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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
Module).algorithm 1
The two algorithms control a switch, which connects the CHG-IN signal to the
VBATT signal. The algorithm controls the frequency and the connected time of
the switching. During the charging procedure, battery charging level is
monitored and when Li-Ion algorithm is used, battery temperature is monitored
via the ADC1/BAT-TEMP input.
One more charging procedure is provided by the Q2686 Wireless CPU
called "Pre-charging" mode, but is a special charging mode because it is
activated only when the Wireless CPU
performed by the 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.
© Confidential
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without prior
written agreement.
WM_PRJ_Q2686_PTS_001-010
®
supports one battery charging circuit, two
(Nickel-Cadmium) with algorithm 0
(Lithium-Ion) with the embedded PCM (Protection Circuit
BattLevelMax
T2
T1
Figure 7: Ni-Cd / Ni-Mh charging waveform
T1
T2
T3
®
is OFF. Control is in this case
Min
Typ
1
0.1
5
Q2686 Wireless CPU
®
. This is
only
T3
Max
Unit
s
s
s
Page: 53 / 97
June 30, 2009
®
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