TH02

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3.1.3. Fast Conversion Mode

The time needed to perform a temperature or RH measurement can be reduced from 35 ms (typical) to 18 ms

(typical) by setting FAST (D5) in CONFIG (register 0x03). Fast mode reduces the total power consumed during a

conversion or the average power consumed by the TH02 when making periodic conversions. It also reduces the

resolution of the measurements. Table 14 is a comparison of the normal and fast modes.

Table 14. Normal vs. Fast Mode

Value

Parameter

Normal Mode

Fast Mode

35 ms

18 ms

Temperature resolution

14-bit

13-bit

RH resolution

12-bit

11-bit

3.1.4. Heater

The TH02 relative humidity sensor contains an integrated, resistive heating element that may be used to raise the

temperature of the humidity sensor. This element can be used to drive off condensation or to implement dew-point

measurement when the TH02 is used in conjunction with a separate temperature sensor such as another TH02.

The heater can be activated by setting HEAT (D1) in CONFIG (register 0x03). Turning on the heater will reduce the

tendency of the humidity sensor to accumulate an offset due to "memory" of sustained high humidity conditions.

When the heater is enabled, the reading of the on-chip temperature sensor will be affected (increased).

3.1.5. Device Identification

The TH02 device and its revision level can be determined by reading ID (register 0x11). Table 15 lists the values

for the various device revisions and may include revisions not yet in existence.

Table 15. Revision Values

Device ID Value

D[7:4]

D[3:0]

Device

Type

Revision

Level

0101

0000

TH02

B