1998 July 30

Philips Semiconductors

Objective Specification, Revision 2.2

Pre-Amplifier for Hard Disk Drive with

MR-Read / Inductive Write Heads

TDA5360

13

10.2

Fault Mode

Fault conditions are indicated on the FLT pin (HIGH during write mode and LOW during read mode). The fault condition

is coded and stored in Reg. 07 for monitoring purposes. The fault code is cleared on power up, on system reset and on

writing to Reg.09

The FLT output is an open collector to an external resistor of 5Kohms connected to +5V.

Table 1: Fault Conditions

Mode

Fault condition

FCOD3

FCOD2

FCOD1

FCOD0

Both

No fault

0

0

0

0

Read

Write current present

0

0

0

1

Fault code not used

0

0

1

0

Thermal Asperity detected

0

0

1

1

Read head open

0

1

0

0

Write

No write current

0

1

0

1

Write Data frequency to low

0

1

1

0

Write head open

0

1

1

1

Write head shorted to GND

1

0

0

0

Both

Rext open or short

1

0

0

1

Write to read head short

1

0

1

0

Low Vcc or Low Vee

1

0

1

1

Fault code not used

1

1

0

0

Illegal head address

1

1

0

1

Fault code not used

1

1

1

0

Temperature too high

140 C

1

1

1

1