microsystems on silicon


PIR Signal Processor


The E910.91A integrated circuit is specifically designed for interfacing Passive Infra-red Sensors with micro controllers or processors. The serial communications with the micro controller uses only 1 pin. Multiple E910.91A devices can easily be operated at the same time.

One or 2 PIR sensor can be connected to the two PIRIN analog inputs of the device. The differential signal is converted to a digital value using a high resolution sigma-delta converter in combination with advanced DSP techniques. The 15 bit digital value is made available to an external micro controller via a single wire serial interface (DOCITM).

The E910.91A allows longer distances between the PIR and the micro controller. The signal processing on the micro controller is reduced due to the integrated low pass filter on the E910.91A.


  • Advanced and normal movement detectors
  • Energy savings applications


  • High resolution
  • Fast settling time
  • Single wire serial interface (DOCITM)
  • Operating voltage down to 3.3V
  • Low current consumption
  • High Signal to Noise ratio
  • High power supply rejection


  • See E931.06 datasheet