Hi, arocholl

The MCP73831 charges with 0,1C until the battery reaches 66.7% of the
nominal voltage, then it charge with 1C (CC) until the nominal voltage. The
last step is to charge with
the nominal voltage (CV).

I have measured the charge time several times and it takes about 5 hours
until the MCP73831 signals that the battery is fully charged.

The MCP73831 doesns't have a timer to control the end of charge, only the
MCP73833.

About my question, i want to use the resistor only to verify if the tracks
around the IC are not open or shorted. Actually i don't need to simulate all
CV/CC charging steps. But i'm worried if the resistor can damge the IC.


arocholl wrote:
> 
> If you understand the logic behind CV/CC charging steps, you can see how
> bad
> a single resistor will work simulating a Lipo battery. Internal logic of
> the
> MCP73831 will not work properly with a single resistor.
> 
> Why do you need to wait 5hs? it is because of the autoshutdown timer? At a
> specified 1C charging rate, a battery should be charged in 1hr or less,
> and
> that assuming it was fully depleted. You will measure different charging
> currents at different times on the charging curve, but you can start
> measuring it as soon as you feed some power to the circuit.
> 
> To test the autoshutdown timer you have to wait till timer expires, MCP
> doesn't offer any simpler method.
> 
> 2010/2/27 Marcelo Rodrigues <msrmail@gmail.com>
> 
>> Hi all,
>>
>> I'm designing a product using the MCP73831 Battery Charger. I need to
>> check
>> if the MCP73831 is working properly, but i can't wait it to make a
>> complete
>> battery charge, because it takes about 5 hours.
>>
>> Thus i've decided to connect a single resistor (4K) at the VBAT pin
>> without
>> the battery and verify if the current at this pin have the expected value
>> (1mA).
>>
>> My question is: Connecting a resistor at the VBAT pin can damage the
>> MCP73831?
>>
>> Or maybe do you know another better and simple way to test this IC?
>>
>> Thanks in advance.
>>
>> --
>> Marcelo dos Santos Rodrigues
>> --
>> http://www.piclist.com PIC/SX FAQ & list archive
>> View/change your membership options at
>> http://mailman.mit.edu/mailman/listinfo/piclist
>>
> 
> 
> 
> -- 
> Ariel Rocholl
> Madrid, Spain
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> 
> 

-- 
View this message in context: http://old.nabble.com/MCP73831-Battery-Charger-tp27728730p27745652.html
Sent from the PIC - [EE] mailing list archive at Nabble.com.

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist