NXP Semiconductors S9KEAZN8ACFK

Overview

S9KEAZN8ACFK from NXP Semiconductors is an automotive-qualified Arm® Cortex-M0+ microcontroller with 8 KB flash, 1 KB RAM, and operation up to 48 MHz - designed for real-time control in engine management, body electronics, and sensor interface modules requiring -40°C to 125°C ambient operation.

For engineers reviewing the S9KEAZN8ACFK datasheet, S9KEAZN8ACFK pinout, S9KEAZN8ACFK application, or S9KEAZN8ACFK equivalent, key selection considerations include its 24-pin QFN package, integrated 12-bit ADC with Stop-mode operation, dual FlexTimer/PWM modules, low-power RTC, and SWD debug interface supporting production programming and field diagnostics.

Technical Context

The S9KEAZN8ACFK implements a single-cycle 32-bit x 32-bit multiplier and single-cycle I/O access port for deterministic real-time execution. Its clock system integrates an internal 37.5 kHz pre-trimmed reference for FLL-based 48 MHz system clock generation, plus support for external 32.768 kHz crystals or 4–24 MHz resonators with selectable low-power/high-gain oscillator modes.

System-level features include three power modes (Run/Wait/Stop), programmable LVD with four warning thresholds, CRC module, BIT-BAND memory aliasing, and BME bit manipulation engine - all operating within 2.7–5.5 V supply range and qualified per automotive AEC-Q100 Grade 1 (-40°C to 125°C).

Key Specifications

Pinout & Package

24-pin QFN (4 mm × 4 mm, 0.5 mm pitch), thermally enhanced with exposed thermal pad - optimized for space-constrained automotive PCBs and high-reliability solder joints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with S9KEAZN8ACFK, S9KEAZN8AMFK(R) offers identical electrical behavior with broader qualification testing, while S9KEAZN8ACTG(R) trades I/O count and package size for lower cost and smaller PCB area - neither is pin-compatible due to different pin counts and layouts.

Availability

S9KEAZN8ACFK is available at Aetrix Electronics and suitable for engine control units, body electronics modules, and smart sensor nodes requiring stable component supply across automotive production lifecycles.

Supply support for S9KEAZN8ACFK 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 specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The KEA8 family - including S9KEAZN8ACFK - was engineered for cost-sensitive, high-reliability automotive applications demanding robust real-time performance, extended temperature operation, and integrated analog/motor control peripherals.

FAQ

What is the maximum operating frequency of the S9KEAZN8ACFK?

The S9KEAZN8ACFK operates at up to 48 MHz using its Arm® Cortex-M0+ core. This frequency is achieved via the internal FLL locked to the 37.5 kHz factory-trimmed reference or an external crystal/resonator. The bus clock runs at half-core speed (24 MHz), and all timing-critical peripherals - including FlexTimer/PWM and ADC - are synchronized to this domain. S9KEAZN8ACFK maintains full specification compliance across its entire -40°C to 125°C temperature range at this speed.

Does the S9KEAZN8ACFK support debug interfaces for firmware development?

Yes, the S9KEAZN8ACFK includes a Serial Wire Debug (SWD) interface compliant with ARM CoreSight standards. It uses two dedicated pins (SWD_DIO and SWD_CLK) for programming, real-time tracing, and breakpoint debugging. The interface operates across the full 2.7–5.5 V supply range and supports clock frequencies up to 24 MHz. S9KEAZN8ACFK does not implement JTAG; SWD is the sole standardized debug path, reducing pin count while maintaining full visibility into core registers, memory, and peripheral states during development and validation.

What analog capabilities does the S9KEAZN8ACFK provide?

The S9KEAZN8ACFK integrates a 12-bit SAR ADC with 12 input channels capable of operation in Stop mode, enabling ultra-low-power sensor acquisition. It also includes two analog comparators (ACMP), each with a 6-bit DAC and programmable reference input for threshold detection and window comparison. The ADC supports hardware triggering from timers or external events, and both ACMP modules feature interrupt generation on output transitions. These analog resources are fully specified across the -40°C to 125°C range, with typical INL of ±1 LSB and comparator propagation delay under 200 ns. S9KEAZN8ACFK requires separate analog supply (VDDA) decoupling for optimal performance.

How many GPIO pins does the S9KEAZN8ACFK offer, and what are their drive strengths?

The S9KEAZN8ACFK provides up to 57 general-purpose I/O pins distributed across three ports (PTA, PTB, PTC). All pins support standard-drive strength (5 mA sink/source at 3 V, 20 mA at 5 V), with PTB5, PTC1, and PTC5 additionally supporting high-drive strength (10 mA at 3 V, 20 mA at 5 V). Input hysteresis is 6% of VDD, and programmable pull-up resistors (30–50 kΩ) are available on most pins. True open-drain capability is implemented on PTA2 and PTA3. S9KEAZN8ACFK GPIOs retain functionality in Wait and Stop modes, enabling wake-up from deep sleep via external events.

Is the S9KEAZN8ACFK qualified for automotive applications?

Yes, the S9KEAZN8ACFK is automotive-qualified per AEC-Q100 Grade 1 standards, with guaranteed operation from -40°C to +125°C ambient temperature. Its part number prefix 'S' denotes automotive qualification, and it undergoes rigorous stress testing including thermal cycling, humidity bias, and ESD (±6 kV HBM). The device includes built-in safety features such as programmable LVD with interrupt/reset options, watchdog timer with independent clock source, and CRC module for memory integrity checking - all essential for ASIL-B capable systems. S9KEAZN8ACFK is intended for non-safety-critical but reliability-demanding automotive subsystems like body electronics and sensor interfaces.