NXP Semiconductors MCHC908QT2CDWE

Overview

MCHC908QT2CDWE 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 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 MCHC908QT2CDWE datasheet, MCHC908QT2CDWE pinout, MCHC908QT2CDWE application, or MCHC908QT2CDWE equivalent, key selection criteria include its 16-pin SOIC-W package, 5 V operation, on-chip COP watchdog, keyboard interrupt module for matrix scanning, and lack of UART or SPI peripherals - requiring external serial interface if needed.

Technical Context

The MCHC908QT2CDWE implements the HCS08 CPU core with 16-bit address space, 8-level hardware stack, and instruction set compatible with MC68HC08. Its memory map includes 2 KB of on-chip FLASH (with block protection), 128 B RAM, and 48 B of register space mapped to $FF80–$FFFF.

It integrates a System Integration Module (SIM) providing clock control, reset generation, and interrupt management; a Timer Interface Module (TIM) with one 16-bit free-running counter and two input-capture/output-compare channels; and an Auto Wakeup Module (AWU) enabling periodic wake-from-STOP via internal RC timer.

Key Specifications

Pinout & Package

Package: 16-pin SOIC-W (Wide-body), 0.300-inch width, JEDEC MS-013AC, body size 10.3 mm × 7.5 mm, lead pitch 1.27 mm.

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 MCHC908QT2CDWE offers superior integration for ultra-low-cost, self-contained keypad+ADC+PWM systems - especially where BOM count reduction and minimal external components are critical.

Availability

MCHC908QT2CDWE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor nodes, consumer remote controls, and smart power outlets requiring stable component supply across extended product lifecycles.

Supply support for MCHC908QT2CDWE 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 and MCU platforms for automotive, industrial, and IoT markets.

The MCHC908QT2CDWE belongs to the legacy HCS08 family designed for cost-optimized, low-pin-count embedded control - emphasizing minimal external components, robustness in noisy environments, and long-term manufacturability for high-volume consumer and industrial products.

FAQ

What is the maximum operating frequency of the MCHC908QT2CDWE?

The MCHC908QT2CDWE supports a maximum bus clock frequency of 8 MHz, derived from its internal trimmed RC oscillator. This frequency is fixed by the oscillator design and cannot be increased via external crystal without reconfiguring the CONFIG1 register for XTAL mode - which requires external components and yields no higher bus speed than the internal oscillator's rated 8 MHz.

Does the MCHC908QT2CDWE support in-circuit debugging?

Yes, the MCHC908QT2CDWE supports background debug mode (BDM) via a single-wire interface using the BKGD pin. This allows full read/write access to memory and registers, real-time breakpoints, and flash programming without halting system operation - essential for development and field firmware updates.

Can the MCHC908QT2CDWE operate from a 3.3 V supply?

No, the MCHC908QT2CDWE is specified only for 4.5 V to 5.5 V operation. Its internal LVI threshold is fixed at 4.0 V, and the oscillator circuitry is not characterized below 4.5 V. Attempting 3.3 V operation will result in undefined behavior, failed startup, or unreliable FLASH programming.

How many ADC channels does the MCHC908QT2CDWE have, and what is their resolution?

The MCHC908QT2CDWE features an 8-bit successive-approximation ADC with 8 input channels. Channels AD0–AD7 correspond to PTA0–PTA7, though only PTA0–PTA3 are routed to dedicated ADC pins in the 16-pin SOIC-W package. All channels share a common reference (VDD) and achieve ±1 LSB integral nonlinearity per datasheet specifications.

Is there a UART or SPI peripheral integrated into the MCHC908QT2CDWE?

No, the MCHC908QT2CDWE does not include UART, SPI, or I²C peripherals. Communication must be implemented in firmware using bit-banged GPIO - for example, using TIM output compare for IR carrier generation or PTA/PTB pins for custom serial protocols. External transceivers are required for RS-232 or RS-485 interfaces.