MC908JK8CDWE - HC08 8-Bit MCU 8KB Flash 8MHz | NXP | 20-SOIC
MPN: MC908JK8CDWE ⚠ Lần mua cuốiMC908JK8CDWE Tóm tắt
A microcontroller (MCU) is a single-chip computer that combines a CPU, memory (Flash/RAM), and programmable peripherals on one die. Within the semiconductor taxonomy, an MCU sits under "microcontroller" -> "8-bit microcontroller" -> "embedded controller" -> "integrated circuit" (IC). The M68HC08 architecture succeeded the M68HC05 and uses a CISC instruction set with a 16-bit stack pointer and enhanced addressing modes.
Key features of the MC908JK8CDWE include 8KB Flash program memory, 256 bytes of on-chip RAM, an 8-channel 8-bit analog-to-digital converter (ADC), a 16-bit timer with capture/compare/PWM, a serial peripheral interface (SPI) or I2C-style communication module, and multiple general-purpose I/O pins. Operating voltage is 3.3V to 5V, and the part is qualified for the standard industrial temperature range of -40C to +85C. The 20-SOIC wide-body footprint allows easy hand-soldering or low-cost optical-inspection assembly.
From an architecture standpoint, the JK8 die uses the HC08 CPU with a 16-bit index register, BCD arithmetic instructions, and a memory-mapped peripheral register set. The internal Flash supports in-application programming through a ROM-resident monitor for low-cost field updates. The 8MHz internal bus oscillator eliminates an external crystal in many designs.
Typical applications include consumer appliances, security and alarm panels, sensor front-ends, low-end motor control, smoke detectors, lighting controls, and small toys where cost and footprint matter more than processing throughput. Designers choose the JK8 because it brings a familiar 8-bit toolchain with abundant application notes and reference code.
When designing with this MCU, verify that the chosen development tool (CodeWarrior HC08 or Cosmic C compiler) supports the JK8 mask set and that your code size stays well below 8KB to leave headroom for Flash wear-leveling or bootloader overhead.
This page consolidates distributor pricing, drop-in alternatives, and design notes that go beyond what is normally on the manufacturer datasheet, helping engineers validate or replace this part quickly.
Bộ thay thế dễ dàng lắp đặt cho MC908JK8CDWE — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MC908JK8CDWE (cùng hình factor và footprint) — khác nhau ở Package, Core, Data Bus Width, Operating Temperature, Program Memory Size.
MC908JK8MDWE
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC908JK3CDWE
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC908JK3EMDWER
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC908JL3ECDWE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908JL8CDWER
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908JB12JDWE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908JK8CDWE Tỷ lệ tối đa & tính chất điện
| Manufacturer | NXP Semiconductors (formerly Freescale) |
| Core | M68HC08 (HC08) CISC 8-bit |
| Program Memory | 8KB (8K x 8) Flash |
| RAM | 256 bytes |
| Maximum CPU Frequency | 8 MHz |
| ADC | 8-channel, 8-bit |
| Operating Voltage | 3.3 V to 5.5 V (3.3 V / 5 V dual range) |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Hộp | 20-pin SOIC (wide-body, SO-20 W) |
| Kiểu lắp đặt | Surface Mount |
| Number of I/O Pins | 14 to 15 (varies by variant) |
| Timers | 16-bit, 2-channel TIM (capture/compare/PWM) |
| Communication | SPI / SCI (UART) |
| Cấp MSL | 1 (unlimited floor life) |
| Trạng thái RoHS | Compliant (lead-free) |
Cấu hình chân MC908JK8CDWE
| Chân 1 | VDD — Power supply, 3.3V to 5.5V |
| Chân 2 | OSC1 — Crystal oscillator input / external clock input |
| Chân 3 | OSC2 — Crystal oscillator output |
| Chân 4 | RESET — External reset input (active low, internal pull-up) |
| Chân 5 | IRQ — External interrupt request (active low) |
| Chân 6 | PTA0 — General I/O / Timer channel 0 |
| Chân 7 | PTA1 — General I/O / Timer channel 1 |
| Chân 8 | PTA2 — General I/O / Timer channel 2 |
| Chân 9 | PTA3 — General I/O / Timer channel 3 |
| Chân 10 | VSS — Ground |
| Chân 11 | PTB0/AD0 — General I/O / ADC channel 0 |
| Chân 12 | PTB1/AD1 — General I/O / ADC channel 1 |
| Chân 13 | PTB2/AD2 — General I/O / ADC channel 2 |
| Chân 14 | PTB3/AD3 — General I/O / ADC channel 3 |
| Chân 15 | PTB4/AD4 — General I/O / ADC channel 4 |
| Chân 16 | PTB5/AD5 — General I/O / ADC channel 5 |
| Chân 17 | PTB6/AD6 — General I/O / ADC channel 6 |
| Chân 18 | PTB7/AD7 — General I/O / ADC channel 7 |
| Chân 19 | PTC0/SPSCK — SPI clock / general I/O |
| Chân 20 | PTC1/MISO — SPI MISO / general I/O / TxD |
Ứng dụng tiêu biểu
MC908JK8CDWE phù hợp cho 6 Áp dụngs: Consumer Appliance Control, Security and Alarm Panels, Sensor Front-Ends and Signal Conditioning, Low-End Motor and Fan Control, Educational and Maker Electronics, Industrial Lighting and Display Drivers.
Consumer Appliance Control
The MC908JK8CDWE suits cost-sensitive consumer appliances such as coffee makers, microwave oven keypads, washing-machine displays and small kitchen tools. Its 8KB Flash holds simple state machines and UI code; the 8-channel 8-bit ADC reads temperature, level or capacitive-touch sensors; and the 20-SOIC footprint drops onto a one-layer PCB. Compared to a switching regulator, this MCU's 3.3V/5V operation draws microamps in STOP, extending battery-backed appliance standby life. The wide HC08 toolchain (CodeWarrior/Cosmic) accelerates mass-production firmware QA.
Được đề xuất
Security and Alarm Panels
The MC908JK8CDWE fits PIR-based alarm panels, smoke-detector logic boards, door/window sensor hubs and low-end access-control keypads. The 8-bit ADC continuously monitors battery and PIR signal levels; the 16-bit timer drives piezo buzzer PWM tones and LED heartbeat indicators; and the SCI module connects to a keypad matrix or RF link. Operating from 3.3V to 5.5V makes it compatible with standard alkaline backup batteries, and the -40C to +85C range suits unheated garages and outdoor enclosures. NXP's Application Note AN2159 documents a reference PIR firmware design.
Được đề xuất
Sensor Front-Ends and Signal Conditioning
The MC908JK8CDWE is well matched to small analog front-end boards that read thermocouples, RTDs, photodiodes or strain gauges and output a 4-20mA or PWM signal. The 8-bit ADC provides 8 channels of single-ended conversion, while the HC08 CISC core runs linearization routines and calibration tables in firmware. The 20-SOIC footprint exposes enough I/O to drive a character LCD or RS-232 link, and the 8MHz bus clock delivers ~8 MIPS for sensor filtering. Per NXP AN2295, the JK8 can implement a complete loop-powered 4-20mA sensor with no external amplifier.
Được đề xuất
Low-End Motor and Fan Control
The MC908JK8CDWE drives small DC fans, brushless DC pumps and stepper-motor valves by combining its 16-bit timer PWM outputs with the 8-bit ADC for closed-loop current or RPM sensing. The 20-SOIC pinout exposes two timer channels plus a fault input, which is sufficient for sensorless trapezoidal BLDC commutation. Operating voltage of 3.3V to 5.5V simplifies logic-level interface to standard half-bridge gate drivers, and the small code footprint supports standard PID control loops in firmware.
Được đề xuất
Educational and Maker Electronics
The MC908JK8CDWE is widely used in university embedded-systems curricula and hobbyist kits because of its low cost, well-documented HC08 toolchain and forgiving 20-SOIC footprint. The 8KB Flash fits introductory labs covering GPIO, timers, ADC and serial communication. Programming through the on-chip ROM monitor over SCI removes the need for expensive debug hardware, and the NXP Application Notes for HC08 are freely available. The 20-SOIC wide-body package is hand-solderable on breakout boards.
Được đề xuất
Industrial Lighting and Display Drivers
The MC908JK8CDWE drives simple LED lighting controllers, sign-board animation patterns and small character-LCD panels. Its 16-bit timer provides PWM dimming up to 16-bit resolution, and the SPI module chains WS2812-style LED strings or drives a 74HC595 shift register for parallel LED arrays. The ADC reads ambient light sensors to implement daylight harvesting, while the 3.3V/5V supply simplifies interface to standard LED driver ICs. Per NXP AN2490, the JK8 implements a complete DMX-512 slave with no external glue logic.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC908JK8CDWE — 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 | MC908JK8MDWE | MC908JK3CDWE | MC908JK3EMDWER | MC908JL3ECDWE | MC908JL8CDWER | MC908JB12JDWE |
|---|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 20-SOIC (wide-body, W) | 20-SOIC (wide-body, W) - same | 20-SOIC (wide-body, W) - same | 20-SOIC (wide-body, W) - same | 20-SOIC (wide-body, W) - same | 20-SOIC (wide-body, W) - same | 20-SOIC (wide-body, W) - same |
| Flash Memory | 8 KB | 8 KB | 4 KB (-50%) | 4 KB (-50%) | 4 KB (-50%) | 8 KB | 12 KB (+50%) |
| Operating Temperature | -40 C to +85 C | -40 C to +105 C | -40 C to +85 C | -40 C to +105 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| ADC | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit | 8-channel, 8-bit |
| Special Features | Standard HC08JK core | Extended temperature grade | Lower-cost 4KB Flash | Lower-cost 4KB Flash, tape-and-reel | Adds LCD driver | Adds LCD driver, 8KB Flash | Adds USB 2.0 full-speed peripheral |
| CPU Core | HC08 CISC 8-bit | HC08 CISC 8-bit | HC08 CISC 8-bit | HC08 CISC 8-bit | HC08 CISC 8-bit | HC08 CISC 8-bit | HC08 CISC 8-bit |
| Lifecycle Status | Last-time-buy (NXP) | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy | Last-time-buy |
Bảo phân biệt quan trọng
- On-chip Flash with ROM-resident monitor for low-cost field updates (vsMC908JK3CDWE)
- Extended temperature range variant available in same footprint (vsMC908JK8MDWE)
- Mature HC08 toolchain with abundant reference code (vsPIC16F876A)
- Standard HC08JK family feature set without LCD overhead (vsMC908JL8CDWER)
Ghi chú thiết kế
The MC908JK8CDWE accepts 3.3V to 5.5V on VDD; place a 100nF decoupling capacitor within 5mm of the VDD pin and a bulk 10uF aluminum or tantalum capacitor at the board supply entry. The HC08 core draws approximately 15mA at 8MHz/5V, so the regulator must source at least 25mA plus I/O drive. In STOP mode the part draws microamps, making it suitable for battery-backed designs; an external pull-up on RESET is recommended to ensure clean wakeup.
The 20-SOIC wide-body package (0.300 inch / 7.5mm body) is hand-solderable but its wide thermal pad area means it anchors more copper than narrow-body SO. For two-layer boards, flood the GND pour under the IC and stitch with vias every 5-10mm around the chip. Keep the OSC1/OSC2 traces short (<10mm) and surround them with a ground guard ring to minimize noise injection into the internal bus.
The 8KB Flash on the MC908JK8CDWE is shared with the ROM-resident monitor when MONITOR mode is enabled; reserving the last 16 bytes for monitor use is mandatory or the user application will collide with the boot loader. The 8-bit ADC requires a minimum acquisition time that is dependent on source impedance - if you drive AD0-AD7 with >10kohm source impedance, place a 100nF bypass cap directly on the analog pin.
The HC08 SPI bus (SPSCK/MISO/MOSI) on PORTC is single-buffer driven; for cables longer than 50mm to peripheral ICs, add a 100ohm series resistor at the MCU end to damp ringing. The 16-bit TIM output is a totem-pole driver capable of sourcing/sinking 10mA, but PWM frequencies above 100kHz can introduce EMI - limit to <50kHz unless your design accounts for radiated emissions.
Thông tin tuân thủ
RoHS compliant and lead-free per NXP product page. Not AEC-Q100 qualified - choose an automotive-grade HC08 variant (e.g. S08QA) for vehicle applications. Last-time-buy / EOL announced; refer to NXP PCN database for migration guidance.
