One-chip ultracompact passive IR sensor, the AK9750 is suitable for human detection

AKM AK9750

Adding to InSb quantum-type IR sensor IR1011 proven in the market, Asahi Kasei Microdevices Corp. (AKM) has developed the AK9750 which integrates four IR sensor elements and a signal processing IC. The AK9750 can achieve the human detection function easily because it employs a PIR (Passive Infrared Ray) type infrared-ray sensor and includes a field of view limiter and optical filter in order to limit detection area. The AK9750 provides 16-bit digital output in I2C format after calibrating an offset and gain variation of each sensor element by the signal processing IC.

This device can detect human presence not only in motion but also not in motion because it converts an IR of human body to electrical signal directly. The AK9750 is suitable for PC, IoT applications, and household equipment as IR sensors.

InSb quantum-type IR sensor element

The AK9750 employs an ultra-small quantum-type InSb photodiode based on AKM’s Hall effect element process technology. The photodiode acts as an IR sensor element that can detect IR in high sensitivity and fast response.

High-performance human detection

Since center points of four sensor covering areas are different with the field of view limiter, four IR sensor elements can detect space distribution of a heat source. The AK9750 can achieve high performance human detection using sensor element differential signals of the space distribution.

Calibration free IR sensors

The four IR sensors’ offset and gain variations are calibrated and those data are written into the internal EEPROM at shipment. A system calibration is not necessary by users.

AK9750 Block Diagram
AK9750 Block Diagram.


  • Integrated 4ch IR sensors
  • Integrated optical filter
  • I2C interface
  • 16 bit digital output
  • Interrupt function by INT pin (Open drain)
  • Temperature sensor output range: –10 ~ 60 °C
  • Power supply: 1.71 ~ 3.63 V
  • Current consumption:
    • Max.100 μA (Continuous mode),
    • Max.1 μA (Power down mode)
  • Package: 10-pin SON (4.6 × 3.8 × 1.2 mm)

1-4 Layer PCBs $2

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