ATA5279P-PLQW Atmel, ATA5279P-PLQW Datasheet - Page 8

• Manufacturer Part Number: ATA5279P-PLQW
• Description: IC ANTENNA DVR SIX-FOLD 48QFN
• Manufacturer: Atmel

Specifications of ATA5279P-PLQW

• Rf Type: PEG, TPMS
• Frequency: 125kHz
• Features: RSSI Equipped
• Package / Case: 48-VQFN Exposed Pad, 48-HVQFN, 48-SQFN, 48-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.6
8
Diagnosis
Atmel ATA5279
The IC allows the use of a current step not intended for a particular driver group; however, in
this case, full functionality, especially a stabilized coil current, cannot be guaranteed. See also
the Control Logic block description for an overview over the commands.
The diagnosis stage monitors both the positive (AxP) and negative (AxN) connection lines of
the six coils. If one of these lines is shorted to battery supply or to ground, the following mea-
sures are taken for protection and diagnostic reasons:
In addition to short circuits, a disconnected coil (i.e., open load) or an excessive junction tem-
perature can also lead to such a fault shutdown.
Note that this type of diagnosis is carried out continuously during normal operation of the IC to
protect both the IC and the peripherals from damage.
It must be avoided to design the system's load profile in such a way that the protection fea-
tures of the chip are triggered under normal operating conditions. Consecutive triggering of the
overtemperature shutdown may lead to a reduced lifetime.
In the event of such a fault shutdown, the IC can be brought back to operation by resetting its
fault register with the appropriate SPI command (please refer also to the
eral Command Description” on page 21
non- faulty coils is still possible even if there is a failure of one coil.
Beyond this, the diagnosis of all connected coil lines is a very useful tool for maintenance rea-
sons. The Atmel
out via SPI commands, so that the microcontroller can be programmed to detect most of the
possible faults, for example, shorts between different coil connection lines and multiple shorts
in one pair of lines.
• All coil driver stages are shut down, i.e., put into high impedance state
• The shunt resistor is disconnected from the coil return lines
• The reason for the fault shutdown is stored in the fault register
• An interrupt request is triggered (see also control logic block)
®
ATA5279 has implemented test structures that can be activated and read
later in this document). As a result, transmission on
Section 3.9.2 “Gen-
9125L–RKE–03/11