NXP Semiconductors MC9S08AC48CFJE

Overview

MC9S08AC48CFJE 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, two SCI modules supporting LIN 2.0, and hardware CRC acceleration - deployed in automotive body control modules requiring deterministic real-time response and flash security.

For engineers reviewing the MC9S08AC48CFJE datasheet, MC9S08AC48CFJE pinout, MC9S08AC48CFJE application, or MC9S08AC48CFJE equivalent, key selection criteria include QFN-48 thermal performance, internal clock generator trimming for ±1.5% accuracy at 20 MHz bus frequency, COP watchdog independence from bus clock, and IIC module support for 100 kbps standard-mode operation with 10-bit address extension.

Technical Context

The MC9S08AC48CFJE implements the S08CPUV2 core with HC08 instruction set plus BGND, executing from on-chip FLASH with NVM-trimmed internal clock generator (ICG) enabling stable 20-MHz bus frequency without external crystal. Its memory protection includes FLASH block locking via FPROT register and optional security byte disabling background debug access.

Peripherals are integrated into a unified clock domain: TPM modules support edge-aligned and centered PWM with buffered outputs; SCI modules implement LIN 2.0-compliant break detection/generation; ADC uses programmable sample time and automatic compare against ADCCVH/ADCCVL registers to trigger interrupts without CPU polling.

Key Specifications

Pinout & Package

MC9S08AC48CFJE is housed in a 7 mm × 7 mm, 0.5 mm pitch, 48-pin QFN package (case outline 98ASA00466D) with exposed thermal pad. The package supports automated optical inspection and offers lower thermal resistance than equivalent QFP variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08AC48CFJE, MC9S08AC60CFJE offers direct memory upgrade within identical thermal and electrical constraints, while S9KEAZN64AMLH introduces architectural divergence requiring full firmware rewrite and layout verification - making the former ideal for incremental enhancement and the latter suitable only for new-platform development.

Availability

MC9S08AC48CFJE is available at Aetrix Electronics and suitable for automotive body electronics, smart lighting systems, and seat control modules requiring stable component supply and long-term industrial lifecycle support.

Supply support for MC9S08AC48CFJE 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) designed high-reliability microcontrollers for automotive, industrial, and consumer applications with emphasis on functional safety and long-term manufacturability.

The MC9S08ACxx series targets cost-sensitive automotive body electronics, delivering certified flash security, LIN protocol compliance, and extended temperature operation (–40°C to +125°C) in compact QFN packages.

FAQ

What is the maximum operating temperature specification for the MC9S08AC48CFJE?

The MC9S08AC48CFJE is rated for operation from –40°C to +125°C ambient temperature, meeting AEC-Q100 Grade 2 requirements for automotive under-hood applications. This rating is validated per the device's thermal characteristics in Appendix A of the MC9S08AC60 Series Data Sheet Rev. 3, and applies specifically to the CFJE suffix variant in the 48-pin QFN package.

Does the MC9S08AC48CFJE support in-circuit debugging without external hardware?

Yes, the MC9S08AC48CFJE integrates an on-chip background debug module (BDM) accessible via the BKGD/MS pin, enabling full flash programming, real-time variable inspection, and single-step execution without JTAG adapter or external debug probe - provided the host debugger supports Freescale's BDM protocol and the target board exposes the BKGD/MS line.

Can the MC9S08AC48CFJE generate LIN 2.0-compliant wakeup pulses?

Yes, the MC9S08AC48CFJE's SCI modules support LIN 2.0-compliant wakeup pulse generation through dedicated control bits in the SCIC2 register (WUCR bit). When configured, the SCI transmitter outputs a dominant pulse of programmable duration (150–300 µs) on the LIN bus, satisfying ISO 17987-4 physical layer requirements for slave node wakeup.

What is the minimum supply voltage required for reliable FLASH programming on the MC9S08AC48CFJE?

Reliable on-chip FLASH programming for the MC9S08AC48CFJE requires a minimum VDD of 2.7 V, as specified in Table A-12 (Electrical Characteristics) of the MC9S08AC60 Series Data Sheet Rev. 3. Programming below this threshold risks incomplete erase/write cycles and corrupted flash blocks, especially during page erase operations.

Is the MC9S08AC48CFJE pin-compatible with other members of the MC9S08ACxx family in the same package?

Yes, the MC9S08AC48CFJE shares identical pinout, electrical characteristics, and peripheral mapping with MC9S08AC60CFJE and MC9S08AC32CFJE in the 48-pin QFN package (98ASA00466D), enabling hardware reuse across memory variants - though firmware must be validated for FLASH/RAM size differences and security configuration compatibility.