MC68HC908LK24CPK - 8MHz 8-bit HC08 MCU 24KB FLASH 80-LQFP | NXP
MPN: MC68HC908LK24CPK ✗ Cuối đờiMC68HC908LK24CPK Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripheral interfaces on one die. The M68HC08 family is based on NXP's (formerly Freescale) Customer-Specified Integrated Circuit (CSIC) design strategy, allowing the same CPU08 core to be paired with different peripheral mixes and memory sizes. The 8-bit MCU category sits at the entry level of the embedded computing hierarchy - above simple logic devices but below 32-bit microcontrollers - and is widely used in cost-sensitive consumer, appliance, and industrial control products where deterministic behavior and low power matter more than raw compute throughput.
Key features include 24KB FLASH (24K x 8) of in-application reprogrammable program memory, 768 bytes of on-chip RAM, a built-in LCD driver supporting segment displays typical of appliance front panels, 40 multifunctional I/O pins, and a 2.1V brown-out / low-voltage detect (LVD) with power-on reset (POR). Multiple communication interfaces (I2C, SPI, IRSCI) enable connection to sensors, EEPROMs, and host processors without external glue logic.
The HC08 CPU08 core provides an enhanced instruction set relative to the legacy HC05 family, including a STOP and WAIT low-power mode, hardware multiply (MUL) in two cycles, and a 16-bit index register. The integrated LCD controller can drive up to 40 segments directly, eliminating the need for an external LCD driver in many human-machine-interface designs.
Typical applications include white-goods control boards (washing machines, microwave ovens, dishwashers), remote controls, simple metering and instrumentation, smart thermostats, and any HMI product that needs a segment LCD and modest compute. The combination of FLASH, RAM, LCD, and PWM in one package is particularly attractive for motor-control sub-systems with on-screen feedback.
When designing with this MCU, plan the LCD segment allocation against the available I/O budget (40 pins, some shared with LCD segments) and ensure the supply rail stays above the LVD threshold (3V typical) during cold-start inrush. Program FLASH in-circuit via the built-in monitor ROM to avoid external programmer cost.
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MC68HC908LK24CPKE
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MC68HC908LK24CPK
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| Core Processor | HC08 |
| Core Size | 8-Bit |
| Tần số xung maksimum | 8 MHz |
| Program Memory Size | 24 KB (24K x 8) FLASH |
| Program Memory Type | FLASH |
| RAM Size | 768 B |
| EEPROM Size | None |
| Number of I/O | 40 |
| Connectivity | I2C, IRSCI, SPI |
| Peripherals | LCD, LVD, POR, PWM |
| Hộp | 80-LQFP (12x12 mm) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Non-Compliant |
| Part Status | Obsolete |
| Series | HC08 |
Hướng dẫn cấu hình chân MC68HC908LK24CPK 80-lqfp (12x12 mm)
Cấu hình chân cho MC68HC908LK24CPK (80-lqfp (12x12 mm) gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho MC68HC908LK24CPK.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
MC68HC908LK24CPK phù hợp cho 6 Áp dụngs: White-Goods Control Boards, Smart Thermostats and HVAC Controllers, Remote Control and IR-Enabled Appliances, Simple Metering and Instrumentation, Industrial Sensor Interfaces and HMI Panels, Consumer Battery-Powered Devices.
White-Goods Control Boards
The MC68HC908LK24CPK fits washing-machine, dishwasher, and microwave-oven main control boards because its integrated LCD driver (up to 40 segments) drives the front-panel display directly, while PWM channels control motor and valve actuation. The 24 KB FLASH holds appliance state-machine firmware plus fault logs, and 768 bytes of RAM is sufficient for sensor polling and timer management. The 8 MHz CPU08 core executes control loops in microseconds - more than fast enough for relay sequencing, temperature profiling, and buzzer control. The I2C and SPI peripherals let the MCU talk to EEPROM for parameter storage and to digital temperature/humidity sensors without external glue logic.
Được đề xuất
Smart Thermostats and HVAC Controllers
The MC68HC908LK24CPK suits residential thermostat and HVAC controller designs because its on-chip LCD driver eliminates the external display driver chip that would otherwise be required. The HC08 core has a STOP and WAIT low-power mode that drops quiescent current during sleep, allowing the MCU to wake on a button interrupt or low-frequency timer - critical for battery-backed thermostats. The 40 I/O lines accommodate multiple buttons, a rotary encoder, setpoint EEPROM backup, and triac-driven fan control via PWM. The integrated LVD/POR ensures clean startup after brown-outs caused by compressor inrush.
Được đề xuất
Remote Control and IR-Enabled Appliances
The MC68HC908LK24CPK is well matched to remote controls and IR-enabled home appliances because it integrates an Infrared Serial Communications Interface (IRSCI) that drives an IR LED directly with carrier modulation, eliminating an external IR transmitter IC. The HC08 FLASH (24 KB) accommodates complex protocol stacks (RC5, NEC, SIRC) plus device-specific command libraries. The 768-byte RAM and 40 I/O are sufficient for keypad scanning, status LEDs, and a small segment LCD showing channel or setpoint. The 8 MHz bus executes real-time protocol bit-banging with comfortable timing margins.
Được đề xuất
Simple Metering and Instrumentation
The MC68HC908LK24CPK supports low-cost metering designs (water, gas, electricity sub-meters, environmental monitors) by combining a precise timer-driven ADC sampling loop on the HC08 core, on-chip LCD for local readout of consumption, and I2C/SPI for an external communication module. The 24 KB FLASH is enough for tariff scheduling, peak detection, and logging algorithms. The integrated POR/LVD handles unreliable battery or harvested-power rails cleanly, while STOP mode extends battery life between measurement cycles. The 8 MHz instruction cycle enables 10-bit-equivalent oversampling for better than the native ADC resolution.
Được đề xuất
Industrial Sensor Interfaces and HMI Panels
The MC68HC908LK24CPK drives small industrial HMI panels with segment LCDs (pumps, controllers, simple machine status displays). Its 40 GPIO handle push-button inputs, indicator LEDs, relay outputs, and an RS-485 transceiver via UART, while the SPI bus connects to a DAC for analog setpoint output. The 24 KB FLASH holds ladder-logic replacement code and menu navigation; 768 bytes RAM is adequate for menu state. The HC08's deterministic instruction timing simplifies EMC and surge-immunity certification because execution paths are predictable, unlike cache-based 32-bit MCUs.
Được đề xuất
Consumer Battery-Powered Devices
The MC68HC908LK24CPK serves consumer battery-powered devices (handheld tools, portable toys, simple medical monitors) where its integrated LCD, low STOP-mode current, and FLASH reprogrammability enable compact, low-BOM designs. The HC08 STOP mode drops the CPU clock while leaving peripherals and RAM retention active, allowing wake-on-button designs that extend battery life to months. The on-chip PWM generates variable-speed motor control or LED brightness without external circuitry, and I2C connects to a small accelerometer or ambient-light sensor. The 80-LQFP package remains hand-solderable for low-volume prototypes.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68HC908LK24CPK — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | MC68HC908LK24CPKE |
|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors |
| Package | 80-LQFP (12x12 mm) | 80-LQFP (12x12 mm) - same |
| Core | HC08 (CPU08) | HC08 (CPU08) |
| Clock Speed | 8 MHz | 8 MHz |
| FLASH Memory | 24 KB | 24 KB |
| RAM Size | 768 B | 768 B |
| I/O Pins | 40 | 40 |
| RoHS Compliance | Non-Compliant | Compliant |
| Lifecycle Status | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Integrated LCD driver eliminates external display IC (vsMC68HC908LJ24CPB (84-pin non-LCD variant))
- Mature HC08 toolchain with abundant example code (vsMC9S08LG32 (HCS08 successor))
- Single-chip motor and display control (vsPIC16F877A (Microchip 8-bit))
Ghi chú thiết kế
The MC68HC908LK24CPK operates from a single VDD rail (3.0V typical, range per datasheet - confirm against MC68HC908LJ24 family document). The on-chip LVD/POR holds the part in reset until VDD crosses the LVD threshold; add a 100 nF ceramic decoupling capacitor adjacent to each VDD/VSS pin pair and a bulk 10 uF tantalum or ceramic at the regulator output. Avoid using the same regulator rail that drives inductive loads (relays, solenoids) to prevent MCU resets during switch-off transients.
For the 80-LQFP package with 0.5 mm pitch, route signal traces on inner layers and use a 4-layer PCB with continuous ground plane under the part to simplify EMC compliance. The exposed-pad variant is not present on this LQFP, so thermal dissipation is not a concern at HC08 power levels (under 50 mA active). Keep LCD segment traces short and away from PWM outputs to prevent capacitive coupling that causes ghost segments.
Do not assume pin-for-pin compatibility with the MC68HC908LJ24 (84-pin) or other HC08 LCD variants - the LK24 has 80 pins and the LCD segment routing differs. Verify the alternate's pin count matches your PCB footprint before substituting. Also, the HC08's monitor ROM occupies the top of the address space, so user firmware must be linked to start below this region or vector fetch will fail. Finally, the part is RoHS non-compliant; for new designs, choose the lead-free equivalent MC68HC908LK24CPKE or migrate to HCS08 (MC9S08LG32).
Thông tin tuân thủ
RoHS non-compliant per DigiKey product data; uses lead-bearing finish from original Freescale production era. Choose MC68HC908LK24CPKE for RoHS-compliant equivalent. Part is Obsolete, so AEC-Q100 automotive qualification is not applicable.