Energy Management from Dusk to Dawn - Automatically

Renesas ASSP device TIMR-IS1 is a digital IC that integrates an astronomical calculator. The configuration input parameters for the astronomical function are configured via the input pins. A built-in Astro function takes geographic location inputs from the provided switch inputs and calculates the sunrise and sunset timings for the entire Indian and sub-continents with 1204 cities.


Key Features

  • Allows energy saving via programming of time and geographical area of installation
  • Random On Time delay (up to 59sec) for street light mode
  • Daily automatic regulation of sunrise and sunset time
  • Suitable to program the coordinates of the city through an easy interface via dip switches
    • Latitude and longitude information is stored for 1204 cities – DIP switch 1
    • City can be selectable through a dip switch – DIP switch 2
    • Off Time can be programmable through a dip switch- DIP switch 3, enabling energy management
  • Separate (RTC) clock battery is present and can be programmable through UART
  • Manual On/Off is present
  • Enables energy management

Technical Specifications

  • Supply voltage (1 phase): 110VAC to 240VAC
  • Power consumption (Max.): 4VA
  • Battery backup: Minimum 6 years running reserve
  • LED indication: Red LED for relay status
  • Contact arrangement: 1 C/O (SPDT)
  • Contact rating: 16A (NO) and 5A (NC) at 240VAC/24VDC
  • Incandescent lamps: 1000W
  • Inductive load (Cos o = 0.6): 6A at 250VAC
  • Clock accuracy: Features RTC with built-in 32.768KHz
  • DTCXO, high stability (UB ± 5.0 x 10-6 / -40 °C to +85 °C (Equivalent to 13secs per month deviation)


  • Domestic Applications
    • Gate lights
    • Outside lights
    • Home illuminations
    • Parking
    • Home automation
  • Commercial Applications
    • Street illuminations
    • Road sign illuminations
    • Shopping center illuminations (luminous signboards)
    • Park/Garden illuminations
    • Parking illuminations

Related Products

Microcontroller: RL78/G1x