HTS221
Ultra-compact humidity and temperature sensor with 0-100% RH range, ±3.5% RH accuracy, and digital I2C/SPI interface for environmental monitoring applications.
Product Overview
Description
The HTS221 is an ultra-compact sensor for relative humidity and temperature measurement, featuring a capacitive humidity sensor and band-gap temperature sensor.
It offers ±3.5% RH accuracy (20-80% RH range) and ±0.5°C temperature accuracy, with selectable ODR from 1Hz to 12.5Hz.
The device includes an internal calibration engine for factory-calibrated measurements and supports both I2C and SPI digital interfaces.
Product Series
Primary Application
Key Features
- 0-100% RH measurement range
- ±3.5% RH accuracy (20-80% RH)
- ±0.5°C temperature accuracy
- Selectable ODR: 1Hz to 12.5Hz
- Factory calibrated
- Ultra-compact 2x2mm package
- I2C and SPI interfaces
Specifications
| Humidity Range | 0% to 100% RH |
|---|---|
| Humidity Accuracy | ±3.5% RH (20-80%) |
| Temperature Range | -40°C to +120°C |
| Temperature Accuracy | ±0.5°C (15-40°C) |
| Interface | I2C/SPI |
| Package | HLGA-6L (2x2mm) |
| Voltage Rating | N/A |
| Current Rating | N/A |
Applications
Weather stations
Industrial application for Capacitive Digital Humidity and Temperature Sensor
HVAC systems
Industrial application for Capacitive Digital Humidity and Temperature Sensor
Smart home devices
Industrial application for Capacitive Digital Humidity and Temperature Sensor
Industrial monitoring
Industrial application for Capacitive Digital Humidity and Temperature Sensor
Agriculture IoT
Industrial application for Capacitive Digital Humidity and Temperature Sensor
FAE Expert Insights
"The HTS221 is my go-to recommendation for environmental sensing in IoT applications. The combination of humidity and temperature in a tiny 2x2mm package is perfect for space-constrained designs. The factory calibration is a big advantage - you get accurate readings without extensive calibration procedures. The ±3.5% RH accuracy is sufficient for most environmental monitoring applications. I've used this sensor in smart home devices, weather stations, and agricultural monitoring systems with excellent results. The I2C interface is straightforward to implement. Key design tip: the sensor is sensitive to contamination - use a protective mesh or filter in harsh environments. Power consumption is low enough for battery-powered applications. Overall, a reliable and cost-effective environmental sensor."
Compact combined humidity and temperature sensor with factory calibration
— Lisa Chen, BeiLuo
Frequently Asked Questions
What is the recommended operating range for HTS221?
Recommended operating conditions: Humidity: 0-100% RH (non-condensing); Temperature: -40°C to +120°C; Best accuracy in 20-80% RH range. Avoid condensation as it can damage the sensor. For high-humidity environments, consider protective filtering. The sensor can survive brief exposure to condensation but continuous operation in condensing conditions will degrade performance.
Use protective filter in high-humidity or dusty environments.
How often should the sensor be calibrated?
The HTS221 includes factory calibration stored in internal memory. For most applications, no additional calibration is required. However, for critical applications: Verify calibration annually; Re-calibrate if exposed to contaminants; Check against reference standards periodically. The internal calibration engine applies temperature compensation automatically. Long-term drift is typically <0.5% RH per year under normal conditions.
Factory calibration sufficient for most applications. Annual verification for critical use.