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AS6221T Temperature sensor

High accurate digital temperature sensor


  • High temperature accuracy
  • Ultra-low power consumption
  • Small integration size (WLCSP)
  • Complete sensor system with serial bus connection
  • Alert functionality for exact temperature control


  • Enables high accurate skin temperature measurements
  • Long battery life and low self heating
  • 'Easy to Use' solution, i.e. no calibration or linearization needed
  • Minimal board space and fast reaction time

Product parameters

Interface I²C
Supply Voltage [V] 1.71 to 3.6
Consumption [µA] 6 @ 4 samples/s
Dimension [mm] 1.5 x 1
Ambient Temperature Range [°C] 0 to 60
Accuracy ±0.09°C (20°C to 42°C)
Conversion Time [ms] 36

General description

The AS6221T is a high accurate digital temperature sensor with an accuracy of up to ±0.09°C, which is ideal for healthcare applications, wearables and devices requiring high-performance thermal information. The AS6221T, is a complete digital sensor system and requires no calibration or linearization. It provides measurement outputs via a standard I²C interface. The sensor supports eight I²C addresses avoiding bus conflicts in multi-sensor use cases. The ultra-small size of the sensor (WLCSP 1.5 mm x 1.0 mm) enables accurate body/skin temperature measurements in very small health and lifestyle monitoring products. In addition to the high accuracy and the small form factor, the AS6221T offers a very low power consumption, for example measuring with 4 samples/s, the current consumption is only 6 µA. The sensor has 4 different automatic acquisition modes and keeps the high accuracy over the full supply range from 1.71 to 3.6 V. An integrated alert functionality triggers an interrupt to the micro controller when a temperature threshold is exceeded. The temperature threshold for the alert function can be adjusted in a device register.

This product suits for the following applications:

  • Mobile Health
  • Wearables
  • Fitness trackers and bands
  • Electronic devices
  • Laptops
  • Tablets
  • SSDs
  • PTC replacement

Technical documents

Type Description Language
Datasheet AS6221T datasheet English

Environmental documents

Type Description Language
RoHS Certificate AS6221T RoHS certificate English

Other information

Type Description Language
Block Diagram AS6221T block diagram English
Image High resolution image of AS6221T English
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