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CXA1829N

8ch. Read/Write Amplifier for Thin Film Heads of Hard Disk Drive

Sony Semiconductor 

CXA1829N

Write-unsafe detection circuit (refer to the “Notes on Operation.”)

This circuit detects write errors.

In normal Write mode, the WUS output is low; in the conditions listed below, it is high.

• Head input is open.

• Head input is shorted to GND or VCC.

• Write data frequency is abnormally low.

• There is no Write current.

• In Read mode

• In Power save mode

• Supply voltage is abnormal (refer to the “Power supply ON/OFF detection.”)

Power supply ON/OFF detection

This circuit monitors VCC to detect erroneous Writes.

The error status is established when VCC falls below the threshold voltage (VTH) of the power supply ON/OFF

detector, in which case the recording and playback functions are prohibited.

When VCC rises above VTH, the prohibition of these functions is released.

Application Circuit

PULSE

DETECTOR

+5V

1µ

RW 10k

3.9k

30 29 28 27 26 25 24 23 22 21 20 19 18 17 16

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Fig. 5

Application circuits shown are typical examples illustrating the operation of the devices. Sony cannot assume responsibility for

any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.

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