Document
Si7050/1/3/4/5-A20/1
I2C TEMPERATURE SENSORS
Features
High Accuracy Temperature
Accuracy maintained over the
Sensors
entire operating temperature and
Si7051: ±0.1 °C (max)
voltage range
Si7053: ±0.3 °C (max)
Low Power Consumption
Si7054: ±0.4 °C (max)
195 nA average current @ 1 Hz
Si7055: ±0.5 °C (max)
sample rate
Si7050: ±1.0 °C (max)
14-bit resolution
Wide operating voltage
Factory calibrated
(1.9 to 3.6 V) –40 to +125 °C operating range
I2C interface 3x3 mm DFN package
Applications
HVAC/R Thermostats White goods Computer equipment Portable consumer devices
Asset tracking Cold chain storage Battery protection Industrial controls Medical equipment
Ordering Information: See page 19.
Pin Assignments
Top View
Description
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 14bit 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 195 nA 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.
Patent Protected. Patents pending
Rev. 1.2 11/21
Copyright © 2021 by Silicon Laboratories
Si7050/1/3/4/5-A20/1
Si7050/1/3/4/5-A20/1
Functional Block Diagram
2
Rev. 1.2
TABLE OF CONTENTS
Si7050/1/3/4/5-A20/1
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
5. I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 5.1. Issuing a Measurement Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 5.2. Reading and Writing User Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 5.3. Electronic Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 5.4. Firmware Revision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
6. Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 6.1. Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
7. Pin Descriptions: Si705x (Top View) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
8. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
9. Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 9.1. Package Outline: 3x3 6-Pin DFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
10. PCB Land Pattern and Solder Mask Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
11. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 11.1. Si705x Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 11.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 11.3. Si7055-A20-ZM (Matte Tin Finish Lead Frame) Top Marking . . . . . . . . . . . . . . . . .23 11.4. Si7055-A20-ZM (Matte Tin Finish Lead Frame) Top Marking Explanation . . . . . . .23
12. Additional Reference Resources . ..