NXP Semiconductors MC9RS08KA4CWG

Overview

MC9RS08KA4CWG from NXP Semiconductors (formerly Freescale) is an 8-bit RS08 core microcontroller designed for cost-sensitive, low-power embedded control applications. It features 4 KB flash memory, 126-byte RAM, 16-pin SOIC package (Case 751G), operates from 1.8 V to 5.5 V across –40°C to +85°C, and integrates ADC, TPM, IIC, ACMP, and single-wire background debug.

For engineers reviewing the MC9RS08KA4CWG datasheet, MC9RS08KA4CWG pinout, MC9RS08KA4CWG application, or MC9RS08KA4CWG equivalent, this page delivers verified technical context, real-world peripheral behavior, supply current profiles in run/stop modes, and validated alternative options for industrial sensor nodes, appliance controls, and battery-powered HMI interfaces.

Technical Context

The MC9RS08KA4CWG implements a subset of the HC08 instruction set with BGND support and executes at up to 20 MHz via its internal frequency-locked-loop (FLL)-based ICS clock source - trimmed to ±2% over voltage and temperature. Its 10-bit ADC supports 12 channels (8 available in 16-pin package), 2.5 μs conversion time, and operation in stop mode with 2.7–5.5 V full-range functionality.

System-level protection includes COP reset (with 1 kHz internal or bus clock option), low-voltage detection with interrupt/reset, illegal opcode/address detection, and flash block protection. Power management enables wait and stop modes, with wakeup via RTI, KBI, or ACMP - achieving as low as 1.5 μA stop current at 1.8 V.

Key Specifications

Pinout & Package

MC9RS08KA4CWG is housed in a 16-pin W-SOIC package (Case 751G), 3.9 mm × 9.9 mm body, 1.27 mm pitch, JEDEC MS-012AC compliant. Pin functions are validated per Freescale MC9RS08KA8 Series Datasheet Rev. 4 (2009), Figure 3 and Table 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KA4CWG, MC9RS08KA8CWG offers double flash/RAM in identical packaging for seamless upgrade, while S08AW60A provides architectural expansion at the cost of mechanical and electrical redesign - making the former ideal for memory-constrained cost targets and the latter for long-term platform evolution.

Availability

MC9RS08KA4CWG is available at Aetrix Electronics and suitable for smart appliance control, industrial sensor nodes, consumer remote controls, and LED lighting drivers requiring stable component supply and long-term manufacturability.

Supply support for MC9RS08KA4CWG 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, IoT, and mobile applications - formed from the spin-off and acquisition of Freescale Semiconductor in 2015.

The RS08 family, including MC9RS08KA4CWG, was engineered for ultra-low-cost, ultra-low-power embedded control in resource-constrained applications - emphasizing minimal BOM, single-supply operation, and integrated analog peripherals.

FAQ

What is the maximum operating frequency of the MC9RS08KA4CWG?

The MC9RS08KA4CWG supports a maximum bus frequency of 10 MHz in FEI/FBI modes and achieves up to 20 MHz CPU operation via its FLL-trimmed internal clock source. This is confirmed in Section 3.11 of the MC9RS08KA8 Series Datasheet Rev. 4, where trimmed DCO output frequency is specified as 20 MHz. The MC9RS08KA4CWG inherits this capability as a member of the KA4 variant within the same series.

Does the MC9RS08KA4CWG support analog-to-digital conversion?

Yes, the MC9RS08KA4CWG integrates a 10-bit ADC with 12-channel input multiplexing. In the 16-pin SOIC package, 8 channels (ADP0–ADP7) are accessible. Conversion time is 2.5 μs, and it operates fully from 2.7 V to 5.5 V - including during stop mode when enabled. These specifications are documented in the "Peripherals" section and Table 14 of the MC9RS08KA8 Series Datasheet Rev. 4.

What debug interface does the MC9RS08KA4CWG provide?

The MC9RS08KA4CWG features a single-wire background debug (BDC) interface using the PTA4 pin (labeled BKGD). It supports in-circuit programming, real-time register inspection, and a single hardware breakpoint - all with minimal pin overhead. This is explicitly stated in the "Development Support" section of the MC9RS08KA8 Series Datasheet Rev. 4 and applies identically to the KA4 variant.

Can the MC9RS08KA4CWG operate from a 1.8 V supply?

Yes, the MC9RS08KA4CWG is fully specified to operate from 1.8 V to 5.5 V across the industrial temperature range (–40°C to +85°C). At 1.8 V, it maintains 10 MHz bus frequency capability, delivers 1.5 μA stop-mode current, and supports full ADC and ACMP functionality - all verified in Tables 7 and 8 of the MC9RS08KA8 Series Datasheet Rev. 4.

Is there flash security protection on the MC9RS08KA4CWG?

Yes, the MC9RS08KA4CWG includes on-chip security circuitry that prevents unauthorized access to both flash memory and RAM contents. This protection is implemented at the hardware level and cannot be bypassed through standard debug interfaces. The feature is described in the "On-Chip Memory" section of the MC9RS08KA8 Series Datasheet Rev. 4 and applies to all variants in the KA4/KA8 family.