Microprocessor support integrated circuit

Details Microprocessor support integrated circuit Microprocessor support integrated circuit

1987-01-02

1988-12-20

Shaw, Gareth D.

Boots, shoes, and leggings

323317, 363 17, 363 63, 307359, G05F 320, G10L 500, G04B 100

Patent

active

047928999

ABSTRACT:
A single chip integrated circuit is partitioned to support a microprocessor chip for providing the logic interface between a keyboard peripherally connected to a host computer. The support circuit includes in a single integrated chip a voltage regulator, a serial to parallel converter, a multiple output current source, an oscillator, a DC to DC converter, an audio driver and LED drivers. The voltage regulator produces a plurality of regulated output voltages utilized to operate the microprocessor and the internal circuitry of the support circuit and is comprised of a band gap regulator and output of which is coupled to an external resistor for providing a reference current. The current source is coupled to the voltage regulator and provides a plurality of output currents ratioed with respect to the reference current. The serial to parallel converter converts serial digital data supplied from the microprocessor into parallel data for controlling the operation of the audio and LED driver circuits. The LED driver circuit converts currents supplied thereto from the current source to a higher magnitude sufficient for driving individual LEDs. The audio driver circuit provides a logarithmic output current thereat as controlled by said data.

REFERENCES:
patent: 4206397 (1980-06-01), Dahlke
patent: 4441825 (1984-04-01), Morokawa
patent: 4584517 (1986-04-01), Schwob
patent: 4627093 (1986-12-01), Hashimoto et al.
patent: 4635211 (1987-01-01), Yoshida et al.
patent: 4638451 (1987-01-01), Hester et al.
patent: 4685040 (1987-08-01), Steigerwald et al.
patent: 4692641 (1987-09-01), Highton
patent: 4698737 (1987-10-01), Miller et al.
patent: 4717839 (1988-01-01), Miller
patent: 4733163 (1988-03-01), Miller

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