CR2032 powering a micro, inrush current question ?

[MadScientist]

It has been suggested to me that I need slew rate limiting on the voltage from a CR2032, when the battery is changed as the low ESR caps are discharged and a relative high inrush occurs that can cause ringing leading to the potential to exceed the micros  absolute max voltage

I would have thought the relatively high ESR of a typical CR2032 lithium cell would self limit

whats the collective wisdom on this , The suggestion being to add a SIP32431 inrush/slew rate limiter chip

Thanks

[MikeK]

A coin cell can't provide large current.  In fact, it's been shown many times that you can connect an LED to a coin cell without a current limiting resistor.

[NiHaoMike]

A coin cell can't provide large current.  In fact, it's been shown many times that you can connect an LED to a coin cell without a current limiting resistor.

Not true with rechargeable coin cells, those can supply a surprising amount of current for their size.

[tszaboo]

1) why dont you measure it?
2) Very unlikely.
3) Maybe add a TVS diode for good measure, but you should have that in any case, because user touching exposed metal parts in your device.

[tooki]

A coin cell can't provide large current.  In fact, it's been shown many times that you can connect an LED to a coin cell without a current limiting resistor.

Not true with rechargeable coin cells, those can supply a surprising amount of current for their size.

Yeah, but the C in CR2032 defines the battery chemistry as a lithium manganese dioxide primary cell, so it’s by definition not a rechargeable cell.

[exe]

low ESR caps are discharged and a relative high inrush occurs that can cause ringing leading to the potential to exceed the micros  absolute max voltage

I feel like counter-acting this "problem" with other solutions (like, slew-rate controllers, etc) will cause other problem. If problem is proven to exist, I'd add a soft-start switch made of a mosfet and gate resistor.

PS Afaik ringing requires inductance. Short traces should also help.

[MadScientist]

Thanks guys