NXP Semiconductors MC9S08QG8CFKE

Overview

MC9S08QG8CFKE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 20-MHz CPU, 8 KB Flash/512 B RAM, internal clock source with FLL, and integrated peripherals including 10-bit ADC, SCI, SPI, I²C, TPM, ACMP, and KBI. It operates across industrial temperature range (–40°C to +105°C) in a 16-pin QFN package and targets cost-sensitive embedded control applications such as motor drive supervision and sensor interface modules.

For engineers reviewing the MC9S08QG8CFKE datasheet, MC9S08QG8CFKE pinout, MC9S08QG8CFKE application, or MC9S08QG8CFKE equivalent, key selection criteria include its single-wire background debug interface, copper-wire QFN package (98ASA00671D), 12 GPIO + 1 input-only + 1 output-only pin configuration, and support for Wait/Stop1/Stop2/Stop3 low-power modes - all critical for space-constrained, battery-aware designs.

Technical Context

The MC9S08QG8CFKE implements the S08CPUV2 core with HC08 instruction set extension (BGND), on-chip debug module with two comparators and eight-deep FIFO, and supports up to 32 interrupt/reset sources. Its ICS module delivers bus frequencies from 1 MHz to 10 MHz using FLL with factory-trimmed internal reference (±2% deviation over voltage/temperature).

Peripherals are tightly coupled to power management: ADC supports hardware triggering via RTI counter; ACMP output can route to TPM for event-driven timing; and KBI provides 8-pin keyboard interrupt with software-selectable edge/level polarity. All I/O pins feature configurable pullups, slew rate, and drive strength - enabling direct interface with mechanical switches, analog sensors, and digital logic without external components.

Key Specifications

Pinout & Package

MC9S08QG8CFKE is housed in a 16-pin quad flat no-lead (QFN) package with exposed thermal pad (case outline 98ASA00671D), using copper wire bonding per Freescale QFN migration addendum (Rev. 0, 07/2014). Dimensions: 4 mm × 4 mm × 0.85 mm, pitch: 0.65 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08QG8CFKE, MC9S08QG4CFKE trades memory headroom for cost reduction in fixed-function applications, while S9S08QG8JFKE offers identical performance with enhanced lifecycle assurance through NXP's extended product roadmap and qualification reporting.

Availability

MC9S08QG8CFKE is available at Aetrix Electronics and suitable for motor control supervision, sensor signal conditioning, industrial keypad interface, and low-power remote sensor node applications requiring stable component supply and long-term industrial temperature support (–40°C to +105°C).

Supply support for MC9S08QG8CFKE 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 was a U.S.-based semiconductor company specializing in embedded processors, analog, and connectivity solutions before its acquisition by NXP Semiconductors in 2015. It pioneered the HCS08 architecture for cost-optimized industrial control.

The MC9S08QG8CFKE belongs to the HCS08 QG-series microcontrollers, designed specifically for ultra-low-cost, space-constrained embedded systems requiring integrated analog peripherals, robust debug, and extended temperature operation - not general-purpose computing.

FAQ

What is the maximum operating frequency of the MC9S08QG8CFKE CPU core?

The MC9S08QG8CFKE features an HCS08 S08CPUV2 core rated for up to 20 MHz operation. This maximum frequency is achievable when the internal clock source (ICS) is configured with appropriate FLL settings and external conditions (voltage, temperature) remain within specification limits (2.7–5.5 V, –40°C to +105°C). Bus frequency is derived from the core clock and may be divided down for peripheral synchronization.

Does the MC9S08QG8CFKE support in-circuit debugging without additional hardware?

Yes, the MC9S08QG8CFKE supports single-wire background debug via the BKGD/MS pin, requiring only a level-shifter circuit for host connection - no external debugger IC or JTAG header needed. The on-chip debug module includes breakpoint comparators, event-triggered trace, and real-time bus capture, enabling full firmware inspection and modification during live operation.

What package type and dimensions does the MC9S08QG8CFKE use?

The MC9S08QG8CFKE uses a 16-pin QFN package with exposed thermal pad (case outline 98ASA00671D), measuring 4.0 mm × 4.0 mm × 0.85 mm with 0.65 mm pitch. It employs copper wire bonding per Freescale's QFN migration program (document QFN_Addendum Rev. 0, 07/2014), replacing earlier gold-wire variants for improved reliability and cost efficiency.

Can the MC9S08QG8CFKE operate from a single 3.3 V supply?

Yes, the MC9S08QG8CFKE operates across a supply range of 2.7 V to 5.5 V, making it fully compatible with standard 3.3 V systems. All I/O pins are 5 V tolerant when configured as inputs, and internal regulators ensure stable ADC reference and CPU timing at 3.3 V - confirmed in DC characteristics tables (Appendix A, Rev. 5 datasheet).

How many analog input channels does the ADC in the MC9S08QG8CFKE support?

The MC9S08QG8CFKE integrates an 8-channel, 10-bit successive approximation register (SAR) ADC. Channels map to PTA0–PTA5 and PTB0–PTB1 pins, with one dedicated internal temperature sensor channel and optional internal bandgap reference input - enabling simultaneous monitoring of up to eight external analog signals without multiplexer hardware.