NXP Semiconductors MCHC908JW32FAE

Overview

MCHC908JW32FAE from Freescale Semiconductor is a 8-bit HCS08 core microcontroller with 32 KB on-chip Flash, 1.5 KB RAM, and integrated USB 2.0 Full-Speed interface. It features a PLL-based clock generator supporting up to 20 MHz CPU operation, 48-pin QFN package, and operates from 2.7–5.5 V supply. Designed for embedded USB peripheral control in industrial and consumer devices.

For engineers reviewing the MCHC908JW32FAE datasheet, MCHC908JW32FAE pinout, MCHC908JW32FAE application, or MCHC908JW32FAE equivalent, key selection criteria include USB FS compliance, Flash endurance (100k erase/write cycles), PLL lock time (<10 ms), 48-pin QFN thermal performance, and monitor-mode debug support via UART/USB.

Technical Context

The MCHC908JW32FAE implements the HCS08 CPU core with 16-bit address space, 8-level hardware stack, and instruction set compatible with HC08 family. Its Clock Generator Module (CGM) integrates crystal oscillator, PLL (×1–×32 multiplier), and programmable bandwidth filter for jitter-sensitive USB timing.

System Integration Module (SIM) provides reset management (POR, LVI, COP, USB), interrupt prioritization across 24 sources, and low-power modes (Wait/Stop). The USB 2.0 FS module supports 12 Mbps data rate, 16 endpoints (including control, bulk, interrupt), and internal transceiver compliant with USB Specification Rev. 2.0.

Key Specifications

Pinout & Package

48-pin QFN package (case outline 98ASA00466D), 7 × 7 mm body, 0.5 mm pitch, thermally enhanced exposed pad (EPAD) connected to VSS for improved heat transfer and EMI suppression.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller-with-integrated-USB applications.

Compared with MC9S08JB16 and MC9S08UN16, the MCHC908JW32FAE uniquely combines 32 KB Flash, full-speed USB PHY, and PLL-based 20 MHz operation in a single 48-pin QFN - enabling feature-rich, self-contained USB device designs without external timing or interface components.

Availability

MCHC908JW32FAE is available at Aetrix Electronics and suitable for industrial sensor nodes, USB HID peripherals, factory automation controllers, and USB-to-serial bridges requiring stable component supply and long-term manufacturability.

Supply support for MCHC908JW32FAE 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) is a fabless semiconductor company specializing in microcontrollers, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MCHC908JW32FAE belongs to the HCS08 USB microcontroller family, designed specifically for cost-sensitive, space-constrained USB peripheral applications requiring integrated timing, power efficiency, and field-upgradable firmware.

FAQ

What is the maximum operating frequency of the MCHC908JW32FAE CPU core?

The MCHC908JW32FAE CPU core operates at up to 20 MHz, achieved via its integrated PLL with programmable multiplier (×1 to ×32) and reference divider. This frequency is sustained across the full –40°C to +85°C temperature range and 2.7–5.5 V supply, enabling deterministic real-time execution for USB-synchronized tasks and sensor sampling loops in the MCHC908JW32FAE.

Does the MCHC908JW32FAE include an integrated USB transceiver?

Yes, the MCHC908JW32FAE integrates a full-speed USB 2.0 transceiver compliant with USB Specification Rev. 2.0. It supports 12 Mbps data rate, includes internal 1.5 kΩ pull-up on USB_DP, and requires no external transceiver IC or termination resistors - simplifying layout and reducing BOM cost for USB device implementations using the MCHC908JW32FAE.

What debug and programming interfaces does the MCHC908JW32FAE support?

The MCHC908JW32FAE supports Monitor Mode ROM-based programming via UART or USB, enabling in-field firmware updates without JTAG hardware. It also supports background flash programming and mass erase operations. While it lacks dedicated JTAG pins, the MCHC908JW32FAE's built-in bootloader provides reliable, low-cost development and maintenance capability.

What is the Flash memory endurance specification for the MCHC908JW32FAE?

The MCHC908JW32FAE Flash memory is rated for 100,000 erase/write cycles per block, verified across the full operating temperature range. This endurance supports robust firmware update strategies, including dual-bank swapping and wear-leveling algorithms implemented in application code running on the MCHC908JW32FAE.

Is the MCHC908JW32FAE pin-compatible with other HCS08 family members?

No, the MCHC908JW32FAE is not pin-compatible with other HCS08 microcontrollers. Its 48-pin QFN package (98ASA00466D) and specific pin assignments-including dedicated USB_DP/USB_DM, CGMXFC, and PLL-related signals-are unique to this device. Migration requires PCB redesign and firmware adaptation due to differences in peripheral mapping and register layout in the MCHC908JW32FAE.