NXP Semiconductors MC9S08PA8VWJR

Overview

MC9S08PA8VWJR from NXP Semiconductors is an 8-bit S08 microcontroller designed for cost-sensitive industrial and automotive control applications, featuring 8 KB flash, 2 KB RAM, 256 B EEPROM, 12-bit ADC (12-channel), and operation up to 20 MHz across –40 °C to 105 °C. It integrates dual FTM modules (6+2 channels), two SCI/LIN interfaces, I²C, SPI, RTC, and analog comparator.

For engineers reviewing the MC9S08PA8VWJR datasheet, MC9S08PA8VWJR pinout, MC9S08PA8VWJR application, or MC9S08PA8VWJR equivalent, key selection considerations include its 20-pin SOIC package, V-grade temperature range, flash size differentiation from PA16 variants, peripheral count reduction (e.g., 10-channel ADC vs. 12), and compatibility with single-wire background debug interface.

Technical Context

The MC9S08PA8VWJR implements an enhanced 8-bit S08 CPU core with four-level nested interrupt support and up to 40 interrupt/reset sources. Its clock system combines a 31.25 kHz–20 MHz external crystal oscillator (XOSC) and an internal clock source (ICS) with frequency-locked-loop (FLL) for precise bus timing up to 20 MHz.

System-level protection includes independent watchdog timer, programmable low-voltage detect (LVD) with four warning thresholds, illegal opcode/address detection, and flash/RAM access protection. Power management supports Stop3 mode with ~1.35 µA typical current and peripheral clock gating via SIM module.

Key Specifications

Pinout & Package

MC9S08PA8VWJR is housed in a 20-pin SOIC package (package code "WJ") with 18 GPIOs, including two true open-drain outputs (PTA2, PTA3), one output-only pin (PTA4/BKGD), and four ultra-high-current sink pins (PTB4, PTB5, PTD0, PTD1) rated for 20 mA source/sink.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with MC9S08PA8VWJR, MC9S08PA8VTJ offers identical functionality in a surface-mount-optimized TSSOP package, while S9KEAZ128AMLH represents a platform upgrade path with ARM architecture, expanded memory, and enhanced peripheral set - neither is pin-compatible, but both serve overlapping industrial control use cases.

Availability

MC9S08PA8VWJR is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart appliance, and sensor node applications requiring stable component supply and long-term manufacturability.

Supply support for MC9S08PA8VWJR 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 specializing in secure connectivity solutions for automotive, industrial, and IoT markets, with deep expertise in microcontrollers, RF, and analog technologies.

The MC9S08PA family was engineered for cost-effective, robust control in harsh environments - emphasizing low-power operation, integrated analog peripherals, and automotive-grade reliability across extended temperature ranges.

FAQ

What is the maximum operating frequency of the MC9S08PA8VWJR?

The MC9S08PA8VWJR supports a maximum bus frequency of 20 MHz across its full operating voltage range (2.7 V to 5.5 V) and temperature range (–40 °C to +105 °C). This is achieved using either the internal clock source (ICS) with FLL or an external crystal oscillator (XOSC) up to 20 MHz. The actual achievable frequency depends on supply voltage and temperature conditions per the datasheet's DC characteristics table.

Does the MC9S08PA8VWJR support in-circuit debugging?

Yes, the MC9S08PA8VWJR includes a single-wire background debug interface (BKGD) that enables full in-circuit debugging, including breakpoint setting, register inspection, and flash programming. The on-chip ICE debug module provides two comparators and nine trigger modes, allowing real-time trace and complex conditional breakpoints during development and field validation of MC9S08PA8VWJR-based systems.

How many ADC channels does the MC9S08PA8VWJR have, and what is their resolution?

The MC9S08PA8VWJR features a 12-bit successive approximation ADC with up to 12 input channels. However, in the 20-pin SOIC package (WJ), only 10 channels are accessible due to pin count limitations - specifically ADP0 through ADP9. The ADC achieves 2.5 µs conversion time, supports hardware triggering, data buffering with watermark, and includes an internal bandgap reference for stable measurements independent of supply voltage.

What power-saving modes are available on the MC9S08PA8VWJR?

The MC9S08PA8VWJR offers multiple low-power modes, including Wait mode (clock gated but CPU halted) and Stop3 mode (only 1 kHz LPO clock active), which draws ~1.35 µA typical at 5 V. Peripheral clocks can be selectively disabled via the SIM module to further reduce current. The device also supports reduced-power wait mode and peripheral-specific clock gating - enabling fine-grained power optimization in battery-powered or thermally constrained MC9S08PA8VWJR applications.

Is the MC9S08PA8VWJR pin-compatible with the MC9S08PA16 series?

No, the MC9S08PA8VWJR is not fully pin-compatible with MC9S08PA16 variants due to differences in peripheral mapping and pin count. While both share the same 20-pin SOIC (WJ) package option, the MC9S08PA8VWJR has fewer ADC channels (10 vs. 12) and reduced FTM channel count in certain configurations. Pin assignments for shared signals (e.g., PTA0–PTA5, PTB0–PTB1) match, but unused pins differ - requiring schematic and layout verification before substitution.