STMicroelectronics STLUX383ATR

Overview

STLUX383ATR from STMicroelectronics is a digital lighting and power conversion controller integrating an STM8® core, six SMED-based programmable PWM generators (1.3 ns resolution), DALI 2.0-compliant interface, 4× analog comparators (≤50 ns propagation), and 8-channel 10-bit ADC with op-amp gain options. It targets high-precision LED/HID ballast control and resonant SMPS topologies requiring event-driven timing.

For engineers reviewing the STLUX383ATR datasheet, STLUX383ATR pinout, STLUX383ATR application, or STLUX383ATR equivalent, this device is selected for time-critical digital power control where sub-10 ns event response, hardware DALI encoding, and autonomous SMED state machines eliminate software latency in PFC, LLC, and asymmetric half-bridge regulation.

Technical Context

The STLUX383ATR implements six independent SMED units-each a hardware finite-state machine reacting to internal/external events with ≤10.4 ns detection latency and dithered 1.3 ns PWM resolution-enabling deterministic, software-free PWM generation for multi-phase resonant converters. Its DALI peripheral provides interrupt-driven IEC 62386-compliant frame encoding at 1.2/2.4/4.8 kHz with configurable noise rejection and reverse-polarity tolerance.

Four analog comparators feed directly into SMED event inputs with 4-bit internal references and <50 ns propagation delay, supporting zero-current detection in synchronous rectification. The 10-bit ADC includes programmable x1/x4 gain and sequencer mode for closed-loop current/voltage sampling across up to eight channels, with 1 MΩ input impedance.

Key Specifications

Pinout & Package

TSSOP38 package (38-pin thin shrink small outline package) with exposed thermal pad; pin-compatible with STLUX385A but excludes PWM5 output.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital lighting and power conversion controller applications.

Compared with STLUX383ATR, STLUX385A adds a sixth PWM output in a different package, while STLUX325A reduces pin count and analog resources-both share identical SMED architecture, DALI engine, and core timing performance, making them functionally aligned but mechanically and channel-count differentiated.

Availability

STLUX383ATR is available at Aetrix Electronics and suitable for LED ballast design, resonant SMPS development, and DALI-2 lighting system integration requiring stable component supply and long-term industrial lifecycle support.

Supply support for STLUX383ATR 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STLUX™ family is engineered specifically for digital lighting control and high-efficiency switched-mode power supplies, combining deterministic hardware timing (SMED) with embedded supervision (STM8) to replace legacy analog+MCU solutions.

FAQ

What is the role of the SMED subsystem in STLUX383ATR?

The SMED (State Machine Event Driven) subsystem comprises six autonomous hardware state machines that generate PWM signals in response to internal or external events-such as comparator outputs or digital inputs-with ≤10.4 ns detection latency and 1.3 ns resolution. It operates independently of the STM8 CPU, enabling deterministic, jitter-free timing for resonant converters and LED dimming without software intervention.

Does STLUX383ATR support DALI-2 commands and configuration?

Yes, STLUX383ATR implements full IEC 62386-102 (DALI-2 slave) compliance including 24-bit extended frame support, configurable noise rejection filtering, and reverse-polarity tolerant DALI_TX/RX lines. Its hardware encoder handles frame generation and decoding without CPU overhead, supporting all standard DALI commands, scene storage, and group addressing per specification.

How does the ADC achieve 12-bit equivalent resolution?

The integrated 10-bit ADC achieves 12-bit equivalent resolution by routing its input through an on-chip operational amplifier with selectable x1 or x4 gain. When configured for x4 gain, the effective LSB size is reduced by a factor of four, extending dynamic range-verified in ST's characterization data under 1 MΩ input impedance and sequencer-enabled multi-channel sampling.

What package and pin compatibility does STLUX383ATR offer?

STLUX383ATR uses the TSSOP38 package with 38 leads and an exposed thermal pad. It shares pinout compatibility with STLUX385A on all functional pins except PWM5, which is not bonded on STLUX383ATR. This enables drop-in replacement in existing STLUX385A layouts where PWM5 is unused, simplifying migration and inventory consolidation.