DS1629S+T&R【PDF 5/23 页】IC THERM/RTC/CALENDAR DIG 8-SOIC

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Sheet目录39

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DS1629

5 of 23

OPERATIONMEASURING TEMPERATURE

The DS1629 measures temperature using a bandgap-based temperature sensor. A delta-sigma analog-to-

digital converter (ADC) converts the measured temperature to a digital value that is calibrated in 癈; for

癋 applications, a lookup table or conversion routine must be used. The device can be configured to

perform a single conversion, store the result, and return to a standby mode or it can be programmed to

convert continuously. The very first time the DS1629 is powered up from the factory, it begins

temperature conversions and performs conversions continuously. Regardless of the mode used, the last

completed digital temperature conversion is retrieved from the temperature register using the Read

Temperature (AAh) protocol, as described in detail in the Command Set section. Details on how to

change the settings after power-up are contained in the OperationConfiguration/Status Register

section.

The temperature reading is provided in a 9-bit, twos complement format. Table 2 describes the exact

relationship of output data to measured temperature data. The data is transmitted through the 2-wire serial

interface, MSB first. The DS1629 can measure temperature over the range of -55癈 to +125癈 in 0.5癈

increments.

Note that temperature is represented in the DS1629 in terms of a 0.5癈 LSB, yielding the 9-bit format

illustrated in Table 2. Higher resolutions may be obtained by reading the temperature and truncating the

0.5癈 bit (the LSB) from the read value. This value is TEMP_READ. A Read Counter (A8h) command

should be issued to yield the 8-bit COUNT_REMAIN value. The Read Slope (A9h) command should

then be issued to obtain the 8-bit COUNT_PER_C value. The higher resolution temperature may then be

calculated by the user using the following equation:

T = TEMP_READ -0.25 +

COUNT_PER_

IN)

COUNT_REMA

(COUNT_PER

Temperature/Data Relationships Table 2

MSB

MSb

unit = 癈

LSb

-1

LSB

TEMPERATURE

DIGITAL OUTPUT

Bin r

DIGITAL OUTPUT

H x

+125癈

01111101 00000000

7D00h

+25癈

00011001 00000000

1900

?/DIV>

0癈

00000000 00000000

0000

-0.5癈

11111111 10000000

FF80

-25癈

11100111 00000000

E700h

-55癈

11001001 00000000

C900h

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