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under the overcharge detection voltage by the internal impedance, the T63H0008A release the overcharge 
                                                                     T63H0008A
TM Technology, Inc. reserves the right 
P. 11                                    
Publication Date: Dec. 2003 
to change products or specifications without notice.                                                                          Revision:A 
condition. 
Note:(1).
If the battery is charged to a voltage higher than the overcharge detection voltage (VDET1) and the battery voltage does 
not fall below the overcharge detection voltage (VDET1) even when a heavy load is connected, the detection of 
over-current 1 , over-current 2 and load short-circuiting does not work .Since an actual battery has the internal 
impedance of several dozens of mW, the battery voltage drops immediately after a heavy loadwhich causes 
over-current is connected, and the detection of over-current 1, over-current 2 and load short-circuiting then works..  
 (2).
When a charger is connected after the overcharge detection, the overcharge condition is not released even if the battery     
voltage is below the overcharge detection voltage VDET1. The overcharge condition is released when the V- pin 
voltage goes over the charger detection voltage VDET 5 by removing the charger. 
Over-discharge condition 
When the battery voltage falls below the over-discharge detection voltage (VDET2) during discharging 
under the normal condition and the detection continues for the over-discharge detection delay time 
(tVDET2) or longer, the T63H0008A turns the discharging control FET off to stop discharging. This 
condition is called the over-discharge condition. When the discharging control FET turns off, the V- pin 
voltage is pulled up by the RV-D resistor between V- and VDD in the IC. The voltage difference between 
V- and VDD then falls bellow 1.3V (typ.), the current consumption is reduced to the power-down current 
consumption (ISB). This condition is called the power-down condition.The power-down condition is 
released when a charger is connected and the voltage difference between V- and VDD becomes 1.3 V (typ.) 
or higher. Moreover when the battery voltage becomes the over-discharge detection voltage or higher, the 
T63H0008A turns the discharging FET on and returns to the normal condition. 
Charger detection 
When a battery in the over-discharge condition is connected to a charger and provided that the V- pin  
voltage is lower than the charger detection voltage (VDET5), the T63H0008A releases the over-discharge 
condition and turns the discharging control FET on as the battery voltage becomes equal to or higher than 
the over-discharge detection voltage (VDET2) since the charger detection function works. This action is 
called charger detection.  
When a battery in the over-discharge condition is connected to a charger and provided that the V- pin 
voltage is not lower than the charger detection voltage (VDET5), the T63H0008A releases the 
over-discharge condition when the battery voltage reaches the over-discharge detection voltage (VDET2) +  
over-discharge hysteresis (VHDT2 ) or higher. 
Abnormal charge current detection 
If the V- pin voltage falls below the charger detection voltage (VDET5) during charging under normal 
condition and it continues for the overcharge detection delay time (tVDET1) or longer, the charging control 
FET turns off and charging stops. This action is called the abnormal charge current detection. Abnormal 
charge current detection works when the DOUT pin voltage is “H” and the V- pin voltage falls below the 
charger detection voltage (VDET5). Consequently, if an abnormal charge current flows to an 
over-discharged battery, the T63H0008A turns the charging control FET off and stops charging after the 
battery voltage becomes higher than the over-discharge detection voltage which make the DOUT pin