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Hi,
I am using the BlueTooth Pioneer kit with the PSoC 4 board and using the AN92854 application note. I am running the BLE_CapSense project and not getting anything near the current predicted. I do not have an aperture type DVM. I have a 10Ω resistor across J15 and have a scope and the DVM across it. Both reading mV. The DVM averages the current to board and would represent the load seen by a batter. We have capacitors in the CKT to handle the BLE transmissions but the average current with give us ~ battery life.
With the application running (and seen by CySmart) using 4000 ms advertisements, I see about 9.3 mV across the resistor or 0.93 ma. I can see the advertisement current spikes on the scope But the average current is the problem, it is nowhere close to the < 10 µ amp shown in the appnote.
Is this what I should expect for the average current in this application ? On the scope I see the advertisement for about 6.4 ms spaced at 4 second intervals. I has a peak of about 500 mv or 50 mA.
The hardware we want to build with this, we hope to run from a 2032 cell (240 mAh) for 6 months for a year. Am I totally wrong in measuring it this way ?
Thanks for the help.
--jim schimpf
Solved! Go to Solution.
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Hello Jim,
I did some measurements too using 2 methods, one described by you and another by simply using a digital ammeter in series with J15. Of course the second method will average the current and more precised measurements should be done with you method!
I can confirm your findings but to be honest a spike of 50 mA is why to much. I have about 193-200 mV using a resistor of 20 Ohms and a clock frequency of 32 MHz, which is about 10 mA. I also suppose that with a clock at 48 MHz( if this is also intended by you to use) the spike will note overcome 14-15 mA, since the clock for BLE is at 24 MHz.
I also used other lets call them benchmarks, where I have analyzed the power consumed by executing only asm code removing all other components for a design, and also using simple BLE application just for advertising, sending, notification, keeping the connected link etc. using the same Application Note AN92584 and after my results on a simple project I can tell you that with a 250 mAh you will have the battery for about 4 days, if my measurements are correct. I still have to test more the system and to remove more unused clocks and other parts in order to obtain better results.
Hopefully this helps.
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Hi,
I am facing similar situation. So, have you solved with the problem, Jim?
Regards,
Daryanto
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No but now I have adapted the code from AN92584 and it is better ~0.200 µamps.
--jim
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So you just used the code from that appnote, but the measurement procedure is still the same? using oscilloscope?
thanks
regards,
Daryanto
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Hello Jim,
I did some measurements too using 2 methods, one described by you and another by simply using a digital ammeter in series with J15. Of course the second method will average the current and more precised measurements should be done with you method!
I can confirm your findings but to be honest a spike of 50 mA is why to much. I have about 193-200 mV using a resistor of 20 Ohms and a clock frequency of 32 MHz, which is about 10 mA. I also suppose that with a clock at 48 MHz( if this is also intended by you to use) the spike will note overcome 14-15 mA, since the clock for BLE is at 24 MHz.
I also used other lets call them benchmarks, where I have analyzed the power consumed by executing only asm code removing all other components for a design, and also using simple BLE application just for advertising, sending, notification, keeping the connected link etc. using the same Application Note AN92584 and after my results on a simple project I can tell you that with a 250 mAh you will have the battery for about 4 days, if my measurements are correct. I still have to test more the system and to remove more unused clocks and other parts in order to obtain better results.
Hopefully this helps.