NXP Semiconductors UJA1023T/2R04,518

Overview

UJA1023T/2R04,518 from NXP Semiconductors is a stand-alone LIN 2.0 / SAE J2602-compliant I/O slave IC with integrated transceiver, on-chip oscillator, 30 kΩ bus termination, and eight bidirectional I/O pins configurable via LIN bus messages. It supports automatic bit rate synchronization from 1 kbit/s to 20 kbit/s and operates across −40 °C to +125 °C for automotive body electronics control units.

For engineers reviewing the UJA1023T/2R04,518 datasheet, UJA1023T/2R04,518 pinout, UJA1023T/2R04,518 application, or UJA1023T/2R04,518 equivalent, this device serves as a drop-in replacement for discrete LIN interface + I/O logic in door modules, seat controls, and lighting nodes where low-power operation, local wake-up, and PWM dimming are required.

Technical Context

The UJA1023T/2R04,518 integrates a LIN 2.0 controller with autonomous NAD and frame ID assignment via daisy chain or plug coding, an embedded LIN transceiver compliant with ISO 7637 bus protection, and a dedicated 8-bit ADC with per-pin analog input selection. Its automatic bit rate detection validates sync break and sync field before message acceptance.

Each of the eight I/O pins (P0–P7) is individually configurable as high-side, low-side, or push-pull driver; cyclic sense input; edge-capturing input (rising/falling/both); PWM output (8-bit resolution, ~2.7 kHz base frequency); or switch matrix node. The INH pin controls external regulators or enables internal ADC reference.

Key Specifications

Pinout & Package

UJA1023T/2R04,518 is housed in a plastic small outline package (SO16) with 16 leads and 3.9 mm body width (SOT109-1), optimized for automated PCB assembly and thermal performance in automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLE7209-11ES and L9637D, the UJA1023T/2R04,518 uniquely integrates LIN protocol handling, transceiver, termination, 8 configurable I/Os, ADC, and PWM in one SO16 package - delivering full node autonomy without external logic or mixed-signal components.

Availability

UJA1023T/2R04,518 is available at Aetrix Electronics and suitable for automotive door modules, seat control units, interior lighting systems, and roof console interfaces requiring stable component supply across extended temperature and long production lifecycles.

Supply support for UJA1023T/2R04,518 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 leader focused on automotive, industrial, and IoT applications, with deep expertise in secure connectivity and embedded processing.

The UJA1023T/2R04,518 belongs to NXP's LIN slave portfolio designed specifically for cost-sensitive, space-constrained automotive body electronics nodes requiring autonomous I/O management and robust bus communication.

FAQ

What LIN protocol versions does the UJA1023T/2R04,518 support?

The UJA1023T/2R04,518 fully supports LIN 2.0 and SAE J2602 standards, and maintains backward compatibility with LIN 1.3. It implements the LIN diagnostic and configuration specification Rev. 2.0 for NAD assignment, frame ID programming, and I/O configuration via MasterReq/SlaveResp message sequences - ensuring interoperability across generations of automotive LIN masters.

How is Node Address (NAD) configured on the UJA1023T/2R04,518?

NAD configuration on the UJA1023T/2R04,518 occurs either at power-on via C1/C2/C3 pin levels (default NAD 0x60–0x67), or dynamically via LIN 'assign NAD' command using daisy chain or plug ID methods. The daisy chain method uses C1/C3 to cascade configuration; plug ID compares C1–C3 against D0[2:0] in the request frame. Both methods require valid supplier ID (0x0011) and function ID (0x0000) in the request.

Can the UJA1023T/2R04,518 perform analog-to-digital conversion?

Yes - the UJA1023T/2R04,518 includes an 8-bit ADC that uses any of its eight I/O pins (P0–P7) as analog input, one at a time. Configuration requires three external components (two resistors and one capacitor) per channel, and the ADC is enabled via INH pin control and I/O mode setting (IM[1:0] = 01 in first configuration block). Input channel selection is controlled by ADCIN[2:0] bits.

What happens to I/O states during low-power or fault conditions?

In Sleep mode, the UJA1023T/2R04,518 can retain last output state or switch to a user-programmable state. On LIN bus fault (e.g., short-to-ground), it automatically enters Limp Home mode and drives outputs to preconfigured safe states - both behaviors are defined during initial LIN configuration and stored in nonvolatile settings, ensuring predictable fail-safe operation without host MCU intervention.

Does the UJA1023T/2R04,518 require an external crystal or clock source?

No - the UJA1023T/2R04,518 integrates an on-chip oscillator that provides the internal clock for digital logic and serves as the timebase for automatic bit rate detection. This eliminates the need for external crystals, ceramic resonators, or RC networks, simplifying design, reducing bill-of-materials, and improving reliability in vibration-prone automotive environments.