SI7050-A20 Datasheet, PDF (11/26 Pages) Silicon Laboratories – IC TEMPERATURE SENSORS

4. Functional Description
Vdd
Si705x
Voltage
Regulator
Si7050/3/4/5-A20
Calibration
Memory
Temp
Sensor
ADC
Control Logic
1.25V
Ref
I²C Interface
SDA
SCL
GND
Figure 3. Si705x Block Diagram
The Si705x Digital Temperature Sensors offer industry-leading low power consumption and high accuracy across
the entire operating voltage and temperature range. These monolithic CMOS ICs feature a band-gap temperature
sensor element, an analog-to-digital converter with up to 14-bit resolution, signal processing, calibration data, and
an I²C interface. The patented use of novel signal processing and analog design enables the sensors to maintain
their accuracy over a wide temperature and voltage range, while consuming very little current.
The temperature sensors 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.
The Si705x devices are available in a 3x3 mm DFN package, and the industry-standard I²C interface can operate
at up to 400 kHz. Requiring just 195nA of average current when sampled once per second, the Si705x can operate
for several years with just a single coin cell battery.
The Si705x devices offer an accurate, low-power, factory-calibrated digital solution ideal for measuring
temperature in applications ranging from HVAC/R and asset tracking to industrial and consumer platforms.
Rev. 1.0
11