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WM_PRJ_Q2686_PTS_001-010
June 30, 2009
Q2686 Wireless CPU
®
3.13.2
Li-Ion Charging Algorithm
The Li-Ion algorithm provides battery temperature monitoring, which is highly
recommended to prevent battery damage during the charging phase.
The Li-Ion charger algorithm can be broken down into three phases:
1.
Constant charge
2.
Beginning of pulse charge
3.
End of pulse charge
The three phases can be seen on the following waveform for full charging:
Figure 8: Li-Ion full charging waveform
Electrical characteristics of Li-Ion battery timing charge
Parameter
Min
Typ
Max
Unit
Step 1 switching
Closed
Always
s
Open
0.1
s
Step 2 switching
Closed
1
s
Open 0.1
3 s
Step 3 switching
Closed
1
s
