Need long battery life with fast connection interval

[Dawei]

We need fast response from peripheral to central. That means we need a fast connection interval. We are using less than 100mS. But that results in an unacceptable battery life. We are trying different strategies to address this problem. One idea is to have a longer connection interval after some period of non-use. But this takes several seconds to renegotiate the connection parameters. Anyone got some idea about this?  I would think this is a common problem that has a solution.

[Simonr]

Hi

Have you checked out my colleague Scott's current consumption guide where he goes through all the most common ways to optimize power consumption on nRF52 designs? The connection interval should not be detrimental to your current consumption, so please check out the guide for some suggestions. What is I.E. the connection supervision timeout in your application and advertising interval?

Best regards,

Simon

[Dawei]

We have a small battery in the peripheral, about 150-200mAh. If we have a 100mS connection interval, that is about 44uA (According to online power profiler), even when using all the normal power saving efforts, the life is too short. About 70 days battery half life. We would like to have at least double that.

How would the supervision timeout effect the power consumption?

[mrono]

Have you already considered slave latency? That might be enough for your power requirement.

A 100ms interval with a slave latency of 10 would mean you only need to communicate once per second. And there would be no need to renegotiate, it would be up to the peripheral to decide whether to communicate every 100ms or not.