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L9679E Datasheet(PDF) 105 Page - STMicroelectronics

Part # L9679E
Description  Automotive battery cut-off circuit and airbag system expansion IC
PDF  127 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679E Datasheet(HTML) 105 Page - STMicroelectronics

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 105 / 127 page
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Symbol
Parameter
Comments / Conditions
Min
Typ
Max
Unit
TFLT_ILIM_LS
Low-side
Overcurrent to low-
side deactivation
deglitch time in short
to battery condition
-
80
100
120
µs
TFLT_OS_LS
Low-side overcurrent
to high-side
deactivation deglitch
time in case of
intermittent open to
squib/pyroswitch
condition
-
-
-
20
µs
TOFF_OS_HS
High-side off time in
case of intermittent
open to squib/
pyroswitch condition
-
4
-
12
µs
13.8
Deployment driver diagnostic
13.8.1
Squib/Pyroswitch resistance measurement
All electrical characteristics are valid for the following conditions unless otherwise noted:
-40 °C ≤ Tamb ≤ +105 °C
VSAT_ON(max) ≤ VSAT ≤ VSAT(max)
6 V ≤ SSxy ≤ 35 V
7 V ≤ VSYNC ≤ 35 V
Table 29. Deployment drivers diagnostics - squib/pyroswitch resistance measurement
Symbol
Parameter
Comments / Conditions
Min
Typ
Max
Unit
RSQ_RANGE_1
Squib/Pyroswitch resistance range
1
LPDIAGREQ(ISRC_CURR_SEL)=0
0
10.0
Ω
RSQ_RANGE 2
Squib/Pyroswitch resistance range
2
LPDIAGREQ(ISRC_CURR_SEL)=1
0
50.0
Ω
GRSQ
Squib/Pyroswitch resistance
measurement differential amplifier
gain
VOUT_RSQ = GRSQ x [(VSF – VSR)] + Voff_RSQ
-2%
5.2
+2%
V/V
Voff_RSQ
Squib/Pyroswitch resistance
measurement differential amplifier
offset
VOUT_RSQ = GRSQ x [(VSF – VSR)] + Voff_RSQ
200
400
mV
ISRC_HI_SF
ISRC_HI_SR
Squib/Pyroswitch resistance
measurement high current source
LPDIAGREQ(ISRC_CURR_SEL)=0
LPDIAGREQ(ISRC)=”01” or “10”
-5%
40
+5%
mA
ISRC_LO_SF
ISRC_LO_SR
Squib/Pyroswitch resistance
measurement low current source
LPDIAGREQ(ISRC_CURR_SEL)=1
LPDIAGREQ(ISRC)=”01” or “10”
-10%
8
+10%
mA
ISRC_DELTA
Squib/Pyroswitch resistance
measurement delta current source
ISRC_HI_x - ISRC_LO_x
-5%
32
+5%
mA
SRISRC
Squib/Pyroswitch resistance
measurement current source slew-
rate
-
3
7.5
12
mA/µs
VSRx_RM
SRx voltage during resistance
measurement
LPDIAGREQ(ISRC)=”01” or “10”
LPDIAGREQ(ISINK)=1
0.4
0.7
1.2
V
ISINK_HI_SR
SRx current sink limit high
LPDIAGREQ(ISRC_CURR_SEL)=0
LPDIAGREQ(ISINK)=1
50
75
100
mA
L9679E
Electrical characteristics
DS12485 - Rev 8
page 105/127



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