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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STC3117 датащи(PDF) 19 Page - STMicroelectronics |
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STC3117 датащи(HTML) 19 Page - STMicroelectronics |
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19 / 34 page  DocID025792 Rev 2 19/34 STC3117 Functional description 34 Figure 9. Timing diagram details of the power-up and restart sequence Battery swap detection A battery swap can be detected in two ways: • the battery voltage drops below the undervoltage lockout (UVLO) for more than tdel • the BATD signal rises above the BATD threshold (1.61 V typ) for more than tdel The tdel delay is 0.5 s. Using the 0.5 s filter provides robust battery swap detection and prevents false battery swap detection if short contact bouncing occurs at the battery terminals due to mechanical vibrations or shocks. This also prevents false detections in case of short battery voltage drops and protects the application against high surge currents at low temperatures. Following a battery swap detection and after the battery voltage goes back above UVLO and the BATD level returns to low level, the STC3117 is on hold with new voltage and current measurements in the corresponding registers. The system has to restart the STC3117 by doing a device soft reset i.e. by setting the PORDET bit to 1 in the REG_CTRL register and restoring the parameters (if needed). To recover the event, either use the measured voltage and current to define a new OCV voltage, or restore a previous SOC state. The occurrence of the battery swap event is indicated by the BATFAIL and UVLOD bits in the REG_CTRL register. VCC UVLO Internal 1mA sink current Voltage measurement delay CD pin (low means HiZ) OCV meas. Application can start, charge is enabled Current measurement Temperature measurement 125 ms Conversion counter X 0 1 23 Vinmin_cd Ibat meas. (arbitrary Vcc waveforms only to illustrate the function) “Dead” battery “Good” battery GAMS1601141520CB “Good” battery “Dead” battery 375 ms 125 ms 125 ms 250 ms 100 ms |
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