Safety

E981.18 | 8-Channel Squib Driver

Description

The Four Channel Squib Driver ASSP E981.17 is designed specifically for automotive airbag applications. The IC provides individual control and diagnostics for 4 floating squibs. It has two sources of control, an arming sensor signal and a μC signal via the SPI bus. An active signal at the arming sensor input will activate all selected drivers, which have been enabled by the μC. During firing the squibs, the input voltage of the high side switch is limited to 25V for LCM and 35V in HCM by the system. In order to limit the power dissipation of the driver stages, internal firing limitation counters (FTL) are implemented for each high side driver. Additionally an over voltage detection for all 4 LSD (VTxL) output voltages is provided to avoid a damage of the drivers in case of a short to battery during firing and during driver test in application.

Features

  • Two squib current modes (LCM and HCM) selectable via SPI commands
  • Simultaneously firing of 4 loops possible
  • Squib channel diagnostics and monitoring
  • Autarky voltage & squib supply voltage diagnostics
  • Separate low side and high side driver control
  • Serial interface (SPI synchronous communication) to μC (3.3V and 5V tolerant inputs)

Applications

  • Squib driver in a Restraint Diagnostic and control Module (RDM)

Ordering Information

  • Samples
    Part No.Temp. RangePackageOrder No.
    E981.18-40°C to +95°CQFN44L7E98118A39B

     

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Application Diagram

8-Channel Squib Driver

Documentation