2 fault mode – Philips TDA5360 User Manual
Page 13
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