Can PIC16LF1829 can run from CR2032 cell?

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jayanth.devarayanadurga

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Can PIC16LF1829 can run from CR2032 cell?

I have a small remote control board. The only device on the board are PIC16LF1829 and nRF24L04. PIC runs at 3V and nRF24L04 need 3.3V. I want to know can I use CR2032 3V button cell to run the device?
 

jayanth.devarayanadurga said:
Can PIC16LF1829 can run from CR2032 cell?

I have a small remote control board. The only device on the board are PIC16LF1829 and nRF24L04. PIC runs at 3V and nRF24L04 need 3.3V. I want to know can I use CR2032 3V button cell to run the device?
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If battery gives 3V why not, its in workable voltage range of these products. Also PIC16LF1829 can work even on 1,8V.
 
nRF24L01 Chip can work in range 1,9V - 3,6V but your module looks like need 3,3V.

You can try it, or look to get small miniature Li-Po (can be 2032 size even smaller).

 
You can buy some low cost small device and extract battery from device + you get device.

I buy small spy key for around 10eur, extract 180mAh battery which is used in some project and plus get micro camera and recording system on Micro SD Card.... I implement recording system in car in mirror case of windshield to record each car driving with date and time on micro SD card.




 
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    FvM

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Your concern is going to be how much current does the circuitry need and how much can the battery supply. The CR2032 can power that PIC in certain oscillator modes, but not in others. It definitely would not be able to also power the radio module.

The suggested Li-Po may work, but you'll still need to look at how much current it can supply.
 

Looks like 3.3V requirement of the module is just an unfounded guess. Some of the linked documents say the module is good 1.9 to 3.6, like the chip itself. CR2032 is also explicitely mentioned as a possible supply.
 
Two cells in series will double the voltage, but does nothing for current. According to the datasheet for the nRF24L01, it requires about 12mA in receive or transmit mode. You'd need about a dozen CR2032 cells in parallel to provide that. Why don't you use a 9V battery and a voltage regulator?
 

CR2032 has an Ri of about 20 ohms. So it can supply a load of 10 or even 20 mA with respective voltage drop. Battery lifetime will be of course low, but the situation is pretty standard for most keyfob remote controls, e.g. car keys. I presume that the OP is able to perform mAh calculations.
 
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    tpetar

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To test maximum current which battery can give use ampermeter in 1-2A range and short circuit battery on short time.

CR2032 is cheap and one can be sacrificed for knowledge. :smile:
 
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    FvM

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This datasheet shows a nominal discharge of only 0.2mA
Click to expand...
Yes. nominal discharge current is the current which achieves nominal capacity. Reading the datsheet more thoroughly, you see also 300 ohm pulse discharge specified, with respective lower capacity.
 
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    tpetar

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Okay, but 300 ohms still only provides 10mA of current. The radio module will have to be switched on and configured before transmitting or receiving.

I agree with tpetar, we need to do some testing. I have those cells and radio module at home. I may even have that PIC. I'm curious to see if it's possible. I'm also curious why jayanth doesn't just use a larger battery.
 

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