BTS7040-1EPA
PROFET™ +2 12V
Diagnosis
IN
t
t
Short circu it
to ground
nRETRY(CYC)
"retry" cycle
nRETRY(CR)
nRETRY(NT)
nRETRY(NT)
IL
t
tRETRY
tRETRY
tDELA Y(CR)
In ter nal
counter
0
1
nRETRY(CR)
nRETRY(CR) + nRETRY(NT)
nRETRY(CR) + (nRETRY(CYC) * nRETRY(NT)
)
0
t
DEN
t
IIS(FAUL T)
IIS(FAUL T)
IIS(FAUL T)
IL / kILIS
IIS
t
Diagnosis_PROFET_IISFAULT.emf
Figure 36 SENSE behavior in Fault condition
IIS
IIS(SA T),max
IIS(SAT)
IIS(FAUL T),max
IIS(FAUL T)
IIS(SA T),min
=
IIS(FAUL T),min
IL / kILIS
IL(OVL)
IL
Diagnosis_PROFET_IISFAULT_IISSAT.emf
Figure 37 SENSE behavior - overview
9.3
Diagnosis in OFF state
When a power output stage is in OFF state, the BTS7040-1EPA can measure the output voltage and compare
it with a threshold voltage. In this way, using some additional external components (a pull-down resistor and
a switchable pull-up current source), it is possible to detect if the load is missing or if there is a short circuit to
battery. If a Fault condition was detected by the device (the internal counter has a value different from the
reset value, as described in Chapter 9.2.2) a current IIS(FAULT) is provided by IS pin each time the channel
diagnosis is checked also in OFF state.
Data Sheet
46
Rev. 1.10
2020-12-14
INFINEON [ Infineon ]
