Specifications

Wireless CPU
®
Q24 Series
Interfaces
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WM_PGM_Q24NG_PTS_001-005 November 20, 2007
3.14
3.14
Battery Charging Interface
.1 Hardware Description
Caution:
The battery int o owcharging erface does n t all
the Wireless CP plied and is
only used to charge a battery connected to VBATT.
Battery cha ugh switching transistor connecting the VBATT
signal to the Charger (CHG_IN signal).
The switching transistor is controlled by
algorithms.
hree types of battery technologies:
The algorithm controls the frequency and the connected time of switching transistor
During the charging procedure, battery charging level is controlled.
U
®
to be sup
rging is p ed thro aerform
the operating system with two kinds of
Equivalent circuit
The Wireless CPU
®
Q24 Series supports t
• Ni-Cd (Nickel-Cadmium), which is charged with the algorithm 0
• Ni-Mh (Nickel-Métal Hydrure), which is charged with the algorithm 0
• Li-Ion (Lithium-Ion), which is charged with the algorithm 1
(T).
To select the algorithm:
• AT+WBCM=4,0# Ni-Cd/Ni-Mh (by default)
• AT+WBCM=4,1#Li-Ion
• AT+WBCM=4,2#To know which algorithm is used
BAT_TEMP
Q24 Series
CHG_IN
Charger contro r lle
5K6
T
Cha
detection
rger
VBATT