Specifications

Wireless CPU
®
Q24 Series
Interfaces
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prior written agreement.
WM_PRJ_Q24NG_PTS_001-004
January 16, 2007
3.14.4 Li-Ion Charging Algorithm
During the charging process of a Li-Ion battery, it is required to tune parameters
embedded in the Wireless CPU
®
operating system:
AT+WBCM=<Mode>,<ChargeInd>,<TdeltaTemp>,<BattLevelMax>,
<BattLevelMin>, <MaxVoltPulse>,
<MaxBatteryTemp>,<MinBatteryTemp>,<Charging_Current>, <DedicatedVoltStart>,
<Battery_Pulse_Charging_Timeout>, <Battery_Fast_Charging_Timeout>,
<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:
• BatteryFastChargingTimeout: Maximum duration of the fast charging period.
(T1)
• BatteryPulseChargingTimeout: Maximum duration of the charging pulse
period.(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)
• DedicatedVoltStart: Pulse charging is started above this threshold voltage
Parameter related to charging current:
• ChargingCurrent: Charging current delivered by the charger
Parameters related to safety:
These parameters are important; as they ensure that the battery will not be damaged.
• MaxVoltPulse: Maximum VBATT over-voltage supported by the PCM of the
battery (Protection Circuit Module)
• TdeltaTemp: Delta time interval to measure the variation of the battery
temperature
• Min_Battery_Temp_Volt: Lowest value for battery temperature sensor voltage
in mV (highest temperature with a NTC
• Max_Battery_Temp_Volt: Highest value for battery temperature sensor
voltage in mV (lowest temperature with a NTC)