NXP Semiconductors MC9S08AC48CFDE

Overview

MC9S08AC48CFDE from Freescale Semiconductor is an 8-bit HCS08 microcontroller in a 48-pin QFN package, featuring a 40-MHz CPU core, 48 KB on-chip FLASH, 1.5 KB RAM, 10-bit ADC with 16 channels, and dual SCI modules supporting LIN 2.0. It targets automotive body control modules requiring robust debug support and low-voltage operation.

For engineers reviewing the MC9S08AC48CFDE datasheet, MC9S08AC48CFDE pinout, MC9S08AC48CFDE application, or MC9S08AC48CFDE equivalent, key selection criteria include its 48-pin QFN copper-wire package (98ASA00466D), integrated IIC/SPI/TPM peripherals, background debugging system with ICE module, and COP watchdog with independent 1 kHz clock source.

Technical Context

The MC9S08AC48CFDE implements the S08CPUV2 core with HC08 instruction set extension (BGND), operating at up to 40 MHz CPU frequency and 20 MHz bus frequency. Its internal clock generator (ICG) supports precision NVM-trimmed internal reference with crystal/resonator/external clock options.

It integrates two SCI modules compliant with LIN 2.0 and SAE J2602, one IIC module (up to 100 kbps), one SPI module, and three TPM timer modules - two 2-channel and one 6-channel - supporting input capture, output compare, edge-aligned and centered PWM. The CRC module provides hardware-accelerated 16-bit checksum generation.

Key Specifications

Pinout & Package

MC9S08AC48CFDE is housed in a 48-pin QFN package (case outline 98ASA00466D), measuring 7 mm × 7 mm × 0.85 mm, with an exposed thermal pad for improved heat dissipation in automotive environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC60CFDE, the MC9S08AC48CFDE offers reduced FLASH/RAM but identical peripheral functionality and footprint - ideal for cost-optimized BCM variants. Versus S9KEAZ128AMLH, it provides proven HCS08 toolchain continuity and lower power in wait/stop modes, though without CAN or floating-point capability.

Availability

MC9S08AC48CFDE is available at Aetrix Electronics and suitable for automotive body electronics, LIN-based sensor networks, and industrial control panels requiring stable component supply across extended temperature ranges (–40°C to +105°C).

Supply support for MC9S08AC48CFDE 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

Freescale Semiconductor (now part of NXP Semiconductors since 2015) was a leading designer of embedded processors and analog devices for automotive, industrial, and networking markets.

The MC9S08AC48CFDE belongs to the HCS08 AC-series microcontrollers, engineered specifically for cost-sensitive, high-reliability automotive body electronics where LIN communication, low-power operation, and on-chip debug are mandatory.

FAQ

What is the package type and thermal pad configuration of the MC9S08AC48CFDE?

The MC9S08AC48CFDE uses a 48-pin QFN package (case outline 98ASA00466D) with an exposed thermal pad. This copper-wire bonded package measures 7 mm × 7 mm × 0.85 mm and requires soldering the thermal pad to a PCB copper pour for optimal thermal performance in automotive under-hood applications. The pad is internally connected to VSS.

Does the MC9S08AC48CFDE support LIN 2.0 communication natively?

Yes, the MC9S08AC48CFDE supports LIN 2.0 natively through its two SCI modules. Each SCI includes master extended break generation and slave extended break detection circuitry, meeting SAE J2602 requirements. No external LIN transceiver configuration logic is needed - only a standard LIN physical layer transceiver (e.g., TJA1020) is required.

What debug capabilities does the MC9S08AC48CFDE provide during in-circuit development?

The MC9S08AC48CFDE integrates a full background debug system (BDM) with on-chip in-circuit emulator (ICE). It supports single breakpoint setting, two additional breakpoints in the ICE module, eight-deep FIFO for change-of-flow tracing, and tag/force breakpoint modes - all accessible via the BKGD/MS pin without requiring external debug probes beyond a standard BDM interface cable.

How does the internal clock generator (ICG) of the MC9S08AC48CFDE ensure timing accuracy without an external crystal?

The MC9S08AC48CFDE's ICG module uses factory-trimmed NVM to calibrate an internal RC oscillator, achieving ±2% accuracy over –40°C to +105°C. This allows crystal-free operation for non-critical timing functions like UART baud generation or PWM base periods, reducing BOM cost while retaining option to use XTAL/EXTAL for LIN synchronization when higher precision is required.

Can the MC9S08AC48CFDE operate in low-voltage conditions typical of automotive battery droop?

Yes, the MC9S08AC48CFDE features a programmable low-voltage detect (LVD) system with reset or interrupt capability down to 2.7 V. It also supports operation at VDD = 2.7–5.5 V, enabling reliable function during cold-crank events (e.g., 6 V battery sag) and compatibility with 12 V and 24 V vehicle electrical systems without external regulators.