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NXP Semiconductors MC68HC908LK24CFQ
- Part No.:
- MC68HC908LK24CFQ
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 80-QFP
- Datasheet:
-
MC68HC908LK24CFQ.pdf
- Description:
- IC MCU 8BIT 24KB FLASH 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,426
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Product details
Overview
MC68HC908LK24CFQ from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 24 KB on-chip FLASH, 512 B RAM, integrated Real-Time Clock (RTC), LCD driver (up to 32 segments), and infrared serial interface (IRSCI). It operates at up to 8 MHz bus frequency, supports low-power stop/wait modes, and targets embedded control in battery-powered instrumentation and industrial displays.
For engineers reviewing the MC68HC908LK24CFQ datasheet, MC68HC908LK24CFQ pinout, MC68HC908LK24CFQ application, or MC68HC908LK24CFQ equivalent, key selection criteria include RTC accuracy (±1 ppm calibration support), LCD segment drive capability (BP0–BP2, FP0–FP32), IRSCI modulation compliance (IEC 62368-1 IR protocols), and FLASH endurance (100k erase/write cycles).
Technical Context
This MCU integrates a HCS08 CPU core with enhanced peripheral set including a programmable RTC with calendar/alarm/chronograph functions, dual 16-bit timer channels with PWM and input capture, and a dedicated IRSCI module supporting both infrared encoding (38 kHz carrier) and standard SCI UART operation. The CGM includes PLL-based clock generation with selectable reference dividers and VCO range control.
Memory architecture features 24 KB of SuperFlash® FLASH (organized in 512-byte pages), 512 B of RAM, and 2 KB of monitor ROM for in-system programming. Power management includes COP watchdog, LVI reset, and three low-power modes (normal, wait, stop) with selective peripheral clock gating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | HCS08 8-bit CPU, upward-compatible with HC05 instruction set; enables legacy code migration and deterministic interrupt latency. |
| FLASH Memory | 24 KB SuperFlash® with 100k erase/write cycles; supports in-application programming and block protection for bootloader safety. |
| RAM | 512 bytes static RAM; sufficient for real-time data buffering in RTC- and sensor-driven applications. |
| RTC Accuracy | ±1 ppm calibration via RTCCOMR register; enables high-precision timekeeping without external crystal trimming. |
| LCD Driver | Supports up to 32 segments (BP0–BP2, FP0–FP32); eliminates need for external LCD controller in portable meters and panel displays. |
| IRSCI Interface | Integrated infrared encoder/decoder + SCI UART; enables single-pin IR remote control and wired debug communication. |
| Supply Voltage | 2.7–5.5 V operation; accommodates wide-range battery supplies (e.g., 3×AA or Li-ion with LDO dropout). |
Pinout & Package
MC68HC908LK24CFQ is housed in a 64-pin QFP (Quad Flat Package) with 0.5 mm pitch, compliant with JEDEC MO-140. Package dimensions: 10 mm × 10 mm × 1.4 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDD/VSS for digital logic; VDDA/VSSA for analog peripherals (ADC, RTC, IRSCI). |
| OSC1, OSC2 | Crystal oscillator inputs | Supports 32.768 kHz watch crystal for RTC and 1–8 MHz crystals for main system clock. |
| RST | Active-low reset input | Accepts external reset pulse; also triggered by POR, LVI, COP timeout, or illegal opcode. |
| PTB0/TxD, PTB1/RxD | IRSCI transmit/receive I/O | Configurable as IR modulated output (38 kHz) or standard UART TX/RX; shared with general-purpose port B. |
| PTD4/T1CLK, PTD5/T2CLK | Timer clock inputs | Accept external timing sources for TIM1/TIM2; enable precise event synchronization independent of system clock. |
| BP0–BP2, FP0–FP32 | LCD backplane/frontplane outputs | Direct drive of multiplexed LCD glass; supports static, 2-, 3-, or 4-mux configurations up to 32 segments. |
Key Features
| Feature | Design Value |
|---|---|
| Real-Time Clock with Calendar | Full BCD-encoded time/date registers (YRR, MTHR, DAYR, HRR, MINR, SECR, DOWR); supports leap-year correction and alarm interrupts. |
| SuperFlash® Memory Technology | 100k erase/write endurance and 10-year data retention at 85°C; enables robust firmware updates in field-deployed devices. |
| Infrared Serial Communications Interface | Hardware IR encoder (38 kHz carrier, NEC/RC-5 compatible) + full-duplex SCI; reduces MCU firmware overhead for remote control stacks. |
| Low-Voltage Inhibit (LVI) | Programmable trip points (2.5 V, 2.7 V, 3.0 V, 3.3 V); prevents erratic operation during brownout without external supervisor IC. |
| Computer Operating Properly (COP) Watchdog | Configurable timeout (0.5 ms to 1.0 s); resets MCU if application fails to service COP within window - critical for safety-critical control loops. |
Applications
| Industrial Panel Meter | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered handheld meter displaying real-time voltage/current readings with timestamped logging. IC Role / Device Role / Timing Role: Primary controller executing ADC sampling, RTC timestamping, LCD refresh, and IR-based configuration upload. Use Value: Integrated RTC eliminates external timekeeping IC; LCD driver reduces BOM count; IRSCI enables wireless setup without opening enclosure. |
Use Scenario: Wearable pulse oximeter requiring accurate time-stamped SpO₂ measurements and low-power sleep between readings. IC Role / Device Role / Timing Role: System-on-chip managing optical sensor interface, signal processing, RTC-triggered sampling intervals, and display update. Use Value: Stop-mode current <1 µA extends battery life; calibrated RTC ensures clinical-grade time accuracy; integrated LVI prevents data corruption during battery sag. |
| Smart Thermostat Display | Energy Submeter with IR Interface |
Use Scenario: Wall-mounted HVAC controller with segmented LCD showing temperature, schedule, and mode indicators. IC Role / Device Role / Timing Role: Dedicated display controller handling multiplexed LCD drive, button scanning (KBI), and local RTC-based scheduling. Use Value: 32-segment LCD support drives full-feature UI without external driver; KBI module reduces GPIO polling overhead; low-power wait mode minimizes idle consumption. |
Use Scenario: DIN-rail energy monitor communicating kWh data via IR to utility handheld readers per IEC 62056-21. IC Role / Device Role / Timing Role: Data concentrator formatting metering results and transmitting them via IRSCI using standardized DLMS/COSEM frame structure. Use Value: Hardware IR modulation meets IEC 62056-21 optical physical layer requirements; FLASH memory stores tariff tables and firmware updates; RTC provides billing interval timestamps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA2 | 8 KB FLASH, no RTC, no LCD driver, 20-pin SOIC; lower cost but lacks timekeeping and display integration. | Suitable for simple sensor nodes without time/date or display; not viable for metering or thermostat UIs. | Select when RTC/LCD are unnecessary and PCB space/cost constraints favor smaller package. |
| MC9S08LG32 | 32 KB FLASH, 2 KB RAM, USB interface, no IRSCI or LCD driver; higher performance but requires external IR transceiver and display controller. | Better for USB-connected devices needing host PC integration; adds BOM complexity for IR/LCD functions. | Choose when USB connectivity is mandatory and external IR/LCD components are acceptable. |
Compared with MC68HC908LK24CFQ, MC9RS08KA2 sacrifices RTC and LCD integration for footprint and cost reduction, while MC9S08LG32 trades IRSCI and LCD driver for USB and larger memory - making MC68HC908LK24CFQ uniquely suited for self-contained, IR-configurable, time-aware display systems.
Availability
MC68HC908LK24CFQ is available at Aetrix Electronics and suitable for industrial panel meters, portable medical monitors, smart thermostats, and energy submeters requiring stable component supply across extended production lifecycles.
Supply support for MC68HC908LK24CFQ 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.
The MC68HC908LK24CFQ belongs to the HCS08 microcontroller family, designed specifically for cost-sensitive, low-power embedded systems requiring integrated RTC, LCD, and infrared communication - especially in utility metering and portable instrumentation.
FAQ
What is the maximum operating frequency of the MC68HC908LK24CFQ?
The MC68HC908LK24CFQ supports a maximum bus frequency of 8 MHz, achieved via its internal clock generator module (CGM) with PLL multiplication. This frequency is sustained across the full 2.7–5.5 V supply range and ambient temperatures from –40°C to +85°C, enabling deterministic real-time response in control applications without external clock sources.
Does the MC68HC908LK24CFQ support in-system programming (ISP)?
Yes, the MC68HC908LK24CFQ supports in-system programming via its built-in Monitor ROM (MON), accessible through the IRSCI interface or standard SCI UART. The MON provides routines for FLASH page erase, program, and verification - allowing field firmware updates without removing the device from the PCB.
How many LCD segments can the MC68HC908LK24CFQ drive directly?
The MC68HC908LK24CFQ drives up to 32 LCD segments using its integrated LCD driver, configured via BP0–BP2 (3 backplanes) and FP0–FP32 (32 frontplanes). It supports static, 2-, 3-, and 4-mux multiplexing schemes, eliminating the need for external LCD controllers in compact display applications.
What RTC calibration resolution does the MC68HC908LK24CFQ provide?
The MC68HC908LK24CFQ provides RTC calibration with ±1 ppm resolution via the 8-bit RTCCDAT register, allowing fine-tuning of the 32.768 kHz crystal oscillator to compensate for temperature drift and component tolerance - critical for applications requiring long-term time accuracy without GPS or network sync.
Is the MC68HC908LK24CFQ pin-compatible with other members of the LK24 family?
Yes, the MC68HC908LK24CFQ shares identical pinout and electrical characteristics with other LK24 variants (e.g., MC68HC908LK24CP, MC68HC908LK24CFA), differing only in packaging (QFP vs. LQFP vs. TQFP) and temperature grade. This allows drop-in replacement across qualified versions without PCB redesign.
MC68HC908LK24CFQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 80-QFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- I2C, IRSCI, SPI
- Peripherals:
- LCD, LVD, POR, PWM
- Number of I/O:
- 40
- Program Memory Size:
- 24KB (24K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 768 x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 6x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908LK24CFQ FAQ
1.How can I place an order for MC68HC908LK24CFQ through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908LK24CFQ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MC68HC908LK24CFQ reliable?
The price and inventory of MC68HC908LK24CFQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908LK24CFQ is usually 5 days.
3.What payment methods are accepted for MC68HC908LK24CFQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908LK24CFQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908LK24CFQ?
MC68HC908LK24CFQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908LK24CFQ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MC68HC908LK24CFQ?
For technical support, including MC68HC908LK24CFQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908LK24CFQ requirements.
6.How does Aetrix verify that MC68HC908LK24CFQ is sourced from the original manufacturer or authorized distributors?
All MC68HC908LK24CFQ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MC68HC908LK24CFQ meets industry standards.
7.What is the process for return or replacement of MC68HC908LK24CFQ?
All MC68HC908LK24CFQ units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908LK24CFQ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MC68HC908LK24CFQ part is unused and in its original packaging.
Return procedure for MC68HC908LK24CFQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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