NXP Semiconductors MC9S08AC128CFUE

Overview

MC9S08AC128CFUE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 128 KB flash, 8 KB RAM, 40-MHz CPU core, 16-channel 10-bit ADC, dual SCI modules supporting LIN 2.0/SAE J2602, and integrated TPM/PWM, SPI, I²C, and KBI peripherals. It targets automotive body control, industrial sensor nodes, and low-cost embedded control requiring robust debug support and mixed-signal integration.

For engineers reviewing the MC9S08AC128CFUE datasheet, MC9S08AC128CFUE pinout, MC9S08AC128CFUE application, or MC9S08AC128CFUE equivalent, key selection criteria include its 48-pin QFN package with exposed thermal pad, 2.7–5.5 V operation, -40°C to +125°C automotive-grade temperature range, on-chip background debug (BDC), and COP/CRC/LVD system protection features.

Technical Context

The MC9S08AC128CFUE implements the enhanced HCS08 CPU core with linear address pointer and memory management unit for paged memory access. Its internal clock generation (ICG) supports crystal, resonator, external clock, or precision NVM-trimmed internal oscillator - enabling flexible timing without external components in cost-sensitive designs.

Peripherals are tightly integrated via a unified bus architecture: two SCIs provide LIN-compliant wake-up and break handling; one full-duplex and one master-only SPI support daisy-chain sensor interfaces; the I²C module operates up to 100 kbps with multi-master and broadcast capability; and three TPM modules deliver up to 14 PWM channels with buffered center-aligned mode.

Key Specifications

Pinout & Package

MC9S08AC128CFUE is packaged in a 48-pin QFN (98ASA00466D) with 7×7 mm body, 0.5 mm pitch, and exposed thermal pad. The package supports copper-wire interconnect per Freescale QFN migration addendum Rev. 0 (2014).

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9KEAZ128AMLH and MC9S08DZ128MLH, the MC9S08AC128CFUE delivers optimal balance of LIN-native communication, compact 48-pin QFN packaging, and proven automotive qualification - making it the preferred choice for cost-sensitive, space-constrained body electronics where CAN is unnecessary.

Availability

MC9S08AC128CFUE is available at Aetrix Electronics and suitable for automotive body control, industrial sensor nodes, smart lighting controllers, and appliance motor drives requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC9S08AC128CFUE 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, IoT, mobile, and communication infrastructure markets.

The MC9S08AC128CFUE belongs to the HCS08 MCU family designed specifically for cost-optimized, high-reliability automotive and industrial control applications - emphasizing LIN protocol compliance, extended temperature operation, and integrated system-level protection features.

FAQ

What is the maximum operating frequency of the MC9S08AC128CFUE CPU core?

The MC9S08AC128CFUE features an enhanced HCS08 CPU core rated for a maximum frequency of 40 MHz, with a corresponding internal bus frequency of 20 MHz. This timing is guaranteed across the full operating voltage range (2.7–5.5 V) and temperature range (-40°C to +125°C), enabling deterministic real-time control in demanding automotive environments. The MC9S08AC128CFUE achieves this performance while maintaining low power consumption in active and stop modes.

Does the MC9S08AC128CFUE support LIN 2.0 protocol natively?

Yes, the MC9S08AC128CFUE includes two serial communications interface (SCI) modules explicitly qualified for LIN 2.0 and SAE J2602 protocols. Each SCI provides hardware support for master extended break generation and slave extended break detection, along with wakeup-on-active-edge functionality - eliminating software overhead and ensuring protocol compliance without external transceivers. This native support is documented in the MC9S08AC128 data sheet Rev. 4 (2011).

What package type and thermal characteristics apply to the MC9S08AC128CFUE?

The MC9S08AC128CFUE uses a 48-pin QFN package (document number 98ASA00466D) with 7×7 mm body, 0.5 mm pitch, and exposed thermal pad. Its junction-to-ambient thermal resistance (θJA) is 28°C/W on a four-layer board (2s2p), enabling reliable operation at 125°C ambient when dissipating up to ~120 mW. This package replaced earlier gold-wire versions with copper-wire interconnect per Freescale's QFN migration addendum (Rev. 0, 2014).

How does the MC9S08AC128CFUE handle low-voltage conditions?

The MC9S08AC128CFUE integrates a configurable low-voltage detection (LVD) system with separate high-range (4.2–4.5 V) and low-range (2.48–2.7 V) thresholds, plus hysteresis of 60–100 mV. It can generate either an interrupt or a reset when VDD falls below the selected threshold - preventing undefined behavior during battery sag or cold-cranking in automotive systems. The LVD circuit is factory-trimmed and operates independently of the main clock source.

Can the MC9S08AC128CFUE be programmed and debugged in-circuit?

Yes, the MC9S08AC128CFUE includes a fully integrated background debug controller (BDC) accessible via the BKGD/MS pin. This single-wire interface supports flash programming, real-time register inspection, single breakpoint setting, and trace data capture through an eight-deep FIFO - enabling full in-circuit debugging without external emulators. The on-chip debug module also includes three comparators and nine trigger modes for complex event analysis.