DS1877 datasheet(44/65 Pages) MAXIM

44 / 65 page

Maxim Integrated

SFP Controller for Dual Rx Interface

DS1877

Table 02h, Register 81h: TEMPERATURE INDEX (TINDEX)

Table 02h, Register 82h

–85h: RESERVED

Table 02h, Register 86h: DEVICE ID

FACTORY DEFAULT

00h

READ ACCESS

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

WRITE ACCESS

(PW2 and AEN = 0) or (PW1 and RWTBL2 and AEN = 0)

A2h AND B2h MEMORY

Common A2h and B2h memory locations

MEMORY TYPE

Volatile

81h

BIT 7

BIT 0

Holds the calculated index based on the temperature measurement. This index is used for the address during lookup

of Table 04h. Temperature measurements below -40NC or above +102NC are clamped to 80h and C7h, respectively.

The calculation of TINDEX is as follows:

Temp_Value 40 C

TINDEX

80h

2 C

+°

For the temperature-indexed LUTs (2NC), the index used during the lookup function for each table is as follows:

Table 04h (DAC)

TINDEX6

TINDEX5

TINDEX4

TINDEX3

TINDEX2

TINDEX1

TINDEX0

For the 8-position LUT tables, the following table shows the lookup function:

TINDEX

1000_0xxx

1001_0xxx

1001_1xxx

1010_0xxx

1010_1xxx

1011_0xxx

1011_1xxx

11xx_xxxx

BYTE

TEMP (NC)

< -8

-8 to +8

+8 to +24

+24 to +40

+40 to +56

+56 to +72

+72 to +88

+88

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

77h

READ ACCESS

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

WRITE ACCESS

N/A

MEMORY TYPE

ROM

86h

BIT 7

BIT 0

Hardwired connections to show the device ID.

DS1877 Datasheet(PDF) 44 Page - Maxim Integrated Products

DS1877 Datasheet(HTML) 44 Page - Maxim Integrated Products

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65

Datasheet Download

Link URL