L9690-TR ST Chassis & Body System

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L9690-TR
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Manufacturer : ST
Package/Case : TQFP 128 14x14x1.0
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Stock Resource : Factory Excess Stock / Franchised Distributor
Product Categories : Chassis & Body System
Description : Automotive voltage monitor with watchdog timer

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L9690-TR Overview

The L9690 is an advanced airbag system chip solution targeted for the global airbag market.

High frequency power supply design optimizes system cost by using smaller and less expensive external components. All switching regulators operate at 2 MHz and all buck converters have integrated synchronous rectifiers.

The reserve capacitor is electrically isolated from the boost regulator by integrated switches and external resistors, controlling in-rush current. A capacitor discharge switch is integrated to discharge the capacitor at shutdown.

Low quiescent current permits the device to be directly connected to battery. In this mode, device start-up and shutdown are controlled through the wake-up input pin (actually, shutdown needs also dedicated SPI command too). The power supply and crossover function are controlled automatically through the internal state machine.

For systems with high feature content, two L9690 devices can be used in a master/slave configuration.

The L9690 provides two fully isolated deployment voltage regulators, using the external safing FETs as power elements in the regulator loop. Deployment voltage is set to a nominal 18V value to further optimize system cost.

Integrated safing logic uses a rolling average algorithm and decodes all sensor information within the system remote sensor SPI bus. Number of samples and thresholds are user-programmable. An alternative safing function permits arming from an external source through the Global SPI bus (E2E communication).

Dual SPI interfaces separate device global functions and remote sensors. LIN interface is available, providing OCS message decoding for passenger loop inhibition.

Features

AEC-Q100 qualified
Single chip and master/slave configurations
Boost regulator for energy reserve
2 MHz operation
Output voltage 24 V/33 V ±6%, user-selectable, peak inductor current regulation
Capacitor value and ESR diagnostics
2 MHz operation
Output voltage 24 V/33 V ±6%, user-selectable, peak inductor current regulation
Capacitor value and ESR diagnostics
Boost regulator for low voltage system operation
2 MHz operation
Output voltage, 10 V ±8%, 870 mA max
2 MHz operation
Output voltage, 10 V ±8%, 870 mA max
Buck regulator for remote sensor
2 MHz operation
Output voltage, 6.5 V/8 V ±4%, 700 mA max
2 MHz operation
Output voltage, 6.5 V/8 V ±4%, 700 mA max
Buck regulator for micro controller unit
2 MHz operation
Output voltage, 3.3 V ±3%, 450 mA max
2 MHz operation
Output voltage, 3.3 V ±3%, 450 mA max
Remote sensor interface and SYNC pulse supply voltage inputs and monitorings
Linear regulator with external power PNP transistor, 5 V ±5%, 135 mA max
Integrated energy reserve crossover switch with switch active output indicator, configured as input for slave mode operation
Battery voltage monitor and shutdown with wake-up control
System voltage diagnostics with integrated ADCs
Squib/LEA deployment drivers
12 channel HSD/LSD for squib load
2 over 12 channels supporting LEA load
2 channel couples supporting common-return connection
18 V deployment voltage
Low, high and automatic dynamic deployment current profiles
R measure, STB, STG and leakage diagnostics
High and low side driver FET tests
LEA presence diagnostics
12 channel HSD/LSD for squib load
2 over 12 channels supporting LEA load
2 channel couples supporting common-return connection
18 V deployment voltage
Low, high and automatic dynamic deployment current profiles
R measure, STB, STG and leakage diagnostics
High and low side driver FET tests
LEA presence diagnostics
Two isolated high side safing FET regulators and diagnostics
Six channel PSI-5 v2.3 remote sensor interface
Three channel general purpose low side drivers with 0-100% PWM control
Nine channel hall-effect, resistive or switch sensor interface
User-programmable safing logic and rolling average algorithm
E2E arming procedure through Global SPI
Temporal watchdog timer
End-of-life disposal interface
Temperature sensor
32 bit Global SPI bus interface
32 bit Remote Sensor SPI bus interface, SafeSPI v1.0 compatible
LIN v2.2A interface with OCS message decoding capability
5.4 V min operating voltage at VIN battery input for start-up
Full ISO 26262 compliant, ASIL-D systems ready
Packaging 128 pin

Product Parameters

prmis_id

CP537138
item_name

L9690-TR
p_445
p_1387
p_4418

parent_id

PF266667
p_4906

false
p_5113

0
p_163

Active

Other distributor's price

Part #	Mfg.	Description	Price
L9690-TR	STMicroelectronics	LINEAR IC'S	1000---$9.0000
L9690-TR	STMicroelectronics	Motor / Motion / Ignition Controllers & Drivers	1000---$9.6000
L9690-TR	STMicroelectronics		1000---$8.5800

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