Detailed current consumption during connected mode

RE: Detailed current consumption during connected mode

Ole Morten — Thu, 06 Feb 2014 16:07:03 GMT

This is in line with what I get with our internal tool for such use case (which I also gave in my initial reply), assuming 250 ppm external crystals. If you have good 32 kHz crystal (20 ppm) on both ends, you could get down towards 16 µA. Also, beware that if you use the internal RC, you'll have to add some µA on top of the 250 ppm value, probably ending up at 24-25 µA.

RE: Detailed current consumption during connected mode

Marly — Thu, 06 Feb 2014 15:59:54 GMT

I just want the connected value, 1s interval, latency 0, no data. Based on the figure 9 and on the data that I have found on priduct spec, I get (it took me one hour to solve the hunt). an average value of 7,7mA for 2.2ms, and 3,1uA for 997,8ms => Average value of 20uA. Stan

RE: Detailed current consumption during connected mode

Ole Morten — Thu, 06 Feb 2014 15:55:27 GMT

That is the best suggestion for now, yes. The time in RX and TX will also be dependent on how much data is being transferred. If you have a specific scenario in mind, I'd be happy to run some numbers through our internal tools. I can unfortunately not share the tools themselves, since they include confidential information. To do this, the following details are needed:

32 kHz clock source precision on both Central and Peripheral
connection interval and slave latency, or
advertising interval
data payload

RE: Detailed current consumption during connected mode

Marly — Thu, 06 Feb 2014 14:48:21 GMT

OK, thanks. Is there a table for the precise timing values, or should I extrapolate it from the figure 9 ? Stan

RE: Detailed current consumption during connected mode

Ole Morten — Thu, 06 Feb 2014 12:57:43 GMT

You can find detailed current consumption curves in the S110 SoftDevice Specification. To get numbers for the symbols used, you should refer to the nRF51822 Product Specification.

While in a connection with 1 s interval and 0 dB TX power, transmitting 10 bytes of data per interval, you should see about 20 µA average current consumption.