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STMicroelectronics L9662
- Part No.:
- L9662
- Manufacturer:
- STMicroelectronics
- Category:
- Specialized
- Package:
- 64-LQFP
- Datasheet:
-
L9662.pdf
- Description:
- IC INTERFACE SPECIALIZED 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,794
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Product details
Overview
L9662 from STMicroelectronics is an octal squib driver and quad Manchester/PSI5 satellite sensor interface ASIC for automotive airbag control units. It integrates 8 high-current deployment drivers (1.2 A min/2 ms, 1.75 A min/0.65 ms) and 4 independent satellite interfaces supporting Manchester-1/2 and PSI5 protocols with variable bit rate detection, enabling simultaneous squib firing and real-time sensor data acquisition in safety-critical crash event systems.
For engineers reviewing the L9662 datasheet, L9662 pinout, L9662 application, or L9662 equivalent, key selection considerations include dual SPI interfaces (5.5 MHz), independent current trip point programming per satellite channel, Hall effect sensor support on channels 3–4, and full diagnostic coverage including squib short-to-ground/battery detection and MOSFET health monitoring.
Technical Context
The L9662 implements two functionally segregated subsystems: eight high-side/low-side squib drivers with programmable firing current/timing via SPI, and four satellite sensor interfaces capable of decoding Manchester-1, Manchester-2, and PSI5 (Parity) protocols with sync pulse and minibus support. Each satellite channel features independent current limit, fault timer shutdown, and short-to-ground/battery reporting.
Diagnosis is hardware-accelerated: squib resistance measurement is enabled via analog output (AOUT), while SPI registers provide real-time status of high-side/low-side MOS integrity, VRES voltage conditions, and deployment success flags. The device operates across -40°C to +85°C ambient with 2 kV ESD protection on all pins and uses proprietary BCD5 technology for robust high-voltage switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Squib drive capability | 1.2 A min / 2 ms, 1.75 A min / 1.0 ms, or 1.75 A min / 0.65 ms at VRES = 7–37 V; 1.5 A min / 2 ms at VRES = 7–25 V - enables reliable pyrotechnic actuation under load dump conditions. |
| Satellite interface count | 4 independent channels - supports up to four remote sensors (e.g., acceleration, pressure, seat occupancy) with protocol flexibility. |
| Supported protocols | Manchester-1, Manchester-2, PSI5 (Parity) - ensures interoperability with legacy and next-gen automotive satellite sensors per PSI5 v1.2 spec. |
| SPI interfaces | 2 independent 5.5 MHz SPI buses (SPI_D for drivers, SPI_S for satellites) - enables concurrent configuration and real-time diagnostics without bus contention. |
| Diagnostic coverage | Squib short-to-ground/battery, MOSFET open/short, VRES undervoltage, and satellite message error detection - provides ASIL-B compliant fault detection per ISO 26262. |
| Operating temperature | -40°C to +85°C - qualified for under-hood and passenger compartment placement in automotive ECUs. |
| Package | LQFP64 (10 × 10 × 1.4 mm) - surface-mount package with dedicated power/ground pins per channel for low-noise, high-current loop stability. |
Pinout & Package
Package: LQFP64 (10 × 10 × 1.4 mm), 0.5 mm pitch, with separate analog/digital ground planes and dedicated GND pins per squib channel (GND0–GND7) to minimize crosstalk and ensure stable current sensing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MISO / MISO_S | SPI data output (driver/satellite) | Provides readback of register status, fault flags, and measured values; Hi-Z reset state prevents bus contention during initialization. |
| FEN1–FEN4 | Fire enable inputs | Four independent enable signals controlling pairs of squib channels (0–1, 2–3, 4–5, 6–7); pulldown default ensures safe power-on state. |
| SQHx / SQLx (x=0–7) | High-side / low-side squib drivers | Complementary MOS outputs per channel; SQHx drives load to VRES, SQLx sinks to GND - enables flexible deployment topologies (high-side, low-side, or H-bridge). |
| VRES0–VRES7 | Reserve voltage inputs | Independent supply inputs per squib loop; supports wide 7–37 V range and enables redundancy or isolated power domains per channel. |
| ICH0–ICH3 | Satellite current sense outputs | Analog current feedback for each satellite channel; used for real-time loop integrity verification and fault threshold comparison. |
| AOUT | Analog output | Single-ended voltage output proportional to squib loop resistance - enables offline squib continuity check without firing. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SPI interfaces | Separate 5.5 MHz SPI_D (for squib control/diagnostics) and SPI_S (for satellite configuration/data) eliminate timing conflicts and simplify firmware partitioning. |
| Hall sensor support on channels 3–4 | Direct interface to Hall-effect position sensors without external signal conditioning - reduces BOM count and improves crash-detection latency. |
| Programmable per-channel current trip points | Each satellite channel's overcurrent threshold is individually configurable via SPI - enables mixed-sensor deployments (e.g., low-power accelerometers + high-current pressure transducers). |
| Simultaneous multi-channel firing | All 8 squibs can be triggered within <1 µs skew - critical for coordinated airbag inflation sequences in side-impact or rollover events. |
| Loss-of-ground detection | Hardware-monitored GND path integrity per squib loop - detects broken ground traces before deployment, preventing unsafe single-point failures. |
Applications
| Frontal Collision Detection | Side-Impact Airbag Control |
|---|---|
|
Use Scenario: Detects rapid deceleration using integrated satellite accelerometers and triggers primary driver/passenger airbags within 15 ms of impact onset. IC Role / Device Role / Timing Role: L9662 acts as central squib controller and sensor hub - receives Manchester-encoded acceleration data, validates integrity via parity checks, and fires up to 4 squibs synchronously. Use Value: Sub-20 ms end-to-end response time enabled by parallel satellite decoding and zero-latency SPI register access to deployment status flags. |
Use Scenario: Monitors door-mounted pressure sensors and seat-position Hall sensors to determine optimal side-curtain and torso airbag deployment timing during T-bone collisions. IC Role / Device Role / Timing Role: L9662 interfaces 2 PSI5 pressure sensors and 2 Hall sensors (channels 3–4), performs real-time current-loop diagnostics, and fires 4 squibs with <1 µs inter-channel skew. Use Value: Independent current limit per satellite channel allows simultaneous operation of high-bandwidth PSI5 sensors and low-power Hall elements without signal interference. |
| Rollover Occupancy Sensing | Multi-Stage Inflation Control |
|
Use Scenario: Reads seat occupancy and roll-rate data from roof-mounted satellite sensors to decide whether to deploy curtain airbags and suppress front bags in rollover events. IC Role / Device Role / Timing Role: L9662 decodes variable-bit-rate Manchester-2 signals from inertial modules, cross-checks validity against sync pulse timing, and activates squibs only when dual-sensor correlation confirms rollover. Use Value: Sync pulse and minibus support enable daisy-chained satellite networks with deterministic latency - essential for time-critical rollover decisions. |
Use Scenario: Controls staged inflation of driver airbag using two squib circuits (primary + secondary) with different firing currents/times to match occupant proximity and crash severity. IC Role / Device Role / Timing Role: L9662 configures distinct firing profiles (e.g., 1.2 A/2 ms for primary, 1.75 A/0.65 ms for secondary) via SPI-deployed mode registers and monitors loop resistance pre-firing via AOUT. Use Value: SPI-selectable firing current and timing allow precise energy delivery tuning - reduces injury risk for out-of-position occupants while maintaining compliance with FMVSS 208. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar squib driver and satellite interface applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NXP MC33816 | 6-channel squib driver; supports only PSI5 (no Manchester); single SPI interface; no Hall sensor support on satellite channels. | Limited to PSI5-only satellite ecosystems; lacks dual-protocol flexibility and Hall integration required for hybrid sensor nodes. | Choose when system uses exclusively PSI5 sensors and requires lower channel count with higher integration density. |
| Renesas RAA215210 | Octal squib driver with SPI and SENT satellite interface; no Manchester/PSI5 support; includes built-in watchdog and CRC-protected memory. | Targets SENT-based sensor networks; lacks protocol compatibility with existing Manchester/PSI5 satellite infrastructure. | Prefer for new designs adopting SENT v4.0 and requiring enhanced functional safety memory features over legacy protocol support. |
Compared with MC33816 and RAA215210, the L9662 uniquely combines octal squib drive, dual-protocol (Manchester/PSI5) satellite decoding, Hall sensor support, and dual SPI interfaces - making it the only solution for retrofitting legacy Manchester systems while adding PSI5 readiness and multi-sensor fusion capability.
Availability
L9662 is available at Aetrix Electronics and suitable for automotive airbag control units, crash event data recorders, and advanced driver assistance system (ADAS) safety domain controllers requiring stable component supply, long-term lifecycle assurance, and ASIL-B compliant diagnostics.
Supply support for L9662 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader specializing in automotive, industrial, and power management ICs, with over 30 years of safety-critical system expertise and ISO/TS 16949-certified manufacturing.
The L9662 belongs to ST's automotive safety ASIC product line, designed specifically for airbag electronic control units (ECUs) requiring high-reliability squib actuation, multi-protocol sensor interfacing, and comprehensive hardware-level diagnostics per ISO 26262 ASIL-B requirements.
FAQ
What is the maximum VRES voltage supported per squib channel?
The L9662 supports VRES voltages from -0.3 V to 40 V per channel (VRES0–VRES7), with guaranteed squib firing performance across 7 V to 37 V. This wide range accommodates battery transients during load dump events while maintaining 1.75 A minimum current delivery for 0.65 ms, ensuring reliable pyrotechnic actuation under worst-case electrical conditions.
How does the L9662 handle Manchester and PSI5 protocol coexistence?
The L9662 supports Manchester-1, Manchester-2, and PSI5 (Parity) protocols on the same four satellite channels via SPI-configurable MCR/CCR registers. Protocol selection is per-channel and dynamic - allowing mixed deployments (e.g., Manchester-1 accelerometers + PSI5 pressure sensors) without hardware changes or firmware recompilation.
Can the L9662 perform squib resistance measurement without firing?
Yes. The L9662 provides non-invasive squib continuity checking via its AOUT analog output pin, which delivers a voltage proportional to loop resistance. This measurement is performed using internal current sources and precision ADCs, enabling pre-deployment verification while keeping SQHx/SQLx in safe high-impedance states - critical for functional safety compliance.
What diagnostic capabilities are available for satellite sensor interfaces?
Each satellite channel offers short-to-ground and short-to-battery detection, independent current limit shutdown with programmable thresholds, variable bit rate detection, and message error reporting via SPI status registers. Satellite-specific diagnostics are reported separately per channel (ICH0–ICH3), enabling precise fault isolation in multi-sensor configurations without cross-channel interference.
L9662 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Applications:
- Squib Driver
- Interface:
- SPI
- Voltage - Supply:
- 4.5V ~ 5.5V
- Supplier Device Package:
- 64-LQFP (10x10)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
L9662 FAQ
1.How can I place an order for L9662 through Aetrix?
Please submit a Request for Quotation (RFQ) for L9662 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for L9662 reliable?
The price and inventory of L9662 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9662 is usually 5 days.
3.What payment methods are accepted for L9662?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9662 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L9662?
L9662 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L9662 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for L9662?
For technical support, including L9662 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9662 requirements.
6.How does Aetrix verify that L9662 is sourced from the original manufacturer or authorized distributors?
All L9662 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L9662 meets industry standards.
7.What is the process for return or replacement of L9662?
All L9662 units undergo pre-shipment inspection (PSI). If there is an issue with L9662, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The L9662 part is unused and in its original packaging.
Return procedure for L9662:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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