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ST3S01PHD-TR датащи(PDF) 5 Page - STMicroelectronics |
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ST3S01PHD-TR датащи(HTML) 5 Page - STMicroelectronics |
5 / 17 page ST3S01PHD 5/17 battery is fully charged the current into the battery has not to be more than C/25 (Nimh battery). In order to perform finely this, the CMD-PWM pin must be driven with PWM function (in the same time, the CMD-MODE must be kept low). The duty cycle allows to adjust the mean current needed. CHARGE MODE TheCMD-MODE pin, whenhigh(and CMD-PWM low), handles the switch in charge mode. This switch allows the battery charge with a strong current. The drop of this internal P-Channel MOS is very low (200mV @ 800mA) in order to optimize the efficiency of the charge. The switch is not internally protected against short circuit or overcurrent condition. When the switch is ON (CMD-MODE high and CMD-PWM low), the current direction into the chip is from VCHARGE to VBATT. The reverse current when the switch is ON must be null; this is obtained by mean of an internal circuitry that switch OFF the internal P-MOS when the VBATT is higher than VCHARGE, whatever the status of the CMD-MODE. When the CMD-MODE pin is low or in high impedance the switch is OFF, while it is ON when the signal on that pin is high. REVERSE MODE When the reverse function is selected by CDM-REVERSE pin, the switch allows to supply the accessories with a strong current. The drop of the internal P-Channel MOS is very low (200mV @ 800mA) and the switch properly work for VBATT higher than 2.5V. This allows to supply energy on the VCHARGE pin. When the switch is ON (CMD-REVERSE high) the current direction into thechipis from VBATT to VCHARGE. The reverse current (from VCHARGE to VBATT) when the switch is ON must be null; this is obtained by mean of an internal circuitry that switch OFF the internal P-MOS when the VCHARGE is higher than VBATT, whatever the status of the CMD-REVERSE. When the level of CMD-REVERSE pin is low or in high impedance, the switch is OFF, while it is ON when the signal on CMD-REVERSE pin is high. OVERVOLTAGE PROTECTION This function allows to held the switches OFF when the voltage level on VBATT is higher than a maximum voltage whatever are the values of CMD-PWM, CMD-MODE and CMD-REVERSE. This maximum voltage is shown in the electrical characteristic (typical threshold 5.7V). From the moment in which the o.v.protection is activated, it will be possible to turn ON again the switch only when the VCHARGE value decreases down to 2.5V typically, it doesn't matter which operation mode is selected. The protection works only when the battery is in charge or precharge mode, i.e. VCHARGE >VBATT. This represents, in fact, the typical application condition where the battery could increase its value, i.e. When charge or precharge mode are used. CHARGER DETECTION MODE This function allows to generate a digital signal (CHARGER-OK) to indicate if the VCHARGE voltage is higher than 2.5V and the reverse function is inactive. This functionality allows to determine if the charger is present or not; if the VCHARGE is lower than the 2.5V, the CHARGER-OK goes into high impedance (open drain). When the reverse function is active, this open drain have the VCHARGE-VBATT information. This circuitry is directly supplied from VCHARGE pin and works only for VCHARGE higher than 2.2V. VCHARGE-VBATT DETECTION MODE This function allows to generate a digital signal (VCHARGE-VBATT)flagtoindicateif the VCHARGE voltage is higher than VBATT;if the VCHARGE is lower than the VBATT, this open drain goes into high impedance state. This circuitry is directly supplied from VCHARGE pin and works only for VCHARGE higher than 2.2V. THERMAL PROTECTION An internal thermal shutdown circuitry will switch OFF the P_MOS, only in precharge or in charge mode, when the junction temperature reaches typically 180°C. This has been implemented in order to protect the device from overburning. 20°C of thermal hysteresis will avoid a thermal oscillation. This circuitry is supplied from VCHARGE and, so, acts only on the precharge and charge switches. ESD PROTECTION Both VCHARGE and VBATT pins are protected against electrostatic discharge up to ±4KV (HBM, MIL STD 833D. CHARGE VOLTAGE VCHARGE functional operating range is from 2.5V to 12V.AtVCHARGE=14V typically the I.C. is automatically turned OFF and remains OFF up to 16V. A VCHARGE voltage higher than 16V can damage the IC. |
Аналогичный номер детали - ST3S01PHD-TR |
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Аналогичное описание - ST3S01PHD-TR |
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