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This article describes a circuit allowing control by means of an 8-bit processor of 31 DC/DC blowers and the rotation of which is fully asynchronous with the processor clock.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
53% of the total text.
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Multiport Asynchronous Events Digital Monitoring System
This article describes a circuit allowing control by means of an 8-bit
processor of 31 DC/DC blowers and the rotation of which is fully asynchronous
with the processor clock.
Fig. 1 shows the general architecture of the circuit allowing the control of the
31 blowers by a microprocessor through a bus interface, a speed logic detection
circuit and a multiplexer MPX.
All the DC/DC blowers have their own speed relation; they are all
asynchronous with each others.
To detect their speed rotation, they are selected in sequence by multiplexer
MPX driven by a 5-bit counter such as shown in Fig. 2. Each blower is selected
during a dividing of the Main clock circuitry (four period maximum must be
included inside the time selection 'window').
As each blower is asynchronous with the main clock of the circuits, at the
beginning of each selector, a reset is used to assure that the concerned blower is
installed inside the right window and all the circuits set at a good defined level
(this reset is done by the help of 3 bits of the counter A+B+C).
Then, the circuit is ready to analyze the period of the output blower. After the
reset: 1. The first positive front of the selected blower sets a counter (%N). When
this counter (%N) has reached a defined status, a signal clocks the level of the
selected signal and resets the counter (%N): - if the latched level is high, the
period of the blower signal is wider than expected so a positive front is sent to the
clocking of the memory which loads the counter status (1 word of...