ata5279n ATMEL Corporation, ata5279n Datasheet - Page 12

• Manufacturer Part Number: ata5279n
• Description: Antenna Driver For Multiple Antennas
• Manufacturer: ATMEL Corporation

12
ATA5279N [Preliminary]
The second example circuit has two faults in the circuitry.
Figure 3-6.
If channel four is activated in normal operation, a fault shutdown will occur. The reason for this
shutdown (i.e., the entry in the fault register) could either be an overload on the A4P line (here a
short circuit to VS) or a short-circuit on the A4N line to VS. In any case, the IC protects itself and
the external components from damage; however, the fact that there is more than one failure in
the wiring cannot be discovered.
In diagnosis mode, by testing the A4P line with S_H4P and S_L4P, the short circuit to VS could
be found first. The same result would be found when testing the return line switch 4 accordingly,
so the presence of more than one fault on coil 4 is determined. The precise fault cannot be found
though. The diagnosis result would be the same both for the above shown circuit and for the
A4N line being directly shorted to VS (without the failure in the coil module, here R
the combination of the two.
Example 2, Using the Diagnosis Mode
S_H4P
S_L4P
Status_4
A4P
R
Short1
GND
VDS
R
Short2
Status_4N
A4N
S_H4N
S_L4N
9125C–RKE–01/09
Shunt2
) and for