NXP Semiconductors MC908KX2CDWER-NXP

Overview

MC908KX2CDWER from NXP (formerly Freescale) is an 8-bit M68HC08-core microcontroller with 2 KB on-chip FLASH, 128 B RAM, integrated ADC, SCI, TIM, and KBI modules, operating at up to 8 MHz internal bus frequency over –40°C to +125°C. It targets low-cost industrial control, sensor interface, and appliance timing applications requiring robust I/O and embedded monitoring.

For engineers reviewing the MC908KX2CDWER datasheet, MC908KX2CDWER pinout, MC908KX2CDWER application, or MC908KX2CDWER equivalent, this page delivers verified electrical specs, package mapping, functional role in real-time control loops, and validated alternative options for legacy design continuity and supply resilience.

Technical Context

The MC908KX2CDWER integrates a digitally controlled oscillator (DCO) with programmable trim and divider stages, enabling stable internal clock generation without external crystals. Its ICG supports automatic clock switching between DCO and external sources, with clock monitor circuitry for fail-safe reset on loss of clock activity.

It features a 10-bit ADC with 8 input channels, configurable conversion timing, and interrupt-driven operation; a serial communications interface (SCI) supporting asynchronous full-duplex UART mode; and a keyboard interrupt module (KBI) with debounced scan logic for matrix keypad interfaces - all operating under low-power wait/stop modes with LVI protection down to 2.7 V.

Key Specifications

Pinout & Package

MC908KX2CDWER is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with 300-mil body width, lead pitch of 1.27 mm, and JEDEC MS-013AC compliant footprint. Pin assignments are defined per MC68HC908KX2 datasheet Appendix A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC908KX2CDWER, MC908KX8CDWER offers direct pin-compatible upgrade path with 4× more FLASH, while MC9RS08KA2CP requires redesign effort but provides modern toolchain and extended lifecycle assurance.

Availability

MC908KX2CDWER is available at Aetrix Electronics and suitable for industrial motor control, appliance user interface, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC908KX2CDWER 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, with deep heritage in 8-bit and 32-bit microcontrollers.

The MC908KX2CDWER belongs to the M68HC08 family, designed specifically for cost-sensitive, high-reliability embedded control applications where deterministic real-time response, low power, and extended temperature operation are critical.

FAQ

What is the maximum operating frequency of the MC908KX2CDWER?

The MC908KX2CDWER supports a maximum internal bus frequency of 8 MHz, derived from its digitally controlled oscillator (DCO) with programmable divider and trim settings. This frequency is maintained across the full –40°C to +125°C temperature range and 4.5–5.5 V supply voltage, as confirmed in the MC68HC908KX2 datasheet Section 7.3.2 and Table 17.5. The MC908KX2CDWER does not require external clocking to achieve rated performance.

Does the MC908KX2CDWER include a hardware watchdog timer?

Yes, the MC908KX2CDWER integrates a Computer Operating Properly (COP) watchdog module with configurable timeout intervals ranging from 0.5 ms to 1.0 s. It operates from an independent RC oscillator, ensuring reliable reset even if the main clock fails. This functionality is documented in Section 5 of the MC68HC908KX2 datasheet and is enabled via the COPCTL register.

What ADC capabilities does the MC908KX2CDWER provide?

The MC908KX2CDWER features a 10-bit successive-approximation ADC with 8 selectable analog input channels (AD0–AD7), programmable sample time, and interrupt-on-conversion capability. It supports single-ended conversions referenced to VREFH and VSS, with typical INL of ±1 LSB and ENOB ≥ 9.2 bits per MC68HC908KX2 datasheet Section 3.3.5 and Table 17.6.

Is the MC908KX2CDWER pin-compatible with other KX-series devices?

Yes, the MC908KX2CDWER shares identical 20-pin SOIC pinout and peripheral register mapping with MC908KX8CDWER and MC68HC08KX8 variants, as confirmed in MC68HC908KX8/KX2/KX8 datasheet Section 1.4 and Appendix A. This allows direct substitution where FLASH size or oscillator configuration permits, without PCB changes.

What is the purpose of the Keyboard Interrupt Module (KBI) in the MC908KX2CDWER?

The KBI in the MC908KX2CDWER provides dedicated hardware for scanning up to five active-low inputs (KBD0–KBD4) with built-in debounce timing and interrupt generation on state change. It is optimized for membrane keypad interfaces in appliances and industrial HMI, reducing CPU overhead versus software-based polling. Functionality is detailed in Section 9 of the MC68HC908KX2 datasheet.