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CBC34813-M5C-TR5 Datasheet(PDF) 2 Page - Cymbet Corporation

Part # CBC34813-M5C-TR5
Description  Extend Battery Life by Reducing System Power using the EnerChip RTC
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Manufacturer  CYMBET [Cymbet Corporation]
Direct Link  http://www.cymbet.com
Logo CYMBET - Cymbet Corporation

CBC34813-M5C-TR5 Datasheet(HTML) 2 Page - Cymbet Corporation

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AN-1059: Extend Battery Life by Reducing System Power using the EnerChip RTC
©2014 Cymbet Corporation • Tel: +1-763-633-1780 • www.cymbet.com
Doc AN-72-1059 Rev A
Page 2 of 5
Average Power Consumption when Mostly in Sleep State
When the system that has a large sleep power compared to its active power is asleep, there is an opportunity
to reduce power by placing the microcontroller in its lowest power mode while using the CBC348xx RTC timer
functions to provide periodic wake-ups to the microcontroller and associated circuitry. This way the entire
system is totally asleep for the majority of time and the microcontroller is only awakened for short periods
to determine if it needs to service a sensor or switch. The CBC348xx is configured to automatically wake the
system at regular periods for a finite time and then the microcontroller goes back to sleep. The CBC348xx can
also be configured to completely turn off power to the sensors and/or microcontroller by using its internal 1Ω
pull-down switch. If the microcontroller determines during one of its waking intervals that it needs to service
something then it quickly commands the CBC348xx to not automatically shut it down until further commanded.
This technique can reduce the system power greatly since the CBC348xx only requires 36nA of current to
manage the timing functions and the rest of the system can go to its lowest power mode.
The average system power is a function of the time the system needs to run compared to the time it is asleep.
If the microcontroller/system is awakened too often the power savings will be minimal. A simple metric of the
possible savings is to add the sleep current (since it is always present) to the active current times the ratio of
the active time divided by the sleep time. Table 1 below shows some examples of different power savings that
can be achieved with different sleep vs. run times. Column one is the Original Sleep Current of the system
without using the CBC348xx. The Original Sleep Current includes the sleep power of the microcontroller with a
timer running plus any sensor current. The Power Savings Ratio is the Active Current times the ratio of active/
sleep times plus the 36nA CBC348xx current compared to the Original Sleep Current in column one. The
Number of Instructions column shows how many instructions the microcontroller can execute in the period of
time listed in the Active Runtime column. For sake of reference it takes about 28 I2C clocks at 400kHz or about
70µs to write to a single register in the CBC348xx. Make sure to write to the register to disable the timer before
the CBC348xx automatically switches the microcontroller/system power off.
Table 1: Combining Sleep Power and Active Power to Compare Power Savings
Notice that the Power Savings Ratio is only a benefit if it is over 1.0. This table shows that the longer sleep
periods have the best ratios. With higher Original Sleep Currents the benefits are also magnified. The next to
the last line shows a Power Savings Ratio of 6.30 with over 300 instructions executed per wake-up. The system
in this example had an Original Sleep Current of 1.6µA for the microcontroller current with internal sleep timer
and an external sensor. A 6.30 Power Savings Ratio means 6.3 times more battery life in a battery powered
system.
The last line shows a one-second sleep time associated with a slower, environmental sensor. Notice
the large 14.04 Power Savings Ratio in this example. These examples show that a long battery life extension
can easily be achieved using this technique.


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