NXP Semiconductors MCHC908QT1MDWE

Overview

MCHC908QT1MDWE 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 appliance motor interfaces and industrial sensor nodes.

For engineers reviewing the MCHC908QT1MDWE datasheet, MCHC908QT1MDWE pinout, MCHC908QT1MDWE application, or MCHC908QT1MDWE equivalent, key selection factors include its 16-pin SOIC-W package, single-supply 2.7–5.5 V operation, on-chip COP watchdog, LVI brown-out detection, and keyboard interrupt capability for touch-button interfaces.

Technical Context

The MCHC908QT1MDWE implements the HCS08 CPU core with 16-bit address space, Harvard architecture instruction fetch, and 3-stage pipeline. Its memory map includes 1 KB of on-chip FLASH (with block protection), 64 bytes of RAM, and dedicated I/O register space mapped to $0000–$00FF.

Peripheral integration includes a 16-bit Timer Interface Module (TIM) with input capture/output compare, Auto Wakeup Module (AWU) with programmable timeout, Low-Voltage Inhibit (LVI) with selectable trip points, and System Integration Module (SIM) managing clock distribution, reset sources, and interrupt vectoring.

Key Specifications

Pinout & Package

Package: 16-pin SOIC-W (Wide-body), 7.5 mm width, 1.27 mm pitch, JEDEC MS-013AC compliant. Thermal pad not present; standard surface-mount reflow profile applies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CPD and STM8S003F3P6, the MCHC908QT1MDWE offers factory-trimmed RC oscillator accuracy and integrated KBI at lower gate count - making it optimal for ultra-low-cost, low-pin-count touch and motor control where external timing components must be avoided.

Availability

MCHC908QT1MDWE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor nodes, consumer touch interfaces, and power tool battery management requiring stable component supply across long production lifecycles.

Supply support for MCHC908QT1MDWE 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 MCHC908QT1MDWE belongs to the legacy HCS08 microcontroller family designed for cost-sensitive, low-power embedded control in white goods, power tools, and industrial equipment.

FAQ

What is the maximum operating frequency of the MCHC908QT1MDWE?

The MCHC908QT1MDWE supports a maximum bus frequency of 8 MHz. This is achieved using the internal trimmed RC oscillator or an external crystal/resonator. The HCS08 core executes most instructions in 1–2 bus cycles, enabling deterministic real-time response in control loops without external clock multiplication.

Does the MCHC908QT1MDWE include a hardware watchdog timer?

Yes, the MCHC908QT1MDWE integrates a Computer Operating Properly (COP) watchdog module. It features configurable timeout intervals ranging from 0.5 ms to 1.0 s and requires periodic service via COPCTL register writes to prevent system reset - critical for fail-safe operation in MCHC908QT1MDWE-based safety-critical systems.

Can the MCHC908QT1MDWE operate without an external crystal?

Yes, the MCHC908QT1MDWE uses a factory-trimmed internal RC oscillator as the default clock source. No external crystal is required for basic operation. OSC1 and OSC2 pins may be left unconnected unless higher accuracy or external synchronization is needed - simplifying BOM and layout for MCHC908QT1MDWE designs.

How many ADC channels does the MCHC908QT1MDWE support?

The MCHC908QT1MDWE includes an 8-bit successive-approximation ADC with 8 input channels. Channels AN0–AN3 are multiplexed onto PTB0–PTB3, while AN4–AN7 are available on PTA0–PTA3. Conversion is software-triggered, and results are stored in the 8-bit ADC Data Register (ADCDR).

What low-power modes are supported by the MCHC908QT1MDWE?

The MCHC908QT1MDWE supports two low-power modes: WAIT (CPU halted, peripherals and clocks active) and STOP (all clocks gated except optional AWU oscillator, RAM retained). Both modes reduce current consumption significantly - down to ~1 µA in STOP - enabling battery-powered operation in MCHC908QT1MDWE-based sensor nodes.