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T63H0001A-BX Datasheet(PDF) 5 Page - Taiwan Memory Technology |
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T63H0001A-BX Datasheet(HTML) 5 Page - Taiwan Memory Technology |
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5 / 7 page  TE CH tm T63H0001A TM Technology Inc. reserves the right P. 5 Publication Date:MAR. 2004 to change products or specifications without notice. Revision:A which enables charge control Nch-MOS-FET for turning to “OFF”. Though the VDD voltage would be going up to a higher level than Vdet1 if it is within a time period of the output delay time, VD1 would not be output a signal for turning “OFF” of charge control Nch-MOS-FET. A level shifter incorporated in a buffer driver for the Cout pin makes the “L” of Cout pin to the VM pin voltage and the “H” of Cout pin is set to VDD voltage with CMOS buffer. Reset conditions from overcharging There can be two cases to reset the VD1 making the Cout pin level to “H” again after detecting overcharge. Resetting the VD1 makes the charging system ready for resumption of charging process. The first case is in such condition that a time when the VDD voltage is coming down to a level lower than “Vdet1-Vhys1”. While in the second case, disconnecting a charger from the battery pack can make the VD1 resetting when the VDD level is within hysteresis width (Vdet1-Vhys1<=VDD<Vdet1) After detecting over-charge with the VDD voltage of higher than Vdet1, connecting system load to the battery pack makes load current allowable through parasitic diode of external charge control Nch-MOS-FET. The Cout level would be “H” when the VDD level is coming down to a level below the Vdet1 by continuous drawing of load current. VD2/Over-Discharge Detector The VD2 monitors a VDD pin voltage. When the VDD voltage crosses the over-discharge detector threshold Vdet2 from a high value to a value lower than the Vdet2, the VD2 can sense an over-discharging and the external discharge control Nch-MOS-FET turns to “OFF” with Dout pin being at “L”. Resetting the VD2 with the Dout pin level being “H” again after detecting over-discharge is only possible by connecting a charger to the battery pack. When the VDD voltage stays under over-discharge detector threshold Vdet2 charge current can flow through parasitic diode of external control Nch-MOS-FET, then after the VDD voltages comes up to a value larger than Vdet2 discharging process would be advanced through “ON” state discharge control Nch-MOS-FET. Connecting a charger to the battery pack makes the Dout level being “H” instantaneously when the VDD voltage is higher than Vdet2. An output delay time for the over-discharge detection is fixed internally. Through the VDD voltage would be going down to a lower level than Vdet2 if it is within a time period of the output delay time, VD2 would not output a signal for turning “OFF” of discharge control Nch-MOS-FET. After detection of an over-discharge by VD2, supply current would be reduced to 0.3uA TYP. At VDD=2V and into standby, only the charger detector is operating. The output type of Dout pin is CMOS having “H” level of VDD and “L” level of VSS. VD3/Excess Current Detector, Short Circuit Protector Both of the excess current detector and short circuit protector can work when both control |
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