Q2686

Manufacturer Part NumberQ2686
DescriptionWireless CPU
ManufacturerWavecom
Q2686 datasheet
 


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3.13
Battery Charging Interface
The Q2686 Wireless CPU
algorithms and one hardware charging mode (pre-charging) for 3 battery
technologies:
Ni-Cd
Ni-Mh (Nickel-Métal Hydrure) with algorithm 0
Li-Ion
The two algorithms control a switch, which connects the CHG-IN signal to the
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VBATT signal. The algorithm controls the frequency and the connected time of
the switching. During the charging procedure, battery charging level is
controlled and when the Li-Ion algorithm is used, battery temperature is
monitored via the BAT-TEMP ADC input.
One more charging procedure is provided by the Q2686 Wireless CPU
called “Pre-charging” mode, but is a special charging mode as it is activated
only when the Wireless CPU
hardware. The purpose of this charging mode is to avoid battery damage by
preventing the battery from being discharged to below the minimum battery
level.
3.13.1 Ni-Cd / Ni-Mh Charging Algorithm
To charge the battery, the algorithm measures battery level when the switch is
open (T2) and charges the battery by closing the switch (T3). When the battery
is charged (battery voltage has reached BattLevelMax) the switch is open for
time T3.
Battery Level
closed
Switch State
opened
Electrical characteristics of Ni-Cd / Ni-Mh battery timing charge
Parameter
Note: T1,T2,T3 and BattLevelMax may be configured by AT command.
The battery level is monitored by the software (but not temperature)
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PRJ_Q2686_PTS_001-007
®
supports one battery charging circuit, two
(Nickel-Cadmium) with algorithm 0
(Lithium-Ion) with algorithm 1
®
is OFF. Control is thus only performed by the
BattLevelMax
T2
T1
Figure 5: Ni-Cd / Ni-Mh charging waveform
Min
T1
T2
T3
confidential ©
Q2686 Wireless CPU
Interfaces
®
. This is
T3
Typ
Max
Unit
1
s
0.1
s
5
s
Page: 48 / 87
March 6, 2007
®