DS1877 datasheet(59/65 Pages) MAXIM

59 / 65 page

Maxim Integrated

SFP Controller for Dual Rx Interface

DS1877

Table 02h, Register C6h: POLARITY

Table 02h, Register C2h

–C5h: RESERVED

FACTORY DEFAULT

00h

READ ACCESS

N/A

WRITE ACCESS

N/A

A2h AND B2h MEMORY

N/A

MEMORY TYPE

N/A

These registers are reserved.

FACTORY DEFAULT

0Ah

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 locations

MEMORY TYPE

Nonvolatile (SEE)

C6h

RESERVED

DAC2P

RESERVED

DAC1P

RESERVED

BIT 7

BIT 0

BITS 7:4,

2, 0

RESERVED

BIT 3

DAC2P: DAC2 VALUE polarity. The DAC2 VALUE (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 DAC2 VALUE 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

DAC1P: DAC1 VALUE polarity. The DAC1 VALUE (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 DAC1 VALUE 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.

DS1877 Datasheet(PDF) 59 Page - Maxim Integrated Products

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