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Low Cost Eight Bit Sequencer

IP.com Disclosure Number: IPCOM000119967D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Palmucci, CJ: AUTHOR [+3]

Abstract

This article describes a low-cost eight-bit sequencer to check the output voltage adjustability feature of a digital-to analog converter (DAC)-adjusted power supply. The drawing shows the block diagram of the eight-bit sequencer and the power supply interaction.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 62% of the total text.

Low Cost Eight Bit Sequencer

      This article describes a low-cost eight-bit sequencer to
check the output voltage adjustability feature of a digital-to analog
converter (DAC)-adjusted power supply. The drawing shows the block
diagram of the eight-bit sequencer and the power supply interaction.

      The main element of the eight-bit sequencer is the oscillator.
The oscillator drives multiple divide-by-2 counters to generate
eight- bit binary data.  This data drives a parity generator whose
output is used by the power supply to test the data integrity.  The
one-bit parity, eight-bit data signals and load enable signal are
transmitted to the power supply under test through an interface
cable.  The enable signal causes the data to be loaded into the D/A
converter registers.  The enable signal generated in the sequencer is
delayed to allow time for the data and parity to change to a new
state.

      The power supply validates the data using the parity bit, and,
if the enable line is activated, the D/A converter changes the
regulation point of the power supply.  The voltage output of the
regulator is sensed by a digital multimeter that measures the voltage
change between two different D/A settings and transmits the reading
to a printer for hard copy output.  The relative measurement is
externally triggered by the sequencer using two signals per data
change.  The first signal measures the final voltage after a data
change and compares it to a previously st...