Introduction The EVAL-L9788 is an evaluation board designed to provide the user with a set of info tools for the evaluation of the product L9788, a multifunction IC for automotive engine management system. The board provides all the main input/output capabilities needed to drive all the supported loads and to interface with sensors providing diagnostic functionalities. EVAL-L9788 hardware documentation UM2582 User manual UM2582 - Rev 1 - May 2019 For further information contact your local STMicroelectronics sales office. www.st.com
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IntroductionThe EVAL-L9788 is an evaluation board designed to provide the user with a set of info tools for the evaluation of the productL9788, a multifunction IC for automotive engine management system. The board provides all the main input/output capabilitiesneeded to drive all the supported loads and to interface with sensors providing diagnostic functionalities.
EVAL-L9788 hardware documentation
UM2582
User manual
UM2582 - Rev 1 - May 2019For further information contact your local STMicroelectronics sales office.
The EVAL-L9788 board provides maximum flexibility, giving access to all pins to simplify the evaluation and thedebug phase of the device.
1.1 Block diagram
Figure 1. Application block diagram
PC
GADG2304190933PS
PWM
GPIO
SPI
MicroPower Connectors
ConnectorMicrocontroller
BoardL9788 Demo
Microcontroller
• Standard APG connector 4x36• GPIO/PWM output• Configuration and Diagnostic of L9788 via MSC (Microsecond Channel)• Possibility to easily connect the board to other microcontroller boards through a wire adaptor
UM2582Hardware description
UM2582 - Rev 1 page 2/23
2 L9788 block diagram
Figure 2. L9788 Block diagram
MOSFETPreDriver
IgnitionPredriver
MRD
LSD
LSD
LSD
MSCMicro Second Channel
6
CAN FD
LIN
WatchdogWDA
VRS
Wake Up
Key Off TimerSEO
WK_INENABLE
Regulator
Regulator MonitorDual
Bandgap
DualOscillator
Internal Regulator
Boost RegulatorDriver Buck RegulatorCharge Pump
VPRE
Regulator
Logic
Supply
Power Output
Pre Driver
Interface
2
4
6
42
6
5
5
5
3
3
4
CPRESET RSTN
BIST
GADG2411160929PS
VSENSE3VSENSE2VSENSE1
AD_TEST
VSENSE4_MON
KEY_IN
SEO_OUT
VB_STDBY
FLW_IN_NFLW_OUT
FLW_IN_P
RSTCVDD_IO
MSC_EN, MSC_DOMSC_DI_P,N
MSC_CK_P,N
GND_CANVB_CAN
VDD_CANCAN_LCAN_H
CAN_RXCAN_TX
LIN_RXLIN_TX
ISO11898-2
LIN/K-Line
Q & A WD_RST
2 x 6A
2 x 70mALSD (LED)
6 x 2.2A
6 x
5 x5 x
HSD/LSD0.6A3 x
3 Pins TestMode(PowerGND)
GND1
PDR_GND
PRDN1,2,3,4,5_DRN
PRDN1,2,3,4,5_Gate
MRD
STR1,2,3_SRC
STR1,2,3_DRN
EN_NEN_P
IGN1,2,3,4,5,6
INJ_ENA
CURR_Sense_O2H1,2O2HxPGND
O2HxxA,O2HxxB
SOL1..2INJ1..4
INJx_PGNDSOL12_PGND
LED1/2
5 x 0.6A
VDD5_IN
VDD5_GateVDD5
RLY1..5
WD_RSTVDD5_UVVcore_UV3 x Tracking
1 x ext Tracking
BUCK_C_BST
VB_IN BUCK_SWVB_IN_SWCPBOOST_GVBAT_Sense
UM2582L9788 block diagram
UM2582 - Rev 1 page 3/23
3 L9788 pinout and pin description
Figure 3. Pinout diagram
GADG2411160940PS
1
2
3
5
6
4
7
8
9
10
45
11
46 47 48 49 50
86 85 84 83 8182 80 79 78 77 76
70
69
68
66
65
67
75
74
73
71
72
LIN
LIN_RX
LIN_TX
FLW_IN_N
FLW_IN_P
FLW_OUT
MRD
WK_IN
KEY_IN
VB_STBY
VSENSE4_MONR
LY3
RLY
4
RLY
5
IGN
3
MSC
_EN
IGN
4
MSC
_CK_
P
MSC
_CK_
N
MSC
_DI_
P
MSC
_DI_
N
GN
D1
O2H
2A
O2H
2B
O2H
2_PG
ND
B
CU
RR
_Sen
se_O
2H2
Buck
_SW
VB_I
N_S
W
Buck
_C_B
ST
CP
VB_I
N
VBAT
_Sen
se
Boos
t_G
PDR_GND
VPRE
VSENSE1
VSENSE3
SOL1
VSENSE2
GND
RSTC
VDD5_GATE
AD_TEST
VDD5_IN
40 41 42 43 44
97 96 95 94 9293 91 90 89 88 87
GN
D
CAN
_RX
CAN
L
CAN
H
VDD
_CAN
CU
RR
_Sen
se_O
2H1
O2H
1_PG
ND
A
O2H
1A
O2H
1B
O2H
1_PG
ND
B
O2H
2_PG
ND
A
100 99 98
GN
D_C
AN
VB_C
AN
CAN
_TX
34 35 36 37 38 39
INJ_
ENA
EN_N
EN_P
IGN
1
RLY
1
IGN
2
RLY
2
INJ1
INJ1
_PG
ND
INJ2
_PG
ND
INJ2
29 30 31 32 33
SEO
_OU
T
VDD
_IO
MSC
_DO
26 27 28
12
13
14
16
17
15
18
19
20
21
22
59
58
57
55
54
56
64
63
62
60
61
STR2_SRC
STR1_SRC
STR1_DRN
INJ34_PGND
INJ3
INJ4
LED2
LED1
STR3_SRC
STR2_DRN
STR3_DRN
PRD1_GATE
PRD3_GATE
PRD3_DRN
PRD2_GATE
PRD4_GATE
PRD2_DRN
SOL12_PGND
SOL2
IGN5
PRD1_DRN
IGN6
23
24
25
52
51
53
RSTN
WDA
GND
PRD5_DRN
PRD5_GATE
PRD4_DRN
Table 1. Pin descriptions
Pin Number Name Function
1 FLW_IN_P Flying wheel inputs voltage positive
2 FLW_IN_N Flying wheel inputs voltage negative
3 FLW_OUT Flying wheel output voltage
4 LIN_TX LIN data input
5 LIN_RX LIN data output
6 LIN LIN driver output
UM2582L9788 pinout and pin description
UM2582 - Rev 1 page 4/23
Pin Number Name Function
7 VB_STBY Standby function supply voltage
8 VSENSE4_MON Tracking sensor supply monitor
9 KEY_IN Key signal input
10 WAKE_IN wake up signal input
11 MRD Main relay drivers outpour voltage
12 INJ3 Injector Driver output voltage
13 INJ34_PGND Ground
14 INJ4 Injector Driver output voltage
15 STR1_DRN Configurable high/low side drain voltage
16 STR1_SRC Configurable high/low side source voltage
17 STR2_SRC Configurable high/low side source voltage
18 STR2_DRN Configurable high/low side drain voltage
19 STR3_DRN Configurable high/low side drain voltage
20 STR3_SRC Configurable high/low side source voltage
21 LED1 LED Driver output voltage
22 LED2 LED Driver output voltage
23 GND Ground
24 WDA Watchdog output
25 RSTN Reset output for VDD5
26 SEO_OUT SEO output pin
27 VDD_IO Dedicated supply for FLW_OUT, MSC_DO,LIN_RX, CAN_RX
28 MSC_DO MSC digital I/O vloltage
29 INJ_ENA Enable pin for injector driverPower
30 EN_N enable signals
31 EN_P enable signals
32 IGN1 Ignition pre-driver output voltage
33 IGN2 Ignition pre-driver output voltage
34 RLY1 Relay Driver output voltage
35 RLY2 Relay Driver output voltage
36 INJ1 Injector Driver output voltage
37 INJ1_PGND Ground
38 INJ2_PGND Ground
39 INJ2 Injector Driver output voltage
40 RLY3 Relay Driver output voltage
41 RLY4 Relay Driver output voltage
42 RLY5 Relay Driver output voltage
43 IGN3 Ignition pre-driver output voltage
44 IGN4 Ignition pre-driver output voltage
45 MSC_EN MSC digital I/O voltage
46 MSC_CK_P MSC digital I/O voltage
UM2582L9788 pinout and pin description
UM2582 - Rev 1 page 5/23
Pin Number Name Function
47 MSC_CK_N MSC digital I/O voltage
48 MSC_DI_P MSC digital I/O voltage
49 MSC_DI_N MSC digital I/O voltage
50 GND1 Power ground
51 PRD5_GATE General purpose pre-drivers gate voltage
52 PRD5_DRN General purpose pre-drivers feedback voltage
53 PRD4_DRN General purpose pre-drivers feedback voltage
54 PRD4_GATE General purpose pre-drivers gate voltage
55 PRD2_GATE General purpose pre-drivers gate voltage
56 PRD2_DRN General purpose pre-drivers feedback voltage
57 PRD3_DRN General purpose pre-drivers feedback voltage
58 PRD3_GATE General purpose pre-drivers gate voltage
59 PRD1_GATE General purpose pre-drivers gate voltage
60 PRD1_DRN General purpose pre-drivers feedback voltage
61 IGN6 Ignition pre-driver output voltage
62 IGN5 Ignition pre-driver output voltage
63 SOL2 Valve Driver output voltage
64 SOL12_PGND Ground
65 SOL1 Valve Driver output voltage
66 VSENSE3 5 V tracking sensor supply output voltage
67 VSENSE2 5 V tracking sensor supply output voltage
JP13 VDD_CAN connected to 5V, CAN transceiver is powered Closed
JP14 CAN interface digital input level 5V interface 1-2
JP15 CAN transceiver is enabled Closed
JP16 CAN_TX TX is connected to the microcontroller connector (J15) Closed
JP17 CAN_RX TX is connected to the microcontroller connector (J15) Closed
JP18 LIN configured as master 1-2
JP19 LIN_TX is connected to the microcontroller connector (J15) Closed
JP20 LIN_RX is connected to the microcontroller connector (J15) Closed
JP21 Flywheel sensor Magnetic reluctance sensor positive input 1-2
JP22 Flywheel sensor Magnetic reluctance sensor negative input 1-2
JP23 CAN ground connected to ground Closed
JP24 VPRE correctly connected to BUCK output Closed
S1 Key-In switch ON: KEY-IN asserted OFF: KEY-IN notasserted
5.3 Getting started
5.3.1 Start up1. Configure all the jumper according to Table 3. Jumpers configuration;2. Connect a Power supply to JP1 respecting the right polarity;3. Configure the power supply connected to J1 to 13.5 V ;4. Switch on the power supply;5. Switch ON S1 (Key-in) to enable the device;6. For further information connect a µC and follow the related documentation to check the internal register
status of L9788.
UM2582Default jumpers setting
UM2582 - Rev 1 page 15/23
Appendix A L9788 Evaluation board schematics
Figure 8. EVAL-L9788 regulators schematic diagram
VB_IN78
Boost_G76
VBAT_SENSE77
VSENSE3 66
VSENSE1 68
VSENSE2 67V
B_I
N_S
W82
TAB
_GN
DTA
B
KEY_IN9
WAKE_IN10
VB_STBY7
VPRE 69
BUCK_SW 81
BUCK_C_BST 80
VDD5_IN 72
VDD5_GATE 73
CP79
VSENSE4_MON8
MRD11
U1AL9788
C18
10uF
GND
C25
0.47uF
C26
0.47uF
C27
0.47uF
GND GND GND
VTRK1
VTRK2
VTRK3
VDD5TP5VDD5
TP9VTRK1
TP11VTRK2
TP13VTRK3
L2
22uHD4
STPS3L60C8
10uF
C7
47nF
GND GND
C9
10uF
VPRETP3VPRE
C6
100nF
C4
10uF
GND
C1
10uF
C2
10uF
C3
10uF
L1 10uHD2STPS3L60
R52R2R6
150K / 100K
GND R7
22K
R12100K
R9 1K
C21
100nF
GND GND
D1STTH4R02
R10 1K
R13100K
GND
C22
100nF
GND
C23
100nF
GND
GND
VBAT
12
J1
PWR SUPPLY
VBATGND
R20R
D3TVS
GND
1234
J2
Regulators
VDD5VTRK1VTRK2VTRK3
VDD5_GATE
VDD5_GATE
VPRE
VDD5
C20
4.7nF
GND
MRD
KEY_INWAKE_IN
VB_STBY_EXT
JP1
WAKE_IN
VBAT
KEY_IN
WAKE_IN
MRD
VB_STBY_EXT
VTRK_EXT_MON
12345
J3
KEY_WAKE
VTRK_EXT_MON
TP6KEY_IN
TP7WAKE_IN
TP8MRD
TP10VB_STBY
TP12VTRK_EXT_MON
TP4Boost_G
TP2VB_IN
TP1VBAT
D5TVS
TPSMB36A
TPSMB15AHE3
C5
100nF
C10
100nF
JP2
VB_STBY
R11 0
GND
R1
R3
C12
C14
100nF
GND
R4
C13
C15
100nF
GND
C17
GND
C19
GND
C16
100nF
GND
R8 0
C24
100nF
GND
S1KEY_IN
D7 KEY
D8 WAKE
KEY_IN
GND
D6 VBVBAT
WAKE_IN
D9 VDD5VDD5
R14
4K7
R15
4K7
R16
4K7
R17
2K2
1. R1, R3, C12, C13, R4, C17, C19 , reversefootprint, not mounted at default2. D2, D4 -> modify SMC footprint tocompatible with SMB size3. L1, L2 -> footprint will be compatible with10.7*10 also 7.3*6.8 size inductor.4. VDD5 Ext. MOS-> BUK9Y40 is mounted atdefault, D2PAK/DAPK package is reserved.
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