NXP Semiconductors MCHC908QT1VDWE

Overview

MCHC908QT1VDWE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 1 KB FLASH, 64 bytes RAM, and integrated 8-channel 8-bit ADC. It operates at up to 8 MHz bus frequency using an internal trimmed RC oscillator, supports WAIT/STOP low-power modes, and targets cost-sensitive embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MCHC908QT1VDWE datasheet, MCHC908QT1VDWE pinout, MCHC908QT1VDWE application, or MCHC908QT1VDWE equivalent, key selection criteria include its 8-pin SOIC-W package, single-supply 2.7–5.5 V operation, on-chip COP watchdog, keyboard interrupt capability, and lack of UART or SPI peripherals-making it suitable for simple I/O and analog monitoring tasks where minimal footprint and BOM count are critical.

Technical Context

The MCHC908QT1VDWE implements the HCS08 CPU core with 16-bit address space, executes instructions from on-chip FLASH, and uses a 2-stage pipeline for improved throughput over legacy HC08. Its memory map includes 1 KB of user-programmable FLASH with block protection, 64 bytes of RAM, and dedicated I/O register space starting at $0000.

It integrates a 12-bit oscillator trim register (OSCTRIM) enabling ±2% accuracy of the internal RC clock across temperature and voltage, a 4-channel KBI module supporting wake-up from STOP mode via external keypad inputs, and a Low-Voltage Inhibit (LVI) circuit with programmable trip points (2.5 V or 3.5 V) for brown-out detection and reset generation.

Key Specifications

Pinout & Package

Package: 8-pin SOIC-W (Wide), 3.9 mm body width, 1.27 mm pitch - compatible with standard surface-mount reflow processes and manual prototyping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CSC and STM8S003F3P6, the MCHC908QT1VDWE offers the lowest BOM cost and smallest footprint for pure I/O + basic analog sensing, trading off memory, peripherals, and package compatibility for minimal system complexity.

Availability

MCHC908QT1VDWE is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance control subsystems, and portable diagnostic tools requiring stable component supply and long-term manufacturability.

Supply support for MCHC908QT1VDWE 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 Philips' semiconductor division, now specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The MCHC908QT1VDWE belongs to the legacy HC08 family, designed specifically for cost-optimized, low-pin-count embedded control in appliances, sensors, and consumer electronics where minimal code size and ultra-low power consumption are prioritized over communication interfaces.

FAQ

What is the maximum operating frequency of the MCHC908QT1VDWE?

The MCHC908QT1VDWE supports a maximum bus clock frequency of 8 MHz when using the internal trimmed RC oscillator. This corresponds to approximately 4 million instructions per second (MIPS) due to the HCS08 core's 2-cycle instruction execution architecture. External crystal operation is supported up to 8 MHz, but the internal oscillator is factory-trimmed to deliver ±2% accuracy across voltage and temperature without external components.

Does the MCHC908QT1VDWE include a hardware UART or SPI interface?

No, the MCHC908QT1VDWE does not include a hardware UART, SPI, or I²C interface. It relies solely on bit-banged GPIO for serial communication if required. Its peripheral set is intentionally minimal-featuring only an 8-bit ADC, KBI, COP watchdog, and LVI-making it suitable for applications where discrete I/O and basic analog sensing are primary requirements, and communication is handled by a separate master controller.

How much FLASH memory is available on the MCHC908QT1VDWE, and is it reprogrammable in-circuit?

The MCHC908QT1VDWE contains 1 KB of on-chip FLASH memory that is fully reprogrammable in-system via the single-wire background debug interface (BDM). No external high-voltage programming supply is needed. The FLASH supports page erase (64 bytes), mass erase, and software-controlled block protection for the top 64-byte sector containing reset and interrupt vectors-ensuring safe field firmware updates.

Can the MCHC908QT1VDWE wake up from STOP mode using external signals?

Yes, the MCHC908QT1VDWE can wake up from STOP mode using two dedicated keyboard interrupt inputs (KBI0 and KBI1) mapped to PTA1 and PTA2. These pins support configurable edge detection (rising/falling) and generate an interrupt request that restores full operation. Additionally, the IRQ pin (PTA0) can serve as a general-purpose external interrupt source for wake-up, though it lacks the dedicated KBI hardware filtering and low-power efficiency.

What package type and pin count does the MCHC908QT1VDWE use?

The MCHC908QT1VDWE is packaged in an 8-pin SOIC-W (Wide-body Small Outline Integrated Circuit) with 3.9 mm body width and 1.27 mm lead pitch. This RoHS-compliant package is industry-standard, compatible with automated SMT assembly and hand-soldering, and optimized for minimal PCB area in space-constrained designs such as sensor modules and appliance control boards.