ST MB467 User manual

STMicroelectronics
MB467
Airbag EVA Board
UM0178
User manual
Rev 1
February 2006
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Rev 1
February 2006 1/37
1
UM0178
USER MANUAL
MB467
Airbag Eva Board
Introduction
The MB467 Airbag Eva Board is a complete demonstrator of an airbag system based on
STMicroelectronics devices. The board implements a flexible and open design demonstrating
the capability of the STMicroelectronics 16/32bit microcontrollers and safing devices for airbag
applications.
The MB467 Airbag Eva Board mounts two safing devices with SQUIB drivers and satellite
sensor interfaces L9654 and L9658 plus a safety power regulator L4998.
The board has opened connectivity to ST CPU boards, SQUIBs and to external power supply.
A prototyping area allows users to do needed specific circuit.
Main components
●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
●Standardized CPU board connector providing access to off board I/O, PWM, SPI and
power supply
●Connector for Squibs
●Connector for Satellites
●Connector for Hall Sensors
Features
●Support the ST30F7xx and ST10F3xx EVA boards
●Support for up to 6 satellites or 4 satellites and 2 Hall sensors, real or simulated
●Support for up to 12 Squibs, real or simulated
●Diagnostic testing and validation of safing functionality
– SPI arming and deployment
– Squibs and deployment drivers
– Loss of ground and short circuit
– Micro/satellites communication
●On board standard 100 mils prototyping area
●Main power supply 12V
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Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Board connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Before you start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Jumper settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Using the board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1 How to exercise diagnostic functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.1 Arming interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.2 Squibs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.3 Deployment drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.1.4 Satellites communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 L9658 octal squib driver and quad sensor interface ASIC . . . . . . . . . . . . . . .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 Satellite SPI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5.4 Board satellite functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.6 Arming interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6.1 Arming SPI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6.2 ASIC diagnostic functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7 Squib and deployment drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7.2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.7.3 Board functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8 Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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4.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.10 CPU Board connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.11 Prototyping 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
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List of tables
Table 1. Satellite connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 2. Satellite jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 3. Arming interface jumpers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 4. Deployment Enable jumpers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 5. Squib connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 6. Squib 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. Connectors summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 13. Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
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List of figures
Figure 1. The MB467 Airbag Eva Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. MB467 Airbag Eva Board layout block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 3. MB467 Airbag Eva Board system block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4. Satellite jumpers location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 5. SPI configuration on Arming for eva board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 6. Arming SPI daisy-chain configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 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 Squib Driver and Quad Sensor Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 13. L9654 Quad Squib Driver and Dual Sensor Interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 14. Connector to CPU board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
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1 Introduction UM0178
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1 Introduction
The MB467 Airbag Eva Board is intended as a low cost development platform to demonstrate
the capability of the L9658/L9654 safing and L4998 voltage regulator ASIC’s. The board
includes also a CPU board connector to interface with ST10/ST30 EVA board.
Main functionality includes deployment of airbags, switched-power sources to satellite sensors,
diagnostic of 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 CPU board connector
●Full access to diagnostic functionality of the safing ASIC:
– SPI arming and deployment
–Squibs
– Deployment drivers
– Satellites communication
Figure 1. The MB467 Airbag Eva Board
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1.2 Devices
The MB467 Airbag Eva Board mounts the following devices:
●L9658 octal squib driver and quad sensor interface ASIC for safety application
– 64-pin TQFP version
– 8 deployment drivers
– interface with 4 satellite sensors
– support Manchester protocol for satellite sensors
– supports for variable bit rate detection
– SPI interface
– Hall effect sensor support on satellite channels 3 and 4
●L9654 quad squib driver and dual sensor interface ASIC for safety application
– 48-pin TQFP version
– 4 deployment drivers
– interface with 2 satellite sensor
– support Manchester protocol for satellite sensor
– supports for variable bit rate detection
– SPI interface.
●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 regulator (Vcc) able of sourcing up to 200 mA output current
– current limit and thermal shutdown protection
1.3 Board connections
The board provides the connections listed below:
●CPU board Connector to microcontroller I/O, PWM, SPI and power supply
●Connectors for 6 satellites or 4 satellites and 2 Hall sensors, real or simulated
●Connectors for 12 squibs, real or simulated
●On board standard 100 mils prototyping area
●Main power supply 12V
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2 Before you start UM0178
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2 Before you start
This section describes operations needed before powering up the board.
Please, refer to Chapter 4 on page 10 for detailed information on board configuration and
jumper settings.
2.1 Jumper settings
For the location and (default) settings of the various jumpers, please refer as follows:
1. Close the jumper J51 to supply the board.
2. Close jumpers J48-J50 to supply VCC.
3. Close jumpers J23-J25 to supply 35V Vboost to the board.
4. Close jumpers J31-J33, J40-J41 and J43-J44 to supply 8V Vbuck to the board
5. Close the jumper J46 to supply a soft start function to SPR internal regulator (Cslew).
6. Close jumpers J22, J26-J30, J34-J35, J37-J39, J42 and J45. These jumpers are only for
testing purpose and must always be closed.
7. Close the jumper J36 to pull up the RST signal at power on.
8. Close the jumper J14 to provide the clock signal to the Satellite/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 CPU
board connector.
10. Connect satellites for L9654 to pin 1 of jumpers J54-J55. If you want to simulate them,
close jumpers J54-J55 and provide the appropriate signals to the DICH5-DICH6 pins on
the CPU board connector.
11. Close the jumper J15 to enable deployment on L9654.
12. Close the jumper J21 to enable deployment on L9658.
13. Close the jumper J20 to provide the clock signal to the Arming interface.
14. Close the jumpers J13, J16, J17, J18, J19 to enable the squibs.
15. Connect squibs to connectors TP1, TP2 and TP7. If you want to simulate squib loads
instead of connecting them, close jumpers J1-J4, J9-J12, J52-J53 and J56-J57.
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