Microcomputer having test circuit for A/D converter

Details Microcomputer having test circuit for A/D converter Microcomputer having test circuit for A/D converter

1993-07-15

1995-02-14

Williams, Howard L.

Coded data generation or conversion

Converter calibration or testing

341141, 341155, 341172, H03M 110

Patent

active

053899261

ABSTRACT:
Disclosed herein is a microcomputer having a test circuit for an A/D converter of a C/R type. This converter includes a resistor circuit having a plurality of resistors connected in series between reference potential points to generate a changeable reference voltage and a capacitor circuit having a plurality of capacitors for storing electrical charges relative to an analog input voltage and to the changeable reference voltage, and the test circuit is coupled to the resistor circuit and the capacitor circuit and further to first and second terminals and activated in a test mode to transfer the changeable reference voltage to the first terminal and another reference voltage, which is produced outside the microcomputer, to the capacitor circuit.

REFERENCES:
patent: 4517549 (1985-05-01), Tsukakoshi
patent: 4599604 (1986-07-01), McKenzie et al.
patent: 4611195 (1986-09-01), Shosaku
patent: 4908620 (1990-03-01), Fujisawa et al.
patent: 5016014 (1991-05-01), Bitting
patent: 5175547 (1992-12-01), Lyon et al.
patent: 5185607 (1992-12-01), Lyon et al.

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