1EDI2001AS_15 Datasheet, PDF (70/135 Pages) Infineon Technologies AG – Single Channel Isolated Driver for Inverter Systems AD Step

EiceDRIVER™ SIL
1EDI2001AS
Protection and Diagnostics
3.5.3
DESAT Supervision Level 1
The DESAT Supervision Level 1 functionality is summarized in Table 3-13:
Table 3-13 DESAT Supervision Level 1 Overview
Parameter
Short Description
Function
Supervision of the DESAT functionality.
Periodicity
On request.
Action in case of failure event N.a.
Programmability
No
In-System Testability
No
The purpose of the DESAT Supervision Level 1 function is to verify that the DESAT feature is operational over the
whole life time of the application. Since the DESAT supervision is intrusive, it is intended to be executed when the
device is in Mode OPM5 and OPM6 (e.g. after power-up during the initialization phase). This mechanism aims at
generating artificially a DESAT error, verifying that it is recognized by the device and that an error notification is
correctly issued to the primary logic.
When this function is triggered, the driver enters a special mode where the signal input of the comparator is
internally pulled up above the threshold voltage (see Figure 3-1). The DESAT function works normally otherwise.
When the device enters OPM6 and turns on, after the blanking time has elapsed, a DESAT error is generated,
with the corresponding actions being triggered by the device.
The INP signal is issued at the output stage (weak turn-on).
3.5.4
DESAT Supervision Level 2
The DESAT Supervision Level 2 functionality is summarized in Table 3-14:
Table 3-14 DESAT Supervision Level 2 Overview
Parameter
Short Description
Function
Supervision of the DESAT functionality.
Periodicity
On request.
Action in case of failure event N.a.
Programmability
No
In-System Testability
No
The purpose of the DESAT Supervision Level 2 function is to verify that the DESAT feature is operational over the
whole life time of the application. Since the DESAT supervision is intrusive, it is intended to be executed when the
device is in Mode OPM5 and OPM6 (e.g. after power-up during the initialization phase). This mechanism aims at
generating artificially a DESAT error, verifying that it is recognized by the device and that an error notification is
correctly issued to the primary logic.
When this function is triggered, the driver enters a special mode where, as soon as the device is in OPM6 and a
PWM turn-on command is received, no action is executed on the output stage. However, the DESAT logic works
normally. It means that after the blanking time has elapsed, the voltage on pin DESAT should exceed the DESAT
threshold level, leading to a DESAT error, with the corresponding actions being triggered by the driver.
The INP signal is not issued at the output stage.
Datasheet
70
Hardware Description
Rev. 3.1, 2015-07-30