DS1864 datasheet(46/72 Pages) DALLAS

46 / 72 page

SFP Laser Controller and

Diagnostic IC

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Table 03h, 80h to C7h: Temperature Lookup Table For DAC1

FACTORY DEFAULT:

00h

MEMORY TYPE:

Nonvolatile (EEPROM)

80h to C7h

EEPROM

bit7

bit0

This is the lookup table (LUT) for the DAC1 settings.

Table 04h (Table 01h in DS1859 Configuration), 80h: Mode

POWER-ON VALUE:

0Bh

MEMORY TYPE:

Volatile (SRAM)

80h

FT_enable

SEE

TEN

AEN

bit7

bit0

This byte controls the different modes of the DS1864. It controls the analog-to-digital updates, the shadowed EEPROM functionality

and the fast-trip comparators.

bit7:4

Value is 0.

bit3

FT_enable: Determines if the fast-trip comparators used to set fast-trip alarms are enabled or

disabled.

0 = Fast-trips are disabled.

1 = Fast-trips are enabled.

bit2

SEE: Determines if the Shadowed EEPROM acts like SRAM or EEPROM.

0 = Acts like EEPROM (Nonvolatile).

1 = Acts like SRAM (Volatile).

bit1

TEN: Determines if the temperature conversions are enabled or disabled.

0 = Temperature conversions disabled. DAC0 and DAC1 settings can be controlled manually by

writing to registers 82h and 83h in Table 04h (Table 01h in DS1859 configuration).

1 = Temperature conversions enabled. Lookup tables in automatic control mode. (default)

bit0

AEN: Determines if the address calculations from the LUT are enabled or disabled. This bit controls a

test mode setting that can allow manual control over the temperature index, Table 04h (Table 01h in

DS1859 configuration), Register 81h.

0 = Test mode. Manual control over Temperature Index enabled.

1 = Normal operation. Temperature index calculations automatically carried out.

Table 04h (Table 01h in DS1859 Configuration), 81h: Temperature Index Byte

FACTORY DEFAULT:

00h until first temperature conversion.

MEMORY TYPE:

Volatile (SRAM)

81h

bit7

bit0

This byte is the temperature calculated index used to select the address of DAC settings in the lookup tables.

Table 04h In Default DS1852 Configuration, (Table 01h in DS1859 Configuration)

Table 03h Register Descriptions

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