L9658

Specialized ICS Overview

The L9658 is an octal squib driver and quad sensor interface ASIC designed for automotive safety applications. It deploys up to eight squibs and interfaces with four satellite sensors, including Hall effect sensors on channels three and four. The device features independently controlled high-side and low-side MOSFETs for diagnostic purposes. Electrical specifications include a minimum deployment current of 1.2 A for 2 ms and 1.75 A for 1 ms during load dump conditions. It utilizes a 5.5 MHz SPI interface for communication and diagnostics.

Specialized ICS Feature Summary

• Eight deployment drivers sized to deliver 1.2 A (min) for 2 ms and 1.75 A (min) for 1 ms
• Four satellite interfaces supporting Manchester decoder with variable bit rate
• Analog output available for squib resistance measurement
• Short to ground, short to battery, and MOS diagnostics reported via SPI register

Specialized ICS Applications

• Airbag system control units
• Passive safety domain controllers
• Satellite sensor integration in vehicle restraint systems

Specialized ICS Procurement Notes

Verify the Not Recommended for New Design (NRND) status before initiating any new hardware development projects. Confirm that the 64-LQFP package dimensions match the target PCB footprint. Ensure the design accounts for the specific BCD5s technology constraints and thermal requirements associated with the 10x10 mm package outline.

Specialized ICS Selection Notes

Select this component when an octal squib configuration is required alongside quad satellite sensor support. Compare against the L9659 if only squib driving is needed without sensor interfaces, or the L9660 if a quad-channel architecture suffices. Verify that the 5.5 MHz SPI speed and Manchester protocol support align with the microcontroller capabilities in the system design.

Specialized ICS Part Context

The L9658 belongs to STMicroelectronics' portfolio of analog and mixed-signal ICs for chassis and safety applications. It is part of a scalable family of airbag system-on-chip solutions designed to meet ISO 26262 functional safety standards. This device serves as a central processing unit for managing pyrotechnic actuators and remote sensors in modern vehicle restraint architectures.

Specialized ICS Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Due to the NRND status, alternative components should be evaluated based on pin compatibility and electrical parameter equivalence rather than direct cross-reference listings.