Semiconductor integrated circuit device and disk drive apparatus

Details Semiconductor integrated circuit device and disk drive apparatus Semiconductor integrated circuit device and disk drive apparatus

1999-03-02

2000-07-11

Masih, Karen

Electricity: motive power systems

Open-loop stepping motor control systems

318560, 318561, 318565, 318434, 388909, 388934, 395109, H02P 800

Patent

active

060877987

ABSTRACT:
A semiconductor integrated circuit device for use in a disk drive apparatus has a stepping motor driver for feeding an electric current to a stepping motor, a temperature monitoring circuit for monitoring the temperature due to the heat generated by the stepping motor driver, a signal processing circuit for processing an analog signal communicated to write or read data to or from a magnetic data recording medium, and a controller for controlling the stepping motor driver and the signal processing circuit. The signal processing circuit is arranged between the stepping motor driver and the temperature monitoring circuit. This minimizes the variation of the ground level of the temperature monitoring circuit that occurs every time the stepping motor driver is turned on or off and thereby makes accurate monitoring of the temperature possible.

REFERENCES:
patent: 5588092 (1996-12-01), Komiya et al.
patent: 5594603 (1997-01-01), Komiya et al.

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