Method by which to detect direction of current flow in outputs o

Details Method by which to detect direction of current flow in outputs o Method by which to detect direction of current flow in outputs o

1991-09-30

1993-03-30

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 731, 371 151, 340664, G01R 3128, G08B 300

Patent

active

051987600

ABSTRACT:
Test circuitry implemented in an integrated circuit having a plurality of outputs for testing the current at the outputs of output drivers of the integrated circuit without physical removal of the integrated circuit from an assembly in which it is incorporated. The test circuit includes a first test bus, a second test bus, and comparator circuitry responsive to the signals on the first and second test busses. Associated with each of the output drivers are (a) a current sensing resistor for sensing the current flow at the output of the buffer, (b) a first transmission gate connected between one side of the sensing resistor and the first test bus, and (c) a second transmission gate connected between the other side of the sensing resistor and the second test bus. The first and second transmission gates associated with an output buffer are controlled in parallel via a scan register. As to a selected output driver whose associated transmission gates are turned on, the comparison circuitry provides an indication as to whether the current flow sensed by a selected current sensing resistor is outside a predetermined range.

REFERENCES:
patent: 4366393 (1982-12-01), Kasuya
patent: 4720671 (1988-01-01), Tada et al.
patent: 4782283 (1988-11-01), Zasio
patent: 4961053 (1990-10-01), Krug
patent: 5059899 (1991-10-01), Farrworth et al.

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