Philips TDA5360

1998 July 30

Philips Semiconductors Objective Specification, Revision 2.2

Pre-Amplifier for Hard Disk Drive with

MR-Read / Inductive Write Heads TDA5360

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 0000

Read Write current present 0001

Fault code not used 0010

Thermal Asperity detected 0011

Read head open 0100

Write No write current 0101

Write Data frequency to low 0110

Write head open 0111

Write head shorted to GND 1000

Both Rext open or short 1001

Write to read head short 1010

Low Vcc or Low Vee 1011

Fault code not used 1100

Illegal head address 1101

Fault code not used 1110

Temperature too high 140 C 1111