NXP Semiconductors MC9S08QD4VSC

Overview

MC9S08QD4VSC from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller with 16 MHz CPU, 4 KB Flash, 256 B RAM, and integrated ADC, dual timers, and keyboard interrupt module - used in cost-sensitive embedded control applications such as small appliance motor control and sensor interface modules.

For engineers reviewing the MC9S08QD4VSC datasheet, MC9S08QD4VSC pinout, MC9S08QD4VSC application, or MC9S08QD4VSC equivalent, key selection criteria include its 8-pin SOIC package, single-wire background debug interface, internal clock source with ±2% accuracy over voltage/temperature, and support for Wait + three Stop power modes.

Technical Context

The MC9S08QD4VSC implements the HCS08 CPU core with HC08 instruction set extension including BGND, supporting up to 32 interrupt/reset sources and hardware-triggered ADC conversions via RTI. Its ICS module uses a frequency-locked loop (FLL) with precision-trimmed internal reference for stable bus clock generation.

Peripherals include TIM1 (2-channel), TIM2 (1-channel), 4-channel 10-bit ADC with temperature sensor and bandgap reference, and KBI with software-selectable edge/level sensitivity on four pins - all operating under a unified low-voltage detection and COP watchdog system.

Key Specifications

Pinout & Package

MC9S08QD4VSC is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and rated for industrial temperature range (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08QD4VSC, MC9S08QG4CDTE adds ADC channels and resolution at the cost of larger footprint and higher price, while S9S08QD4F1VSC provides automotive qualification without functional change - making MC9S08QD4VSC optimal for industrial and consumer cost-sensitive designs.

Availability

MC9S08QD4VSC is available at Aetrix Electronics and suitable for small appliance motor control, industrial sensor interface, and smart power outlet applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MC9S08QD4VSC 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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Freescale Semiconductor and Philips' semiconductor division, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MC9S08QD4VSC belongs to the HCS08 QD-series - designed specifically for ultra-low-cost, space-constrained embedded control applications where minimal external components, single-wire debug, and integrated analog peripherals reduce total system complexity.

FAQ

What is the maximum operating frequency of the MC9S08QD4VSC?

The MC9S08QD4VSC features an HCS08 CPU core with a maximum bus clock frequency of 16 MHz. This is achieved using the internal clock source (ICS) with frequency-locked loop (FLL) - no external crystal is required. The actual instruction execution rate depends on the selected bus clock divider, but the core supports deterministic timing for real-time control tasks within this limit. MC9S08QD4VSC maintains timing accuracy across its full industrial temperature range.

Does the MC9S08QD4VSC include an internal temperature sensor?

Yes, the MC9S08QD4VSC integrates a factory-calibrated temperature sensor connected to its 10-bit ADC. It is accessible as a dedicated ADC channel and provides usable readings across the –40 °C to +85 °C operating range. The sensor output is referenced to the internal bandgap voltage, enabling ratiometric measurements without external references. This feature is documented in Section 8.1.2 of the MC9S08QD4VSC datasheet.

What debug interface does the MC9S08QD4VSC support?

The MC9S08QD4VSC supports a single-wire background debug (BDM) interface via the BKGD/MS pin. This allows in-circuit programming, real-time register inspection, and single-breakpoint debugging without halting system operation. The interface requires only one signal line plus ground, minimizing PCB routing overhead. MC9S08QD4VSC's BDM implementation complies with Freescale's standard protocol and is supported by CodeWarrior and compatible third-party tools.

Can the MC9S08QD4VSC operate from a single 3.3 V supply?

Yes, the MC9S08QD4VSC operates across a supply voltage range of 2.7 V to 5.5 V, fully supporting 3.3 V nominal systems. All I/O pins are 5 V tolerant when configured as inputs, and internal regulators ensure stable core voltage regardless of VDD level. The device maintains full functionality - including ADC accuracy, timer resolution, and debug interface - at 3.3 V. MC9S08QD4VSC's electrical characteristics are validated across this entire range per Appendix A of its datasheet.

Is the MC9S08QD4VSC pin-compatible with the S9S08QD4F1VSC?

Yes, the MC9S08QD4VSC and S9S08QD4F1VSC share identical 8-pin SOIC packaging, pin assignment, and electrical signaling - making them functionally interchangeable at the board level. The primary difference is automotive qualification: S9S08QD4F1VSC meets AEC-Q100 Grade 2 requirements (–40 °C to +125 °C), while MC9S08QD4VSC is rated for industrial temperature (–40 °C to +85 °C). MC9S08QD4VSC retains full feature parity in non-automotive environments.