L9680 | 产品 - 意法半导体

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产品概要

描述

The L9680 is a chip that can be used in advanced airbag systems for mature airbag markets or in cut-off battery systems for integrated safety markets. This device is family compatible with the L9678 and L9679 devices. Safety system integration is enabled through higher power supply currents and integrated active wheel speed sensor interface. The active wheel speed interface is shared with the PSI-5 satellite interface to create a generic remote safety sensor interface compliant to both systems.

High frequency power supply design allows further cost reduction by using smaller and less expensive external components. All switching regulators operate at 1.882 MHz while buck converters have integrated synchronous rectifiers.

Additional attention is given to system integrity and diagnostics. The ER capacitor is electrically isolated from the boost regulator by a fixed charge current circuit to control in-rush current. An additional discharge current circuit is integrated in the IC to measure the capacitance and the ESR of ER capacitor. The same current sources can be used to discharge the capacitor at shutdown.

Thanks to low quiescent current, the device can be directly connected to battery. In this way, the device start-up and shutdown are controlled through the wake-up input function. The power supply and crossover function are controlled automatically through the internal state machine.

The user can select both ECU logic voltage (V_CC at 3.3 V or 5.0 V) and energy reserve output voltage (at either 23 V or 33 V). Deployment voltage is set to a maximum of 25 V for all profiles and can be controlled through external safing switch circuit using the high-side safing switch reference enabled through the system SPI interface or the arming logic.

性能一览
AEC-Q100 qualified

Boost regulator for energy reserve

1.882 MHz operation, I_load = 70 mA max

Output voltage user selectable, 23 V/ 33 V ±5%

Capacitor value & ESR diagnostics

Boost regulator for PSI-5 SYNC pulse

1.882 MHz operation,

Output voltage, 12 V/14.75 V, user configurable

Buck regulator for remote sensor

1.882 MHz operation

Output voltage, 7.2 V/9 V ±4%, user configurable

Buck regulator for micro controller unit

1.882 MHz operation

Output voltage user selectable, 3.3 V or 5.0 V ±3%

Integrated energy reserve crossover switch

3 Ω - 912 mA max

Switch active output indicator

Battery voltage monitor & shutdown control with Wake-up control

System voltage diagnostics with integrated ADC

Squib/pyroswitch deployment drivers

12-channel HSD/LSD

25 V max deployment voltage

Various deployment profiles

Current monitoring

R_measure, STB, STG & Leakage diagnostics

High & low-side driver FET tests

High-side safing switch regulator and enable control

Four-channel remote sensor interface

PSI-5 satellite sensors

Active wheel speed sensors
Three-channel GPO, HSD or LSD configurable, with PWM 0-100% control

Nine-channel hall-effect, resistive or switch sensor interface

User customizable safing logic

Specific disarm signal for passenger airbag

Temporal and algorithmic Watchdog timers

End of life disposal interface

Temperature sensor

32-bit SPI communications

5.5 V minimum operating voltage at device battery pin

Operating temperature, -40 to 95 °C

Packaging - 100 pins
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