Calculating Power consumption of RTC

Discussion in 'General Electronics Chat' started by Siva_sbj, Oct 18, 2007.

  1. Siva_sbj

    Thread Starter New Member

    Oct 18, 2007
    HI I am designing a battery backup circuit for PCF8583 RTC. The datasheet gives the following info

    supply current
    (clock mode)
    VDD = 5 V 10uA(Typical) 50 uA(max)
    VDD = 1 V 2uA(Typical) 10 uA(max)

    Typical condition Temp = 25 deg C

    I am operating the RTC from 3 V battery.

    How could I calculate the power consumption? Is there any formula or method to calculate the power consumption?

    Thanks in advance.
  2. cumesoftware

    Senior Member

    Apr 27, 2007
    You should consider the data for 5V, for safety. Then, the power consumption would be:
    P = V x I, being V = 3V and I the current for 5V

    Hope it helps!
  3. chulangj

    New Member

    Oct 11, 2007
    view the pdf document and see how it works with a 3v button cell