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ST3S01PHD-TR Scheda tecnica(PDF) 4 Page - STMicroelectronics |
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ST3S01PHD-TR Scheda tecnica(HTML) 4 Page - STMicroelectronics |
4 / 17 page ST3S01PHD 4/17 I.C. BLOCK DIAGRAM POSSIBLE OPERATING MODES Five different operating modes are allowed: charge, precharge, reverse, charge+reverse and precharge+reverse. These operating modes can be achieved by properly selection of the CMD-REVERSE CMD-PWM and CMD-MODE (See POSSIBLE OPERATING MODE Table). PRECHARGE MODE The PRECHARGE function is composed by a switch and a 100mA current source which fully works for VCHARGE higher than 2.5V. When the CMD-MODE and the CMD-PWM are not leaded the switch is ON, being the input states held by an internal pull down resistor. This is used when the battery is strongly discharged. In this case VBATT can be null (battery empty) and all the input pins are not held by any level (because the micro-controller is down), except the VCHARGE pin which is a main supply. The source of current supplies a constant current into the battery till its voltage level reaches the required level allowing to start the micro-controller (typically 3V). The current direction is from VCHARGE to VBATT.The reverse leakage current when the switch is ON must be null; this is obtained thanks to an internal circuitry that switch OFF the internal P-MOS when the VBATT is higher than VCHARGE,whatever the status of the CMD-MODE. The precharge function is also used to adjust the mean current. When the |
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