NXP Semiconductors MCHC908QY1MDWE

Overview

MCHC908QY1MDWE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB Flash, 192 B RAM, and integrated 8-channel 10-bit ADC. It features internal RC oscillator (4 MHz nominal), low-voltage inhibit (LVI), COP watchdog, and keyboard interrupt module - designed for cost-sensitive embedded control in appliance user interfaces and industrial sensor nodes.

For engineers reviewing the MCHC908QY1MDWE datasheet, MCHC908QY1MDWE pinout, MCHC908QY1MDWE application, or MCHC908QY1MDWE equivalent, key selection criteria include Flash size, ADC resolution and channel count, operating voltage range (2.7–5.5 V), package footprint (SOIC-16), and availability of on-chip oscillator trimming register (OSCTRIM) for production calibration.

Technical Context

The MCHC908QY1MDWE implements the HCS08 CPU core with 16-bit address bus, supporting up to 64 KB memory space. Its oscillator module supports internal RC (4 MHz ±20% untrimmed), external crystal (up to 8 MHz), or RC network configurations - with OSCTRIM register enabling factory or field calibration to ±1% accuracy.

System integration includes a 16-bit Timer Interface Module (TIM) with input capture/output compare, Auto Wakeup Module (AWU) for periodic wake-from-wait, and Low-Voltage Inhibit (LVI) with programmable trip points (2.5 V or 3.8 V). All peripherals are memory-mapped and accessible via standard I/O registers at fixed addresses.

Key Specifications

Pinout & Package

Package: 16-pin SOIC (Case #751A-03), 1.27 mm pitch, body width 3.9 mm, compliant with JEDEC MS-012AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CSC and STM8S003F3P6, the MCHC908QY1MDWE uniquely integrates keyboard interrupt hardware and oscillator trimming in a 16-pin SOIC - reducing BOM count and calibration effort for appliance UIs, while offering balanced Flash/RAM for mid-complexity control tasks.

Availability

MCHC908QY1MDWE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, smart power outlets, and portable medical diagnostic devices requiring stable component supply and long-term manufacturability.

Supply support for MCHC908QY1MDWE 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 headquartered in Eindhoven, Netherlands, with R&D centers across Asia, Europe, and the Americas.

The MCHC908QY1MDWE belongs to the legacy HCS08 microcontroller family, designed specifically for cost-optimized, low-power embedded control in consumer and industrial equipment where reliability, small footprint, and minimal external components are critical.

FAQ

What is the maximum operating frequency of the MCHC908QY1MDWE?

The MCHC908QY1MDWE supports a maximum system clock frequency of 8 MHz. This can be achieved using an external crystal oscillator or by configuring the internal RC oscillator with appropriate prescaling. The bus clock (BUSCLK) operates at half the system clock frequency, delivering up to 4 MHz for instruction execution - sufficient for real-time response in appliance and sensor control applications. The MCHC908QY1MDWE datasheet specifies timing parameters under all valid clock configurations.

Does the MCHC908QY1MDWE include an integrated oscillator?

Yes, the MCHC908QY1MDWE includes an internal RC oscillator rated at 4 MHz nominal, with factory-trimmed accuracy of ±1% and untrimmed tolerance of ±20%. The OSCTRIM register ($FFC0) allows fine-tuning during production or field calibration. External crystal (up to 8 MHz) and RC network options are also supported via configuration bits in CONFIG1 and CONFIG2 registers.

How many ADC channels does the MCHC908QY1MDWE support?

The MCHC908QY1MDWE supports 8 single-ended ADC input channels mapped to Port A pins (PTA0–PTA7). It features a 10-bit successive approximation converter with typical INL of ±1 LSB and conversion time of 25 µs per sample at 4 MHz bus clock. The ADC includes dedicated status and data registers (ADSC, ADDATA) and supports both single-conversion and continuous modes.

Is the MCHC908QY1MDWE pin-compatible with other QY-series MCUs?

No, the MCHC908QY1MDWE is not pin-compatible with MC68HC908QY2 or MC68HC908QY4. While all share the same 16-pin SOIC package and core peripheral set, pin assignments differ - particularly for PTA4 (shared with OSC2), IRQ input location, and TEST/PGM functionality. Board-level compatibility requires verification against each device's specific pin assignment diagram in Rev. 6 datasheet Figure 1-2.

What debug interface does the MCHC908QY1MDWE support?

The MCHC908QY1MDWE supports single-wire Background Debug Mode (BDM) via the TEST/PGM pin. This interface enables non-intrusive flash programming, real-time register inspection, breakpoint setting, and memory read/write operations using standard NXP BDM tools such as the DEMO9RS08KA2 evaluation board or third-party debug probes compatible with the HCS08 BDM protocol.