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TUSB3410 数据表(PDF) 90 Page - Texas Instruments |
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TUSB3410 数据表(HTML) 90 Page - Texas Instruments |
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90 / 92 page  13–2 TUSB3410 SUSPEND D1 VREGEN RESET R2 32 k Ω C1 1 µF 3.3 V R1 15 k Ω Figure 13–2. External Circuit 13.3 Wakeup Timing From WAKEUP or RI Pin The TUSB3410 can be brought out of the suspended state, or woken up, by a command from the host. The TUSB3410 also supports remote wakeup and can be awakened by either of two input signals. A low pulse on the WAKEUP pin or a low-to-high transition on the RI pin wakes the device up. Note that for reliable operation, either condition must persist for approximately 3 ms minimum. This allows time for the crystal to power up since in the suspend mode the crystal interface is powered down. The state of the WAKEUP or RI pin is then sampled by the clock to verify there was a valid wakeup event. |
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