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AS6221 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] -40 to 125
Accuracy ±0.09°C (20°C to 42°C)
Conversion Time [ms] 36

General Description

The AS6221 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 AS6221, is a complete digital sensor system, 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 AS6221 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


Title Category Headline Buy
AS6221 Eval Kit Application Board AS6221 Evaluation Kit
AS6221 Demo Kit Application Board AS6221 Demo Kit


Type Description Language
Driver Linux driver for ams AS62XX temperature sensor EN

Technical Documents

Type Description Language
Datasheet Datasheet for AS6221 English
Application Note Thermal Design Guideline for Wearables English
Application Note Thermal design guideline for PCB reference design English
Product Brief AS6221 features, benefits, applications English

Environmental Documents

Type Description Language
RoHS Certificate AS6221 RoHS Certificate English

Other Information

Type Description Language
Block Diagram AS6221 Block Diagram English
Factsheet High Accuracy Digital Temperature Sensor English
Factsheet Digital Temperature Sensors Factsheet English
Image AS6221 WLCSP Picture English
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