Apparatus for detecting open circuit in hard disk drive

Details Apparatus for detecting open circuit in hard disk drive Apparatus for detecting open circuit in hard disk drive

1996-10-02

1998-03-17

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340652, 360 46, 360 68, G08B 2100

Patent

active

057292086

ABSTRACT:
The open condition detection circuit (10) detects breakage in an external write magnetic coil (16, 18) in a hard disk drive. The magnetic coil (16, 18) receives write head signals H.sub.X and H.sub.Y generated by a write driver (12, 14) in response to write data D.sub.X and D.sub.Y. The circuit (10) includes a comparator (26, 28) coupled to the write driver (12, 14) for comparing both the write head signals H.sub.X and H.sub.Y with a predetermined reference voltage level and generating first and second differential comparison output signals. A first latch (40, 150) is coupled to the comparator (26, 28) and uses the write data D.sub.X and D.sub.Y as clock signals for latching the first differential comparison output signal just prior to a predetermined polarity change in the write head signal H.sub.X. A second latch (42, 154) is also coupled to the comparator (26, 28) and is clocked by the write data D.sub.X and D.sub.Y for latching the second differential comparison output signal just prior to a predetermined polarity change in the write head signal H.sub.Y. A multiplexer (44) coupled to the first and second latches alternatively selects an output from one of the first and second latches in response to the write data D.sub.X and D.sub.Y. The multiplexer (44) generates an output indicative of an open circuit condition in the external write magnetic coil (16, 18).

REFERENCES:
patent: 4940969 (1990-07-01), Taylor
patent: 5434717 (1995-07-01), Yoshinaga et al.

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