DS1848 datasheet(4/17 Pages) DALLAS

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DS1848

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Memory Location Name of Location

Function of Location

00h to 47h

(the Table Select

Byte, E0h, must be

set to 01h or 02h to

access the Look-

Up Tables)

00h to 7Fh

(the Table Select

Byte, E0h, must be

set to 00h to access

the User EEPROM

Memory)

User Defined Look-Up Table

(LUT)

User Memory

This block contains the user-defined temperature

settings of the resistors. Values between 00h and

FFh can be written to either table to set the 256

position variable resistors. The first address

location, 00h, is used to set the resistor at -40°C.

Each successive memory location will contain the

resistor setting for the previous temperature +2°C.

For example, memory address 01h is the address

that will set the resistor in a -38°C environment.

For default memory settings and programming

the look-up table, refer to the Programming the

Look-Up Table (LUT) section of the datasheet.

This block is for general-purpose user memory.

When shipped from the factory, memory

locations 60h – 6Bh contain the same information

as found in Look-Up Table 1, memory locations

28h – 33h. Memory locations 6Ch – 77h contain

the same information as found in Look-Up Table

2, memory locations 28h – 33h.

E0h

Table Select Byte

Writing to this byte determines if one of the two

72x8 EEPROM look-up tables or the user

EEPROM memory is selected for reading or

writing.

00h (User EEPROM selected)

01h (Look-Up Table 1 selected)

02h (Look-Up Table 2 selected)

E1h

Configuration Byte

TAU – Temperature/Address Update

TEN – Temperature Update Enable

AEN – Address Update Enable

Default setting is 03h, TAU = 1, TEN = 1 and

AEN = 1.

TAU becomes a 1 after a temperature and address

update has occurred as a result of a temperature

conversion. The user can write this bit to 0 and

check for a transition from 0 to 1 in order to

verify that a conversion has occurred.

If TEN = 0, the temperature conversion feature is

disabled. The user sets the resistor in “manual

mode” by writing to addresses F0h and F1h to

control resistors 0 and 1, respectively.

TAU TEN AEN

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