Hi, arocholl,

I'm using the LIR2032 battery (Nominal C = 35mAh and standard charging
method = CC 17mA (0.5C)). Thus the PROG resistor i'm using is 60K4 (aprox.
16mA).

I can't just plug a battery and check the current value. It will be tested
in the production
and must be a fast method. The people that will make it, must just verify if
threre is a known current value. As the current depends on the battery
voltage, i can't use it.



arocholl wrote:
> 
> 2010/3/1 Marcelo Rodrigues <msrmail@gmail.com>
> 
>>
>> 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).
>>
> 
> The 0.1C step is needed only for deeply discharged battery, you shouldn't
> get into that step with a Lipo in normal situations. In any case, this
> step
> takes almost no time.
> 
> For the 1C step, It will charge to whatever current you program it to with
> the external PROG resistor, limited to the max MCP device charge current.
> 
> 
>>
>> I have measured the charge time several times and it takes about 5 hours
>> until the MCP73831 signals that the battery is fully charged.
>>
> 
> Perhaps hat is because you selected a wrong PROG resistor. What is the mAh
> capacity of your battery and what is the PROG resistor you selected for
> the
> circuit?
> 
> 
>>
>> The MCP73831 doesns't have a timer to control the end of charge, only the
>> MCP73833.
>>
> 
> You're right. So how do you know then the battery gets fully charged? By
> led
> status indicator?
> 
> 
>>
>> 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.
>>
>>
> I don't think it can damage the IC based on internal circuit modular
> diagram. However, it may quickly shutdown charge as I guess it will get
> nominal voltage immediately. Why you don't just plug a Lipo battery and
> check whatever you need to check?
> 
> 
> 
> -- 
> Ariel Rocholl
> Madrid, Spain
> -- 
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> 

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