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SI7013-A20-YM0

I2C HUMIDITY AND TWO-ZONE TEMPERATURE SENSOR

Silicon Laboratories 

Si7013-A20

5.1.1. Measuring Relative Humidity

Once a relative humidity measurement has been made, the results of the measurement may be converted to

percent relative humidity by using the following expression:

%RH = 1----2---5-------R----H-----_---C----o----d---e-- – 6

s 65536

n Where:

%RH is the measured relative humidity value in %RH

ig RH Code is the 16-bit word returned by the Si7013

s A humidity measurement will always return XXXXXX10 in the LSB field.

e Note: Due to normal variations in RH accuracy of the device as described in Table 4, it is possible for the measured value of

%RH to be slightly less than 0 when the actual RH level is close to or equal to 0. Similarly, the measured value of %RH

D may be slightly greater than 100 when the actual RH level is close to or equal to 100. This is expected behavior, and it is

acceptable to limit the range of RH results to 0 to 100%RH in the host software by truncating values that are slightly out-

side of this range.

w 5.1.2. Measuring Temperature

Each time a relative humidity measurement is made a temperature measurement is also made for the purposes of

e temperature compensation of the relative humidity measurement. If the temperature value is required, it can be

read using command 0xE0; this avoids having to perform a second temperature measurement. The measure

N temperature commands 0xE3 and 0xF3 will perform a temperature measurement and return the measurement

r value, command 0xE0 does not perform a measurement but returns the temperature value measured during the

relative humidity measurement. The checksum output is not available with the 0xE0 command.

mmended fo The results of the temperature measurement may be converted to temperature in degrees Celsius (°C) using the

o following expression:

ec Temperature (C  = 1----7---5----.-7----2------T----e----m-----p----_---C-----o---d---e-- – 46.85

65536

R Where:

t Temperature (°C) is the measured temperature value in °C

o Temp_Code is the 16-bit word returned by the Si7013

NA temperature measurement will always return XXXXXX00 in the LSB field.

24

Rev. 1.4

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