2010/3/1 Marcelo Rodrigues > > 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 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist