TH02 datasheet(15/26 Pages) ETC2

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TH02

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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 = ⎛

RH⎞

– 24

16 ⎠

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

12-Bit Relative Humidity Code

Table 11. Typical %RH Measurement Codes for 0 to 100% RH Range

12 Bit Code

%RH

Dec

Hex

384

180

544

220

704

2C0

864

360

1024

400

1184

4A0

1344

540

1504

5E0

1664

680

1824

720

100

1984

7C0

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”.

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