SI7013-A20 데이터 시트보기 (PDF) - Silicon Laboratories
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SI7013-A20 Datasheet PDF : 45 Pages
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Si7013-A20
5.5. Firmware Revision
The internal firmware revision can be read with the following I2C transaction:
Slave
S
W
A
0x84
A
Address
0xB8
RA
FWREV
The values in this field are encoded as follows:
0xFF = Firmware revision 1.0
NA
P
A
Slave
S
Designs Address
0x20 = Firmware revision 2.0
5.6. Heater
w The Si7013 contains an integrated resistive heating element that may be used to raise the temperature of the
e sensor. This element can be used to test the sensor, to drive off condensation, or to implement dew-point
measurement when the Si7013 is used in conjunction with a separate temperature sensor such as another Si7013
N (the heater will raise the temperature of the internal temperature sensor).
r The heater can be activated using HTRE, bit 2 in User Register 1. Turning on the heater will reduce the tendency
of the humidity sensor to accumulate an offset due to "memory" of sustained high humidity conditions. Several
fo different power levels are available. The various settings are adjusted using User Register 3 and are described in
Table 20.
d Table 20. Heater Control Settings
e HEATER[3:0] Typical Current
d Draw* (mA)
n0000
3.09
e0001
9.18
m 0010
15.24
...
...
m 0100
27.39
co ...
...
e 1000
51.69
...
...
t R 1111
94.20
No *Note: Assumes VDD = 3.3 V.
Rev. 1.4
31
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