NXP Semiconductors S9S08RNA16W2MLF

Overview

S9S08RNA16W2MLF from NXP (formerly Freescale) is an automotive-grade 8-bit S08 microcontroller with 16 KB flash, 256-byte EEPROM with ECC, and 2 KB RAM, operating from 2.7 V to 5.5 V across –40 °C to 125 °C. It integrates dual SCI/UART, I²C, SPI, two FTM timer modules, 12-bit ADC (12-channel in 48-pin variant), TSI touch sensing, and a background debug interface - deployed in engine control units, body electronics, and industrial sensor nodes.

For engineers reviewing the S9S08RNA16W2MLF datasheet, S9S08RNA16W2MLF pinout, S9S08RNA16W2MLF application, or S9S08RNA16W2MLF equivalent, this page delivers verified technical context, validated package mapping (48-pin LQFP), confirmed low-power stop3 mode current (4.6 µA), real-world peripheral timing (FTM input capture ≥1.5 bus cycles), and two field-validated alternative MCUs for functional migration paths.

Technical Context

The S9S08RNA16W2MLF implements an enhanced S08 CPU core with four-level nested interrupt support and up to 40 interrupt/reset sources. Its clock system combines a Pierce oscillator (XOSC) for crystal/resonator operation and an internal clock source (ICS) with frequency-locked-loop (FLL), enabling stable 20 MHz bus operation across full automotive temperature range.

System protection includes independent watchdog with dedicated clock, configurable low-voltage detect (LVD) with four warning thresholds per range, illegal opcode/address detection, and flash/RAM access protection. Peripheral integration targets deterministic real-time control: dual SCI with LIN extension, FTM modules supporting edge- and center-aligned PWM, and TSI with hardware scan trigger capable of waking from stop3 mode.

Key Specifications

Pinout & Package

Package: 48-pin LQFP (10 mm × 10 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 automotive microcontroller applications.

Compared with S9S08RNA16W2MLF, MC9S08AC128CPUE offers greater memory headroom but omits touch sensing, while S9KEAZ128AMLH provides architectural scalability at the cost of increased power and layout complexity - making S9S08RNA16W2MLF optimal for cost-constrained, touch-integrated automotive peripherals requiring minimal BOM changes.

Availability

S9S08RNA16W2MLF is available at Aetrix Electronics and suitable for engine control units, body electronics modules, and industrial motor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for S9S08RNA16W2MLF 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 leader in secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in microcontroller design dating to the Motorola semiconductor division.

The S9S08RN series was engineered specifically for cost-sensitive, high-reliability automotive body and powertrain applications demanding extended temperature operation, robust EMC immunity, and long-term supply assurance - with S9S08RNA16W2MLF representing the 16 KB flash, 48-pin LQFP, –40 °C to 125 °C variant.

FAQ

What is the maximum bus frequency supported by the S9S08RNA16W2MLF?

The S9S08RNA16W2MLF supports a maximum bus frequency of 20 MHz across its full operating voltage range (2.7 V to 5.5 V) and temperature range (–40 °C to 125 °C). This is achieved using either the internal clock source (ICS) with FLL or an external crystal/resonator via the XOSC module. The 20 MHz specification is guaranteed per the datasheet's control timing table (fBus max = 20 MHz, DC to 20 MHz).

Does the S9S08RNA16W2MLF support in-circuit debugging, and what interface is used?

Yes, the S9S08RNA16W2MLF supports in-circuit debugging via a single-wire background debug (BDM) interface using the BKGD pin. It includes breakpoint capability (three configurable breakpoints), an on-chip in-circuit emulator (ICE) debug module with two comparators and nine trigger modes, and supports forced reset entry into debug mode - all documented in the S9S08RN16DS Rev 1 datasheet section "Development support".

What is the stop3 mode current consumption of the S9S08RNA16W2MLF at 5 V?

The S9S08RNA16W2MLF consumes 4.6 µA typical in stop3 mode at 5 V and –40 °C to 125 °C ambient temperature, with only the 1 kHz LPO clock active. This value is specified in Table 4, row 6 ("Stop3 mode supply current") of the S9S08RN16DS Rev 1 datasheet. Additional peripherals like ADC or TSI increase current additively (e.g., +40 µA for ADC, +121 µA for TSI).

Which package type corresponds to the S9S08RNA16W2MLF part number suffix "LF"?

The "LF" suffix in S9S08RNA16W2MLF denotes a 48-pin LQFP package (10 mm × 10 mm, 0.5 mm pitch), as defined in Section 2.3 ("Fields") of the S9S08RN16DS Rev 1 datasheet. This matches the thermal resistance data (θJA = 82 °C/W on single-layer board) and pin assignment tables (Section 8) for the 48-pin variant.

Can the S9S08RNA16W2MLF operate without an external crystal?

Yes, the S9S08RNA16W2MLF can operate without an external crystal by using its internal clock source (ICS) with frequency-locked-loop (FLL) and factory-trimmed internal reference (39.0625 kHz). The trimmed DCO output achieves ±2.0% deviation over –40 °C to 125 °C, enabling reliable 20 MHz bus operation - eliminating external crystal cost and board space in non-precision timing applications.