Title:
SIGNAL PROCESSING CIRCUIT DEVICE FOR MAGNETIC DISK DRIVE DEVICE, AND MAGNETIC DISK DRIVE DEVICE
Document Type and Number:
Japanese Patent JP3792082
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce such trouble as destruction of circuit elements caused by abnormality of power source voltage by providing a circuit outputting an over- voltage detecting signal indicating that applied power source voltage is higher than the prescribed value and a circuit receiving this signal and making the prescribed circuit be in a standby state.
SOLUTION: A floppy disk drive(FDD) device is provided with a signal processing circuit device 50 for a FDD device being one integrated circuit device in which an interface drive circuit 1, a control circuit 2, a read-write circuit 3, a stepping motor drive circuit 4, and an over-voltage detecting circuit 12 are integrated. The over-voltage detecting circuit 12 outputs an over-voltage detecting signal to the control circuit 2 when power source voltage applied to the signal processing circuit device 50 is higher than the prescribed value. The control circuit 2 sets the interface drive circuit 1, the read-write circuit 3 and the stepping drive circuit 4 to be in a standby state while an over-voltage detecting signal is outputted.
Inventors:
Yamamoto Minehisa
Akira Nakamura
Akira Nakamura
Application Number:
JP24529399A
Publication Date:
June 28, 2006
Filing Date:
August 31, 1999
Export Citation:
Assignee:
ROHM Co., Ltd.
International Classes:
G06F3/06; G11B19/00; G06F1/28; G11B5/02; G11B19/02; G11B31/00; (IPC1-7): G11B19/02; G06F3/06; G11B5/02
Domestic Patent References:
| JP58749U | ||||
| JP54040U | ||||
| JP541346U |
Attorney, Agent or Firm:
Shizuo Sano
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