The L9678P IC is a system chip solution targeted for emerging market applications. Base system designs can be completed with the L9678P, SPC560Px microcontroller and an on-board acceleration sensor or PSI5 sensor.
Energy reserve voltage is derived through a cost effective high frequency boost regulator. High frequency operation allows the user to pick up low value and cheap inductance. The voltage is programmable to 23 V or 33 V nominal.
Battery voltage is sensed through the VBATMON pin providing start-up and shutdown control for the system. Once battery voltage drops below the minimum operating voltage, the device enables the integrated crossover switch to permit orderly shutdown.
L9678P offers two linear regulators (5 V with external pass transistor and fully integrated 3.3 V). User can use one of these regulators to supply μC. Input/output pins are compatible with both ranges by dedicated supply pin VDDQ. External pass transistor gives the flexibility to easily address different current loads in case of different micro-controllers.
One optional 7.2 V linear regulator with external pass transistor can be used to supply remote sensor interface.
External acceleration data is received through the PSI-5 remote sensor interface. Both channels have independent decoders. Sensor data and diagnostics are available via SPI.
The safing logic monitors inertial sensors (remote sensors via PSI-5 or on-board sensors via SPI) to determine if a crash event is in progress, thereby enabling deployment to occur. Parameters for sensor configuration and thresholds are user programmable.
Squib deployment uses four independent high and low side drivers, capable of deploying at 25 V max. Diagnostic data control is provided through the SPI interface.
The Hall-effect, resistive or switch sensor interface can be used to determine the state of external switch devices, such as buckle switches, seat track position sensors, weight sensors, deactivation switches.
The integrated clock module provides a fixed clock signal for the microcontroller. The clock module provides the user the option of deleting the commonly used resonator or crystal.
Energy reserve voltage power supply
High frequency boost regulator, 1.882 MHz
Output voltage user selectable, 23 V or 33 V ±5%
User configurable linear power supplies
5.0 V and 7.2 V ±4% output voltages
External pass transistor
Fully integrated 3.3 V ±4% linear regulator
Battery voltage monitor and shutdown control with wake-up control
System voltage diagnostics with integrated ADC
Crossover performance, max 3 Ω, 600 mA max.
Squib deployment drivers
4 channel HSD/LSD
25 V maximum deployment voltage
1.2 A @ 2 ms and 1.75 A @ 0.5/0.7 ms deployment profiles
Integrated safing FET linear regulator, 20 V/25 V nominal
Rmeasure, STB, STG and leakage diagnostics
High and low side driver FET tests
Safing FET test
User customizable safing logic
Two channel PSI-5 remote sensor interface (asynchronous mode), [only for L9678P-S version]
Four channel hall-effect, resistive or switch sensor interface
Dual channel configurable high-side/low-side LED driver