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

Sensirion SHT4xA Relative Humidity/Temperature Sensors

Features

Specifications

Functional Block Diagram

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