NXP Semiconductors MC9S08JS8LCFK

Overview

MC9S08JS8LCFK from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 8 KB flash, 512 bytes RAM, USB 2.0 full-speed interface, and integrated 3.3 V regulator - designed for embedded control in USB-connected industrial sensors and low-power human-interface devices.

For engineers reviewing the MC9S08JS8LCFK datasheet, MC9S08JS8LCFK pinout, MC9S08JS8LCFK application, or MC9S08JS8LCFK equivalent, key selection criteria include its 24-pin QFN package, 24 MHz bus frequency, USB transceiver compliance, low-voltage detection thresholds (VLVD0 = 2.48–2.70 V), and stop3 mode current of 1.5 μA at 5 V.

Technical Context

The MC9S08JS8LCFK implements the HCS08 CPU core with 48 MHz maximum core clock and 24 MHz internal bus frequency, supported by the Multi-Purpose Clock Generator (MCG) featuring FLL and PLL modes, internal 31.25–39.0625 kHz reference, and trim-adjustable DCO output (32–40 MHz). It integrates a dedicated USB 2.0 full-speed (12 Mbps) transceiver with on-chip 3.3 V regulator (VUSB33), endpoint 0 plus six configurable endpoints, and hardware CRC16-CCITT generator.

Peripherals include one SPI module (8-/16-bit, with hardware match), one SCI supporting LIN master/slave extended break, one 2-channel 16-bit TPM with PWM and input capture, one 8-bit modulo timer (MTIM), real-time counter (RTC), keyboard interrupt (KBI), and CRC engine. Power management supports Wait, Stop2, and Stop3 modes with RTC and LVD adders.

Key Specifications

Pinout & Package

MC9S08JS8LCFK is housed in a 24-pin quad flat no-lead (QFN) package, case number 1982-01 (98ASA00734D), with exposed thermal pad for enhanced thermal performance in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08JS8LCFK, MC9S08JS16LCFK offers double flash capacity with zero hardware changes, while S9KEAZ128AMLH provides ARM-class compute headroom at the cost of migration effort - making the former ideal for incremental feature expansion and the latter for next-generation architecture shifts.

Availability

MC9S08JS8LCFK is available at Aetrix Electronics and suitable for industrial sensor nodes, USB HID devices, embedded diagnostic tools, and smart home control panels requiring stable component supply across long production lifecycles.

Supply support for MC9S08JS8LCFK 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 markets, with deep heritage in microcontrollers dating back to Motorola and Freescale.

The MC9S08JS8LCFK belongs to the HCS08 family - engineered for cost-sensitive, USB-enabled embedded control applications where low power, small footprint, and integrated analog/USB peripherals are critical.

FAQ

What is the maximum operating frequency of the MC9S08JS8LCFK CPU core?

The MC9S08JS8LCFK CPU core operates at up to 48 MHz, with a corresponding 24 MHz internal bus frequency. This timing is achieved using the on-chip Multi-Purpose Clock Generator (MCG) in PEE mode, where the Phase-Locked Loop (PLL) multiplies the external crystal or internal reference to generate the required clock. The MC9S08JS8LCFK specification guarantees this performance across the full –40 °C to +85 °C temperature range and 2.7–5.5 V supply voltage.

Does the MC9S08JS8LCFK support USB device enumeration without external components?

Yes, the MC9S08JS8LCFK supports full USB 2.0 full-speed (12 Mbps) device enumeration with no external components beyond standard USB termination. Its integrated transceiver includes a programmable 1.5 kΩ pull-up resistor on USBDP, a dedicated 3.3 V regulator (VUSB33), and hardware endpoint management. External requirements are limited to a single 1 μF ceramic capacitor on VUSB33 and proper PCB routing for differential USB traces - no external PHY, level shifter, or LDO is needed.

What low-power modes does the MC9S08JS8LCFK support, and what is the lowest current draw?

The MC9S08JS8LCFK supports Wait, Stop2, and Stop3 low-power modes. In Stop3 mode - where all clocks are halted except the 1 kHz LPO and optional RTC - the device draws just 1.5 μA at 5 V and 25 °C. With RTC enabled, current increases by only 300 nA; with low-voltage detection active, it adds 106.7 μA. This ultra-low quiescent current makes the MC9S08JS8LCFK suitable for battery-powered applications requiring multi-year operation.

Can the MC9S08JS8LCFK be programmed in-system via USB?

Yes, the MC9S08JS8LCFK includes a 4 KB ROM-based USB bootloader that supports in-system programming without external debug hardware. When configured via BLMS pin at reset, the device enters bootloader mode and exposes a USB HID-class interface for mass erase, partial flash erase (excluding first 1 KB), and flash programming. This capability enables field firmware updates directly over USB, eliminating the need for dedicated programming fixtures or SWD/JTAG adapters.

What is the function of the VSSOSC pin on the MC9S08JS8LCFK?

The VSSOSC pin on the MC9S08JS8LCFK is a dedicated analog ground connection for the crystal oscillator circuit. It must be connected to the system ground plane but physically separated from noisy digital ground traces to minimize injection of switching noise into the oscillator loop. This isolation ensures stable crystal startup and low-jitter clock generation - especially critical when using low-frequency (32 kHz) watch crystals for RTC operation or high-frequency (1–16 MHz) crystals for system timing.