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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STPM066S датащи(PDF) 17 Page - STMicroelectronics |
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STPM066S датащи(HTML) 17 Page - STMicroelectronics |
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17 / 67 page  • The device can be moved to STANDBY mode, applying a voltage below VWAKE_OFF threshold, with a minimum pulse width of tWAKE_FILTER. 4.2.7 Synchronizing pin (SYNC in/out) The user can provide an external clock on SYNCIN pin (higher than 1.8 MHz) in order to change the switching frequency of the internal regulators (Buck and Boost). In case an external clock is not provided, SYNCIN can be left floating (with inner pull-down resistor). All regulators work at their default switching frequency or, for the Buck, the frequency selected by OTP. When a clock at fsyncin frequency is provided on SYNCIN pin: • Boost works at fsyncin if fsyncin>1.8 MHz or 2.4 MHz (default switching frequency) if fsyncin<1.2 MHz. • When the frequency of the Buck is set to 2.4 MHz by OTP, the Buck works at fsyncin if fsyncin>1.8 MHz or 2.4 MHz (default switching frequency) if fsyncin<1.2 MHz. • When frequency of the Buck is set to 400 kHz by OTP, the Buck works at fsyncin/6 if fsyncin>1.8 MHz or 400 kHz (default switching frequency) if fsyncin<1.2 MHz. Figure 4. SYNC IN/OUT in Active mode IC Frequency processors Frequency detection 2.4 MHz in PLL out Oscillator Clock for buck & boost Control logic Smitter SYNCIN pin SYNCOUT pin MUX SYNCIN/OUT function in ACTIVE mode Buffer 0 1 + - Reference frequency GADG1105180837PS STPM066S Voltage regulators and features description DS12976 - Rev 2 page 17/67 |
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