NXP Semiconductors MCHC908QT4VDWE

Overview

MCHC908QT4VDWE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB Flash, 192 B RAM, internal 32 MHz RC oscillator, 8-channel 10-bit ADC, and 16-pin SOIC-W package. It integrates COP watchdog, LVI reset protection, keyboard interrupt, and auto-wakeup for low-power embedded control in industrial sensors and appliance interfaces.

For engineers reviewing the MCHC908QT4VDWE datasheet, MCHC908QT4VDWE pinout, MCHC908QT4VDWE application, or MCHC908QT4VDWE equivalent, key selection criteria include Flash endurance (100k erase/write cycles), internal oscillator accuracy (±2% over temperature), ADC resolution (10-bit), IRQ/KBI interrupt latency (≤2 µs), and SOIC-W thermal performance (θ_JA = 90°C/W).

Technical Context

The MCHC908QT4VDWE implements the HCS08 CPU core with 16-bit address bus, supporting WAIT/STOP low-power modes and a 3-stage pipeline. Its memory map includes 4 KB on-chip Flash (block-erasable), 192 B RAM, and dedicated I/O register space at $0000–$00FF.

The integrated oscillator module provides selectable clock sources: internal RC (32 MHz ±2%), external crystal (up to 8 MHz), or external clock input. The ADC uses a successive-approximation architecture with programmable sample time and conversion trigger via software, timer, or external event.

Key Specifications

Pinout & Package

16-pin SOIC-W (Wide-body) package with 1.27 mm pitch, 7.5 mm body width, and exposed pad not present - standard plastic encapsulation for industrial-grade thermal dissipation (θ_JA = 90°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CPD and MC9S08QG4CDTE, the MCHC908QT4VDWE delivers superior low-power wake-up capability via AWU, guaranteed ±2% oscillator accuracy without external components, and native KBI support - making it optimal for cost-sensitive, battery-operated, or keypad-based industrial controls.

Availability

MCHC908QT4VDWE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control panels, and smart power outlets requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MCHC908QT4VDWE 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.

The MCHC908QT4VDWE belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control in appliances, sensors, and industrial equipment - emphasizing Flash reliability, integrated analog, and minimal external component count.

FAQ

What is the maximum operating frequency of the MCHC908QT4VDWE?

The MCHC908QT4VDWE supports a maximum bus clock frequency of 20 MHz when using the internal 32 MHz RC oscillator divided by 2, or up to 8 MHz when driven by an external crystal. Its HCS08 core executes instructions at one cycle per bus clock, enabling deterministic real-time response in control loops and interrupt handlers. The internal oscillator is factory-trimmed to ±2% accuracy across temperature and voltage.

Does the MCHC908QT4VDWE support in-circuit debugging?

Yes, the MCHC908QT4VDWE supports Monitor Mode debugging via a single-pin entry sequence on the RESET pin, eliminating the need for dedicated debug headers. This mode allows firmware download, register inspection, and breakpoint execution using standard UART-level communication. No external debugger hardware is required beyond a simple level-shifter for 3.3 V/5 V host interface.

How many ADC channels does the MCHC908QT4VDWE have, and what is their resolution?

The MCHC908QT4VDWE features an 8-channel, 10-bit successive-approximation ADC with programmable sample time and conversion triggers from software, timer overflow, or external events. Each channel supports single-ended input referenced to VDD/VSS, delivering 1024 discrete steps across the full supply range - sufficient for precision temperature sensing, battery voltage monitoring, and analog control signal acquisition.

What low-power modes are available on the MCHC908QT4VDWE?

The MCHC908QT4VDWE offers WAIT and STOP low-power modes. WAIT halts the CPU while preserving RAM and register contents, allowing fast wake-up (<1 µs) from IRQ, KBI, or AWU. STOP disables the oscillator and reduces current to <1 µA, retaining RAM and waking only on RESET, IRQ, or KBI - ideal for battery-powered applications requiring multi-day standby.

Is the MCHC908QT4VDWE pin-compatible with other members of the QY/QT family?

Yes, the MCHC908QT4VDWE shares identical pinout and register mapping with MC68HC908QT4, MC68HC908QT2, and MC68HC908QT1 in the 16-pin SOIC-W package. Firmware written for QT4 variants runs without modification, and PCB layouts support direct substitution - enabling scalable design across memory and feature tiers within the same footprint.