NXP Semiconductors UJA1023T/2R04/C,51

Overview

UJA1023T/2R04/C,51 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 configurable I/O pins. It autonomously handles LIN protocol, supports automatic bit rate synchronization (1–20 kbit/s), and operates across −40 °C to +125 °C for automotive body electronics applications.

For engineers reviewing the UJA1023T/2R04/C,51 datasheet, UJA1023T/2R04/C,51 pinout, UJA1023T/2R04/C,51 application, or UJA1023T/2R04/C,51 equivalent, this page delivers verified functional scope, validated I/O configuration modes, confirmed low-power behavior (≤65 μA in sleep), LIN transceiver compliance, and exact SO16 package mapping - all directly traceable to NXP's Rev. 5 product data sheet.

Technical Context

The UJA1023T/2R04/C,51 integrates a LIN 2.0 controller with daisy-chain and plug-coding NAD assignment, an embedded LIN transceiver featuring 30 kΩ termination and ISO 7637 bus protection, and automatic bit rate detection that validates sync break and field integrity before message acceptance. Its oscillator provides timing reference for both bit rate adaptation and internal digital functions.

I/O configuration occurs via LIN MasterReq/SlaveResp frames using sequential four-block data dumps; each of the eight P0–P7 pins supports input (edge capture, local wake-up, analog), output (high-side/low-side/push-pull, PWM at ~2.7 kHz, cyclic sense), or switch matrix (4×2/4×3/4×4) roles - all programmable over the LIN bus without external components.

Key Specifications

Pinout & Package

UJA1023T/2R04/C,51 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 environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with UJA1023T/2R04/C,51, the UJA1061TK/0Z adds CAN capability but removes ADC and integrated termination, while the MC33662ELF provides only transceiver functionality - making UJA1023T/2R04/C,51 uniquely suited for cost-sensitive, space-constrained LIN slave nodes needing self-contained I/O, analog sensing, and ultra-low-power sleep.

Availability

UJA1023T/2R04/C,51 is available at Aetrix Electronics and suitable for automotive body electronics, seat control units, roof modules, and climate control panels requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for UJA1023T/2R04/C,51 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 secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in automotive networking and embedded processing.

The UJA1023 series belongs to NXP's LIN slave portfolio designed specifically for replacing discrete I/O components in automotive electronic control units - emphasizing integration, low power, and robustness in harsh electrical environments.

FAQ

What LIN protocol versions does the UJA1023T/2R04/C,51 support?

The UJA1023T/2R04/C,51 natively supports LIN 2.0 and SAE J2602, and maintains backward compatibility with LIN 1.3. It implements the LIN diagnostic and configuration specification Rev. 2.0, enabling standardized NAD assignment, frame ID programming, and I/O configuration via MasterReq/SlaveResp frames - all confirmed in NXP's Rev. 5 datasheet.

How is Node Address (NAD) assigned on the UJA1023T/2R04/C,51?

NAD assignment on the UJA1023T/2R04/C,51 occurs either automatically at power-on based on C1–C3 pin states (defaulting to hex 60–67), or dynamically via LIN 'assign NAD' command using daisy chain or plug ID methods. The assign NAD request uses specific data byte patterns (e.g., D0 = 0x21 for daisy chain, D0 = 0x08–0x0F for plug ID), and the UJA1023T/2R04/C,51 validates configuration pin levels or daisy chain flag status before accepting new NAD values.

Can the UJA1023T/2R04/C,51 perform analog-to-digital conversion?

Yes - the UJA1023T/2R04/C,51 includes an 8-bit ADC function. Any of its eight bidirectional I/O pins (P0–P7) can serve as the analog input channel, selected via configuration register ADCIN[2:0]. Implementation requires three external passive components (two resistors and one capacitor) as specified in Section 7.1.6 of the datasheet, and conversion is initiated and controlled entirely over the LIN bus.

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

During Sleep mode, the UJA1023T/2R04/C,51 can retain the last output state or transition to a user-programmable state. In case of LIN bus faults (e.g., short-to-ground), it automatically enters low-power Limp Home mode and drives outputs to a preconfigured safe state - both behaviors are fully configurable via LIN messages and documented in Sections 7.1.5 and 7.1.8 of the UJA1023T/2R04/C,51 datasheet.

Does the UJA1023T/2R04/C,51 require an external crystal or resonator?

No - the UJA1023T/2R04/C,51 integrates an on-chip oscillator that serves as the timebase for automatic bit rate detection and internal digital functions. This eliminates the need for external timing components, reduces BOM count, and improves board-level reliability - a key differentiator confirmed in the General Description and Block Diagram sections of the official NXP datasheet.