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    • 3. 发明授权
    • Direct-measurement provision of safe backdrive levels
    • 直接测量提供安全的反向驱动电平
    • US6114848A
    • 2000-09-05
    • US231001
    • 1999-01-14
    • Anthony J. SutoRobert J. MullerJohn D. Moniz
    • Anthony J. SutoRobert J. MullerJohn D. Moniz
    • G01R31/28G01R31/319
    • G01R31/2806G01R31/31924
    • Pin-driver circuitry in each of an automatic circuit tester (10)'s digital driver/sensor circuits (36) includes a current sensor (R.sub.sense, QS1, QS2, D1, and D2) and comparison circuit (58) that indicate whether the load current supplied by the driver exceeds a level set by a threshold input (CURRENT.sub.-- VALUE). The pin-driver circuitry also includes a timer (60) whose output indicates whether the comparison circuit's output has been asserted for a length of time that exceeds a limit set by a duration input (TIME.sub.-- -VALUE). When it has, the tester disables the driver and thereby prevents damage that could otherwise result from excessive backdrive durations that the test-generation process did not anticipate.
    • 自动电路测试器(10)的数字驱动器/传感器电路(36)中的引脚驱动器电路包括电流传感器(Rsense,QS1,QS2,D1和D2)和比较电路(58),其指示是否 由驾驶员提供的负载电流超过阈值输入设定的电平(CURRENT-VALUE)。 引脚驱动器电路还包括定时器(60),其输出指示比较电路的输出是否已被断言超过由持续时间输入(TIME-VALUE)设置的限制的时间长度。 当它有,测试仪禁用驱动程序,从而防止由于测试生成过程没有预料到的过度反向驱动持续时间造成的损坏。