DS1847 datasheet(4/17 Pages) DALLAS

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DS1847

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Memory

Location

Name of Location

Function of Location

00h to 47h

(Table Select

Byte, E0h, must

be set to 01h or

02h to access the

Look-Up Tables)

User Defined Look-Up Table

(LUT)

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.

E0h

Table Select Byte

Writing to this byte determines which of the two

72x8 EEPROM look-up tables is selected for

reading or writing.

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.

With AEN = 0 the user can operate in a test

mode. Address updates made from the

temperature sensor will cease. The user can load a

memory location into E4h and verify that the

values in locations F0h and F1h are the expected

user-defined values.

TAU TEN AEN

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