Battery Monitor Circuit- Need Help - Electronic Circuits Projects Diagrams Free

rainyday101 · 29th August 2008, 02:33 PM

Hi, New here, been out of the electronics field for a bit and need some help with a circuit. I need to build a battery monitoring circuit that will monitor two AA cells and light a LED when the voltage for these cells is low. I guess that trip point to be around 2.1 to 2.4 Vdc. I have searched the internet and found voltage monitoring IC's etc. by Panasonic and ON Semiconductor, but none are readily available. These also have 3000 part min. qty. orders. I did manage to get some samples from ON Semi for a NCP301LSN22T1G voltage detector. They are microscopic and I will never be able to solder any thing to them! Can I use a comparator circuit? LM393? Any help would be appreciated!

ericgibbs · 29th August 2008, 02:35 PM

Quote:

Originally Posted by rainyday101

Hi, New here, been out of the electronics field for a bit and need some help with a circuit. I need to build a battery monitoring circuit that will monitor two AA cells and light a LED when the voltage for these cells is low. I guess that trip point to be around 2.1 to 2.4 Vdc. I have searched the internet and found voltage monitoring IC's etc. by Panasonic and ON Semiconductor, but none are readily available. These also have 3000 part min. qty. orders. I did manage to get some samples from ON Semi for a NCP301LSN22T1G voltage detector. They are microscopic and I will never be able to solder any thing to them! Can I use a comparator circuit? LM393? Any help would be appreciated!

hi,
The ICL8211 ic a battery monitor.

datasheet at: www.datasheetarchive.com

rainyday101 · 29th August 2008, 02:49 PM

Thanks, I looked up the IC and like it, but it is microscopic in size! That is about the size of the ones I have from ON Semi. With it that small I wouldn't circuit board mount it and would need to solder wires to the legs. I don't have anything to solder that small and maybe the ability to do so. In my time away from this field I can't believe how small things have gotten! Any ideas appreciated. Thanks.

KMoffett · 29th August 2008, 03:00 PM

Look for a MAX8211CPA:

http://www.newark.com/68K5030/semico...questid=127695

Newark Electronics...in an 8-Pin DIP.

Ken

Willbe · 29th August 2008, 03:30 PM

Quote:

Originally Posted by rainyday101

I need to build a battery monitoring circuit that will monitor two AA cells and light a LED when the voltage for these cells is low. I guess that trip point to be around 2.1 to 2.4 Vdc.
Can I use a comparator circuit?

Yes, use a comparator with hysteresis and a bandgap voltage reference. Piece 'o cake!

rainyday101 · 29th August 2008, 03:30 PM

Thanks!!!! That is exactly what I am looking for!!!

ericgibbs · 29th August 2008, 04:08 PM

Quote:

Originally Posted by rainyday101

Thanks, I looked up the IC and like it, but it is microscopic in size! That is about the size of the ones I have from ON Semi. With it that small I wouldn't circuit board mount it and would need to solder wires to the legs. I don't have anything to solder that small and maybe the ability to do so. In my time away from this field I can't believe how small things have gotten! Any ideas appreciated. Thanks.

hi,
Its also an 8pin DIL plug in package as well a SMT..

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29th August 2008, 02:33 PM	(permalink)
rainyday101	Battery Monitor Circuit- Need Help Hi, New here, been out of the electronics field for a bit and need some help with a circuit. I need to build a battery monitoring circuit that will monitor two AA cells and light a LED when the voltage for these cells is low. I guess that trip point to be around 2.1 to 2.4 Vdc. I have searched the internet and found voltage monitoring IC's etc. by Panasonic and ON Semiconductor, but none are readily available. These also have 3000 part min. qty. orders. I did manage to get some samples from ON Semi for a NCP301LSN22T1G voltage detector. They are microscopic and I will never be able to solder any thing to them! Can I use a comparator circuit? LM393? Any help would be appreciated!

29th August 2008, 02:49 PM	(permalink)
rainyday101	Thanks, I looked up the IC and like it, but it is microscopic in size! That is about the size of the ones I have from ON Semi. With it that small I wouldn't circuit board mount it and would need to solder wires to the legs. I don't have anything to solder that small and maybe the ability to do so. In my time away from this field I can't believe how small things have gotten! Any ideas appreciated. Thanks.

29th August 2008, 03:00 PM	(permalink)
KMoffett	Look for a MAX8211CPA: http://www.newark.com/68K5030/semico...questid=127695 Newark Electronics...in an 8-Pin DIP. Ken __________________ "To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931) Last edited by KMoffett; 29th August 2008 at 03:02 PM.

29th August 2008, 03:30 PM	(permalink)
rainyday101	Thanks!!!! That is exactly what I am looking for!!!