NXP Semiconductors MC9S08AC128CFGER

Overview

MC9S08AC128CFGER from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller featuring a 40-MHz CPU, 128 KB on-chip FLASH, 8 KB RAM, and integrated peripherals including dual SCI (LIN/J2602 compliant), triple TPM, 16-channel 10-bit ADC, I²C, SPI, and KBI. It targets automotive body control modules requiring robust diagnostics, low-voltage operation, and ASIL-B–capable system monitoring.

For engineers reviewing the MC9S08AC128CFGER datasheet, MC9S08AC128CFGER pinout, MC9S08AC128CFGER application, or MC9S08AC128CFGER equivalent, key selection criteria include its 48-pin QFN package with exposed thermal pad, -40°C to +125°C operating range, COP/CRC/LVD safety features, and support for LIN 2.0 protocol stack integration in cost-sensitive automotive ECUs.

Technical Context

The MC9S08AC128CFGER implements the enhanced HCS08 core with linear address pointer and memory management unit for paged memory access. Its internal clock generation (ICG) supports crystal/resonator/external clock inputs with NVM-trimmed precision, enabling stable bus frequencies up to 20 MHz.

Peripheral integration includes two full-duplex SCI modules with master/slave extended break handling for LIN communication, one full and one master-only SPI, I²C supporting 100 kbps and 10-bit addressing, and three timer/PWM modules (TPM1: 6-channel, TPM2: 6-channel, TPM3: 2-channel) with selectable input capture, output compare, and edge-aligned or centered PWM modes.

Key Specifications

Pinout & Package

MC9S08AC128CFGER is packaged in a 48-pin QFN (98ASA00466D) with 7 mm × 7 mm footprint and exposed thermal pad. The package uses copper wire bonding 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 S9S08AC128F1MLF and MC9S08AW60CFUE, the MC9S08AC128CFGER delivers optimal balance of I/O density, memory size, and thermal performance in the 48-pin QFN form factor-making it ideal for space-constrained automotive nodes requiring full feature set without package upgrade.

Availability

MC9S08AC128CFGER is available at Aetrix Electronics and suitable for automotive body control modules, door electronics, seat position memory units, and roof modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC9S08AC128CFGER 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 heritage in microcontrollers originating from Freescale.

The MC9S08AC128CFGER belongs to the HCS08 family designed specifically for cost-sensitive, high-reliability automotive body electronics where functional safety, LIN protocol compliance, and extended temperature operation are mandatory.

FAQ

What is the maximum operating frequency of the MC9S08AC128CFGER CPU core?

The MC9S08AC128CFGER features an enhanced HCS08 CPU core rated for up to 40 MHz operation. This allows sub-25 ns instruction cycle times, supporting deterministic real-time control loops in automotive applications such as window lift timing and LIN message scheduling. Bus frequency is limited to 20 MHz, and actual achievable CPU speed depends on flash wait states and ICG configuration.

Does the MC9S08AC128CFGER support LIN 2.0 protocol natively?

Yes, the MC9S08AC128CFGER includes two SCI modules fully compliant with LIN 2.0 and SAE J2602 standards. Each SCI supports master extended break generation and slave extended break detection, enabling seamless integration into LIN cluster networks without external transceivers beyond physical layer components.

What package type and thermal characteristics apply to the MC9S08AC128CFGER?

The MC9S08AC128CFGER uses a 48-pin QFN package (98ASA00466D) with 7 mm × 7 mm body and exposed thermal pad. Its junction-to-ambient thermal resistance (θJA) is 28°C/W on a 4-layer board, enabling reliable operation at 125°C ambient when the thermal pad is properly soldered to a solid ground plane.

How does the MC9S08AC128CFGER ensure functional safety in automotive systems?

The MC9S08AC128CFGER incorporates multiple hardware safety features: a configurable COP watchdog with independent clock source, CRC module for memory integrity checking, low-voltage detect with reset/interrupt, illegal opcode detection, and power-on reset circuitry. These elements collectively support ASIL-B–level system monitoring per ISO 26262 requirements in body control applications.

Can the MC9S08AC128CFGER operate from a 3.3 V supply while maintaining full peripheral functionality?

Yes, the MC9S08AC128CFGER operates across 2.7 V to 5.5 V, and all peripherals-including ADC, SCI, SPI, I²C, and TPM-are fully functional at 3.3 V. The internal bandgap reference (1.200 V ±30 mV) remains stable, and I/O drive strength is configurable to maintain noise margins at reduced voltage.