ST L9679E-EVB User manual
Introduction
The L9679E-EVB evaluation board allows the user to evaluate the L9679E device. The board provides the main input and
output capabilities needed to properly drive the IC.
Evaluation board for L9679E airbag and battery cut-off IC
UM3145
User manual
UM3145 - Rev 1 - March 2023
For further information contact your local STMicroelectronics sales office.
www.st.com
1Hardware description
The L9679E-EVB evaluation board has been developed to allow to the user total access to the pins to simplify the
probing of each signal.
Its main features are:
• L9679E placed into a socket allowing an easy change of the samples.
• Possibility to solder L9679E directly on the PCB.
• Total accessibility to all pins through test points
• L9679E board equipped with the IC external components and jumpers to fix the L9679E setup configuration.
• Motherboard equipped with microcontroller to drive in the most flexible way the L9679E signals.
Figure 1. L9679E-EVB evaluation board with socket
UM3145
Hardware description
UM3145 - Rev 1 page 2/23
Figure 2. L9679E-EVB evaluation board with soldered sample
UM3145
Hardware description
UM3145 - Rev 1 page 3/23
2Board schematics
Figure 3. Board schematic - #1
SR4
R2
330/2W
UAR3
C3
100nF/35V
SR4
1
SF4
2
SG45
3
SS45
4
SF5
5
SR5
6
SR0
7
SF0
8
SG01
9
SS01
10
SF1
11
SR1
12
RSU0
13
RSU1
14
VSAT
16
VSYNC
15
GNDA
17
FEN1
18
FEN2
19
SATSYNC
20
RESET_N
21
TEST
22
RSU2
23
RSU3
24
SR3 25
SF3 26
SS23 27
SG23 28
SF2 29
SR2 30
SR7 31
SF7 32
SS67 33
SG67 34
SF6 35
SR6 36
CVDD 37
GNDD 38
FENL 39
SCLK_RS 40
CS_RS 41
MOSI_RS 42
MISO_RS 43
VCC 44
MISO_G 45
MOSI_G 46
SCLK_G 47
CS_G 48
U1
UAR3
SF4
SG45
SS45
SF5
SR5
SR0
SF0
SG01
SS01
SF1
SR1
RS U1
RS U0
VSAT
VSYNC
GNDA
FE N1
FE N2
S ATS YNC
RE S ET
TES T
RS U2
RS U3
SR3
SF3
SS23
SG23
SF2
SR2
SR7
SF7
SS67
SG67
SF6
SR6
CVDD
GNDD
FENL
SCLK_RS
CS _R S
MOS I_RS
MISO_RS
VCC
MISO_G
MOS I_G
SCLK_G
CS _G
VER
GND
D2
S1B
C4
4700uF/35V
GND
S_ER R1
100/2W
GND
C11
10nF/35V
GND
SS01
C12
10nF/35V
SS67
GND
C14
10nF/35V
GND
C15
10nF/35V
GND
SS23
SS45
VCC
RES ET
J3
J_C_ER
J13
J_SS01
J14
J_SS23
J18
J_SS45
J19
J_SS67
C1
100nF/35V
VSYNC
C7
2.2uF/35V
GND
J7
J_FEN1
J9
J_FEN2
J11
J_FENL
VCC FEN1
FEN2
FENL
C13
100nF/16V
GND
C9
2.2uF/35V
VCC
C18
100nF/25V
GND
C16
2.2uF/35V
VSAT
CVDD
C2
100nF/16V
GND
GNDD
GNDA
GND
SG01
SG23
SG45
SG67
SCLK_RS
MOS I_RS
MISO_R S
CS _R S
FEN1
FEN2
MOS I_G
CS _G
SCLK_G
MISO_G
SATSYNC
TES T
GND
GND
GND
GND
ne ar to pin 37
ne ar to pin 10
ne ar to pin 4 ne ar to pin 33
ne ar to pin 27
GND
1
2
J1
GND 1
2
J2
CON2
VSYNC
VCC
VSAT
1
2
3
4
J31
VER
GND
EX-PAD 0
SR4
1
SF4
2
SG45
3
SS45
4
SF5
5
SR5
6
SR0
7
SF0
8
SG01
9
SS01
10
SF1
11
SR1
12
RSU0
13
RSU1
14
VSAT
16
VSYNC
15
GNDA
17
FEN1
18
FEN2
19
SATSYNC
20
RESET_N
21
TEST
22
RSU2
23
RSU3
24
SR3 25
SF3 26
SS23 27
SG23 28
SF2 29
SR2 30
SR7 31
SF7 32
SS67 33
SG67 34
SF6 35
SR6 36
CVDD 37
GNDD 38
FENL 39
SCLK_RS 40
CS_RS 41
MOSI_RS 42
MISO_RS 43
VCC 44
MISO_G 45
MOSI_G 46
SCLK_G 47
CS_G 48
U2
UAR3
SR4
SF4
SG45
SS45
SF5
SR5
SR0
SF0
SG01
SS01
SF1
SR1
RS U1
RS U0
VSAT
VSYNC
GNDA
FE N1
FE N2
S ATS YNC
RE S ET
TES T
RS U2
RS U3
EX_PAD
SR3
SF3
SS23
SG23
SF2
SR2
SR7
SF7
SS67
SG67
SF6
SR6
CVDD
GNDD
FENL
SCLK_RS
CS _R S
MOS I_RS
MISO_RS
VCC
MISO_G
MOS I_G
SCLK_G
CS _G
SOCKET DEVICE
J30
FENL
11
2
2
J24
GOUTTE CONTACT
GND
Place to th e 4 corners of the board
C19
100nF/16V
R3
1k
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
J4
CON15
RES ET
J32
RESET
1
2
3
4
5
6
7
8
9
10
11
12
J35
CON12
1
2
3
4
5
6
7
8
9
10
11
12
J33
CON12
1
2
3
4
5
6
7
8
9
10
11
12
J36 CON12
1
2
3
4
5
6
7
8
9
10
11
12
J34 CON12
S2
Reset
ne ar to pin 16
ne ar to pin 44
ne ar to pin 15
GND
bo ttom layer
bo ttom layer
bo ttom layer
ne ar the device
ne ar the device
ne ar the device
ne ar J31
ne ar J31
ne ar J31
bo ttom layer
bo ttom layer
bo ttom layer ne ar the device or socket ne ar the device or socket
ne ar the device or socketne ar the device or socket
S1
CLOSE ONLY ON SOCKETBOARD
UAR3
Figure 4. Board schematic - #2
C26
22nF/35V
R12
3.3
C21
2.2nF/35V
GND
GND
RSU0
C27
22nF/35V
R13
3.3
C22
2.2nF/35V
GND
GND
RSU1
C23
22nF/35V
R14
3.3
C24
2.2nF/35V
GND
GND
RSU2
C28
22nF/35V
R15
3.3
C25
2.2nF/35V
GND
GND
RSU3
L_RSU0
L_RSU1
L_RSU2
L_RSU3
near the device near the device near the device near the device
C29
22nF/35V
GND
J69
J_SQ0
R28
2
SF0
SR0
C33
22nF/35V
GND
C30
22nF/35V
GND
J70
J_SQ1
R29
2
SF1
SR1
C34
22nF/35V
GND
C31
22nF/35V
GND
J71
J_SQ2
R30
2
SF2
SR2
C35
22nF/35V
GND
C32
22nF/35V
GND
J73
J_SQ3
R31
2
SF3
SR3
C36
22nF/35V
GND
J6 J8 J10 J20
1
2
J17
1
2
J12
1
2
J15
1
2
J16
SF0 SF1 SF2 SF3
SR0 SR1 SR2 SR3
near J12
near J12
near J15
near J15
near J16
near J16
near J17
near J17
C37
22nF/35V
GND
J83
J_SQ4
R32
2
SF4
SR4
C41
22nF/35V
GND
C38
22nF/35V
GND
J84
J_SQ5
R33
2
SF5
SR5
C42
22nF/35V
GND
C39
22nF/35V
GND
J85
J_SQ6
R34
2
SF6
SR6
C43
22nF/35V
GND
GND
J87
J_SQ7
R35
2
SF7
SR7
GND
C40
22nF/35V
C44
22nF/35V
J23J22J21 J29
1
2
J28
1
2
J27
1
2
J26
1
2
J25
SF4 SF5 SF6 SF7
SR4 SR5 SR6 SR7
near J28
near J28
near J27
near J27
near J26
near J26
near J25
near J25
All capacitors and resistors in the bottom side
1
2
3
4
5
J5 CON5
GND
GND
UM3145
Board schematics
UM3145 - Rev 1 page 4/23
3Board layout
Figure 5. Assembly Top
RSU
connections
Supply
connections
Eventual different
C_ER connections
VER
connections C_ER
C_ER
discharge
SQUIB
configuration
SQUIB
connections
SQUIB
connections
SQUIB
configuration
In the Figure 5 are identified the following connectors:
• Terminal connectors for power supplies (J31)
• Terminal connectors for Squibs connection (J12, J15, J16, J17, J25, J26, J27, J28)
• Terminal connector for RSUs connection (J5)
• Terminal connector for digital signals (J4)
• Terminal connector for VER (J1)
• Terminal connector to eventually add/change C_ER (J2)
UM3145
Board layout
UM3145 - Rev 1 page 5/23
Figure 6. Assembly Bottom
UM3145
Board layout
UM3145 - Rev 1 page 6/23
4Jumpers and connectors description
In Table 1, the name of each jumper on the board is listed while their default setting (closed or open) is reported in
green; the name of the connectors and test points present on the board is also remarked.
Table 1. Jumpers and connectors description
# Name J = Jumper
C = Connector Function Jumper closed/signal
connection
Jumper open/
signal NOT
connected
Test point
J1 VER C
Connection to the
external VER power
supply
VER line externally
supplied, connected to
VER of L9678, L9679
or L9680(1)
-
Terminals of J30 are
the test points for
VER supply (J1 side)
or C_ER (C_ER
side)
J2 CON2 C Connection of other
external C_ER
Other external C_ER
connected
No other external
C_ER connected(1) Terminal 1 of J2
J3 J_C_ER J To insert the on board
C_ER (C4)
On board C_ER (C4)
inserted(1)
On board C_ER
(C4) NOT inserted J3 itself
J4 CON15 C
Connections of the
digital signals (from
microcontroller)
Each signal is
connected to
the correspondent
line coming from
microcontroller(1)
Digital signals not
driven Each terminal of J4
J5 CON5 C Connections of RSU
sensors
Each RSUx interface
is connected to
the correspondent
sensor(1)
RSUx interface
NOT connected to
the correspondent
sensor
Each terminal of J5
J6 J Allow deployment with
SF0 shorted to GND SF0 shorted to GND SF0 NOT shorted to
GND The same of SF0 pin
J7 J_FEN1 J
FEN1 driven through
microcontroller or
stuck at VCC
FEN1 fixed at VCC
Do not connect J4-6 if
J7 is closed
FEN1 driven
through
microcontroller (J4-6
connected)(1)
The same of FEN1
pin
J8 J Allow deployment with
SF1 shorted to GND SF1 shorted to GND SF1 NOT shorted to
GND The same of SF1 pin
J9 J_FEN2 J
FEN2 driven through
microcontroller or
stuck at VCC
FEN2 fixed at VCC
Do not connect J4-5 if
J9 is closed
FEN2 driven
through
microcontroller (J4-5
connected)(1)
The same of FEN2
pin
J10 J Allow deployment with
SF2 shorted to GND SF2 shorted to GND SF2 NOT shorted to
GND The same of SF2 pin
J11 J_FENL J
FENL driven through
microcontroller or
stuck at VCC
FENL fixed at VCC
do not connect J4-4 if
J11 is closed
FENL driven
through
microcontroller (J4-4
connected)(1)
The same of FENL
pin
J12 C Connection of Squib0 SF0 and SR0
connected to squib 0(1)
SF0 and SR0 NOT
connected to squib
0
The same of SF0
and SR0 pins
J13 J_SS01 J Connection of SS01 to
C_ER
SS01 connected to
C_ER(1)
SS01 NOT
connected to C_ER
The same of
SS01pin
J14 J_SS23 J Connection of SS23 to
C_ER
SS23 connected to
C_ER(1)
SS23 NOT
connected to C_ER
The same of
SS23pin
UM3145
Jumpers and connectors description
UM3145 - Rev 1 page 7/23
# Name J = Jumper
C = Connector Function Jumper closed/signal
connection
Jumper open/
signal NOT
connected
Test point
J15 C Connection of Squib1 SF1 and SR1
connected to squib 1(1)
SF1 and SR1 NOT
connected to squib
1
The same of SF1
and SR1 pins
J16 C Connection of Squib2 SF2 and SR2
connected to squib 2(1)
SF2 and SR2 NOT
connected to squib
2
The same of SF2
and SR2 pins
J17 C Connection of Squib3 SF3 and SR3
connected to squib 3(1)
SF3 and SR3 NOT
connected to squib
3
The same of SF3
and SR3 pins
J18 J_SS45 J Connection of SS45 to
C_ER
SS45 connected to
C_ER(1)
SS45 NOT
connected to C_ER
The same of
SS45pin
J19 J_SS67 J Connection of SS67 to
C_ER
SS67 connected to
C_ER(1)
SS67 NOT
connected to C_ER
The same of
SS67pin
J20 J Allow deployment with
SF3 shorted to GND SF3 shorted to GND SF3 NOT shorted to
GND The same of SF3 pin
J21 J Allow deployment with
SF4 shorted to GND SF4 shorted to GND SF4 NOT shorted to
GND The same of SF4 pin
J22 J Allow deployment with
SF5 shorted to GND SF5 shorted to GND SF5 NOT shorted to
GND The same of SF5 pin
J23 J Allow deployment with
SF6 shorted to GND SF6 shorted to GND SF6 NOT shorted to
GND The same of SF6 pin
J24 J Allow to close TEST
pin to GND
TEST pin shorted to
GND(1) TEST pin left open -
J25 C Connection of Squib4 SF4 and SR4
connected to squib 4(1)
SF4 and SR4 NOT
connected to squib
4
The same of SF4
and SR4 pins
J26 C Connection of Squib5 SF5 and SR5
connected to squib 5(1)
SF5 and SR5 NOT
connected to squib
5
The same of SF5
and SR5 pins
J27 C Connection of Squib6 SF6 and SR6
connected to squib 6(1)
SF6 and SR6 NOT
connected to squib
6
The same of SF6
and SR6 pins
J28 C Connection of Squib7 SF7 and SR7
connected to squib 7(1)
SF7 and SR7 NOT
connected to squib
7
The same of SF7
and SR7 pins
J29 J Allow deployment with
SF7 shorted to GND SF7 shorted to GND SF7 NOT shorted to
GND The same of SF7 pin
J30 J Allow to reduce the
C4 charge current
C4 charge current NOT
limited through R2
C4 charge current
limited through R2(1) Each terminal of j30
J31 C
Connection to the
external VSYNC, VCC
and VSAT power
supply
VSYNC, VCC and
VSAT lines externally
supplied, connected
to VSYNC, VCC and
VSAT of the L9678,
L9679 or L9680(1)
-
Terminals J34_3,
J33_8 and J34_4
are the test pionts
for VSYNC, VCC
and VSAT power
supplies
J32 J
Allow to keep RESET
signal at VCC or
toggle it through S2
button
RESET permanently at
VCC/toggle (at GND)
through S2
RESET driven
by microcontroller
through J4_2
J32 terminal on
device side or J34_9
UM3145
Jumpers and connectors description
UM3145 - Rev 1 page 8/23
# Name J = Jumper
C = Connector Function Jumper closed/signal
connection
Jumper open/
signal NOT
connected
Test point
J33 CON12 C
Each terminal
J33_1:J33_12
corresponds to the
device pins from 1 to
12
- -
Each terminal
J33_1:J33_12
corresponds to the
device pins from 1 to
12
J34 CON12 C
Each terminal
J34_1:J34_12
corresponds to the
device pins from 13 to
24
- -
Each terminal
J34_1:J34_12
corresponds to the
device pins from 13
to 24
J35 CON12 C
Each terminal
J35_1:J35_12
corresponds to the
device pins from 25 to
36
- -
Each terminal
J35_1:J35_12
corresponds to the
device pins from 25
to 36
J36 CON12 C
Each terminal
J36_1:J36_12
corresponds to the
device pins from 37 to
48
- -
Each terminal
J36_1:J36_12
corresponds to the
device pins from 37
to 48
1. Default condition.
UM3145
Jumpers and connectors description
UM3145 - Rev 1 page 9/23
5Supply connections
Power supply connection is reported in Figure 7.
VSAT, that is the main power supply, can be connected to SATBUCK of L9779 or L9680 device; VSYNC can be
connected to SYNCBOOST of L9779 or L9680 device; VCC can be connected to VCCBUCK of L9779 or L9680
device.
Figure 7. Power supply connections
C1
100nF/35V
VSYNC
C7
2.2uF/35V
GND
C13
100nF/16V
GND
C9
2.2uF/35V
VCC
C18
100nF/25V
GND
C16
2.2uF/35V
VSAT
TES T
VSYNC
VCC
VSAT
1
2
3
4
J31
11
2
2
J24
GOUTTE CONTACT
GND
near to pin 16
near to pin 44
near to pin 15
bottom layer
bottom layer
bottom layer
near the device
near the device
near the device
near J31
near J31
near J31
bottom layer
bottom layer
bottom layer
CLOSE ONLY ON SOCKETBOARD
Squib power supply connection, VER, is reported in Figure 8.
VER can be connected to VER of L9779 or L9680 device; in order to be able to sustain deployments, the tank
capacitor can be connected closing J3 - J_C_ER on the board, or an external capacitor can be connected through
J2.
In order to reduce the charge current of the tank capacitor, resistor R2 can be inserted (J30 open). S1 switch
allows to discharge the tank capacitor through R1.
UM3145
Supply connections
UM3145 - Rev 1 page 10/23
Figure 8. Squib power supply connections
R2
330/2W
C3
100nF/35V
VER
GND
D2
S1B
C4
4700uF/35V
GND
S_ER R1
100/2W
GND
C11
10nF/35V
GND
SS 01
C12
10nF/35V
SS 67
GND
C14
10nF/35V
GND
C15
10nF/35V
GND
SS 23
SS 45
J3
J_C_ER
J13
J_SS01
J14
J_SS23
J18
J_SS45
J19
J_SS67
near to pin 10
near to pin 4 near to pin 33
near to pin 27
1
2
J1
GND 1
2
J2
CON2
VER
GND
J30
near the device or socket near the device or socket
near the device or socketnear the device or socket
S1
UM3145
Supply connections
UM3145 - Rev 1 page 11/23
6Squib connections
Referring to Figure 9, external squibs have to be connected through J12 (squib0) and the other squib connector
available on the board; J69 has to be left open (the same for the correspondent jumpers of the others channels).
In order to test the deployment having the high side shorted to GND, J6 (squib0) or the correspondent for the
others squibs has to be closed.
Figure 9. Squib connection
C29
22nF/35V
GND
J69
J_SQ0
R28
2
SF0
SR0
C33
22nF/35V
GND
J6
1
2
J12
SF0
SR0
near J12
near J12
UM3145
Squib connections
UM3145 - Rev 1 page 12/23
8Signals exchanged with microcontroller
L9679E board is supposed to work with SPC56P-Discovery board shown in Figure 11, available at st website.
Figure 11. SPC56-Discovery board
Signals exchanged with microcontroller are available on J4 (see Figure 12).
Each signals has to be connected to the correspondent pin of the 4x36 connector available on the microcontroller
board following Error! Reference source not found.: GUI interface drives 4 GPIOs, FENL, FENH, UC_DIAGEN
and UC_DEPEN; these GPIOs can be connected to J4 in order to drive FEN1, FEN2, FENL.
Table 2. SPC56-Discovery, 4x36 connector
SPC56 board pin Signal L9679E J4 pin
Pin # A1 - A36
A1 - -
A2 - -
A3 - -
A4 - -
A5 - -
A6 - -
A7 - -
A8 - -
A9 MCUFAULT -
A10 -
A11 FENL 4
A12 RESET 2
A13 - -
A14 - -
UM3145
Signals exchanged with microcontroller
UM3145 - Rev 1 page 14/23
SPC56 board pin Signal L9679E J4 pin
A15 CS_G 14
A16 MOSI_G 12
A17 - -
A18 - -
A19 - -
A20 - -
A21 - -
A22 - -
A23 - -
A24 - -
A25 - -
A26 - -
A27 - -
A28 - -
A29 - -
A30 - -
A31 - -
A32 - -
A33 - -
A34 - -
A35 - -
A36 - -
Pin #B1 - B36
B1 - -
B2 - -
B3 - -
B4 - -
B5 - -
B6 - -
B7 - -
B8 - -
B9 - -
B10 ACL -
B11 FENH -
B12 - -
B13 - -
B14 - -
B15 SCLK_G 13
B16 MISO_G 11
B17 UC_DIAGEN
B18 - -
UM3145
Signals exchanged with microcontroller
UM3145 - Rev 1 page 15/23
SPC56 board pin Signal L9679E J4 pin
B19 - -
B20 - -
B21 - -
B22 - -
B23 SATSYNC 3
B24 - -
B25 - -
B26 - -
B27 - -
B28 - -
B29 - -
B30 - -
B31 - -
B32 - -
B33 - -
B34 - -
B35 - -
B36 - -
Pin # C1 - C36
C1 - -
C2 - -
C3 - -
C4 - -
C5 - -
C6 - -
C7 - -
C8 - -
C9 - -
C10 - -
C11 - -
C12 - -
C13 - -
C14 - -
C15 - -
C16 UC_DEPEN
C17 FEN2 5
C18 - -
C19 - -
C20 - -
C21 - -
C22 - -
UM3145
Signals exchanged with microcontroller
UM3145 - Rev 1 page 16/23
SPC56 board pin Signal L9679E J4 pin
C23 - -
C24 - -
C25 - -
C26 MOSI_RS 8
C27 - -
C28 - -
C29 - -
C30 - -
C31 - -
C32 - -
C33 - -
C34 - -
C35 - -
C36 - -
Pin # D1 - D36
D1 - -
D2 - -
D3 - -
D4 - -
D5 - -
D6 - -
D7 - -
D8 - -
D9 FEN1 6
D10 - -
D11 - -
D12 - -
D13 - -
D14 - -
D15 - -
D16 - -
D17 - -
D18 - -
D19 - -
D20 - -
D21 CS_RS 10
D22 - -
D23 - -
D24 - -
D25 SCLK_RS 9
D26 MISO_RS 7
UM3145
Signals exchanged with microcontroller
UM3145 - Rev 1 page 17/23
SPC56 board pin Signal L9679E J4 pin
D27 - -
D28 - -
D29 - -
D30 - -
D31 - -
D32 - -
D33 - -
D34 - -
D35 - -
D36 - -
Figure 12. J4 connector for L9679E signals
SCLK_RS
MOS I_RS
MISO_RS
CS_RS
FEN1
FEN2
MOS I_G
CS_G
SCLK_G
MISO_G
SATSYNC
GND
FENL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
J4
CON15
RESET
UM3145
Signals exchanged with microcontroller
UM3145 - Rev 1 page 18/23
Revision history
Table 3. Document revision history
Date Version Changes
03-Mar-2023 1 Initial release.
UM3145
UM3145 - Rev 1 page 19/23
Contents
1Hardware description ..............................................................2
2Board schematics .................................................................4
3Board layout.......................................................................5
4Jumpers and connectors description ..............................................7
5Supply connections ..............................................................10
6Squib connections................................................................12
7RSUx connections ................................................................13
8Signals exchanged with microcontroller ..........................................14
Revision history .......................................................................19
UM3145
Contents
UM3145 - Rev 1 page 20/23
Table of contents
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