STMicroelectronics L9663

Overview

L9663 from STMicroelectronics is an AEC-Q100 qualified dual-channel PSI5 transceiver IC for automotive sensor communication, supporting both PSI5 v1.3 and v2.x standards. It delivers Manchester-coded digital data at 125 kbps (with optional 83.3 kbps and 189 kbps), features integrated FLL-based timing control, 32-bit SPI interface with address multiplexing, and operates from 4.8 V to 35 V across –40°C to +140°C ambient. It powers and communicates with PSI5 sensors over a shared line in synchronous or asynchronous bus modes.

For engineers reviewing the L9663 datasheet, L9663 pinout, L9663 application, or L9663 equivalent, this device is selected for ECU-level sensor aggregation in safety-critical automotive systems requiring high EMC robustness, reverse voltage protection, short-to-ground tolerance (±1.5 V ground shift), and diagnostic coverage including VAS/PSIx voltage monitoring, sync pulse amplitude checks, and sensor data consistency validation.

Technical Context

The L9663 implements two independent PSI5 transceiver channels-each with dedicated bootstrap circuits for synchronous pulse generation (VSYNCx), integrated charge pump pre-regulation for VAS, and FLL-based clock recovery ensuring <±0.5% timing accuracy under varying load and temperature. Its receiver includes digital sampling, Manchester decoding with mark-space error correction, and automatic storage of sensor initialization data.

It supports two system architectures: Mode 1 (full on-chip decoding and buffering into internal RAM, SPI-readable via 32-bit interface) and Mode 2 (raw Manchester output to external µC with dedicated PSI5 decoder). Diagnostics cover voltage monitoring (VAS, VSYNCx, PSIx), short-circuit detection, reverse voltage protection, and cross-coupling tests-all compliant with ISO 26262 ASIL-B ready functional safety requirements.

Key Specifications

Pinout & Package

Available in two RoHS-compliant packages: VFQFPN28 (5 × 5 × 1.0 mm, exposed pad up) and TQFP32EP (7 × 7 × 1.0 mm, exposed pad down). Both support thermal dissipation required for continuous operation at 140°C ambient.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PSI5 transceiver applications.

Compared with MC33664 and TLE493D-W2B6, the L9663 uniquely combines dual-channel transceiver functionality, integrated FLL timing, VAS pre-regulation, and comprehensive diagnostics-making it the only solution capable of standalone ECU-level PSI5 sensor hub implementation with ASIL-B readiness.

Availability

L9663 is available at Aetrix Electronics and suitable for wheel speed sensing, engine position tracking, air suspension control, and brake pressure monitoring requiring stable component supply across automotive production lifecycles.

Supply support for L9663 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 solutions, with broad portfolio of AEC-Q100 qualified products and functional safety certifications.

The L9663 belongs to ST's automotive interface IC product line, engineered specifically for robust, high-integrity sensor communication in ECU applications demanding PSI5 v1.3/v2.x compliance, wide supply range, and integrated diagnostics.

FAQ

What are the supported PSI5 protocol versions and key compatibility constraints?

The L9663 supports both PSI5 v1.3 and v2.x standards, including synchronous and asynchronous modes, variable data word lengths (8–28 bits), and bussed or point-to-point topologies. Key constraints include mandatory use of Mode 1 for v2.x sync pulse generation and separate VSYNCx voltage requirements (≥11 V) during sync pulses-details are specified in Sections 1.2 and 3.5 of DS11401 Rev 7.

How does the integrated FLL improve timing accuracy compared to crystal-based alternatives?

The FLL locks to the incoming Manchester-encoded signal's edge transitions, achieving ±0.5% frequency accuracy across –40°C to +140°C and 4.8–35 V supply range-without external crystal or trimming. This eliminates crystal cost, board space, and aging drift, while maintaining decoding reliability under voltage transients and thermal stress where crystal oscillators may fail to start or jitter.

Can the L9663 operate with only asynchronous PSI5 communication, and what supply rails are required?

Yes-the L9663 fully supports asynchronous mode using only the VAS supply (5.3 V or 7.6 V) for sensor power and interface operation; VSYNCx generation and bootstrap circuitry remain inactive. VB (4.8–35 V) and VDD (3.3/5 V) must still be powered for internal logic and SPI/DOUT operation, but no synchronous pulse infrastructure is needed.

What diagnostic capabilities are implemented for sensor line fault detection?

The L9663 provides six dedicated diagnostics: PSIx output under-voltage detection (t_UV = 1.2 µs), PSIx reverse voltage monitoring (–18 V tolerance), VAS under/over-voltage lockout, synchronous pulse amplitude verification, buffer empty status flag, and cross-coupling test between channels-each with configurable interrupt reporting via DOUT1/DOUT2 pins per Section 3.7 and Table 7 of the datasheet.