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Bosch Semiconductors for Automotive

CG912

Integrated airbag system IC

Application & Technical Summary

CG912

CG912 is essential to realize a compact, dual-chip airbag control unit only consisting of a microcontroller and system IC.

The IC provides four firing loops and two PAS sensor interfaces.


CG912 unites all peripheral system functions of an airbag control unit:

  • Microcontroller, onboard sensors, and energy reserve power supply
  • Digital interfaces for peripheral sensors
  • Safety controller for microcontroller monitoring
  • Airbag deployment firing loops

Product benefits

  • Supports a wide range of microcontroller families
  • ISO-compliant design
  • Chip variants available from for system configurations from entry level to high-end
  • Simple design-in due to software compatibility

Sophisticated safety concept

and extensive diagnostic routines

Technical Features

Type
Integrated airbag system IC
Package
TQFP64_ePad
Features

  • Enhanced sophisticated safety concept: safety controller; 3 watchdogs; ESP sensor data can be included in safety concept
  • Fully automated diagnosis: Monitoring of voltages (incl. VHx) and overtemperature, SVR diagnosis, built-in sensor test, CER diagnosis, power stage and squib diagnosis, cross-coupling diagnosis, connector capacitor diagnosis, STB and STG diagnosis
  • 2 independent 7-bit firing current counters per channel (max time: 3.2 ms)
  • PWM controlled GPIO

Firing loops
4 × 5 firing modes (incl. 1.2 A, 1.75 A and LEA)
Peripheral sensor interfaces
2 x PAS
Analog interfaces
6 × AIN, 2 × AIO
Interfaces
SPI, 32-bit (3.3 V), K-Line/LIN
VDD typ. [V]
3.3
VVAS typ. [V]
6.7
VVZP typ. [V]
14
VVER typ. [V]
23.75 or 33 (programmable)
Tj min [°C]
-40°C
Tj max [°C]
150°C

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