| 摘要 |
A circuit ( 11 ) utilizing a serial advanced technology attachment (ATA) interface for transmitting connectivity signals from the serial ATA interface to a controller ( 10 ) in order for the controller to determine a status of connectivity of a hard drive disk (HDD) ( 21 ) to the serial ATA interface. The circuit includes an input end (A) connecting to a ground end of the serial ATA interface, and electronically connecting to a high voltage source; a positive-negative-positive (PNP) tripolar transistor (Q 1 ), a first negative-positive-negative (NPN) tripolar transistor (Q 2 ), a second NPN tripolar transistor (Q 3 ), and an output end connecting a collector of the second NPN tripolar transistor with the controller for outputting voltage signals to the controller. The controller is a programmable microprocessor for determining whether or not the HDD is connected to the serial ATA interface, based on the voltage signals input to the controller.
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