NXP Semiconductors MC9S08JS16LCFK

Overview

MC9S08JS16LCFK from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08 microcontroller with 16 KB flash, 512 bytes RAM, USB 2.0 full-speed interface, and 24-pin QFN package. It operates at up to 48 MHz CPU frequency with 24 MHz bus speed, supports crystal/resonator/external clock inputs via MCG, and integrates TPM, SCI, SPI, RTC, CRC, and keyboard interrupt modules. It targets embedded USB peripheral control in industrial sensors and low-power human-interface devices.

For engineers reviewing the MC9S08JS16LCFK datasheet, MC9S08JS16LCFK pinout, MC9S08JS16LCFK application, or MC9S08JS16LCFK equivalent, key selection factors include its 24-pin QFN footprint, USB transceiver with integrated 3.3 V regulator, low-voltage detection thresholds (VLVD0 = 2.48–2.70 V), stop3 mode current (1.50 μA), and COP reset with independent 1 kHz clock source.

Technical Context

The MC9S08JS16LCFK implements the HCS08 CPU core with 48 MHz maximum operation and a multi-purpose clock generator (MCG) supporting FLL and PLL modes. Its MCG accepts 32 kHz–16 MHz external sources and delivers trimmed DCO output (32–40 MHz) with ±2% total deviation over voltage and temperature.

It integrates a full-speed USB 2.0 transceiver with dedicated on-chip 3.3 V regulator (VUSB33), endpoint 0 plus six configurable endpoints, and hardware CRC16-CCITT compliance. Peripheral timing is synchronized to the 24 MHz bus clock, with TPM channels supporting edge-aligned PWM, input capture, and buffered centered PWM (CPWM) configurations.

Key Specifications

Pinout & Package

MC9S08JS16LCFK uses a 24-pin quad flat no-lead (QFN) package per case number 98ASA00734D, with exposed thermal pad and 0.5 mm pitch. The package supports reflow soldering and provides low-inductance ground connection via the exposed pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC9S08JS16LCFK, MC9S08JS16CFK offers identical functionality in SOIC for ease of hand-soldering but sacrifices thermal efficiency and board density, while S9KEAZ128AMLH provides ARM-based upgrade path with expanded memory and analog capability at the cost of increased power and software complexity.

Availability

MC9S08JS16LCFK is available at Aetrix Electronics and suitable for industrial sensor nodes, USB human interface devices, embedded USB-to-UART bridges, and low-power industrial timer modules requiring stable component supply and long-term lifecycle support.

Supply support for MC9S08JS16LCFK 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 expertise in microcontrollers and embedded security.

The MC9S08JS16LCFK belongs to the HCS08 family, designed specifically for cost-sensitive, USB-enabled embedded control applications where small footprint, low power, and integrated USB PHY are critical system requirements.

FAQ

What is the maximum CPU clock frequency supported by the MC9S08JS16LCFK?

The MC9S08JS16LCFK supports a maximum CPU clock frequency of 48 MHz, achieved when the multi-purpose clock generator (MCG) is configured in PEE mode with a trimmed DCO output. This frequency is specified across the full operating temperature range (–40 °C to +85 °C) and supply voltage (2.7–5.5 V). The internal bus clock runs at half the CPU frequency (24 MHz), which governs peripheral timing including TPM, SCI, and SPI modules. The MC9S08JS16LCFK datasheet confirms this value in Section 1 under "Features" and Table 9 for MCG frequency specifications.

Does the MC9S08JS16LCFK include an integrated USB transceiver and voltage regulator?

Yes, the MC9S08JS16LCFK integrates a full-speed USB 2.0 transceiver and a dedicated on-chip 3.3 V regulator (VUSB33). The transceiver supports endpoint 0 and up to six additional endpoints, and the regulator supplies the USB PHY independently from the main VDD rail. This eliminates the need for external USB PHY ICs or LDOs in most designs. Electrical characteristics for USB suspend current (273.3 μA) and USB enable current (1.5 mA) are documented in Table 7 of the MC9S08JS16LCFK datasheet, confirming functional integration.

What are the low-power modes available on the MC9S08JS16LCFK and their typical current consumption?

The MC9S08JS16LCFK supports Wait, Stop2, and Stop3 power-saving modes. In Stop3 mode with all modules disabled, typical current is 1.50 μA at 5 V (Table 7, row 4). With RTC enabled, an adder of 300 nA applies; with LVD enabled, an adder of 106.7 μA applies. Stop2 mode consumes 1.36 μA (row 3), and Run mode at 48 MHz CPU/24 MHz bus draws 19.93 mA at 5 V (row 2). These values are measured per the MC9S08JS16LCFK datasheet's Supply Current Characteristics section and reflect actual silicon characterization.

How many I/O pins does the MC9S08JS16LCFK have, and what configurable features do they support?

The MC9S08JS16LCFK provides 18 GPIO pins across Ports A and B (excluding power, reset, and USB pins). Each I/O supports software-selectable pullups (20–65 kΩ), slew rate control, and drive strength (low/high). Input hysteresis is 0.06 × VDD, and digital input thresholds are VIH ≥ 0.65 × VDD and VIL ≤ 0.35 × VDD. These features are confirmed in Table 6 (DC Characteristics) of the MC9S08JS16LCFK datasheet, ensuring noise immunity and flexible interface design without external components.

What is the purpose of the BKGD/MS pin on the MC9S08JS16LCFK, and how is it used in development?

PTB2 serves as the BKGD/MS (Background Debug / Master Select) pin on the MC9S08JS16LCFK, enabling single-wire background debug communication for programming, breakpoint setting, and real-time register inspection. It functions as a bidirectional debug interface compatible with standard BDM tools and does not require JTAG headers or external debug adapters. The MC9S08JS16LCFK Reference Manual (MC9S08JS16RM) specifies its use in both debug and normal operation modes, and the pin assignment table confirms its dual role in the 24-QFN package layout.