DS1864 datasheet(32/72 Pages) DALLAS

32 / 72 page

SFP Laser Controller and

Diagnostic IC

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Lower Memory Register 26h to 27h: Low MON3 Warning Limit

FACTORY DEFAULT:

0000h

MEMORY TYPE:

Shadowed Memory (SEE)

26h

27h

bit7

bit0

Voltage measurements of the MON3 input below this threshold will set its corresponding warning bit (Lower Memory Register 75h, bit 6).

Measurements above this threshold will automatically clear its warning bit.

Lower Memory Register 28h to 37h: Reserved Memory

28h to 37h

RESERVED

Lower Memory Register 38h to 5Fh: External Calibration Constants

FACTORY DEFAULT:

00h

MEMORY TYPE:

Nonvolatile (EEPROM)

38h TO 5Fh

EEPROM

If external calibration constants are used for calibrating the transceiver module, they can be stored in this section of memory,

reserved for such use under SFF-8472.

Lower Memory Register 60h to 61h: Measured Temperature

FACTORY DEFAULT:

N/A

MEMORY TYPE:

Volatile (SRAM)

60h

61h

-1

-2

-3

-4

-5

-6

-7

-8

bit7

bit0

Signed 2’s complement direct-to-digital temperature measurement.

Lower Memory Register 62h to 63h: Measured VCC

FACTORY DEFAULT:

N/A

MEMORY TYPE:

Volatile (SRAM)

62h

63h

bit7

bit0

Unsigned voltage measurement of VCC.

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