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L9965P Datasheet(PDF) 50 Page - STMicroelectronics

Part # L9965P
Description  Automotive single channel pyro-fuse driver
PDF  104 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9965P Datasheet(HTML) 50 Page - STMicroelectronics

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Table 28. FETs test results
PR_STG
PF_STB
Result
PF(HS) FET test
0
0
PF FET fail
0
1
PF FET test pass OR leakage to battery
1
0
PF STG fail
1
1
PF FET test pass OR leakage to battery followed by leakage to ground
PR(LS) FET test
0
0
PR FET fail
0
1
PR STB fail
1
0
PR FET test pass OR leakage to ground
1
1
PR FET test pass OR leakage to ground followed by leakage to battery
3.7.2.7
ER capacitor diagnostic
This step aims at verifying the integrity of the energy reserve capacitor (ER CAP). This is achieved by measuring
the following quantities:
•
Effective capacitance value of CERBST electrolytic capacitor.
•
Equivalent series resistance (ESR) of CERBST electrolytic capacitor.
Figure 24. ER capacitor diagnostic
spike
due to
ESL
ΔVESR1
t0
IDLE
CONV
ERBST
ADC
tCONV
WAIT
tWAIT
V0
CONV
V1
t1
tCONV
CONTINUOUS
ΔVESR2
ΔVER
tDCH = N*tCONV
tWAIT
CONV
V3
t2
t3
tCONV
VERBST_REG
BOOST ENABLED
IDLE
ENABLED
IDLE
WAIT
tWAIT
CONV
V2
tCONV
WAIT
spike
due to
ESL
These two measurements are done by the IC at the same time, by activating the ER discharge switch and
measuring the voltage drop on ERBST pin and current flowing in RERDCHSW.
L9965P
Functional description
DS14702 - Rev 4
page 50/104



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