TH02 Datasheet, PDF (15/26 Pages) List of Unclassifed Manufacturers – D IGITAL I 2C H UMIDITY AND TEMPERATURE S ENSOR

TH02
3. Host Interface
3.1. I²C Interface
The TH02 has an I²C serial interface with a 7-bit address of 0x40. The TH02 is a slave device supporting data
transfer rates up to 400 kHz. Table 24 shows the register summary of the TH02.
3.1.1. Performing a Relative Humidity Measurement
The following steps should be performed in sequence to take a relative humidity measurement:
1. Set START (D0) in CONFIG to begin a new conversion
2. Poll RDY (D0) in STATUS (register 0) until it is low (= 0)
3. Read the upper and lower bytes of the RH value from DATAh and DATAl (registers 0x01 and 0x02),
respectively. Table 10 shows the format of the 12-bit relative humidity result.
4. Convert the RH value to %RH using the following equation:
%RH = _⎝⎛^R--₁---_6H---_⎠⎞ – 24
where RH is the measured value returned in DATAh:DATAI
5. Apply temperature compensation and/or linearization as discussed elsewhere in this data sheet
Table 11 shows the 12-bit values that correspond to various measured RH levels.
Table 10. 12-Bit Relative Humidity 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
12-Bit Relative Humidity Code
0
0
0
0
Table 11. Typical %RH Measurement Codes for 0 to 100% RH Range
%RH
0
10
20
30
40
50
60
70
80
90
100
12 Bit Code
Dec
Hex
384
180
544
220
704
2C0
864
360
1024
400
1184
4A0
1344
540
1504
5E0
1664
680
1824
720
1984
7C0
The above sequence assumes normal mode, i.e., t_CONV = 35 ms (typical). Conversions may be performed in fast
mode. See section “5.1.3. Fast Conversion Mode”.
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