# Calculating Power consumption of RTC

#### Siva_sbj

Joined Oct 18, 2007
1
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?

#### bloguetronica

Joined Apr 27, 2007
1,453
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?

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!

#### chulangj

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

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