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L9679P Datasheet(PDF) 12 Page - STMicroelectronics

Part # L9679P
Description  Automotive advanced airbag for mid/high end applications and cut-off battery IC
PDF  279 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9679P Datasheet(HTML) 12 Page - STMicroelectronics

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L9679P
12/279
DS11627 Rev 7
Figure 47. DC sensor interface block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Figure 48. Passenger inhibit logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Figure 49. Top level safing engine flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Figure 50. Safing engine – 32-bit message decoding flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192
Figure 51. Safing engine – 16-bit Message decoding flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193
Figure 52. Safing engine - Validate data flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Figure 53. Safing engine - Combine function flow chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Figure 54. Safing engine threshold comparison . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Figure 55. Safing engine - Compare complete . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Figure 56. In-frame example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Figure 57. Out-of-frame example. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Figure 58. Safing engine arming flow diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202
Figure 59. Safing engine diagnostic logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Figure 60. ARMx input/output control logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204
Figure 61. Pulse stretch timer example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Figure 62. Scrap SEED-KEY state diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Figure 63. Scrap ACL state diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
Figure 64. Disposal PWM signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Figure 65. GPO driver and diagnostic block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Figure 66. GPO Over temperature logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Figure 67. ISO9141 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Figure 68. ADC MUX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
Figure 69. ADC conversion time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Figure 70. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Figure 71. SPI timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
Figure 72. Deployment drivers diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249
Figure 73. TQFP100 (14x14x1.4 mm exp. pad down) package outline. . . . . . . . . . . . . . . . . . . . . . . 274



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