Energy Buffering for cr2032 battery

[Letho]

Hello,

I’m designing a custom nrf52832 device and i came across an issue with energy buffering. I am using inside of the device the battery CR2032, SoC nrf52832 and two proximity sensors VCNL3040 ( https://www.vishay.com/docs/84917/vcnl3040.pdf ). Those sensors have pulse current up to 200mA for a few mili seconds (as you can see on attached image), but the battery is rated only for 0.2 mA load. The problem is, those hight current pulses cause capacity drop and voltage drop of the battery, and on the end also cause hard restart of the device.

I was wondering, if you have some example design for energy buffering that would be suitable for my use case.

One more important thing is, the device is designed for long battery life, and most of the time is in sleep mode, therefore has the average power consumption of around 5 uA.

Thank you.

Best Regards,
Tomas

[Jared]

Hi,

Letho said:

I was wondering if you don't have any idea (or, ideally, more example designs) of how to buffer energy. The only thing I found so far is using buck convertor in combination with super capacitor (as described here: https://www.ti.com/tool/PMP9753) . 

But would the super capacitor be able to store as much as the coin cell? Or were you thinking of doing a hybrid solution?

I'm sorry, but I'm not that very experienced in exactly this. Maybe you should try posting in some alternative electronic forum?

regards

Jared