ams – Accurate relative humidity and temperature sensor IC ideal for space- and power-constrained designs


The ENS210 from ams is a single-die sensor IC providing extremely accurate, pre-calibrated measurements of relative humidity and ambient temperature.

The ENS210 provides a digital temperature output in Kelvin, accurate to a maximum ±0.2°C over the range 0°C to 70°C. It also provides relative humidity measurements as a digital output accurate to a maximum ±3.5%. Shipped to customers as a calibrated unit, the sensor requires no trimming on the production line. It provides its digital outputs over an I2C interface, eliminating the need for signal processing by the host device’s applications processor or microcontroller.

Housed in a moulded plastic surface- mount package measuring just 2mm x 2mm x 0.75mm, the ENS210 is small enough to be accommodated in mobile and wearable devices, such as fitness monitoring wristbands.

Drawing just 40nA in stand-by mode and 7.1μA in active measurement mode (sampling at 1Hz), the ENS210 drains very little energy from the battery in portable applications.

It operates from a wide input-voltage range of 1.71V to 3.6V, which means that systems with a dual 1.8V/3.3V power supply need no additional level-shifting voltage regulator at the point of load.

In home and building automation systems, the ENS210’s readings of relative humidity and temperature may be used in combination with the ams CCS811 or CCS801 gas sensor for accurate assessment of the quality of the indoor environment. The ENS210 may also be combined with smart LED lighting solutions from ams, such as the AS7225 Smart Lighting Director, as part of an IoT sensor hub.


  • 4s response time for relative humidity measurements
  • 1s response time for temperature measurements
  • Excellent long-term stability
  • Optional sensor fusion software


  • Mobile and wearable devices
  • Thermostats
  • Air-conditioning systems and air purifiers
  • Home appliances such as:
    - Refrigerators
    - Clothes dryers
    - Microwave ovens
    - Kitchen air extractors
  • Industrial and medical environmental monitoring systems
  • Paediatric incubators
  • Weather stations