Sensirion SHT4xA Relative Humidity/Temperature Sensors
Sensirion SHT4xA Relative Humidity/Temperature Sensors are 16-bit, high-accuracy, automotive-grade digital sensors for measuring relative humidity and temperature with different accuracy gradings. These sensors fulfill demanding automotive reliability requirements such as +85°C/85%RH accelerated life tests. Interface options include I2C or pulse-width modulation (PWM), and an integrated heater allows advanced onboard diagnostics. The sensor element is designed for reliable operation in harsh conditions such as condensing environments. Suitable for surface mount technology (SMT) processing, the four-pin dual-flat-no-leads package can also be ordered with a wettable flanks option.
Features
- Up to ±2% relative humidity (RH) accuracy
- Temperature accuracy up to ±0.2°C
- I2C fast mode plus and CRC checksum
- Pulse-width modulation (PWM) interface
- Designed for +85°C/85%RH reliability testing
- Fully functional in condensing environments
- Variable power heater
- AEC-Q100 qualified, high-reliability design
- Patented protection options
- QFN package, wettable flank option available
- Operating ranges
- 0 to 100% RH
- -40°C to +125°C temperature range
Specifications
- Supply voltages
- 1.6V to 3.6V for SHT4xA-xxLx
- 2.3V to 5.5V for SHT4xA-xx1x
- 3.0V to 5.5V PWM
- Power-up/-down levels
- 0.6V to 1.2V for SHT4xA-xxLx
- 0.7V to 2.3V for SHT4xA-xx1x
- ESD
- 4kV human body model (HBM)
- 750V charge device model
- Supply currents
- 18µA typical idle state
- 320µA typical PWM measurement, 500µA maximum
- 18µA to 20µA typical repeatability range
- 50µA PWM
- 390Ω or 820Ω typical pull-up resistance
- 0.4V maximum low-level output
- 95Hz to 150Hz PWM frequency range
- 2Hz typical measurement frequency
Functional Block Diagram
Related Development Tools
Sensirion SEK-SHT40A-AD1B Temperature Evaluation Kit
Used to evaluate the SHT40A Relative Humidity/Temperature Sensors.
Sensirion SEK-SensorBridge Environmental Sensing Kit
Enables the development of sensor applications with proprietary plug-and-play hardware.
Related Sensors
Sensirion SHT4x Digital Humidity & Temperature Sensors
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Sensirion SHT4xI Relative Humidity & Temperature Sensors
Offers a 2.3V to 5.5V supply voltage range, 21µA average current rating, & an I2C output interface.