Is it ok doubler circuit for powering nRF52832 custom board

RE: Is it ok doubler circuit for powering nRF52832 custom board

vishal — Wed, 17 Jan 2018 04:22:16 GMT

Thank you............

RE: Is it ok doubler circuit for powering nRF52832 custom board

MartinBL — Tue, 16 Jan 2018 13:16:30 GMT

It is basic electronics. The power supplied to your voltage converter is equal to the power flowing out of your converter (minus some loss inside the converter).

But for the sake of argument, let us say that you have an ideal converter with no loss and that your nRF52 draws a constant current at a constant voltage. Power out of your converter is P=UI. The same goes for the power "pushed" into your converter. If you look at the equation you should see that if the battery voltage decreases then the current has to increase to deliver the same amount of power.

In addition, if you read the datasheet of the MCP1640 you will see that different input voltage will give different efficiency. Lower Vin = lower efficiency. As a cause of this your battery will have to push even more current into the converter to meet the power demands of the nRF52.

RE: Is it ok doubler circuit for powering nRF52832 custom board

vishal — Tue, 16 Jan 2018 04:53:14 GMT

Thanks sir for your reply, I use 10K resistor it is better for me, One of the other problem is for doubler IC MCP1640 i test the current consumption of my single AA battery. The result is different consumption like if i put full charge battery i measure current at MCP1640 input side is 15mA. 2. If i put 1.2V battery current consume is 22mA. 3. If i put low means 1 V battery charge battery the current consumption is increase near about 40mA. Why is happen i think it depend on MCP1640 efficiency, is it possible to increase doubler efficiency upto 90%. As per my measurements as battery voltage discharge the current consumption is increase. Please sir how i can avoid this problem. Because we need to use single AA 1.5v Battery for power supply due easily accessible in India and also battery life is important. Thanks........

RE: Is it ok doubler circuit for powering nRF52832 custom board

MartinBL — Mon, 15 Jan 2018 15:45:45 GMT

If anything, a resistor should help you save current.
That might be an even better solution.

RE: Is it ok doubler circuit for powering nRF52832 custom board

vishal — Wed, 10 Jan 2018 11:39:56 GMT

Hi Sir, Finally we again decide to use momentary switch in my device so now as per my previous question i added circuit diagram here Please sir see again as per your suggestion for use high value resistor i have few question on same following:

If i use 10K for protecting internal diode in nRF52832 SoC is it Ok, then by adding this resistor will be consume more current or this will not affect on current consumption.
Also my confusion is if instead of resistor i use diode for protection reverse voltage at the time of user press switch is it work for long time, or it will consume more current or not due to use diode.

Please sir let me know the above question asap, now we are in final stage design. Thanks.....

RE: Is it ok doubler circuit for powering nRF52832 custom board

MartinBL — Wed, 03 Jan 2018 08:30:26 GMT

Have a look at our Online Power Profiler. An average current consumption of 0.3-0.4mA is completely plausible with connection and advertising intervals that short.

RE: Is it ok doubler circuit for powering nRF52832 custom board

vishal — Tue, 02 Jan 2018 15:38:12 GMT

#define MIN_CONN_INTERVAL MSEC_TO_UNITS(7.5, UNIT_1_25_MS) //old20ms
#define MAX_CONN_INTERVAL MSEC_TO_UNITS(7.5, UNIT_1_25_MS) and slave latency set 0. I have set this 7.5ms interval because i want to sent my ADC data to mobile apps very fast is near about within 12-13 sec 160Kb(12bit ADC value).
First i have develop my code on development board but still not measure current on development board. Because i have only multi meter. How i can reduced this current consumption. Thanks.......

RE: Is it ok doubler circuit for powering nRF52832 custom board

MartinBL — Tue, 02 Jan 2018 14:05:10 GMT

What is your advertising interval? If you are advertising with very short intervals I suppose you can end up drawing that much current.
Have you tested your code on a development kit? Does it draw the same amount of current?
It could also be a peripheral that is still enabled, or the CPU that of some reason turns on and off from time to time. With a multimeter you won't know whether it is a peripheral that continuously draws 0.3-0.4mA or if it is the CPU that rapidly turns on and off because the multimeter shows you an average current consumption value. This is why an oscilloscope showing the current measured over time would be very useful.

RE: Is it ok doubler circuit for powering nRF52832 custom board

vishal — Fri, 29 Dec 2017 13:38:31 GMT

No currently not have oscilloscope or other, but i have multimeter. What wrong in my implementation due to high current consumption this current 4-5mA consume while transmitting data to Android apps using BLE. But while advertising it is near about 0.3-0.4mA. What should i wrong can you tell me. Thanks for your reply...

RE: Is it ok doubler circuit for powering nRF52832 custom board

MartinBL — Fri, 29 Dec 2017 13:21:10 GMT

If you have followed Microchip's reference design I'm sure it should work fine. In the datasheet they claim a quiescent current of maximum 220uA so if you are drawing 4-6mA that suggests that there might be something wrong with your implementation of the nRF52. That current could indicate that your CPU is running continuously. Do you have an oscilloscope or any other way of measuring current over time?