RE: current cunsumption on advertisement

Håkon Alseth — Tue, 08 Apr 2014 11:25:31 GMT

That should be covered in the nRF51822 Product Specification, under chapter 8.5.2. Nom. current for +4 dBm mode is 16 mA.

RE: current cunsumption on advertisement

balaji — Tue, 08 Apr 2014 11:23:07 GMT

Thanks for the reply Haskon, Please provide some information on, how the transmission power level affect the power consumption? or else point a document which explains it.

Regards, Balaji

RE: current cunsumption on advertisement

Håkon Alseth — Tue, 08 Apr 2014 10:33:16 GMT

Hi Balaji,

For regulatory requirements, I would recommend that you read this white paper: www.nordicsemi.com/.../96163197

As we do not a current calculator, it is hard to give you definite answer to your questions. I would recommend that you look at chapter 8 in the S110 specification for the normal power profile for both connected interval and advertising interval.

As for the maximum time before you're connected with a master with a given interval, this is very hard to tell, as it will be a statistical calculation based on both the central's and peripheral's intervals and how they correlate to each other. We do not have any calculations on this subject.

A generic tip when it comes to increasing battery life time, but still keeping the responsiveness, is to use slave latency. Having a connection interval of 200 ms and a slave latency of 4 will allow the application to skip up to 4 connection intervals (if no new data is present) before it has to respond to the master.

Since proximity fobs usually have LEDs/buzzers which are application specific, I would recommend that you measure the average current on your custom board under it's normal use-cases.

Best regards Håkon