NXP Semiconductors MCHC908QY1CDWE

Overview

MCHC908QY1CDWE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB Flash, 192 B RAM, and integrated 8-channel 8-bit ADC, designed for cost-sensitive embedded control in appliance motor interfaces, industrial sensor nodes, and battery-powered instrumentation.

For engineers reviewing the MCHC908QY1CDWE datasheet, MCHC908QY1CDWE pinout, MCHC908QY1CDWE application, or MCHC908QY1CDWE equivalent, key selection criteria include internal RC oscillator accuracy (±2% at 25°C), 16 MHz max bus clock, 8-pin SOIC package footprint, and support for WAIT/STOP low-power modes with wake-up via KBI or AWU.

Technical Context

The MCHC908QY1CDWE implements the HCS08 CPU core with 16-bit address space, 8-level hardware stack, and instruction set optimized for compact code size. It integrates a System Integration Module (SIM) managing reset, clock gating, and interrupt vectoring, alongside dedicated modules for keyboard interrupt (KBI), auto-wakeup (AWU), and low-voltage inhibit (LVI).

Its oscillator subsystem supports internal RC (1–8 MHz), external crystal (up to 8 MHz), or external clock input, with programmable trimming of the internal oscillator via OSCTRIM register. The ADC operates with configurable conversion time (16–64 µs), software- or timer-triggered sampling, and 8 selectable input channels mapped to Port A pins.

Key Specifications

Pinout & Package

Package: 8-pin SOIC (Small Outline Integrated Circuit), 150 mil width, JEDEC MS-012AC standard. Pin pitch 1.27 mm, body dimensions 3.9 mm × 4.9 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CSC and MC9S08QG4CDTE, the MCHC908QY1CDWE delivers optimal balance of KBI support, ADC channel count, and minimal 8-pin SOIC packaging-making it uniquely suited for space-constrained, human-interface–centric industrial controls where external peripherals are minimized.

Availability

MCHC908QY1CDWE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor nodes, and smart power outlets requiring stable component supply across extended production lifecycles.

Supply support for MCHC908QY1CDWE 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 markets.

The MCHC908QY1CDWE belongs to the legacy HCS08 microcontroller family, engineered for deterministic real-time control in resource-constrained embedded systems with emphasis on low power, small footprint, and high reliability.

FAQ

What is the maximum operating frequency of the MCHC908QY1CDWE?

The MCHC908QY1CDWE supports a maximum bus clock frequency of 16 MHz. This is achieved using the internal RC oscillator (trimmed to 8 MHz base, doubled via PLL), external crystal (up to 8 MHz), or external clock source. At 16 MHz, the HCS08 core executes instructions at approximately 8 million per second, sufficient for real-time control loops in motor and sensor applications. The MCHC908QY1CDWE datasheet specifies timing parameters under this condition across the full –40°C to +85°C range.

Does the MCHC908QY1CDWE support in-circuit programming?

Yes, the MCHC908QY1CDWE supports in-system programming (ISP) via its single-wire background debug interface (BDM). Using standard Freescale/NXP BDM tools, users can erase, program, and verify the 4 KB Flash memory without removing the MCHC908QY1CDWE from the target board. This enables field firmware updates and simplifies manufacturing test. The MCHC908QY1CDWE requires only the BKGD pin and VDD/VSS connections for debug access.

How many ADC channels does the MCHC908QY1CDWE provide, and what is their resolution?

The MCHC908QY1CDWE integrates an 8-bit successive-approximation ADC with 8 selectable input channels (AN0–AN7), all mapped to Port A pins PTA0–PTA3 and PTA4–PTA7. Each conversion yields an 8-bit result (0–255) representing the analog input voltage relative to the selected reference (VDD or internal bandgap). Conversion time is configurable between 16 µs and 64 µs depending on bus clock and prescaler settings - a key parameter documented in the MCHC908QY1CDWE electrical specifications table.

What low-power modes are available on the MCHC908QY1CDWE?

The MCHC908QY1CDWE offers two hardware-supported low-power states: WAIT mode (CPU halted, peripherals active, ~10 µA typical) and STOP mode (all clocks gated except LVI and AWU, ~0.5 µA typical). Both modes support wake-up via KBI, IRQ, AWU timeout, or LVI event. The MCHC908QY1CDWE's STOP current is specified down to 1 µA maximum at 25°C, making it suitable for battery-powered applications requiring multi-year operation. Configuration is controlled via the STOP and WAIT instructions.

Is the MCHC908QY1CDWE pin-compatible with other QY-series MCUs?

No, the MCHC908QY1CDWE is not pin-compatible with higher-pin-count QY variants (e.g., QY2, QY4) due to differing package footprints and I/O allocations. However, it shares identical pinout and electrical characteristics with the MC68HC908QY1CDWE and MC68HC908QY1CP - all are 8-pin SOIC devices with functionally identical terminal assignments. The MCHC908QY1CDWE is a direct replacement for those part numbers within the same temperature and packaging grade.