NXP Semiconductors MC9RS08KA2CDB

Overview

MC9RS08KA2CDB from Freescale Semiconductor is an 8-bit RS08 microcontroller in a 6-pin DFN package, featuring 2 KB Flash, 63 bytes RAM, internal 20-MHz trimmable ICS clock, analog comparator with rail-to-rail operation, and keyboard interrupt support for ultra-low-pin-count embedded control. It targets space-constrained sensor nodes and simple industrial actuators requiring minimal I/O and low-power wake-up capability.

For engineers reviewing the MC9RS08KA2CDB datasheet, MC9RS08KA2CDB pinout, MC9RS08KA2CDB application, or MC9RS08KA2CDB equivalent, this page delivers verified package mapping (6-pin DFN), confirmed peripheral set (ACMP, MTIM, KBI), exact memory allocation (2048 B Flash / 63 B RAM), and validated alternative options for cost- or footprint-sensitive redesigns.

Technical Context

The MC9RS08KA2CDB implements the RS08 CPU core with simplified S08 instruction set extensions including tiny addressing mode (0–15) and short addressing mode (0–31), enabling single-byte instructions for fastest access to critical registers and I/O. Its internal clock source (ICS) supports FEI/FBI/FBILP modes with factory-trimmed 20-MHz oscillator and ±2% deviation over voltage/temperature.

Peripherals are tightly integrated: the analog comparator operates fully in stop mode using either external inputs or internal bandgap reference; the modulo timer provides basic timing with configurable prescaler; and three keyboard interrupt pins (KBI) enable wake-up from wait/stop on edge or level transitions - all mapped to just six physical terminals.

Key Specifications

Pinout & Package

MC9RS08KA2CDB is housed in a 6-pin dual flat no-lead (DFN) package measuring 2.0 mm × 2.0 mm × 0.55 mm (case outline 98ASA00735D), with exposed thermal pad for enhanced thermal dissipation in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA2CDB, MC9RS08KA1CDB offers identical form factor and feature set at reduced memory capacity, while MC9RS08KB12CDT expands I/O and memory in a physically larger package - enabling migration paths without changing core architecture or development tools.

Availability

MC9RS08KA2CDB is available at Aetrix Electronics and suitable for smart sensor nodes, industrial pushbutton interfaces, low-cost motor driver feedback systems, and portable medical device monitors requiring stable component supply across long-lifecycle production programs.

Supply support for MC9RS08KA2CDB 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

Freescale Semiconductor (now part of NXP Semiconductors) is a fabless semiconductor company specializing in embedded controllers, analog, and connectivity solutions for automotive, industrial, and consumer markets.

The MC9RS08KA2CDB belongs to the RS08 microcontroller family designed for ultra-low-pin-count, cost-sensitive embedded control applications where minimal footprint, low power, and integrated debug are essential.

FAQ

What is the package type and dimensions of the MC9RS08KA2CDB?

The MC9RS08KA2CDB uses a 6-pin dual flat no-lead (DFN) package with dimensions 2.0 mm × 2.0 mm × 0.55 mm and case outline number 98ASA00735D. It features an exposed thermal pad on the bottom for improved heat dissipation and grounding. This compact footprint makes the MC9RS08KA2CDB ideal for space-constrained PCBs in portable and sensor applications.

Does the MC9RS08KA2CDB support in-circuit debugging?

Yes, the MC9RS08KA2CDB supports single-wire background debug (BKGD) via the PTA3 pin, enabling full in-circuit programming and real-time debugging without requiring additional debug headers or pins. This capability is built into the silicon and requires only a compatible Freescale/NXP BDM interface - a key advantage of the MC9RS08KA2CDB in field-deployable systems.

What are the power-saving capabilities of the MC9RS08KA2CDB?

The MC9RS08KA2CDB supports Wait and Stop power-saving modes with wake-up sources including real-time interrupt (RTI), keyboard interrupt (KBI), and analog comparator (ACMP). In Stop mode, typical current consumption is less than 1 µA at 3.3 V, and the ACMP remains operational - allowing event-driven wake-up without CPU intervention. This behavior is explicitly characterized in the MC9RS08KA2CDB datasheet's Electrical Characteristics section.

Can the MC9RS08KA2CDB operate without an external crystal?

Yes, the MC9RS08KA2CDB integrates a trimmable 20-MHz internal clock source (ICS) that supports full operation up to 10-MHz bus frequency without any external timing components. The ICS is factory-trimmed to ±0.2% resolution and maintains ±2% stability across temperature and voltage - making the MC9RS08KA2CDB suitable for crystal-free designs where board area and BOM cost are critical.

How many I/O pins does the MC9RS08KA2CDB provide in its 6-pin DFN package?

The MC9RS08KA2CDB in the 6-pin DFN package provides two general-purpose I/O pins (PTA0 and PTA1), one general-purpose input pin (PTA2), and one general-purpose output pin (PTA3), totaling four functional I/O terminals. All four pins support keyboard interrupt (KBI) functionality, with PTA0 and PTA1 designated as primary KBI inputs - a configuration confirmed in the MC9RS08KA2CDB Data Sheet Rev. 4, Section 2.2.