nrf51422 does not advertise with low voltage battery

RE: nrf51422 does not advertise with low voltage battery

Øyvind Karlsen — Tue, 21 Jun 2016 06:16:33 GMT

I agree with Dave here. You should also be careful that you consider the specified pulse draw in the product specification for your battery. If you draw a lot of current from a battery that does not support it you will see significant voltage drop, which can cause power fail resets.

RE: nrf51422 does not advertise with low voltage battery

Dave_couling — Mon, 20 Jun 2016 20:45:20 GMT

If your lack of capacitance that isn't the root cause of your issue, it certainly will become an issue for you in the future. Capacitors help lower the peak currents drawn from the Battery. This is crucial for coin-cell batteries which do not act well under pulse-current draw. I'd add 47uF (min) to help reduce the load on your battery.

RE: nrf51422 does not advertise with low voltage battery

nirmal@nordic — Mon, 20 Jun 2016 18:42:56 GMT

I dont have any capacitors to the input power line please see the image attached here

RE: nrf51422 does not advertise with low voltage battery

Dave_couling — Mon, 20 Jun 2016 18:24:27 GMT

How much capacitance do you have on your power line?

Advertising pings are the most power-intensive things the radio can do. The 22uA you are measuring is the average current, but not the peak current. At the peak current, there will be voltage-drop across the battery's IR. This can cause a voltage-brown out at Low Battery where the IR is above 60ohms.