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UM0178

4 Hardware

23/37

4.9 Reset

Power on reset is driven by the L4998 Safety Power Regulator (SPR). The SPR provides an
output (RST) to indicate the regulation status of VCC. The RST output is asserted low
whenever VCC falls below its low voltage threshold or VCC rises above its over-voltage
threshold.

The RST signal is connected to the RESETB pin of the two safing ASIC’s and to the RESETIN
pin of the CPU Board Connector. When this signal is asserted low, all components in the board
and any connected microcontroller board will be reset.

Please, note that during a deployment, the L9658/L9654 ignores but latches internally the reset
signal. Only after the deployment is complete, the reset signal is asserted, any output operation
interrupted and the ASIC internal registers reset to their default state.

RESETB signal of the two ASIC can be forced high (pull up), regardless of the RST signal
coming from the SPR, through jumper J36.

Table 9.

Reset jumper

Figure 9.

Power supply jumpers location

Name

Figure

Description

J36

Figure 10

Force pull up of the RESETB signal

J29

J26

J22

J23-25

J28

J35

J42

J34

J38
J39

J30

J37

J27

J51

J45

J46

J48-50

J40

J31-33

J41

J43
J44

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Содержание MB467

Страница 1: ...STMicroelectronics MB467 Airbag EVA Board UM0178 User manual Rev 1 February 2006 Downloaded from Arrow com...

Страница 2: ...BLANK Downloaded from Arrow com Downloaded from Arrow com...

Страница 3: ...mponents L9658 octal squib driver and quad sensor interface ASIC for safety application L9654 quad squib driver and dual sensor interface ASIC for safety application L4998 Safety Power Regulator Stand...

Страница 4: ...SIC 11 4 3 L9654 quad squib driver and dual sensor interface ASIC 12 4 4 L4998 Safety Power Regulator ASIC 13 4 5 Satellite Sensor interface 13 4 5 1 Features 13 4 5 2 Functional description 13 4 5 3...

Страница 5: ...area 25 4 12 Jumpers summary 25 4 13 Connectors summary 28 5 Revision history 30 Appendix A Bill of materials 31 Appendix B Schematics 33 Downloaded from Arrow com Downloaded from Arrow com Downloade...

Страница 6: ...dummy loads 20 Table 7 Power supply jumpers 22 Table 8 Power supply jumpers testing only 22 Table 9 Reset jumper 23 Table 10 CPU Board connector pinout 24 Table 11 Jumpers summary 25 Table 12 Connect...

Страница 7: ...re 7 Arming jumpers location 18 Figure 8 Squib jumpers location 21 Figure 9 Power supply jumpers location 23 Figure 10 Reset jumper 24 Figure 11 L4998 Safety Power Regulator 33 Figure 12 L9658 Octal S...

Страница 8: ...f sensing deployment module and arming inputs 1 1 Features General features of this board are Complete airbag evaluation system Full compatibility with other microcontroller boards designed for the CP...

Страница 9: ...rface L4998 Safety Power Regulator boost regulator able of sourcing up to 90 mA buck regulator operating in Continuous Conduction Mode able of sourcing up to 250mA output current one 5 0 V linear regu...

Страница 10: ...lite Deployment interface 9 Connect satellites for L9658 to pin 1 of jumpers J5 J8 If you want to simulate them close jumpers J5 J8 and provide the appropriate signals to the DICH1 DICH4 pins on the C...

Страница 11: ...ment drivers The whole logic of the two ASIC can be exercised without firing the squib by keeping low the DEPEN signal of the relative ASIC This can be done by opening the jumper J21 for L9658 or jump...

Страница 12: ...rd layout block diagram SQUIB L9654 POWER L9654 CPU BOARD SQUIB L9658 PROTOTYPE AREA L4998 CONNECTOR L9658 Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from...

Страница 13: ...n for 1ms min Independently controlled high side and low side MOS for diagnosis Analog output available for resistance Squib short to ground short to battery and MOS diagnostic available on SPI regist...

Страница 14: ...d 1 75A min for 1ms min Independently controlled high side and low side MOS for diagnosis Analog output available for resistance Squib short to ground short to battery and MOS diagnostic available on...

Страница 15: ...etection Independent current limit and fault timer shutdown protection for each satellite output Short to ground and short to battery detection and reporting for each satellite channel 5 5MHz SPI inte...

Страница 16: ...ible drive the two satellite interfaces L9658 L9654 separately because there are two chip select CS_S1 and CS_S2 4 5 4 Board satellite functionality Satellites can be connected directly to the ASIC s...

Страница 17: ...Satellite and Deployment J5 Figure 4 Enable load simulation for L9658 satellite channel 1 through DICH1 J6 Figure 4 Enable load simulation for L9658 satellite channel 2 through DICH2 J7 Figure 4 Enabl...

Страница 18: ...the system evaluation board where ASIC s are sharing a common SPI Diagnostic functionality of the arming interface can be tested using jumper J20 Opening this jumper interrupts the SCLK_A signal of t...

Страница 19: ...oard connector DEPEN2 can also be manually forced low by opening the jumper J15 L9658 L9654 are able to perform a short to battery a short to ground a resistance measurement and a MOS diagnostics on t...

Страница 20: ...7 1 Features 8 deployment drivers sized to deliver 1 2A min for 2ms min and 1 75A min for 1ms min Independently controlled high side and low side MOS for diagnosis Analog output available for resistan...

Страница 21: ...e Driver Output for Channel 2 for L9658 SQH3 Figure 8 High Side Driver Output for Channel 3 for L9658 SQH4 Figure 8 High Side Driver Output for Channel 4 for L9658 SQH5 Figure 8 High Side Driver Outpu...

Страница 22: ...wer Ground for Loop Channel 3 for L9654 Name Figure Description J1 Figure 8 Driver Output for Channel 0 for L9658 J2 Figure 8 Driver Output for Channel 1 for L9658 J3 Figure 8 Driver Output for Channe...

Страница 23: ...8 Power Ground for Loop Channel 0 for L9654 J17 Figure 8 Power Ground for Loop Channel 1 for L9654 J18 Figure 8 Power Ground for Loop Channel 2 for L9654 J19 Figure 8 Power Ground for Loop Channel 3 f...

Страница 24: ...9 Power supply switch J48 J50 Figure 9 VCC partitioning J23 J25 Figure 9 Vboost partitioning J31 J33 J40 J41 J43 J44 Figure 9 Vbuck partitioning Name Figure Description J22 J26 J30 J34 J35 J37 J39 J4...

Страница 25: ...TB signal of the two ASIC can be forced high pull up regardless of the RST signal coming from the SPR through jumper J36 Table 9 Reset jumper Figure 9 Power supply jumpers location Name Figure Descrip...

Страница 26: ...c for L9658 B 15 SCLK Satellite Deployment SPI Clock B 16 MISO Satellite Deployment SPI Data Output B 18 DICH4 Channel 4 Satellite Sensor input simulation for L9658 B 23 DICH6 Channel 2 Satellite inpu...

Страница 27: ...ng Interface of L9658 Jumper Name Figure Description J1 SQUIB Figure 8 Driver Output for Channel 0 for L9658 J2 SQUIB Figure 8 Driver Output for Channel 1 for L9658 J3 SQUIB Figure 8 Driver Output for...

Страница 28: ...J22 Vboost Figure 9 Vboost partitioning for testing J23 J25 Vboost Figure 9 Vboost partitioning J26 J30 Vboost Figure 9 Vboost partitioning for testing J31 Vbuck Figure 9 Vbuck partitioning J32 Vbuck...

Страница 29: ...r Channel 3 for L9654 J57 SQUIB Figure 8 Driver Output for Channel 4 for L9654 Jumper Name Figure Description Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded f...

Страница 30: ...9658 SQL7 Figure 8 Low Side Driver Output for Channel 7 for L9658 SQL9 Figure 8 Low Side Driver Output for Channel 0 for L9654 SQL10 Figure 8 Low Side Driver Output for Channel 1 for L9654 SQL11 Figur...

Страница 31: ...d from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com D...

Страница 32: ...loaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow...

Страница 33: ...J20 J21 J22 J23 J24 J25 J26 J27 J28 J29 J30 J31 J32 J33 J34 J35 J36 J 37 J38 J39 J40 J41 J42 J43 J44 J45 J46 J47 J48 J49 J50 J51 J52 J5 3 J54 J55 J56 J57 J13 JUMPER_2 24 J13 JUMPER_x8 25 L1 22uH 26 L...

Страница 34: ...nloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow...

Страница 35: ...D4 S2B D4 S2B 1 2 R33 12 4K R33 12 4K 1 2 C40 47MF C40 47MF 1 2 C38 220MF C38 220MF 1 2 C42 100nF C42 100nF 1 2 J48 1 2 C44 100nF C44 100nF 1 2 J23 J23 1 2 J28 J28 1 2 J46 TP4 TP4 1 2 D3 MBRS1100T3 D...

Страница 36: ...0pF 3 1 2 R12 2K R12 2K 1 2 R28 4 7K R28 4 7K 1 2 C5 100nF C5 100nF 1 2 C13 100nF C13 100nF 3 1 2 R20 2K R20 2K 1 2 R2 2 R2 2 1 2 R17 10K R17 10K 1 2 R7 10K R7 10K 1 2 R11 10K R11 10K TP3 TP3 MSG 1 MI...

Страница 37: ...8 CS_D 9 DEPEN 10 MOSI 11 NC 12 NC 13 MOSI_A 14 SCLK_A 15 SCLK 16 GND2 17 SQL2 18 SQH2 19 VRES2 20 VRES3 21 SQH3 22 SQL3 23 GND3 24 NC 36 AOUT 35 AOUT_GND 34 IREF 33 NC 32 ICH1 31 NC 30 ICH2 29 NC 28...

Страница 38: ...4 D25 D26 D27 D28 D29 D30 D31 D32 C33 C34 D33 D34 X2 Header 2x34 CD X2 Header 2x34 CD 1 2 J14 J14 1 2 R29 0 1 2 J17 1 2 J18 Downloaded from Arrow com Downloaded from Arrow com Downloaded from Arrow co...

Страница 39: ...R MALFUNCTION MAY RESULT IN PERSONAL INJURY DEATH OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE Resale of ST products with provisions different from the statements and or technical features set forth in...

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