DS1876 datasheet(60/69 Pages) MAXIM

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SFP Controller with Dual LDD Interface

Table 02h, Register C6h: POLARITY

FACTORY DEFAULT

0Fh

READ ACCESS

PW2 or (PW1 and RWTBL2) or (PW1 and RTBL2)

WRITE ACCESS

PW2 or (PW1 and RWTBL2)

A2h AND B2h MEMORY

Common A2h and B2h memory location

MEMORY TYPE

Nonvolatile (SEE)

C6h

RESERVED

MOD2P

APC2P

MOD1P

APC1P

BIT 7

BIT 0

BITS 7:4

RESERVED

BIT 3

MOD2P: MOD2 DAC polarity. The MOD2 DAC (Table 02h, Registers C8h–C9h) range is

000h–3FFh. A setting of 000h creates a pulse-density of zero and 3FFh creates a pulse-density of

1023/1024. This polarity bit allows the user to use GND or VREFIN as the reference. The power-on

of MOD2 DAC is 000h; thus an application that needs VREFIN to be the off state should use the

inverted polarity.

0 = Normal polarity. A setting of 000h results in a pulse-density output of zero held at GND, and a

setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at VREFIN.

1 = Inverted polarity. A setting of 000h results in a pulse-density output of zero held at VREFIN, and

a setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at GND.

BIT 2

APC2P: APC2 DAC polarity. The APC2 DAC (Table 02h, Registers CAh–CBh) range is 000h–3FFh.

A setting of 000h creates a pulse-density of zero, and 3FFh creates a pulse-density of 1023/1024.

This polarity bit allows the user to use GND or VREFIN as the reference. The power-on of APC DAC

is 000h; thus an application that needs VREFIN to be the off state should use the inverted polarity.

0 = Normal polarity. A setting of 000h results in a pulse-density output of zero held at GND, and a

setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at VREFIN.

1 = Inverted polarity. A setting of 000h results in a pulse-density output of zero held at VREFIN, and

a setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at GND.

BIT 1

MOD1P: MOD1 DAC polarity. The MOD1 DAC (Table 02h, Registers CCh–CDh) range is

000h–3FFh. A setting of 000h creates a pulse-density of zero and 3FFh creates a pulse-density of

1023/1024. This polarity bit allows the user to use GND or VREFIN as the reference. The power-on

of MOD1 DAC is 000h; thus an application that needs VREFIN to be the off state should use the

inverted polarity.

0 = Normal polarity. A setting of 000h results in a pulse-density output of zero held at GND, and a

setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at VREFIN.

1 = Inverted polarity. A setting of 000h results in a pulse-density output of zero held at VREFIN, and

a setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at GND.

BIT 0

APC1P: APC1 DAC polarity. The APC1 DAC (Table 02h, Registers CEh–CFh) range is 000h–3FFh.

A setting of 000h creates a pulse-density of zero, and 3FFh creates a pulse-density of 1023/1024.

This polarity bit allows the user to use GND or VREFIN as the reference. The power-on of APC1

DAC is 000h; thus an application that needs VREFIN to be the off state should use the inverted

polarity.

0 = Normal polarity. A setting of 000h results in a pulse-density output of zero held at GND, and a

setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at VREFIN.

1 = Inverted polarity. A setting of 000h results in a pulse-density output of zero held at VREFIN, and

a setting of 3FFh results in a pulsed-density output of 1023/1024 held mostly at GND.

DS1876 Datasheet(PDF) 60 Page - Maxim Integrated Products

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