calibrated silicon labs si7020-a20-gm1r sensor for humidity and temperature sensing in white goods
Product Overview
The Si7020-A20 is an I2C Humidity and Temperature Sensor from Silicon Laboratories. This monolithic CMOS IC integrates humidity and temperature sensor elements, an analog-to-digital converter, signal processing, and calibration data. It offers precision sensing with low drift, hysteresis, and excellent long-term stability, thanks to its patented use of low-K polymeric dielectrics. The sensor is factory-calibrated and fully interchangeable. Available in a 3x3 mm DFN package, it serves as a drop-in upgrade for existing sensors, providing higher precision and lower power consumption. An optional factory-installed cover protects the sensor from liquids and particulates. It is ideal for applications requiring accurate humidity, dew-point, and temperature measurements, including HVAC/R, thermostats, respiratory therapy, white goods, and asset tracking.
Product Attributes
- Brand: Silicon Laboratories
- Model: Si7020-A20
- Package: 3x3 mm DFN
- Optional Feature: Factory-installed cover
- Certifications: Not specified
- Material: Not specified
- Color: Not specified
- Origin: Not specified
Technical Specifications
| Parameter | Symbol | Min | Typ | Max | Unit | Notes |
| Recommended Operating Conditions | ||||||
| Power Supply | VDD | 1.9 | 3.6 | V | ||
| Operating Temperature (I and Y grade) | TA | 40 | +125 | C | ||
| Operating Temperature (G grade) | TA | 40 | +85 | C | ||
| General Specifications | ||||||
| Input Voltage High | VIH | 0.7xVDD | V | SCL, SDA pins | ||
| Input Voltage Low | VIL | 0.3xVDD | V | SCL, SDA pins | ||
| Input Voltage Range | VIN | 0.0 | VDD | V | SCL, SDA pins with respect to GND | |
| Input Leakage | IIL | 1 | A | SCL, SDA pins | ||
| Output Voltage Low | VOL | 0.6 | V | SDA pin; IOL = 2.5 mA; VDD = 3.3 V | ||
| Output Voltage Low | VOL | 0.4 | V | SDA pin; IOL = 1.2 mA; VDD = 1.9 V | ||
| Current Consumption (RH conversion) | IDD | 150 | 180 | A | ||
| Current Consumption (Temp conversion) | IDD | 90 | 120 | A | ||
| Standby Current (40 to +85 C) | IDD | 0.06 | 0.62 | A | No conversion or I2C transaction in progress. Typical values measured at 25 C. | |
| Standby Current (40 to +125 C) | IDD | 0.06 | 3.8 | A | No conversion or I2C transaction in progress. Typical values measured at 25 C. | |
| Peak IDD during powerup | IDD | 3.5 | 4.0 | mA | Occurs once during powerup. Duration is <5 msec. | |
| Peak IDD during I2C operations | IDD | 3.5 | 4.0 | mA | Occurs during I2C commands for Reset, Read/Write User Registers, Read EID, and Read Firmware Version. Duration is <100 s when I2C clock speed is >100 kHz. | |
| Heater Current | IHEAT | 3.1 | 94.2 | mA | Additional current consumption when HTRE bit enabled. | |
| Conversion Time (12-bit RH) | tCONV | 10 | 12 | ms | Initiating a RH measurement will also automatically initiate a temperature measurement. | |
| Conversion Time (14-bit temperature) | tCONV | 7 | 10.8 | ms | Initiating a RH measurement will also automatically initiate a temperature measurement. | |
| Powerup Time (VDD 1.9 V to ready, 25 C) | tPU | 18 | 25 | ms | ||
| Powerup Time (VDD 1.9 V to ready, full temp range) | tPU | 80 | ms | |||
| Powerup Time (after software reset) | tPU | 5 | 15 | ms | ||
| I2C Interface Specifications | ||||||
| Hysteresis | VHYS | 0.05 x VDD | V | High-to-low versus low-to- high transition | ||
| SCLK Frequency | fSCL | 400 | kHz | |||
| SCL High Time | tSKH | 0.6 | s | |||
| SCL Low Time | tSKL | 1.3 | s | |||
| Start Hold Time | tSTH | 0.6 | s | |||
| Start Setup Time | tSTS | 0.6 | s | |||
| Stop Setup Time | tSPS | 0.6 | s | |||
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