An occupant protection device controller includes a main sensor, a safing
sensor, a main control circuit, a sub control circuit, and a trigger
signal output circuit. Whereas the main control circuit has a CPU, and
the sub control circuit has no CPU. The main control circuit determines
whether to output a main control signal based on both an output of the
main sensor and an output of the safing sensor. The sub control circuit
has a comparator and determines whether to output a sub control signal
based on a comparison of the output of the main sensor with a threshold
value. The trigger signal output circuit outputs a trigger signal for
activating an occupant protection device upon receipt of both the main
control signal and the sub control signal.