(12) United States Patent Young US007984226B2 US 7,984,226 B2 Jul. 19, 2011 (10) Patent N0.: (45) Date of Patent: (54) (75) (73) (21) (22) (65) (51) (
US 7,984,226 B2 7 USB signals, and later generates a second set of ?rst input signals to pass the USB data signals from the ?rst set of USB signals or
US. Patent Jul. 19, 2011 Sheet 1 015 US 7,984,226 B2 KT / 16\ 22 FIG. 1 / ®@ @6 § 14
US. Patent Jul. 19, 2011 Sheet 3 015 US 7,984,226 B2 VBUSEXT (Q 82 24 VBUS -USBEXT <%% DM DP +USBEXT < (83:31am SHIELD > DTRx VCCOUT < >
US. Patent Jul. 19, 2011 Sheet 5 015 US 7,984,226 B2 140 4H 152 | l 142 | I I I 144 I | I —A— 1 | —// I 'l kvth —|—>- l 154 | | | I T0 T1
US 7,984,226 B2 1 METHOD FOR SENSING AND AUTO SWITCHING BETWEEN TWO USB INPUT PORTS TO A SINGLE PORT ON THE PDA FIELD OF THE INVENTION The present inv
US 7,984,226 B2 3 the docking cradle passes With any data present at the Ether net jack 20 to and from the MDT 10. The docking cradle 12 connects USB
US 7,984,226 B2 INl 1N2 COM to NO and NO to COM COM isolated from N00, N01, and N02 COM = NOl COM = NOO COM = NO2 Thus, the COM terminal and the signa
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