STMicroelectronics L9663-1

Overview

L9663-1 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 (configurable to 83.3/189 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 reads sensors over shared PSI5 lines in point-to-point or bussed topologies.

For engineers reviewing the L9663-1 datasheet, L9663-1 pinout, L9663-1 application, or L9663-1 equivalent, this page provides verified technical context, VFQFPN28 package mapping, real-world use cases in airbag, ABS, and EPS systems, and validated alternative parts with documented functional trade-offs.

Technical Context

The L9663-1 implements two independent PSI5 transceiver channels with dedicated bootstrap circuits for synchronous pulse generation (VSYNCx), each supporting configurable data rates and Manchester decoding with mark-space error correction. Its integrated charge pump pre-regulator supplies VAS at 5.3 V or 7.6 V, while the FLL module ensures ±0.5% timing accuracy under varying supply and temperature conditions.

It supports two system architectures: Mode 1 (full frame decoding and buffering on-chip) and Mode 2 (raw Manchester output to external µC decoder). Diagnostics include voltage monitoring (VAS, VSYNCx, PSIx), short-to-ground tolerance (±1.5 V ground shift), reverse-voltage protection, and cross-coupling detection - all compliant with ISO 16750-2 and ISO 7637-2 EMC requirements.

Key Specifications

Pinout & Package

Package: VFQFPN28 (5 mm × 5 mm × 1.0 mm, exposed thermal pad down). Pin count: 28. Pitch: 0.5 mm. RoHS-compliant, AEC-Q100 Grade 0 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC33664 and TLE493D-A000, the L9663-1 uniquely combines dual-channel transceiver functionality, crystal-free FLL timing, and integrated VAS pre-regulation - making it the only drop-in solution for ASIL-B/C ECU designs requiring synchronized multi-sensor acquisition without external timing or power components.

Availability

L9663-1 is available at Aetrix Electronics and suitable for automotive airbag control units, ABS ECUs, electric power steering modules, and engine management systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for L9663-1 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 headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, and automotive-grade analog products since 1987.

The L9663-1 belongs to ST's Automotive PSI5 Transceiver product line, engineered specifically for high-reliability sensor interface applications in ASIL-B/C systems where EMC robustness, wide operating range, and functional safety diagnostics are mandatory.

FAQ

What is the difference between Mode 1 and Mode 2 operation?

In Mode 1, the L9663-1 performs full Manchester decoding, error correction, and stores sensor data in its internal receive buffer before SPI transfer to the MCU - reducing host processing load. In Mode 2, it outputs raw Manchester bitstreams directly to the MCU's dedicated PSI5 decoder, shifting frame validation and buffer management to firmware. Selection depends on MCU capability and real-time constraints.

Does L9663-1 require an external crystal?

No. The L9663-1 integrates a Frequency-Locked Loop (FLL) that achieves ±0.5% timing accuracy across –40°C to +140°C and 4.8–35 V without external crystal. An optional external 1–20 MHz clock may be applied to CLKIN to further reduce jitter in ultra-low-latency applications, but it is not required for basic PSI5 compliance.

How does the VAS pre-regulator work with external FETs?

The VAS pre-regulator uses the VASSUP pin to drive an external N-channel MOSFET, regulating VAS to either 5.3 V or 7.6 V depending on configuration. When VASSUP drops below ~6.5 V, the integrated spread-spectrum charge pump activates to maintain VAS regulation - eliminating need for external boost converters in start-stop and cold-crank conditions.

Can L9663-1 support both PSI5 v1.3 and v2.x sensors on the same bus?

Yes. The L9663-1 natively supports both revisions: v1.3 (pulse masking for ECU-to-sensor commands) and v2.x (variable-width sync pulses). It auto-detects revision during initialization and configures Manchester decoder and sync generator accordingly. However, mixing revisions on a single physical bus requires careful timing coordination to avoid protocol conflicts.