NXP Semiconductors MC9S08QG84CDTE

Overview

MC9S08QG84CDTE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring a 20-MHz CPU, 8 KB Flash memory, 512 bytes RAM, and integrated peripherals including 10-bit ADC, SCI, SPI, I²C, TPM, ACMP, and MTIM. It operates across industrial temperature range (–40°C to +105°C) in a 16-pin QFN package with exposed thermal pad, targeting cost-sensitive embedded control applications such as motor drive supervision and sensor interface modules.

For engineers reviewing the MC9S08QG84CDTE datasheet, MC9S08QG84CDTE pinout, MC9S08QG84CDTE application, or MC9S08QG84CDTE equivalent, key selection criteria include its single-wire background debug interface, internal clock source with FLL and ±2% frequency stability over voltage/temperature, 12 GPIOs with configurable pullups/slew rate, and FLASH block protection for firmware integrity in field-deployed devices.

Technical Context

The MC9S08QG84CDTE 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 change-of-flow tracing. Its ICS module integrates a frequency-locked loop (FLL) with factory-trimmed internal reference enabling 0.2% resolution and ±2% deviation over full operating range.

Peripherals are tightly coupled to low-power operation: the ADC supports hardware triggering via RTI counter and includes internal bandgap reference and temperature sensor; the TPM provides dual-channel PWM with edge- and center-aligned modes; and the ACMP output can be routed directly to TPM for analog event-driven timing control - all functional in Wait mode and selectively retained in Stop1/Stop2 modes.

Key Specifications

Pinout & Package

MC9S08QG84CDTE is housed in a 16-pin quad flat no-lead (QFN) package (98ASA00671D) with 3 mm × 3 mm footprint and exposed thermal pad for enhanced thermal dissipation in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08QG8CDTE and S9KEAZ128AMLH, the MC9S08QG84CDTE delivers optimal balance of proven industrial reliability, minimal BOM count, and seamless integration with legacy Freescale BDM tools - making it ideal for cost-constrained, long-lifecycle embedded controllers where pin count and thermal profile are primary constraints.

Availability

MC9S08QG84CDTE is available at Aetrix Electronics and suitable for motor control supervision, sensor signal conditioning, industrial keypad interface, and low-power remote telemetry node applications requiring stable component supply and long-term industrial temperature support.

Supply support for MC9S08QG84CDTE 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, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9S08QG84CDTE belongs to the HCS08 microcontroller family, engineered for cost-sensitive, low-power industrial control applications demanding high reliability, integrated analog peripherals, and streamlined development with single-wire debug.

FAQ

What is the maximum operating frequency of the MC9S08QG84CDTE CPU core?

The MC9S08QG84CDTE features an HCS08 CPU core rated for up to 20 MHz operation. This frequency is achieved using the internal clock source (ICS) with FLL enabled and properly configured external or internal reference. Bus speed scales directly with core frequency, enabling deterministic real-time execution with sub-microsecond interrupt response - essential for time-critical motor control loops and sensor sampling routines in the MC9S08QG84CDTE.

Does the MC9S08QG84CDTE support in-system programming via its debug interface?

Yes, the MC9S08QG84CDTE supports full in-system programming (ISP) through its single-wire background debug (BDM) interface. Using standard Freescale BDM tools (e.g., DEMO9S08QG8 evaluation board with P&E Micro debugger), users can erase, program, and verify FLASH memory - including security byte configuration - without removing the MC9S08QG84CDTE from the target PCB. This capability is integral to field firmware updates and production programming workflows for the MC9S08QG84CDTE.

What analog reference options are available for the ADC in the MC9S08QG84CDTE?

The MC9S08QG84CDTE ADC supports multiple reference configurations: internal bandgap (1.22 V nominal), external VREFH/VREFL pins, or AVDD/AVSS. The internal bandgap reference is factory-trimmed and temperature-stable, enabling accurate ratiometric measurements without external components. This flexibility allows the MC9S08QG84CDTE to adapt to varying sensor output ranges and power supply conditions while maintaining measurement integrity across its –40°C to +105°C operating range.

How does the MC9S08QG84CDTE handle low-voltage conditions during operation?

The MC9S08QG84CDTE integrates a programmable low-voltage detect (LVD) system with four selectable thresholds (2.5 V, 2.7 V, 2.9 V, 3.1 V). When supply voltage drops below the chosen threshold, it can generate either a non-maskable interrupt or a hardware reset - configurable via SRS register bits. This feature ensures safe shutdown or graceful state preservation before brownout, protecting both system integrity and stored data in the MC9S08QG84CDTE's FLASH and RAM.

Is the MC9S08QG84CDTE pin-compatible with other members of the QG8 family?

No, the MC9S08QG84CDTE is not pin-compatible with other QG8 variants. It uses a 16-pin QFN package (98ASA00671D), whereas MC9S08QG8CDTE uses a 24-pin QFN (98ASA00474D), and MC9S08QG8CPBE uses a 16-pin TSSOP. Pin assignments differ across packages - for example, PTA5 serves as RESET on the 16-pin QFN but maps to different functions in larger packages. Migration between variants requires PCB layout revision and signal reassignment for the MC9S08QG84CDTE.