Specifications

Wireless CPU
®
Q24 Series
Interfaces
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WM_PRJ_Q24NG_PTS_001-004
January 16, 2007
3.14.3 Ni-Cd / Ni-Mh Charging Algorithm
During the charging process of a Ni-Cd and Ni-Mh battery, it is required to tune
software parameters in the Wireless CPU
®
operating system:
AT+WBCM=<Mode>, <ChargeInd>, <BattLevelMax>, <BattLevelMin>,
<TPulseInCharge>, <TPulseOutCharge>, <BattIntRes>, <BattChangeLevel > (See the
AT command Interface Guide
[4]).
Caution:
The parameters need to be tuned according to the battery specifications.
The main parameters to be tuned are:
Parameters related to time:
• TPulseInCharge: Monitoring time of the VBATT voltage during a charging
process (T2)
• TPulseOutCharge: Monitoring time of the VBATT voltage when charging
process is not activated(T3)
Parameters related to voltage:
• BattLevelMin: Minimum VBATT voltage allowed by the battery (>3.2V)
• BattLevelMax: Maximum VBATT voltage allowed by the battery (<4.5V)
Ni-Cd / Ni-Mh battery and tunable parameter
Parameter Default value Min Max Unit
T1 1000 (Not tunable) ms
T2 100 100 10000 ms
T3 5000 100 10000 ms
BattLevelMin 3400 3400 3800 mV
BattLevelMax 4200 4000 5000 mV