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L9001 Datasheet(PDF) 36 Page - STMicroelectronics

Part # L9001
Description  Automotive power supply IC with multiple voltage regulators
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9001 Datasheet(HTML) 36 Page - STMicroelectronics

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Appendix B
L9001
36/38
DS12089 Rev 2
Appendix B
The following table summarizes what happens if a fault condition is detected in SAFE state
indicating the next state and the behavior of FC, Refresh FC counter and thresholds.
Table 21. Clarify transitions from and to SAFE mode
Fail / Current status
SAFE
due to VS undervoltage
SAFE
due to Overtemperature
SAFE
due to CP undervoltage
VS undervoltage
–
– SAFE state
– FC=FC
– Refresh FC threshold =
30 s
– Refresh FC restart from
0 when device comes
back in ACTIVE
– SAFE state
– FC=FC
– Refresh FC threshold
= 100 ms
– Refresh FC restart from
0 when device comes
back in ACTIVE
Overtemperature
– FC= FC+1 → SAFE state
if FC < 4
– FC = FC+1 → Latch
state if FC = 4
– Refresh FC threshold
= 30 s
– Refresh FC restart from
0 if device comes back in
ACTIVE
–
– SAFE state
– FC = FC (it is already
incremented one time)
– Refresh FC threshold
=30s
– Refresh FC restart from
0 when device comes
back in ACTIVE
CP undervoltage
– FC= FC+1 → SAFE state
if FC < 4
– FC= FC+1 →Latch state
if FC = 4
– Refresh FC threshold
= 100 ms
– Refresh FC restart from
0 if device comes back in
ACTIVE
– SAFE state
– FC = FC (it is already
incremented one time)
– Refresh FC threshold
= 30 s
– Refresh FC restart from
0 when device comes
back in ACTIVE
–



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