Abstract The airbag squib drivers operate with multiple supply voltage (MSV ) levels, viz. the LV, MV and HV rails. Our goal is to ensure that there is no inadvertent activation of the drivers that will lead to the activation of the HS_FET and LS_FET. In addition to this inadvertent activation, diagnostic circuits for measuring the squib resistance are required. In this chapter, a robust biasing scheme that prevents inadvertent activation of the powerFETs, high currents triggered by tri-stated circuits, too high output voltage on the output buffer with a voltage and current selector biasing scheme is presented. In addition to the biasing scheme, the design of a bidirectional fault-tolerant current limited voltage source (CLVS ) that is mandatory for the squib resistance measurement is presented. Bidirectional fault-tolerant CLVS indicates both short to battery and short to ground and can be present simultaneously.


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