L9680TR TQFP-100 interface IC ST agent source price discount

Description

The L9680 is an advanced airbag system chip solution targeted for mature airbag market

and 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
 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 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
 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 pin