SI7015-A10 Datasheet, PDF (22/39 Pages) Silicon Laboratories – Excellent long term stability

Si7015-A10
5.1.4. Fast Conversion Mode
The time needed to perform a temperature or RH measurement can be reduced from 5.8 ms (typical) to 2.6 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 Si7015 when making periodic conversions. It also reduces the
resolution of the measurements.
5.1.5. Heater
The Si7015 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 Si7015 is used in conjunction with a separate temperature sensor such as another Si7015.
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).
5.1.6. Device Identification
The Si7015 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. Device ID Revision Values
Device ID Value
D[7:4]
D[3:0]
1111
0000
Device Revision
Type
Level
Si7015
A
22
Rev. 1.0