NXP Semiconductors PXAS30KBBE,557

Overview

PXAS30KBBE from NXP Semiconductors is a 16-bit OTP-based microcontroller with 32 KB on-chip program memory, 1 KB RAM, 8-channel 8-bit A/D converter (10-bit mode supported), dual UARTs, I²C interface, and 30 MHz operation across 2.7–5.5 V supply. It targets industrial control systems requiring deterministic real-time I/O, analog sensing, and external memory expansion up to 16 MB.

For engineers reviewing the PXAS30KBBE datasheet, PXAS30KBBE pinout, PXAS30KBBE application, or PXAS30KBBE equivalent, key selection criteria include its 80-pin PQFP package, 30 MHz clock at full voltage range, integrated PCA with five capture/compare channels, and support for both 8-bit and 16-bit external bus configurations via programmable address/data width.

Technical Context

The PXAS30KBBE implements an enhanced XA CPU core with 16-bit data path and 24-bit addressing, enabling direct access to up to 16 MB of external memory space. Its memory map separates 32 KB on-chip OTP code space from configurable off-chip program/data regions, with EA/WAIT/VPP pin controlling internal/external execution priority and bus wait insertion.

Peripherals are tightly coupled to the core via dedicated SFRs: the A/D converter uses ADCON/ADCS/ADCFG registers for channel selection, timing, and 10-bit result handling; the five-channel PCA supports edge-triggered capture, software-timed compare, and PWM generation; dual UARTs operate independently with separate baud rate generators and extended status flags for framing, overrun, and break detection.

Key Specifications

Pinout & Package

80-pin Low Profile Quad Flat Pack (PQFP), SOT315-1, 14 × 14 mm body, 0.65 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit microcontroller applications.

Compared with MB90F387 and HD64F3687, the PXAS30KBBE delivers superior analog integration (8-channel A/D + 10-bit mode), richer timing resources (5-channel PCA + dual UARTs + I²C), and broader memory addressing - making it optimal for new designs requiring mixed-signal control without external support ICs.

Availability

PXAS30KBBE is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, PLC I/O modules, and legacy system interface adapters requiring stable component supply and long-term manufacturability.

Supply support for PXAS30KBBE 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 markets.

The XA-S3 product line was designed for high-performance embedded control applications demanding deterministic real-time response, integrated analog front-ends, and flexible external memory expansion - particularly in industrial automation and instrumentation.

FAQ

What is the maximum external memory size supported by the PXAS30KBBE?

The PXAS30KBBE supports up to 16 MB of external memory through its 24-bit address bus. This is implemented via Port 0 (A4–A11), Port 2 (A12–A19), Port 4 (A20–A21), and Port 6 (A22–A23), with ALE and PSEN signals enabling standard 8080-style bus timing. The EA/WAIT/VPP pin determines whether internal OTP or external memory is prioritized during code fetch.

Does the PXAS30KBBE support 10-bit A/D conversion, and how is it enabled?

Yes, the PXAS30KBBE supports 10-bit A/D conversion. It is enabled by setting the ADRES bit in the ADCON register (address 43Eh). When ADRES = 1, the A/D converter performs extended-resolution conversions, storing the upper 8 bits in ADRSHn registers and the two LSBs in the ADRSL register (address 4B8h). Conversion time increases versus 8-bit mode, and ADCFG register settings must be adjusted accordingly.

How many UART interfaces does the PXAS30KBBE have, and are their baud rates independent?

The PXAS30KBBE features two fully independent UART interfaces (UART0 and UART1). Each has its own baud rate generator, control registers (S0CON/S1CON), status registers (S0STAT/S1STAT), and data buffers (S0BUF/S1BUF). This allows simultaneous operation at different speeds - for example, UART0 at 115.2 kbps for sensor telemetry and UART1 at 9.6 kbps for legacy device communication - without resource contention.

What is the function of the RSTOUT pin on the PXAS30KBBE, and how is it used in system design?

The RSTOUT pin (pin 11) outputs an active-low signal whenever the PXAS30KBBE undergoes any reset event - including external RST assertion, watchdog timeout, or execution of the RESET instruction. In system design, RSTOUT is commonly connected to reset inputs of companion ICs (e.g., external memory, transceivers, or FPGAs) to ensure synchronized initialization across the entire board, eliminating race conditions during power-up or fault recovery.

Can the PXAS30KBBE operate from a 3.3 V supply, and what are the implications for I/O voltage levels?

Yes, the PXAS30KBBE operates across 2.7 V to 5.5 V, so 3.3 V is fully supported. At 3.3 V, all digital I/O pins (Ports 0–6) maintain TTL-compatible thresholds: VIH ≥ 2.0 V and VIL ≤ 0.8 V. However, analog subsystems require attention: AVDD must be supplied at the same voltage as VDD (3.3 V), and AVREF+ should not exceed AVDD. The A/D input range becomes 0–3.3 V, and external analog signals must be scaled accordingly.