microsystems on silicon


E910.99 PIR Light Controller with DC PWM Dimming and AC Relay Applications


The E910.99(M2011) integrated circuit combines all required functions for a single chip Passive Infra Red (PIR) light controller. The integrated circuit has an internal low dropout voltage regulator allowing for a wide range battery voltages or power supply configurations.

It is designed for load switching with a transistor or a relay in 3 wire AC and DC systems. A conventional PIR sensor connects directly to the PIR input. The pull-down resistor and DC decoupling circuitry are integrated on chip. The PIR signal is converted to a 15 bit digital value.

External potentiometers or resistors are used to set the operating parameters for sensitivity, on-time, brightness, fade, daylight sensor and environment temperature correction. The corresponding voltage levels are converted to digital values with a 4 bit resolution. All signal processing is performed digitally.


  • All types of battery operated lights using LED’s or incandescent globes
  • Solar powered garden lights
  • Low cost DIY automatic lights
  • Extremely low standby power security lights
  • Security applications
  • Day-Night solid-state light switch


  • Single chip solution, minimum external component count
  • Low power consumption
  • On-chip low dropout voltage regulator
  • 4 Adjustable parameters
  • Temperature compensation input
  • Superior digital signal processing
  • Very fast settle time on power up