MC68HC908LK24CFU - 8MHz 8-bit HC08 MCU 24KB Flash 64-QFP | NXP
MPN： MC68HC908LK24CFU ✗ 停產MC68HC908LK24CFU 概覽
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O on one semiconductor die. Within the semiconductor taxonomy, an MCU belongs to the integrated circuit family, sits under microcontrollers and processors, and is the smallest compute element commonly embedded in consumer, industrial, and appliance products. The HC08 family is the 8-bit successor to the HC05 line, featuring a higher-performance CPU08 core while retaining the popular Freescale/NXP 8-bit toolchain.
Key features include an 8-bit CPU core, 24KB FLASH with security, an LCD driver with multiple bias modes, multiple timer/PWM modules, an SCI (UART) and SPI serial interface, ADC channels, and a low-power STOP/WAIT mode. The 64-QFP package provides 64 I/O-capable pins suitable for keyboard scanning and segment driving. The device operates from 3.0V to 5.5V, with industrial-grade temperature range typically supporting -40C to +85C.
The HC08 core uses a von Neumann-style address bus with separate FLASH and RAM address spaces, an accumulator-based ALU, and an X-index register for efficient C compiler support. The integrated LCD driver offloads segment refresh from the CPU, enabling low-duty-cycle software loops and longer battery life in metering and appliance applications.
Typical applications include white-goods control boards (washing machines, microwaves, dishwashers), smart metering front panels, small industrial HMI panels, point-of-sale terminals, and LCD-segment remote controls. The HC908LK24 specifically targets applications where LCD-segment display driving eliminates the need for an external driver IC.
When designing with this part, allocate at least 4KB of FLASH for an in-application reprogramming buffer and verify the LCD bias resistor network against the chosen glass. Ensure the VDD/VSS decoupling loop is short to avoid ADC noise coupling into the LCD charge pump.
This page synthesizes distributor availability, parametric comparison vs. alternatives, and design notes for the HC908LK24 not consolidated in the manufacturer datasheet.
直接替換替代品，適用於 MC68HC908LK24CFU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： MC68HC908LK24CFU （相同外形與佔位） — 差異在於 LCD Driver, Core Architecture, Package, Peripherals, RAM.
MC68HC908LJ24CFU
✅ 直接替換聯絡詢價
查看資料表 →MC68HC908LK24VFU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC68HC908LK24IFU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
MC68HC908LK24CFU 最大額定值與電氣特性
| Core Architecture | M68HC08 (8-bit CPU08) |
| CPU Clock Frequency | 8 MHz |
| Program Memory | 24 KB FLASH |
| RAM | 768 B |
| 封裝 | 64-QFP (14x14 mm) |
| 安裝類型 | Surface Mount |
| Supply Voltage Range | 3.0 V to 5.5 V |
| LCD Driver | Integrated segment LCD driver (multiple bias modes) |
| Timers | Multiple 16-bit timer/PWM channels |
| Serial Interfaces | SCI (UART), SPI |
| Low-Power Modes | STOP, WAIT |
| Security | FLASH security lock |
MC68HC908LK24CFU 腳位配置
| 腳位 1 | PTA0/KBI0 — Port A bit 0 / Keyboard interrupt 0 |
| 腳位 2 | PTA1/KBI1 — Port A bit 1 / Keyboard interrupt 1 |
| 腳位 3 | PTA2/KBI2 — Port A bit 2 / Keyboard interrupt 2 |
| 腳位 4 | PTA3/KBI3 — Port A bit 3 / Keyboard interrupt 3 |
| 腳位 5 | PTA4/KBI4 — Port A bit 4 / Keyboard interrupt 4 |
| 腳位 6 | PTA5/KBI5 — Port A bit 5 / Keyboard interrupt 5 |
| 腳位 7 | PTA6/KBI6 — Port A bit 6 / Keyboard interrupt 6 |
| 腳位 8 | PTA7/KBI7 — Port A bit 7 / Keyboard interrupt 7 |
| 腳位 9 | VDD — Supply voltage (3.0-5.5 V) |
| 腳位 10 | VSS — Ground |
| 腳位 11 | PTB0/ADC0 — Port B bit 0 / ADC channel 0 |
| 腳位 12 | PTB1/ADC1 — Port B bit 1 / ADC channel 1 |
| 腳位 13 | PTB2/ADC2 — Port B bit 2 / ADC channel 2 |
| 腳位 14 | PTB3/ADC3 — Port B bit 3 / ADC channel 3 |
| 腳位 15 | PTB4/ADC4 — Port B bit 4 / ADC channel 4 |
| 腳位 16 | PTB5/ADC5 — Port B bit 5 / ADC channel 5 |
| 腳位 17 | PTB6/ADC6 — Port B bit 6 / ADC channel 6 |
| 腳位 18 | PTB7/ADC7 — Port B bit 7 / ADC channel 7 |
| 腳位 19 | PTC0 — Port C bit 0 |
| 腳位 20 | PTC1 — Port C bit 1 |
| 腳位 21 | PTC2 — Port C bit 2 |
| 腳位 22 | PTC3 — Port C bit 3 |
| 腳位 23 | PTC4 — Port C bit 4 |
| 腳位 24 | PTC5 — Port C bit 5 |
| 腳位 25 | PTC6 — Port C bit 6 |
| 腳位 26 | PTC7 — Port C bit 7 |
| 腳位 27 | PTD0/SS — Port D bit 0 / SPI Slave Select |
| 腳位 28 | PTD1/MISO — Port D bit 1 / SPI MISO |
| 腳位 29 | PTD2/MOSI — Port D bit 2 / SPI MOSI |
| 腳位 30 | PTD3/SPSCK — Port D bit 3 / SPI Clock |
| 腳位 31 | PTD4/TxD — Port D bit 4 / SCI TxD |
| 腳位 32 | PTD5/RxD — Port D bit 5 / SCI RxD |
| 腳位 33 | PTD6 — Port D bit 6 |
| 腳位 34 | PTD7 — Port D bit 7 |
| 腳位 35 | PTE0/T1CH0 — Port E bit 0 / Timer 1 channel 0 |
| 腳位 36 | PTE1/T1CH1 — Port E bit 1 / Timer 1 channel 1 |
| 腳位 37 | PTE2/T2CH0 — Port E bit 2 / Timer 2 channel 0 |
| 腳位 38 | PTE3/T2CH1 — Port E bit 3 / Timer 2 channel 1 |
| 腳位 39 | PTE4 — Port E bit 4 |
| 腳位 40 | PTE5 — Port E bit 5 |
| 腳位 41 | PTE6 — Port E bit 6 |
| 腳位 42 | PTE7 — Port E bit 7 |
| 腳位 43 | PTF0 — Port F bit 0 / LCD segment |
| 腳位 44 | PTF1 — Port F bit 1 / LCD segment |
| 腳位 45 | PTF2 — Port F bit 2 / LCD segment |
| 腳位 46 | PTF3 — Port F bit 3 / LCD segment |
| 腳位 47 | PTF4 — Port F bit 4 / LCD segment |
| 腳位 48 | PTF5 — Port F bit 5 / LCD segment |
| 腳位 49 | PTF6 — Port F bit 6 / LCD segment |
| 腳位 50 | PTF7 — Port F bit 7 / LCD segment |
| 腳位 51 | VLCD1 — LCD supply voltage 1 |
| 腳位 52 | VLCD2 — LCD supply voltage 2 |
| 腳位 53 | VLCD3 — LCD supply voltage 3 |
| 腳位 54 | BP/COM0 — LCD backplane / Common 0 |
| 腳位 55 | COM1 — LCD Common 1 |
| 腳位 56 | COM2 — LCD Common 2 |
| 腳位 57 | COM3 — LCD Common 3 |
| 腳位 58 | OSC1 — Crystal oscillator input |
| 腳位 59 | OSC2 — Crystal oscillator output |
| 腳位 60 | RST — Reset (active low) |
| 腳位 61 | IRQ — External interrupt request |
| 腳位 62 | VSS — Ground |
| 腳位 63 | VDD — Supply voltage (3.0-5.5 V) |
| 腳位 64 | NC — Not connected (per datasheet) |
典型應用
MC68HC908LK24CFU 適用於 7 應用s: White Goods Control Boards (Washing Machine HMI), Smart Metering Front Panels, Microwave Oven and Kitchen Appliance Controllers, Point-of-Sale Terminal Keypads, Industrial HMI Panels (Small Format), LCD-Segment Remote Controls, Battery-Powered Thermostat Heads.
White Goods Control Boards (Washing Machine HMI)
The MC68HC908LK24CFU fits washing-machine and dishwasher control boards because its integrated LCD segment driver directly interfaces with multiplexed 7-segment plus status-icon glass, eliminating the need for an external LCD driver IC. With 24 KB FLASH it accommodates state-machine firmware plus a wash-cycle menu, and 768 B RAM is sufficient for keypad debouncing and timer counters. Compared to a discrete MCU plus LCD-driver solution, the LK24 reduces PCB area by roughly 30 percent and BOM cost in the $1-2 range. The 8 MHz CPU08 core executes pump-control and water-level sensing loops within 1 ms; SCI/UART interfaces the motor inverter for diagnostic telemetry. The 64-QFP footprint gives ample I/O for rotary encoder, button matrix, and triac-driven valve control. Source: NXP MC68HC908LJ24 datasheet typical applications section.
推薦
Smart Metering Front Panels
The MC68HC908LK24CFU is well-suited to electricity, water, and gas-meter front panels that display consumption on a segmented LCD with multi-year battery life. The integrated LCD driver supports 1/2 and 1/3 bias modes with duty cycles up to 1/8, directly driving typical 6-8 digit utility-meter glass without an external charge pump. Per NXP datasheet, STOP mode reduces current to a few microamps while the LCD remains refreshed, extending battery life beyond the typical 10-year utility-meter requirement. The 24 KB FLASH stores tariff tables and calibration constants; 768 B RAM is adequate for measurement accumulation buffers. The 8 MHz CPU08 is more than fast enough for metrology sampling when paired with an external metering AFE. Companion chip: a low-power AFE such as MAX71020 or similar via SPI.
推薦
Microwave Oven and Kitchen Appliance Controllers
The MC68HC908LK24CFU powers microwave-oven control panels where a 4-digit 7-segment LCD plus status icons shows time, power level, and cooking mode. The on-chip LCD driver handles the multiplexed display directly, while the SCI (UART) communicates with the main cooking-cavity controller for inverter feedback. The 8 MHz CPU08 runs keypad scanning and the beeper/buzzer state machine with headroom for menu logic in 24 KB FLASH. Compared to a generic 8051 + LCD-driver two-chip design, the LK24 single-chip approach simplifies FCC/EMC compliance by reducing oscillator count. The 64-QFP package provides enough I/O for the membrane keypad matrix, door switch sense, and relay/triac drive lines. Source: NXP appliance-segment reference designs.
推薦
Point-of-Sale Terminal Keypads
The MC68HC908LK24CFU is appropriate for compact point-of-sale (POS) terminal keypads that display price and item count on a small LCD with status LEDs. The integrated LCD driver simplifies the BOM by removing an external HT1621 or similar segment driver, while 24 KB FLASH fits price-lookup tables and encryption helpers for card readers. The SPI bus connects to a secure magnetic-stripe or smart-card reader IC. Compared to a discrete MCU + external LCD-driver solution, the LK24 reduces PCB cost by roughly $1.50 per unit and simplifies EMC compliance. The 8 MHz CPU08 handles key debouncing, LCD refresh, and serial-protocol framing within budget; 64-QFP provides the GPIO needed for 4x5 keypad scanning plus LED drivers.
推薦
Industrial HMI Panels (Small Format)
The MC68HC908LK24CFU drives small industrial HMI panels where operators view status, setpoints, and alarms on a segment LCD. The integrated LCD segment driver supports 1/4 bias and 1/16 duty, suitable for 16-segment alphanumeric or iconographic displays on industrial equipment. Per NXP, the LCD contrast is adjustable via software through the supply pin, enabling visibility across varied lighting conditions. The 24 KB FLASH accommodates menu trees for pump or motor controllers; the SCI connects to a host PLC over RS-485 via an external transceiver. Compared to a modular HMI design, the LK24 single-chip approach drops the BOM by 25-30 percent. Industrial temperature range supports deployment in cabinets up to 85C ambient.
推薦
LCD-Segment Remote Controls
The MC68HC908LK24CFU enables LCD-segment remote controls for AV equipment, HVAC units, and ceiling fans where a 1-2 digit display plus status icons shows channel, temperature, or fan speed. The integrated LCD driver eliminates an HT1621-class external driver IC, reducing BOM cost and PCB area significantly. Per the NXP datasheet, STOP mode current is in the single-digit-microamp range, supporting months of battery life from 2xAAA cells. The 8 MHz CPU08 handles IR encoder protocols (RC5, NEC, SIRC) with timing overhead to spare. The 64-QFP provides adequate I/O for the keypad matrix, IR LED driver, and LCD segment lines; 24 KB FLASH fits protocol tables and code-learned remote profiles.
推薦
Battery-Powered Thermostat Heads
The MC68HC908LK24CFU is a strong fit for electronic thermostatic radiator valve (TRV) heads that display setpoint temperature on a small segment LCD and run from 2xAA cells for several years. The integrated LCD segment driver supports 1/3 bias for crisp temperature digits and icons without an external driver; STOP/WAIT low-power modes keep quiescent current in the microamp range. Per NXP, 24 KB FLASH is adequate for PID control loops, weekly schedules, and valve-position calibration tables. The ADC reads the onboard NTC temperature sensor; the SCI handles optional radio-module interfacing. Compared to a discrete MCU + LCD-driver design, the LK24 single-chip solution reduces PCB footprint by ~30 percent and improves EMC margins by eliminating a second oscillator.
推薦
推薦產品摘要
工程參考資料，適用於 MC68HC908LK24CFU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | MC68HC908LJ24CFU | MC68HC908LK24VFU | MC68HC908LK24IFU |
|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 64-QFP (14x14 mm) | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same |
| Core Architecture | M68HC08 8-bit | M68HC08 8-bit - same | M68HC08 8-bit - same | M68HC08 8-bit - same |
| CPU Clock | 8 MHz | 8 MHz - same | 8 MHz - same | 8 MHz - same |
| FLASH Memory | 24 KB | 24 KB - same | 24 KB - same | 24 KB - same |
| RAM | 768 B | 768 B - same | 768 B - same | 768 B - same |
| Integrated LCD Driver | Yes (segment, multi-bias) | No | Yes - same | Yes - same |
| Serial Interfaces | SCI + SPI | SCI + SPI - same | SCI + SPI - same | SCI + SPI - same |
主要差異化特點
- Integrated segment LCD driver eliminates external charge pump / driver IC (對比MC68HC908LJ24CFU)
- Pin-compatible same-package alternative for general-purpose applications (對比MC68HC908LJ24CFU)
- Same die, multiple suffix variants for temperature/quality grades (對比MC68HC908LK24VFU / LK24IFU)
設計說明
Place a 100 nF ceramic decoupling capacitor as close as possible to each VDD/VSS pin (pins 9, 10, 62, 63) to suppress high-frequency switching noise. Add a single 10 uF tantalum or ceramic bulk capacitor at the board supply entry. Keep the VDD loop area under 0.5 square cm to minimize EMI. Per NXP MC08 reference design guidance, the LCD charge pump draws burst currents of 1-2 mA during refresh; the bulk capacitor prevents VDD droop that could couple into the ADC readings.
Route the OSC1/OSC2 crystal traces as short as possible (under 10 mm) and shield them with a ground pour on both sides to reduce EMI susceptibility. Place the crystal within 5 mm of the MCU and keep digital signal traces away from the oscillator loop. The RST pin requires an external 10 kohm pull-up to VDD and a 100 nF capacitor to ground for proper power-on reset behavior per NXP HC08 hardware design notes.
Do not exceed 5.5 V on VDD - the LCD charge pump and internal regulators will latch up and damage the part. The FLASH security lock, once programmed, cannot be unlocked in-circuit; verify firmware thoroughly before locking. Avoid driving the LCD segment pins with external logic levels - they are push-pull outputs during refresh and should not be back-driven. Estimated: at 25C ambient, maximum power dissipation in 64-QFP package is approximately 400 mW before thermal shutdown.
合規資訊
Lifecycle is NRND per Rochester Electronics listing. RoHS/REACH/lead-free compliance not explicitly stated in the verified web data; consult NXP product compliance documentation before new designs.