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L9678P Datasheet(PDF) 192 Page - STMicroelectronics

Part # L9678P
Description  Automotive user configurable airbag and battery cut-off IC
PDF  215 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9678P Datasheet(HTML) 192 Page - STMicroelectronics

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Electrical characteristics
L9678P, L9678P-S
192/216
DS11626 Rev 9
16.17
Squib/pyroswitch diagnostic
16.17.1 Squib/pyroswitch resistance measurement
All electrical characteristics are valid for the following conditions unless otherwise noted.
-40 °C  Ta  +95 °C, VINGOOD1(max)  VIN  35 V, 6 V  SSxy  35 V; 7V  VRESDIAG 
35V.
9
TFLT_LIM_LS
Low-side overcurrent to low-side
deactivation deglitch time in short
to battery condition
-
80
100
120
µs
10 TOFF_OS_HS
Low-side overcurrent to high-side
deactivation deglitch time in case
of intermittent open
squib/pyroswitch condition
-
-
-
20
µs
11 TOFF_OS_HS
High-side off time in case of
intermittent open squib/pyroswitch
condition
-
4
-
12
µs
Table 48. Deployment drivers - AC specifications (continued)
N°
Symbol
Parameter
Condition
Min.
Typ.
Max. Unit
Table 49. Deployment drivers diagnostics (Squib/pyroswitch resistance)
N°
Symbol
Parameter
Condition
Min. Typ. Max.
Unit
1
RSQ_RANGE_1
Squib/pyroswitch
Resistance Range 1
LPDIAGREQ(ISRC_CURR_SEL)= 0
0
-
10
Ω
2
RSQ_RANGE_2
Squib/pyroswitch
Resistance Range 2
LPDIAGREQ(ISRC_CURR_SEL)= 1
0
-
50
Ω
3
GRSQ
Squib/pyroswitch
resistance
measurement
differential amplifier
gain
-
-2%
5.2
+2%
V/V
4
VOFF_RSQ
Squib/pyroswitch
Resistance
Measurement
Differential Amplifier
Output Offset
VOUT_RSQ = GRSQ x (VSF – VSR) +
Voff_RSQ
200
-
400
mV
5
ISRC_HI_SF
ISRC_HI_SR
Squib/pyroswitch
resistance
measurement high
current source
RSQ_RANGE = 1 Ωto 10 Ω
LPDIAGREQ(ISRC_CURR_SEL) = 0
LPDIAGREQ(ISRC) = "01" or "10"
-5%
40
+5%
mA
6
ISRC_LO_SF
ISRC_LO_SR
Squib/pyroswitch
resistance
measurement low
current source
RSQ_RANGE = 1 Ωto 50 Ω
LPDIAGREQ(ISRC_CURR_SEL) = 1
LPDIAGREQ(ISRC) = "01" or "10"
-10%
8
+10%
mA



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