NXP Semiconductors MC9S08QG4CFQE

Overview

MC9S08QG4CFQE from Freescale Semiconductor is an 8-bit HCS08 microcontroller with 4 KB FLASH, 256 bytes RAM, 20-MHz CPU, internal clock source (ICS) with FLL, and integrated peripherals including 8-channel 10-bit ADC, SCI, SPI, I²C, TPM, ACMP, and KBI - used in low-cost embedded control applications such as appliance motor interfaces and sensor signal conditioning.

For engineers reviewing the MC9S08QG4CFQE datasheet, MC9S08QG4CFQE pinout, MC9S08QG4CFQE application, or MC9S08QG4CFQE equivalent, key selection factors include its 16-pin QFN package, single-wire background debug interface, 12 GPIO + 1 input-only + 1 output-only pin configuration, 1–10 MHz bus frequency support, and low-voltage detection with reset/interrupt capability.

Technical Context

The MC9S08QG4CFQE implements the HCS08 CPU core with HC08 instruction set extension (including BGND), supporting up to 32 interrupt/reset sources and featuring an on-chip debug module with two comparators, nine trigger modes, and eight-deep FIFO for flow-event capture. Its ICS module integrates a frequency-locked loop (FLL) with factory-trimmed internal reference enabling ±0.2% resolution and ±2% deviation over voltage/temperature.

Peripherals include a hardware-triggerable 10-bit ADC with internal bandgap reference and temperature sensor, analog comparator with optional routing to TPM, and dual-channel timer/pulse-width modulator supporting edge-aligned and center-aligned PWM - all operating under three stop modes and wait mode for power-sensitive designs.

Key Specifications

Pinout & Package

MC9S08QG4CFQE is housed in a 16-pin quad flat no-lead (QFN) package with exposed thermal pad (98ASA00671D), measuring 4 mm × 4 mm × 0.85 mm, RoHS-compliant, and optimized for compact PCB layouts requiring thermal efficiency.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08QG8CFQE, the MC9S08QG4CFQE offers identical peripheral functionality and footprint but halves FLASH/RAM capacity for cost-sensitive volume production; versus S9KEAZ128AMLH, it avoids ARM licensing, toolchain complexity, and layout rework while meeting basic real-time control requirements.

Availability

MC9S08QG4CFQE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, smart lighting drivers, and medical diagnostic handsets requiring stable component supply and long-term manufacturing continuity.

Supply support for MC9S08QG4CFQE 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) was a leading designer of embedded processors, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08QG4CFQE belongs to the HCS08 microcontroller family, engineered for cost-sensitive, low-power 8-bit control applications where small footprint, integrated analog peripherals, and single-wire debug are essential.

FAQ

What is the package type and dimensions of the MC9S08QG4CFQE?

The MC9S08QG4CFQE uses a 16-pin QFN package (case outline 98ASA00671D) measuring 4 mm × 4 mm × 0.85 mm with an exposed thermal pad. It is RoHS-compliant and designed for high-density PCB layouts requiring efficient heat dissipation in space-constrained applications like handheld devices and sensor modules.

Does the MC9S08QG4CFQE support in-circuit debugging, and what interface is used?

Yes, the MC9S08QG4CFQE supports in-circuit debugging via a single-wire background debug (BDM) interface. This allows real-time bus capture, breakpoint setting (one tag + two force), and on-chip emulation without requiring additional pins or headers - enabling rapid development and field firmware updates directly through the BKGD/MS pin.

What are the supported clock sources for the MC9S08QG4CFQE, and how precise is the internal oscillator?

The MC9S08QG4CFQE supports both the Internal Clock Source (ICS) with FLL and the External Oscillator (XOSC). The ICS achieves ±0.2% resolution and ±2% deviation over temperature and voltage due to factory trimming of its internal reference, delivering stable 1–10 MHz bus frequencies without external crystals.

Can the MC9S08QG4CFQE operate in low-power modes, and which peripherals remain active in Stop3 mode?

Yes, the MC9S08QG4CFQE supports Wait, Stop1, Stop2, and Stop3 modes. In Stop3 mode, the ADC, TPM, KBI, and RTI remain functional and can wake the MCU; the ICS is disabled but the 1-kHz COP clock continues, allowing watchdog supervision without full CPU activation.

Is there an internal temperature sensor in the MC9S08QG4CFQE, and how is it accessed?

Yes, the MC9S08QG4CFQE includes an on-die temperature sensor connected to ADC channel AD7. It is accessed by configuring the ADC to sample that channel with internal bandgap reference - enabling accurate ambient temperature monitoring without external components, ideal for thermal management in battery-powered or sealed systems.