nrf52832 high consumption

[Nero]

Hello ,

I use nrf52832 in my custom card, I developed everything on the develeppement kits nrf52, and when I merge to the custom card, I remerque that there is a huge consumption (passage 3.5 V has 2,6v in 30 min)
I will be grateful if you can help me

thanks,

[ketil]

Hi Ahmed,

Can you attach your board schematic? 

Also, can you clarify what you mean by (passage 3.5 V has 2,6v in 30 min?

Ketil

[Nero]

Thank you ,
I don't know if it's a problem in my program or hardware

[Nero]

in fact the voltage drops from 3.5 to 2.6 in 30min (measurement of the battery)

[ketil]

We can't see any immediate problems with your schematic. Which battery are you using? You will have to do some power consumption measurements to figure out where the problem is. If you do not have any equipment then the PPK is an cost effective solution.

[Nero]

I use the CR2032 battery , i cant find where is the problem , is anormal consumption

[AmbystomaLabs]

I  am guessing you have unrealistic expectations for a CR2032 battery.  If you look at the specs for these batteries they specify a max continuous load of 0.2mA. 

RX or TX activity will easily draw 10mA which is 50 times greater than the recommended load for a CR2032.

Due to the high internal resistance of a CR2032 during high load you will see a very large drop in output voltage that will generally recover if the battery is allowed to rest for a few seconds. However, this type of operation will significantly reduce the capacity of the battery overall due to to internal losses.

You can only operate a BLE device on a CR2032 with only very light duty and lots of local capacitance. Our designs generally have over 100uF of local capacitance to keep the voltage drop to a minimum.

By the way a CR2032 is considered nominal 3.0volts not 3.5.  Though when brand new their rest voltage will often be 3.3volts.

[Nero]

Thanks ,

how can I use CR2032, like a battery or what you suggest as battery, if not is there a solution to the level of hardware or software to reduce energy consumption

[redsun]

Hello, Ahmed. We using Li-SOCl2 batteries from SAFT for those type of use.