DS1876 datasheet(51/69 Pages) MAXIM

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______________________________________________________________________________________ 51

SFP Controller with Dual LDD Interface

Table 02h, Register 8Dh: RANGING1

FACTORY DEFAULT

00h

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)

8Dh

RESERVED

HBIAS12

HBIAS11

HBIAS10

RESERVED

TXP12

TXP11

TXP10

BIT 7

BIT 0

The upper nibble of this byte controls the full-scale range of the QT monitoring for BMON1. The lower nibble of

this byte controls the full-scale range for the QT monitoring for PMON1.

BITS 7, 3

RESERVED (default = 0)

BITS 6:4

HBIAS1[2:0]: HBIAS1 full-scale ranging: 3-bit value to select the full-scale comparison voltage for

BMON1. Default is 000b and creates a full scale of 1.25V.

HBIAS1[2:0]

% OF 1.25V

FS VOLTAGE (V)

000b

100.00

1.250

001b

80.03

1.000

010b

66.71

0.834

011b

50.07

0.626

100b

40.08

0.501

101b

33.41

0.418

110b

28.65

0.358

111b

25.08

0.314

BITS 2:0

TXP1[2:0]: TXP1 full-scale ranging: 3-bit value to select the full-scale comparison voltage for

PMON1. Default is 000b and creates a full scale of 2.5V.

TXP1[2:0]

% OF 2.5V

FS VOLTAGE (V)

000b

100.00

2.507

001b

80.03

2.006

010b

66.71

1.672

011b

50.07

1.255

100b

40.08

1.005

101b

33.41

0.838

110b

28.65

0.718

111b

25.08

0.629

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