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L9680

  • L9680

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L9680 Overview

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 reserve capacitor is electrically isolated from the boost regulator by a 65 mA nominal fixed current source, controlling in-rush an additional capacitor discharge fixed current source is integrated to diagnose the reserve capacitor value and ESR. 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 (VCC 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.

Features

  • AEC-Q100 qualified
  • Boost regulator for energy reserve
  • 1.882 MHz operation, Iload = 70 mA max
  • Output voltage user selectable, 23 V/ 33 V ±5%
  • Capacitor value & ESR diagnostics
  • 1.882 MHz operation, Iload = 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
  • 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
  • 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%
  • 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
  • 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
  • Rmeasure, STB, STG & Leakage diagnostics
  • High & low side driver FET tests
  • 12 channel HSD/LSD
  • 25 V max deployment voltage
  • Various deployment profiles
  • Current monitoring
  • Rmeasure, 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
  • 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 pin

Product Parameters

  • prmis_id

    CP262899

  • item_name

    L9680

  • p_445

  • p_1387

    9.64

  • p_4418

    1000

  • parent_id

    PF252425

  • p_4906

    false

  • p_5113

    0

  • p_163

    Active

Technical Documents

  • AN5023 L9680 airbag system ICDetails>>

  • AN5754 L9680 Cut-off Battery and Pyro FuseDetails>>

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Other distributor's price

Distributor Part # Mfg. Description Price
arrow L9680 STMicroelectronics Automotive Advanced Airbag IC 5.5V to Automotive 100-Pin TQFP EP T/R

1000---$7.9070
digikey L9680 STMicroelectronics 10GX PRE-TERM ASSY WHI 110FT

1---$1,056.0000
future L9680 STMicroelectronics L9680 Series 5.5 V Surface Mount Specialty Interface IC - TQFP-100

1000---$11.9800
mouser L9680 STMicroelectronics Power Management Specialized - PMIC Automotive advanced airbag IC for mid/high end applications

1---$14.6600

10---$13.4800

25---$12.9200

100---$11.3900

250---$10.8300

540---$10.5500
newark L9680 STMicroelectronics Asic |Stmicroelectronics L9680

1---$14.6600
avnet L9680 STMicroelectronics AIRBAG SYSTEMS SENSOR - Tape and Reel (Alt: L9680TR)

1000---$8.8951

2000---$8.7155

4000---$8.5358

6000---$8.3560

8000---$8.1763

10000---$7.9966

100000---$7.8170

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