SI7005-B-GM データシートの表示（PDF） - Silicon Laboratories

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SI7005-B-GM

DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR

Silicon Laboratories 

Si7005

5.1.2. Performing a Temperature Measurement

The following steps should be performed in sequence to take a temperature measurement:

6. Set START (D0) and TEMP (D4) in CONFIG (register 0x03) to begin a new conversion, i.e., write CONFIG with

0x11

7. Poll RDY (D0) in STATUS (register 0) until it is low (=0)

8. Read the upper and lower bytes of the temperature value from DATAh and DATAl (registers 0x01 and 0x02),

respectively

Table 16 shows the format of the 14-bit temperature result. This value may be converted to °C using the following

equation:

TemperatureC

=





T-----E-3---M2-----P---

– 50

where TEMP is the measured value returned in DATAh:DATAI.

Table 17 shows the 14-bit values that correspond to various measured temperature levels.

Table 16. 14-Bit Temperature Result Available in Registers 1 and 2

DATAh

DATAI

D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

14-Bit Temperature Code

0

0

The above sequence assumes normal mode, i.e., tCONV = 35 ms (typical). Conversions may be performed in fast

mode. See section “5.1.3. Fast Conversion Mode”.

20

Rev. 1.3

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