ams OSRAM AS6221 & AS6221T Digital Temperature Sensors

ams OSRAM AS6221 and AS6221T Digital Temperature Sensors consist of a Si-bandgap temperature sensor, an ADC, and a digital signal processor. These digital temperature sensors communicate via a 2-wire digital bus with other devices. The sensors are designed for use in applications where high measurement accuracy is required, including measuring skin temperature. The AS6221 and AS6221T Sensors can also be used to replace PTC resistors and are ideally suited for mobile/battery-powered applications thanks to the high-temperature accuracy and ultra-low power consumption.

The AS6221 and AS6221T sensors provide ease of use and feature a factory-calibrated sensor, integrated linearization, and the possibility of using eight different I2C addresses, enabling the use of eight AS6221 or AS6221T devices on one bus. Additionally, the temperature sensor system offers alert functionality, which triggers an interrupt to protect devices from excessive temperatures.

The AS6221T Digital Temperature Sensors are calibrated according to NIST, and the verification equipment is calibrated by an ISO/IEC-17025 accredited laboratory.


  • High measurement accuracy of ±0.09°C (+20°C to +42°C)
  • Low power consumption
    • 6µA typical during operation at 4Hz
    • 0.1µA typical standby
  • Supply voltage ranges
    • 1.7V to 3.6V for the AS6221 from 0 to +125°C
    • 1.71V to 1.98V for the AS6221T from 0 to +60°C
  • Small PCB footprint size of 1.5mm x 1mm (6-ball WLCSP)


  • Fitness/health wristbands
  • Personal computers
  • Wearables
  • HVAC
  • Replacement of PTCs
  • Electronic equipment
    • Tablets
    • Convertibles
    • Laptop


  • -0.3V to 4V maximum supply voltage range
  • ±100mA maximum input current
  • Electrostatic discharge (ESD)
    • ±2000V human-body model
    • ±500V charged-device model (AS6221T only)
  • Analog system
    • 16 bits resolution
    • 36ms typical conversion time
    • 20ms maximum supply voltage rise time
    • 50mV/ms minimum supply voltage slew rate
  • Digital system
    • 0.3V to 0.7V input range
    • ±1µA input leakage current
    • 700mV typical hysteresis voltage
    • ±10µA tristate leakage current
  • Moisture Sensitivity Level (MSL) 1
  • Temperature ranges
    • -40°C to +125°C operating
    • -55°C to +125°C storage

AS6221 Block Diagram

Block Diagram - ams OSRAM AS6221 & AS6221T Digital Temperature Sensors

AS6221T Block Diagram

Block Diagram - ams OSRAM AS6221 & AS6221T Digital Temperature Sensors
Published: 2020-12-11 | Updated: 2023-06-01