NXP Semiconductors UJA1023T/2R04,512

Overview

UJA1023T/2R04,512 from NXP Semiconductors is a stand-alone LIN 2.0 / SAE J2602-compliant I/O slave IC with integrated transceiver, on-chip oscillator, 8-bit ADC, and eight bidirectional I/O pins configurable via LIN bus messages - used in automotive body electronics for switch sensing, PWM-controlled backlighting, and local wake-up in low-power vehicle subsystems.

For engineers reviewing the UJA1023T/2R04,512 datasheet, UJA1023T/2R04,512 pinout, UJA1023T/2R04,512 application, or UJA1023T/2R04,512 equivalent, key selection considerations include LIN bit rate synchronization (1–20 kbit/s), integrated 30 kΩ termination, configurable high-/low-side output drivers, cyclic sense mode, and limp-home fail-safe behavior under LIN bus fault conditions.

Technical Context

The UJA1023T/2R04,512 implements a full LIN 2.0 controller with automatic bit rate detection (1–20 kbit/s), integrated LIN transceiver compliant to SAE J2602 and ISO 7637, and internal 30 kΩ bus termination. It supports daisy-chain or plug-coding NAD assignment and handles frame ID reconfiguration via LIN diagnostic commands.

Its I/O block enables per-pin configuration as input (standard, edge-capture, analog, local wake-up) or output (high-side, low-side, push-pull, PWM, cyclic sense), with switch matrix support up to 4×4 (16 switches). An on-chip oscillator provides timing reference for bit rate detection and digital functions.

Key Specifications

Pinout & Package

Package: SO16 (plastic small outline package; 16 leads; body width 3.9 mm; SOT109-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LIN I/O slave applications.

Compared with MC33661ELR2 and TLIN1029QPWRQ1, the UJA1023T/2R04,512 uniquely integrates LIN controller, transceiver, 8 configurable I/Os, 8-bit ADC, and PWM in one SO16 package - eliminating need for companion MCU or external peripherals in cost- and space-constrained body electronics modules.

Availability

UJA1023T/2R04,512 is available at Aetrix Electronics and suitable for automotive door modules, seat control units, climate control panels, and LED backlighting systems requiring stable component supply across extended temperature and long production lifecycles.

Supply support for UJA1023T/2R04,512 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

NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and IoT applications - with leadership in automotive networking and embedded processing.

The UJA1023 product line was designed specifically for distributed LIN-based body electronics, enabling cost-effective replacement of discrete I/O components in automotive ECUs while meeting stringent AEC-Q100 reliability and EMC requirements.

FAQ

What LIN protocol versions does the UJA1023T/2R04,512 support?

The UJA1023T/2R04,512 supports LIN 2.0 and SAE J2602 as primary compliance targets, and maintains backward compatibility with LIN 1.3. It implements full diagnostic and configuration services per LIN Specification Rev. 2.0, including assign NAD, assign frame ID, and read by identifier - all handled autonomously without host MCU intervention. The UJA1023T/2R04,512 does not support LIN 2.2A or later revisions.

How is Node Address (NAD) configured on the UJA1023T/2R04,512?

NAD configuration on the UJA1023T/2R04,512 occurs either at power-on via C1–C3 pin states (default NAD 0x60–0x67), or dynamically via LIN master request using daisy-chain or plug-ID methods. Daisy-chain mode uses C1/C3 to cascade configuration across multiple slaves; plug-ID compares C1–C3 levels against data byte D0[2:0] in the assign NAD command. Both methods require valid supplier ID (0x0011) and function ID (0x0000) in the request frame.

Can the UJA1023T/2R04,512 operate without an external microcontroller?

Yes - the UJA1023T/2R04,512 is a stand-alone LIN I/O slave that requires no external MCU for core operation. It autonomously handles LIN protocol processing, bit rate synchronization, NAD/frame ID assignment, and I/O configuration via LIN bus messages. Host interaction is limited to issuing LIN configuration and status requests; all real-time I/O control (e.g., PWM generation, edge capture, ADC sampling) runs independently within the UJA1023T/2R04,512.

What failure modes trigger the limp-home mode in the UJA1023T/2R04,512?

Limp-home mode activates in the UJA1023T/2R04,512 upon detection of LIN bus faults including short-to-ground, open circuit, or persistent dominant bus state - verified by internal bus monitoring logic. When triggered, outputs transition to user-programmable safe states (e.g., all OFF or defined high/low), and the device enters low-power Limp Home sleep mode with typical current draw of 45 μA. This behavior is defined in the device's fault-handling firmware and requires no external supervision.

Does the UJA1023T/2R04,512 support both high-side and low-side switching on the same I/O pin?

No - each I/O pin (P0–P7) in the UJA1023T/2R04,512 can be configured exclusively as high-side driver, low-side driver, or push-pull driver, but not simultaneously as both high- and low-side. Configuration is set per pin via the first I/O configuration data block (D6/D7 OM0/OM1 bits), and remains fixed until reconfigured via LIN command. Push-pull mode enables bidirectional current flow, while high/low-side modes provide dedicated sourcing/sinking paths with built-in protection.