NXP Semiconductors MC9RS08KB2CSCR

Overview

MC9RS08KB2CSCR from NXP Semiconductors (formerly Freescale) is an 8-bit RS08 core microcontroller in an 8-pin SOIC package, featuring 2 KB flash, 126-byte RAM, 10-bit ADC with temperature sensor, analog comparator, TPM timer/PWM, I²C, SCI, and low-power modes including Stop mode consuming as low as 0.39 µA at 1.8 V. It targets cost-sensitive embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the MC9RS08KB2CSCR datasheet, MC9RS08KB2CSCR pinout, MC9RS08KB2CSCR application, or MC9RS08KB2CSCR equivalent, key selection criteria include its 1.8–5.5 V wide supply range, single-wire background debug interface, integrated voltage regulator, 24 MHz max bus frequency via internal clock source, and support for LIN-compliant SCI operation in automotive body electronics.

Technical Context

The MC9RS08KB2CSCR implements a subset of the HC08 instruction set with added BGND instruction and a single global interrupt vector. Its RS08 CPU executes instructions in one or two bus cycles, enabling deterministic real-time response in resource-constrained systems.

It integrates an internal clock source (ICS) with FLL, supporting bus frequencies up to 10 MHz using internal reference trimming (0.2% resolution), and accepts external crystals from 31.25 kHz to 16 MHz. System protection includes COP watchdog with dedicated 1 kHz LP oscillator, low-voltage detection with reset/interrupt, and flash-block protection.

Key Specifications

Pinout & Package

MC9RS08KB2CSCR is housed in an 8-pin SOIC package (Case 751), measuring 4.9 mm × 3.9 mm × 1.75 mm, with standard 1.27 mm pitch and gull-wing leads. The exposed pad is not present - this is a standard plastic SOIC, not QFN/DFN.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9RS08KB4CSCR and MC9RS08KA2CSCR, the MC9RS08KB2CSCR offers the optimal balance of analog integration (ADC + ACMP), debug capability (BKGD), and 8-pin SOIC manufacturability - making it ideal for cost-sensitive, sensor-augmented control tasks where 2 KB flash suffices.

Availability

MC9RS08KB2CSCR is available at Aetrix Electronics and suitable for industrial sensor nodes, smart appliance subsystems, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for MC9RS08KB2CSCR 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 for automotive, industrial, and IoT markets.

The MC9RS08KB2CSCR belongs to the RS08 family - a cost-optimized 8-bit MCU line designed for ultra-low-power, high-integration embedded control in space- and budget-constrained applications.

FAQ

What is the maximum operating frequency of the MC9RS08KB2CSCR?

The MC9RS08KB2CSCR supports a maximum bus frequency of 10 MHz using its internal clock source (ICS) with FLL. When driven by an external crystal, the maximum supported frequency is 16 MHz. The CPU executes instructions at bus frequency, delivering deterministic real-time performance suitable for motor control and sensor polling loops. The MC9RS08KB2CSCR maintains full functionality across its 1.8–5.5 V supply range and –40 °C to +85 °C temperature range.

Does the MC9RS08KB2CSCR support in-circuit debugging?

Yes, the MC9RS08KB2CSCR includes a single-wire background debug (BKGD) interface on PTA4, enabling full in-circuit programming, breakpoint setting, and register inspection without halting system operation. This interface requires only one dedicated pin and operates at standard logic levels, eliminating the need for JTAG headers or level shifters. The MC9RS08KB2CSCR's BKGD implementation is fully compatible with standard Freescale/NXP BDM tools and IDEs such as S08 CodeWarrior.

What analog peripherals are integrated into the MC9RS08KB2CSCR?

The MC9RS08KB2CSCR integrates a 12-channel, 10-bit ADC with 2.5 µs conversion time, an analog comparator (ACMP) with rail-to-rail operation and selectable internal bandgap reference, and an on-die temperature sensor (1.7 mV/°C). All three operate in Stop mode, enabling low-power wake-on-analog-event functionality. These peripherals are accessible via shared pins (e.g., PTA0–PTA3), allowing flexible signal routing without external multiplexers. The MC9RS08KB2CSCR's analog capabilities eliminate the need for discrete ADCs or comparators in many cost-sensitive designs.

Can the MC9RS08KB2CSCR operate from a 1.8 V supply?

Yes, the MC9RS08KB2CSCR is fully specified to operate from 1.8 V to 5.5 V across its entire temperature range (–40 °C to +85 °C). At 1.8 V, it achieves 0.39 µA Stop mode current and supports 1.25 MHz bus frequency via internal clock source. Its I/O pins maintain valid logic thresholds (VIH = 0.85 × VDD, VIL = 0.30 × VDD), and internal voltage regulator ensures stable core voltage. This wide supply range makes the MC9RS08KB2CSCR suitable for both coin-cell and 5 V industrial applications. The MC9RS08KB2CSCR retains full peripheral functionality-including ADC, ACMP, and SCI-at minimum supply voltage.

What package options are available for the MC9RS08KB2CSCR?

MC9RS08KB2CSCR is offered exclusively in an 8-pin SOIC package (Case 751), with standard 4.9 mm × 3.9 mm body and 1.27 mm lead pitch. This through-hole or surface-mount package is RoHS-compliant and compatible with automated assembly and reflow processes. Unlike higher-pin-count variants (e.g., MC9RS08KB12 in 24-pin QFN), the MC9RS08KB2CSCR does not have QFN or DFN variants - its pin count and feature set are optimized for the SOIC form factor. The MC9RS08KB2CSCR's package choice prioritizes manufacturability, serviceability, and compatibility with legacy PCB designs.