ATA5279_10 ATMEL [ATMEL Corporation], ATA5279_10 Datasheet - Page 12
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ATA5279_10
Manufacturer Part Number
ATA5279_10
Description
Antenna Driver for Multiple Antennas
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATA5279_10.pdf
(39 pages)
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12
Atmel ATA5279
The second example circuit has two faults in the circuitry.
Figure 3-5.
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 fail-
ure 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 cir-
cuit and for the A4N line being directly shorted to VS (without the failure in the coil module,
here R
Shunt2
) and for 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
9125I–RKE–09/10
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