND B2h MEMORY

N/A

MEMORY TYPE

None

These registers do not exist.

DS1876 Datasheet(PDF) 64 Page - Maxim Integrated Products