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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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FUSB308B датащи(PDF) 16 Page - ON Semiconductor |
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FUSB308B датащи(HTML) 16 Page - ON Semiconductor |
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16 / 53 page  FUSB308B www.onsemi.com 16 Discharge during a Connection The discharge functions can be manually activated via the PWRCTRL.FORCE_DISCH register. The discharge pull−down is specified by RFULL_DISCH. The FUSB308B will automatically disable discharge when VBUS reaches VBUS_STOP_DISC threshold. Figure 14. Source Discharge During a Connection PWRCTRL.FORCE_DISCH Apply RFORCE VBUS_STOP_DISC time VBUS tSrcSettle vSrcNew Watchdog Timer The watchdog timer functionality is enabled whenever TCPC_CTRL.EN_WATCHDOG is set to 1b. The watchdog timer should only be enabled after an attach when the device is in Attached.Src, Attached.Snk or Apply.ROLECONTROL states. The watchdog timer starts when any of the interrupts that are not masked in the Alert register are set or when the INTB pin is asserted. The watchdog timer is cleared on an I2C access by the TCPM (either read or write). If the INTB pin is still asserted after this I2C access, the watchdog timer will reinitialize and start monitoring again until all of the Alerts are cleared or until the INTB pin is de−asserted. When the watchdog timer expires, the FUSB308B will immediately disconnect the CC terminations by setting ROLE_CONTROL bits 3..0 to 1111b, disable all SRC/SRC_HV or SNK outputs, discharge VBUS to vSafe0V, and set FAULT_STATUS.I2CInterfaceError. |
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