™
PROFET + 24V
BTT6200-4ESA
Diagnostic functions
7
Diagnostic functions
For diagnosis purposes, the BTT6200-4ESA provides a combination of digital and analog signals at pin IS. These
signals are called SENSE. In case the diagnostic is disabled via DEN, pin IS becomes high impedance. In case
DEN is activated, the sense current of the channel X is enabled/disabled via associated pins DSEL0 and DSEL1.
Table 8 gives the truth table.
Table 8
Diagnostic truth table
DEN
DSEL1
DSEL0
IS
Z
0
1
1
1
1
don't care
don't care
Z
Z
Z
0
0
1
1
0
1
0
1
IIS(0)
0
0
0
0
IIS(1)
0
0
0
0
IIS(2)
0
0
0
0
IIS(3)
7.1
IS pin
The BTT6200-4ESA provides a sense signal called IIS at pin IS. As long as no “hard” failure mode occurs (short
circuit to GND / current limitation / overtemperature / excessive dynamic temperature increase or open load at
OFF) a proportional signal to the load current (ratio kILIS = IL / IIS) is provided. The complete IS pin and diagnostic
mechanism is described in Figure 20. The accuracy of the sense current depends on temperature and load
current. The sense pin multiplexes the currents IIS(0), IIS(1), IIS(2) and IIS(3) via the pins DSEL0 and DSEL1. Thanks to
this multiplexing, the matching between kILISCHANNEL0, kILISCHANNEL1, kILISCHANNEL2 and kILISCHANNEL3 is optimized.
Due to the ESD protection, in connection to VS, it is not recommended to share the IS pin with other devices if
these devices are using another battery feed. The consequence is that the unsupplied device would be fed via
the IS pin of the supplied device.
VS
IIS3
IL3 / kILIS
=
IIS1
IL1 / kILIS
=
IIS0
IL0 / kILIS
=
IIS2
IL2 / kILIS
=
IIS(FAULT)
ZIS(AZ)
0
1
0
1
FAULT
1
0
IS
DEN
0
1
FAULT
DSEL1
Sense schematic.vsd
DSEL0
Figure 20
Diagnostic block diagram
Datasheet
26
Rev. 1.00
2019-03-09
INFINEON [ Infineon ]
