Wavecom G2 Especificações descarregar pdf (Página 47)

Wireless CPU

Q24 Series

Interfaces

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prior written agreement.

WM_PRJ_Q24NG_PTS_001-004

January 16, 2007

3.14 Battery Charging Interface

3.14.1 Hardware Description

Caution:

The battery charging interface does not allow

the Wireless CPU

to be supplied and is

only used to charge a battery connected to VBATT.

Battery charging is performed through a switching transistor connecting the VBATT

signal to the Charger (CHG_IN signal).

The switching transistor is controlled by the operating system with two kinds of

algorithms.

Equivalent circuit

The Wireless CPU

Q24 Series supports three types of battery technologies:

• 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

The algorithm controls the frequency and the connected time of switching transistor

(T).

To select the algorithm:

• AT+WBCM=4,0Æ Ni-Cd/Ni-Mh (by default)

• AT+WBCM=4,1ÆLi-Ion

• AT+WBCM=4,2ÆTo know which algorithm is used

During the charging procedure, battery charging level is controlled.

BAT_TEMP

Q24 Series

CHG_IN

Charger controller

5K6

Charger

detection

VBATT

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