SI7005-B-FM Ver la hoja de datos (PDF) - Silicon Laboratories
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SI7005-B-FM Datasheet PDF : 40 Pages
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Si7005
4. Functional Description
VDD
VDD
NV CAL
VDD
Humidity
32 kHz Osc
CEXT
Sensor
MUX
ADC
Logic
I2C
Serial
SCL
SDA
Temperature
IF
CS
Sensor
GND
Si7005
PXx
PXy
PXz
Microcontroller
Figure 6. Si7005 Functional Block Diagram
4.1. Overview
The Si7005 is a digital relative humidity and temperature sensor. This monolithic CMOS IC integrates temperature
and humidity sensor elements, an analog-to-digital converter, signal processing, calibration data, and an I2C host
interface. Both the temperature and humidity sensors on each unit are factory-calibrated and the calibration data is
stored in the on-chip non-volatile memory. This ensures that the sensors are fully interchangeable, with no
recalibration or software changes required.
While the Si7005 is largely a conventional mixed-signal CMOS integrated circuit, relative humidity sensors in
general and those based on capacitive sensing using polymeric dielectric have unique application and use
requirements that are not common to conventional (non-sensor) ICs. Chief among those are:
The need to protect the sensor during board assembly, i.e., solder reflow, and the need to subsequently
rehydrate the sensor.
The need to protect the sensor from damage or contamination during the product life-cycle
The impact of prolonged exposure to extremes of temperature and/or humidity and their potential affect on
sensor accuracy
The effects of humidity sensor “memory”
The need to apply temperature correction and linearization to the humidity readings
Each of these items is discussed in more detail in the following sections.
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Rev. 1.3
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