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2-4. Charging Circuit
Figure 2-7 shows the charging circuit block diagram. (1) Operation of the system controller IC801 during charging When the DC plug is connected to the DC jack, the supplied voltage is supplied to the system controller pin%¶ [DCINMNT] of IC801 and PIN#¢ [DCIN] of POWER CONTROL IC401 via D415. Each IC detects that AC adapter is connected. After the system controller IC801 starts up and recognizes that AC adapter is connected, the system controller IC801 detects the rechargeable battery by the input terminal of pin^¡ [CHGMHT2] as described below. When the system controller IC801 recognizes that a voltage is input to pin^¡ [CHGMNT2], an "H" signal is output from pin!¡ [CHGON]. POWER CONTROL IC401 starts the charging operation by this "H" signal. = Rechargeable Battery Detection = The system controller IC801 performs the battery detection by pin^¡ [CHGMNT2]. When the rechargeable battery is inserted (see Fig. 2-8(a)), a voltage is input to pin^¡ [CHGMNT2] because cathode of the supplied rechargeable battery is exposed. When an alkaline dry cell battery (size AA) is inserted (see Fig.2-8(b)), voltage is not input to pin^¡ [CHGMNT2] because cathode of the battery is molded. In the system controller IC801, if no voltage is input to pin^¡ [CHGMNT2] , an "L" signal is output from pin!¡ [CHGON] and the charging operation stops. When batteries are inserted as shown in Fig. 2-8(c), voltage is input to pin^¡ [CHGMNT2] of the system controller IC801. An "L" signal is output from pin!¡ [CHGON] because the system controller IC801 detects that the voltage rise time is fast (Generally, primary cell has a characteristic that the voltage rise time is faster than secondary cell.) and identifies that the inserted battery is not a rechargeable battery, and an "L" signal is output from pin!¡ [CHGON]. Hence, the charging operation stops.
Rechargeable battery detection terminal
Rechargeable battery detection terminal
Rechargeable battery detection terminal
(Voltage is output because the minus side of the rechargeable battery is not molded.)
(Voltage is not output because the minus side of the battery is molded.)
( Voltage is output because the minus side of the rechargeable battery is not molded.)
TO IC801 61pin CHGMNT2
TO IC801 61pin CHGMNT2
TO IC801 61pin CHGMNT2 (Detects that the inserted battery is not rechargeable battery because the voltage rise time is fast.)
(a)When rechargeable battery is inserted
(b)When alkaline battery is inserted
(c)Example of inserting rechargeable battery and alkaline battery
Fig. 2-8 How to detect the rechargeable battery
� 15 �
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