L9965P-FN datasheet(2/104 Pages) STMICROELECTRONICS

2 / 104 page

The digital input triggers are compatible with both level and PWM encoding, supporting 16 kHz and 125 kHz

encoded signals.

The device supports the charging of an external capacitor to be used as tank capacitor or as energy reserve (ER)

in case of battery loss. An internal boost regulator can be used to control the ER cap voltage around a

programmable setpoint. Boosting the input battery voltage allows using smaller ER capacitor values to store the

energy needed for firing, even in case of ECU battery loss.

The device has been designed to deliver maximum safety and performance while still being energy efficient. A

low-power operation strategy allows minimizing the idle consumption, keeping the device in an ultra low power

state while still performing all the diagnostic sweeps needed for achieving the ASIL targets. The periodicity of the

diagnostic sweeps can be programmed in order to comply with any FTTI. During such ultra low power state, the

device is still sensitive to wake-up/trigger sources in order to be ready to fire.

Operation in conjunction with L9965C companion chip allows simplifying the software development, as many

safety mechanisms are already implemented by L9965C.

L9965P

DS14702 - Rev 4

page 2/104

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