NXP Semiconductors MCHC908QY2MDWE

Overview

MCHC908QY2MDWE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 2 KB FLASH, 128 B RAM, and integrated 8-channel 8-bit ADC. It features internal RC oscillator (4 MHz nominal), low-voltage inhibit (LVI), computer operating properly (COP) watchdog, and keyboard interrupt (KBI) for touch-key sensing. Used in cost-sensitive embedded control applications such as appliance user interfaces and sensor nodes.

For engineers reviewing the MCHC908QY2MDWE datasheet, MCHC908QY2MDWE pinout, MCHC908QY2MDWE application, or MCHC908QY2MDWE equivalent, key selection criteria include its 8-pin SOIC package, 4 MHz internal clock accuracy (±2% trimmed), 2 KB FLASH endurance (10k erase/write cycles), KBI wake-on-key capability, and LVI reset threshold at 2.5 V (min).

Technical Context

The MCHC908QY2MDWE implements the HCS08 CPU core with 16-bit address bus and Harvard architecture. It supports WAIT and STOP low-power modes, with wake-up sources including IRQ, KBI, AWU timer, and LVI events. The internal oscillator is factory-trimmed to ±2% over temperature and voltage.

Its memory map includes 2 KB of on-chip FLASH (with block protection), 128 B RAM, and dedicated I/O register space. Peripheral integration includes a 16-bit TIM module with input capture/output compare, 8-bit ADC with software-triggered conversion, and configurable port pins supporting pull-ups and open-drain outputs.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (SO-8), body width 3.9 mm, lead pitch 1.27 mm, compliant with JEDEC MS-012AC.

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 MCHC908QY2MDWE delivers hardware-accelerated key wake-up and factory-trimmed oscillator stability at lower system cost - critical for high-volume, battery-operated UI controllers where BOM reduction and ultra-low standby current are design priorities.

Availability

MCHC908QY2MDWE is available at Aetrix Electronics and suitable for appliance control panels, industrial sensor nodes, and smart lighting dimmers requiring stable component supply and long-term production continuity.

Supply support for MCHC908QY2MDWE 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 MCHC908QY2MDWE belongs to the legacy HCS08 microcontroller family, designed for cost-optimized, low-power embedded control in consumer and industrial applications where small footprint, minimal external components, and robustness under voltage variation are essential.

FAQ

What is the maximum operating frequency of the MCHC908QY2MDWE?

The MCHC908QY2MDWE operates with a maximum bus clock frequency of 4 MHz, derived from its factory-trimmed internal RC oscillator. This frequency is guaranteed across the full operating voltage range (2.7–5.5 V) and temperature range (–40°C to +85°C), with typical accuracy of ±2% after trimming. No external crystal is required to achieve this speed, simplifying design and reducing bill-of-materials cost.

Does the MCHC908QY2MDWE support in-circuit debugging?

Yes, the MCHC908QY2MDWE supports background debug mode (BDM) via the PTA4/OSC2 pin used as a bidirectional debug interface. This allows full read/write access to memory and registers, real-time breakpoint setting, and single-stepping without requiring additional pins or dedicated debug headers. Debugging requires a compatible BDM pod and Codewarrior or S08 IDE toolchain.

Can the MCHC908QY2MDWE wake from STOP mode using external interrupts?

Yes, the MCHC908QY2MDWE can wake from STOP mode using IRQ (on PTA0), KBI (on PTA1 or PTA2), AWU timer timeout, or LVI reset events. All these sources retain their functionality in STOP mode, with typical wake-up latency under 4 µs. The KBI wake-up is especially valuable for ultra-low-power keypad applications, drawing less than 1 µA in STOP while monitoring for key presses.

What is the FLASH endurance specification for the MCHC908QY2MDWE?

The MCHC908QY2MDWE specifies 10,000 erase/write cycles for its 2 KB FLASH memory, with data retention guaranteed for 10 years at 85°C. FLASH pages can be erased individually (512-byte blocks), and block protection is configurable via the FLBPR register to prevent accidental overwrite of critical firmware sections such as boot code or calibration constants stored in the upper 512-byte block.

Is the MCHC908QY2MDWE pin-compatible with other QY-series MCUs like the QY4?

No, the MCHC908QY2MDWE is not pin-compatible with the MC68HC908QY4 or other variants in the QY/QT family. While all share the same 8-pin SOIC package and core peripheral set, pin functions differ significantly - for example, PTA3/OSC1 and PTA4/OSC2 are dedicated to crystal operation in QY4 but serve dual roles including BUSCLKX4 output in QY2. PCB layout and firmware initialization must be verified per specific variant.