DS1620 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1620

Digital Thermometer and Thermostat

Dallas Semiconductor -> Maxim Integrated 

TEMPERATURE MEASURING CIRCUITRY Figure 2

SLOPE ACCUMULATOR

DS1620

PRESET

COMPARE

LOW TEMPERATURE

COEFFICIENT OSCILLATOR

COUNTER

PRESET

SET/CLEAR

LSB

INC

=0

TEMPERATURE REGISTER

HIGH TEMPERATURE

COEFFICIENT OSCILLATOR

COUNTER

STOP

=0

This calculation is done inside the DS1620 to provide 0.5°C resolution. The temperature reading is

provided in a 9–bit, two’s complement reading by issuing a READ TEMPERATURE command. Table 1

describes the exact relationship of output data to measured temperature. The data is transmitted serially

through the 3–wire serial interface, LSB first. The DS1620 can measure temperature over the range of

-55°C to +125°C in 0.5°C increments. For Fahrenheit usage, a lookup table or conversion factor must be

used.

TEMPERATURE/DATA RELATIONSHIPS Table 1

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

Since data is transmitted over the 3–wire bus LSB first, temperature data can be written to/read from the

DS1620 as either a 9–bit word (taking RST low after the 9th (MSB) bit), or as two transfers of 8–bit

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