DS1620 Просмотр технического описания (PDF) - Maxim Integrated

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DS1620

Digital Thermometer and Thermostat

Maxim Integrated 

Table 3 describes the exact relationship of output data to measured temperature.

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TEMPERATURE/DATA RELATIONSHIPS Table 3

TEMP DIGITAL OUTPUT DIGITAL OUTPUT

(Binary)

(Hex)

+125˚C

0 11111010

00FA

+25˚C

0 00110010

0032h

+½˚C

0 00000001

0001h

+0˚C

0 00000000

0000h

-½˚C

1 11111111

01FFh

-25˚C

1 11001110

01CEh

-55˚C

1 10010010

0192h

DS1620

Higher resolutions may be obtained by reading the temperature, and truncating the 0.5°C bit (the LSB)

from the read value. This value is TEMP_READ. The value left in the counter may then be read by

issuing a READ COUNTER command. This value is the count remaining (COUNT_REMAIN) after the

gate period has ceased. By loading the value of the slope accumulator into the count register (using the

READ SLOPE command), this value may then be read, yielding the number of counts per degree C

(COUNT_PER_C) at that temperature. The actual temperature may be then be calculated by the user

using the following:

TEMPERATURE=TEMP_READ-0.25 + (COUNT_PER_C - COUNT_REMAIN)

COUNT_PER_C

OPERATION–THERMOSTAT CONTROLS

Three thermally triggered outputs, THIGH, TLOW, and TCOM, are provided to allow the DS1620 to be used

as a thermostat, as shown in Figure 3. When the DS1620’s temperature meets or exceeds the value stored

in the high temperature trip register, the output THIGH becomes active (high) and remains active until the

DS1620’s measured temperature becomes less than the stored value in the high temperature register, TH.

The THIGH output can be used to indicate that a high temperature tolerance boundary has been met or

exceeded, or it can be used as part of a closed loop system to activate a cooling system and deactivate it

when the system temperature returns to tolerance.

The TLOW output functions similarly to the THIGH output. When the DS1620’s measured temperature

equals or falls below the value stored in the low temperature register, the TLOW output becomes active.

TLOW remains active until the DS1620’s temperature becomes greater than the value stored in the low

temperature register, TL. The TLOW output can be used to indicate that a low temperature tolerance

boundary has been met or exceeded, or as part of a closed loop system it can be used to activate a heating

system and deactivate it when the system temperature returns to tolerance.

The TCOM output goes high when the measured temperature meets or exceeds TH, and will stay high until

the temperature equals or falls below TL. In this way, any amount of hysteresis can be obtained.

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