NXP Semiconductors S9S08RN8W2MLF

Overview

S9S08RN8W2MLF from NXP (formerly Freescale) is an 8-bit S08 core microcontroller designed for automotive and industrial embedded control. It features 8 KB flash, 256-byte EEPROM with ECC, 2 KB RAM, operates from 2.7–5.5 V across –40 °C to 125 °C, and supports up to 20 MHz bus frequency. Its integrated peripherals include dual SCI/UART, I²C, SPI, two FTM modules, 12-bit ADC (12-channel in 48-pin variant), TSI touch sensing, and low-power stop3 mode consuming only 4.6 µA.

For engineers reviewing the S9S08RN8W2MLF datasheet, S9S08RN8W2MLF pinout, S9S08RN8W2MLF application, or S9S08RN8W2MLF equivalent, this page delivers verified technical context, validated package mapping to 48-pin LQFP, confirmed peripheral timing specs, real-world use cases in motor control and body electronics, and two rigorously cross-checked alternative MCUs with documented functional and parametric differences.

Technical Context

The S9S08RN8W2MLF implements an enhanced S08 CPU with four-level nested interrupt support and up to 40 interrupt/reset sources. Its clock system integrates a loop-controlled Pierce oscillator (XOSC) and an internal clock source (ICS) with frequency-locked-loop (FLL), enabling precise 1–2% frequency stability across –40 °C to 125 °C via factory-trimmed internal reference.

System protection includes independent watchdog timer, configurable low-voltage detect (LVD) with four warning thresholds per range, illegal opcode/address detection, and flash/RAM access protection. Debug is enabled via single-wire background debug interface (BDM) with three breakpoints and on-chip ICE module featuring two comparators and nine trigger modes.

Key Specifications

Pinout & Package

Package: 48-pin LQFP (7 mm × 7 mm, 0.5 mm pitch), RoHS-compliant, moisture sensitivity level MSL3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08RN16W2MLF, S9S08RN8W2MLF offers identical footprint and peripheral compatibility at lower cost and memory - ideal for cost-sensitive volume production. Versus S9KEAZ128AMLH, it provides proven 8-bit determinism and simpler certification paths for ASIL-B automotive functions, despite lower compute headroom.

Availability

S9S08RN8W2MLF is available at Aetrix Electronics and suitable for automotive body electronics, industrial motor interfaces, smart appliance HMI, and heavy-duty relay control requiring stable component supply across extended temperature and long product lifecycles.

Supply support for S9S08RN8W2MLF 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 applications, with deep heritage in microcontroller innovation dating to the Motorola 6800 era.

The S08 RN series was engineered specifically for cost-optimized, high-reliability embedded control in harsh environments - emphasizing robustness, low-power operation, and integrated analog/motor control peripherals for automotive body and industrial subsystems.

FAQ

What is the maximum bus frequency supported by the S9S08RN8W2MLF?

The S9S08RN8W2MLF supports a maximum bus frequency of 20 MHz across its full operating voltage range (2.7–5.5 V) and temperature range (–40 °C to 125 °C). This is achieved using the internal clock source (ICS) with frequency-locked-loop (FLL) and factory-trimmed internal reference, ensuring stable timing without external crystal dependency in many applications. The S9S08RN8W2MLF maintains this performance under worst-case conditions, making it suitable for real-time control loops in automotive and industrial settings.

Does the S9S08RN8W2MLF support in-circuit debugging, and what interface is used?

Yes, the S9S08RN8W2MLF supports full in-circuit debugging via a single-wire background debug interface (BDM) on the BKGD pin. It includes breakpoint capability for up to three breakpoints and an on-chip in-circuit emulator (ICE) module with two comparators and nine trigger modes. This allows real-time code inspection, register monitoring, and non-intrusive execution control - essential for validating timing-critical functions like motor commutation or touch sensing in the S9S08RN8W2MLF.

What are the key low-power capabilities of the S9S08RN8W2MLF?

The S9S08RN8W2MLF offers multiple low-power modes, most notably Stop3 mode, which consumes just 4.6 µA at 5 V with only the 1 kHz LPO clock active. It also supports reduced-power wait mode and peripheral clock gating to disable unused modules. Critically, peripherals including ADC, TSI, and LVD can remain active during Stop3 - enabling wake-on-touch or wake-on-analog-threshold events. These capabilities make the S9S08RN8W2MLF well-suited for battery-backed or energy-harvesting applications where microamp-level quiescent current is mandatory.

Which package does the S9S08RN8W2MLF use, and is it pin-compatible with other RN series devices?

The S9S08RN8W2MLF uses a 48-pin LQFP package (7 mm × 7 mm, 0.5 mm pitch), designated by the "LF" suffix in its part number. It is fully pin-compatible with the MC9S08RN16W2MLF - sharing identical pin assignments, peripheral multiplexing, and electrical characteristics. This allows seamless migration between 8 KB and 16 KB flash variants without PCB redesign, simplifying product family scaling and inventory management for the S9S08RN8W2MLF and related devices.

What analog peripherals are integrated into the S9S08RN8W2MLF?

The S9S08RN8W2MLF integrates a 12-bit, 12-channel ADC (in the 48-pin LQFP package), an analog comparator (ACMP) with independently configurable rising/falling-edge interrupts and filtering, and a buffered bandgap reference (1.16 V typical). The ADC supports hardware triggers, data watermark buffering, automatic compare, and operation in Stop3 mode. These analog resources enable direct sensing of temperature, voltage, current, and resistive sensors - critical for closed-loop control in applications leveraging the S9S08RN8W2MLF.