1EDI2001AS_15 Datasheet, PDF (46/135 Pages) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

EiceDRIVER™ SIL
1EDI2001AS
Functional Description
2.4.7 Fault Notifications
The device provides two kinds of fault notification mechanisms:
• Pins NFLTA, NFLTB and NRST/RDY allow for fast error notification to the main microcontroller. All signals are
active low.
• Error bits can be read by SPI.
The activation of signal NRST/RDY is associated with Reset Events (see Chapter 2.4.9). The activation of signal
NFLTA is associated with Class A Events. The activation of signal NFLTB is associated with Class B Events. In
general the activation of signal NFLTA or NFLTB is linked to a state transition of the state machine.
If an Event Class A occurs that leads to a state transition (from OPM4 to OPM3 or OPM6 to OPM5), signal NFLTA
is activated. In case an Event Class A occurs that does not lead to a state transition, NFLTA is not activated
(exception: tristate events). However, the corresponding error bit in register PER or SER is set.
Tristate events are handled in a special way. Tristate events can be generated either by the output stage
monitoring (when enabled) or by a High Level at pin OSD.
In case bit SCFG.OSMD is set, the OSM is completely disabled and therefore can not generate any tristate events
(and consequently it can not generate Events Class A).
In case bit SCFG.OSDAD is set, a transition to High Level of pin OSD does not generate any state transition. As
a result, no Event Class A is generated. However, bit SER.OSTER is set and the output stage is in tristate for the
duration for which pin OSD is at High Level.
Additionally, signal NFLTA can be activated directly by the status bits on the primary side.This allows to have
signal NFLTA activated in any OPM mode in case of tristate events. If PCFG.OSTAEN is set, NFLTA is activated
at the transition of bit PER.OSTER from 0_B to 1_B. If PCFG.OSMAEN is set, NFLTA is activated at the transition of
bit PSTAT2.OSTC from 0_B to 1_B. In case both bits PCFG.OSTAEN and PCFG.OSMAEN are cleared, NFLTA is
only activated in case of a state transition of the state machine.
If an Event Class B occurs that leads to a state transition (to OPM1), signal NFLTB is activated. In case an Event
Class B occurs that does not lead to a state transition, NFLTB is not activated. However, the corresponding error
bit in register PER or SER is set.
Table 2-12 describes how failure notifications are cleared:
Table 2-12 Failure Notification Clearing
NFLTA / B signals
Primary Sticky Bits
PCTRL.CLRP set
De-assertion
Cleared
PCTRL.CLRS set ¹⁾
-
-
EN Invalid to Valid transition
De-assertion ²⁾
-
1)If the device is in OPM1, setting bit SCTRL.CLRS leads to a transition to OPM0
2) Only in OPM3 and OPM5. In other Operating Modes, no de-assertion is done.
Secondary Sticky Bits
-
Cleared
-
The level issued by the device on pins NFLTA and NFLTB is given by bits PSTAT2.FLTA and PSTAT2.FLTB.
The levels read by the device at those pins is given by bits PPIN.NFLTAL and PPIN.NFLTBL.
2.4.8
EN Signal Pin
The EN signal allows the logic on the primary side to have a direct control on the state of the device. A valid signal
has to be provided on this pin. A valid to invalid transition of the signal on pin EN generates an Event Class A.
Datasheet
46
Hardware Description
Rev. 3.1, 2015-07-30