MC68HC908JK1CDW - 8-Bit 8MHz MCU 1.5KB Flash | NXP | 20-SOIC
MPN: MC68HC908JK1CDW ✗ Cuối đờiMC68HC908JK1CDW Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM), and peripherals (timers, ADC, communication interfaces) into one IC. Within the broader taxonomy, this part sits at: MCU -> 8-bit microcontroller -> embedded controller -> semiconductor IC. The M68HC08 family in particular succeeded the older M68HC05 architecture with an enhanced M68HC08 central processing unit, supporting a more powerful instruction set with a 16-bit stack pointer and index register while keeping the same low-cost philosophy. The M68HC908JK1 (and the closely related JL3) is the entry-level 20-pin variant aimed at simple control tasks.
Key electrical features of the MC68HC908JK1CDW include a 3V to 5.5V supply operating range (typical 5V), an 8MHz internal bus oscillator, low-power stop and wait modes, an internal real-time interrupt, and an enhanced serial communications interface (ESCI) plus a serial peripheral interface (SPI). On-chip memory map comprises 1.5KB of Flash for application code, 128 bytes of RAM for variables, and 128 bytes of Flash for user vector space. The device integrates a 6-channel, 8-bit analog-to-digital converter (ADC) for sensor interfacing and a 16-bit, 2-channel timer interface module (TIM) for capture/compare/PWM generation.
Typical applications include white-goods control (washing machines, dishwashers), simple sensor acquisition boards, low-cost motor-control user interfaces, remote controls, security keypads, and small appliances. The 20-SOIC footprint and industrial temperature rating allow direct drop-in replacement of legacy M68HC05 designs during migration to the more powerful HC08 instruction set.
A key design consideration when laying out a PCB for the MC68HC908JK1CDW is decoupling: place a 100nF ceramic bypass capacitor as close as possible to each VDD/VSS pair, and add a bulk 10uF tantalum or aluminum electrolytic capacitor near the supply pins. The internal voltage regulator and analog ADC also benefit from a separate AVSS/AVDD pair with its own low-pass filter to reject digital switching noise from corrupting ADC conversions.
The figure commonly cited for the datasheet is approximately 212 pages across the JL3/JK1 datasheet family, providing full electrical specifications, programming model, and peripheral register descriptions. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet itself.
Bộ thay thế dễ dàng lắp đặt cho MC68HC908JK1CDW — 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 MC68HC908JK1CDW (cùng hình factor và footprint) — khác nhau ở Core Architecture, Program Memory Size, RAM Size, Mounting Type, Package.
MC68HC908JK1CP
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC68HC908JK1MDW
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC68HC908JK3CDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68HC908JK8CDW
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68HC908JL3CDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
S08JK1CDW
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MC68HC705J1ACDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MC68HC908JK1CDW Tỷ lệ tối đa & tính chất điện
| Core Architecture | M68HC08 (8-bit) |
| Program Memory | 1.5 KB Flash |
| RAM | 128 B |
| CPU Frequency | 8 MHz |
| Điện áp cung cấp | 3 V to 5.5 V |
| Hộp | 20-SOIC (0.295", 7.50 mm width) |
| Số chân | 20 |
| Kiểu lắp đặt | Surface Mount |
| ADC | 8-bit, 6 channels |
| Timers | 16-bit, 2 channels (TIM) |
| Communication | ESCI (UART) + SPI |
| Nhiệt độ hoạt động | -40 C to +85 C |
| Family | M68HC08 (low-cost, high-performance) |
Cấu hình chân MC68HC908JK1CDW
| Chân 1 | IRQ — External interrupt request input (with internal pull-up) |
| Chân 2 | TCLK — Timer clock input for TIM module |
| Chân 3 | PTA0 — General-purpose I/O port A bit 0 |
| Chân 4 | PTA1 — General-purpose I/O port A bit 1 |
| Chân 5 | PTA2 — General-purpose I/O port A bit 2 |
| Chân 6 | PTA3 — General-purpose I/O port A bit 3 |
| Chân 7 | VDD — Positive supply (3V to 5.5V) |
| Chân 8 | VSS — Ground reference |
| Chân 9 | PTA4/TxD — General I/O / ESCI transmit data |
| Chân 10 | PTA5/RxD — General I/O / ESCI receive data |
| Chân 11 | PTA6/SPSCK — General I/O / SPI serial clock |
| Chân 12 | PTA7/MOSI — General I/O / SPI master-out, slave-in data |
| Chân 13 | PTB0/MISO — Port B bit 0 / SPI master-in, slave-out data |
| Chân 14 | PTB1/SS — Port B bit 1 / SPI slave select |
| Chân 15 | PTB2/ADC0 — Port B bit 2 / ADC channel 0 analog input |
| Chân 16 | PTB3/ADC1 — Port B bit 3 / ADC channel 1 analog input |
| Chân 17 | PTB4/ADC2 — Port B bit 4 / ADC channel 2 analog input |
| Chân 18 | PTB5/ADC3 — Port B bit 5 / ADC channel 3 analog input |
| Chân 19 | PTB6/ADC4 — Port B bit 6 / ADC channel 4 analog input |
| Chân 20 | PTB7/ADC5 — Port B bit 7 / ADC channel 5 analog input / ICP |
Ứng dụng tiêu biểu
MC68HC908JK1CDW phù hợp cho 6 Áp dụngs: White Goods & Appliance Control, Remote Control & Keypad Electronics, Simple Sensor Acquisition Boards, Low-Cost Motor Control User Interfaces, Security Keypads and Access Panels, Small Appliance & Consumer Devices.
White Goods & Appliance Control
The MC68HC908JK1CDW is well suited for white-goods control boards such as washing machines, dishwashers, microwave ovens, and simple HVAC thermostats. Its 8 MHz CPU executes discrete-time control loops in well under one millisecond, and the integrated 6-channel ADC reads thermistor, water-level, and motor-current sensors directly without external signal conditioning. The 20-SOIC footprint sits comfortably on the appliance-grade PCB behind a 3V to 5.5V DC rail. The 1.5 KB Flash is sufficient for the single-task firmware typical of these designs - more headroom exists for diagnostic state machines. Compared to a Microchip PIC competitor, the HC08's keyboard-interrupt module adds pin-change wakeup, which is essential for low standby-power consumption in Energy Star appliances.
Được đề xuất
Remote Control & Keypad Electronics
Handheld remote controls for HVAC, garage-door openers, and security systems use the MC68HC908JK1CDW as a low-cost touch-key controller. The keyboard interrupt module provides ultra-low standby power, while the ESCI serial interface handles communication back to a central gateway. The 128B RAM is sufficient for key debouncing and transmit buffers; the 8 MHz CPU handles IR-encoding routines like RC5 or NEC within tight timing budgets. The wide-body SOIC-20 is convenient for hand-rework in design houses that assemble small batches of pre-production units. Compared to discrete RC-oscillator + encoder ASIC designs, the JK1 cuts BOM count and enables software-defined protocols that can be updated through the Flash.
Được đề xuất
Simple Sensor Acquisition Boards
Industrial sensor acquisition boards, particularly simple 4-20 mA or 0-10V interfaces, can use the MC68HC908JK1CDW as the data aggregator. The 6-channel 8-bit ADC streams up to six analog inputs through multiplexed conversion, while the SPI interface exports the result to a backplane controller. Industrial-grade -40C to +85C operation covers most factory-automation environments without derating. The internal 8 MHz bus provides deterministic ADC latency for dither signals above 1 kHz - the JK1 will miss faster transients, so applications above that rate should migrate to the JK3 or to a S08JK family. Compared to dedicated ADC-only chips, the JK1 adds program flexibility (linearization, scaling, filtering) in a single IC.
Được đề xuất
Low-Cost Motor Control User Interfaces
Small brushed-DC motor drives and stepper indexes use the MC68HC908JK1CDW to handle pushbutton input, PWM output, and current sensing. The 16-bit 2-channel Timer Interface Module (TIM) generates the PWM and captures feedback-edge timing; the 8 MHz bus supports a 1 us PWM resolution that is adequate for sub-100W motors. The 5V supply aligns with TTL-style gate drivers such as the FAN8082 or MC33030. Industrial-grade temperature rating supports under-hood or pump-housing mounting. Designers should review power dissipation - the 20-SOIC dissipates ~0.8W on the land pattern before derating; high-duty cycles may require a copper-pour heatspreader.
Được đề xuất
Security Keypads and Access Panels
The MC68HC908JK1CDW is a competent core for hard-wired security keypads and access panels. Its keyboard-interrupt module wakes the part from STOP mode on any pin change, enabling year-long battery life on a single 9V supply. The 1.5 KB Flash fits look-up tables for PIN hashing, while the 128B RAM buffers the entries during the unlock sequence. The ESCI interface feeds decoded creds to the upstream alarm-panel MCU, and the SPI can drive a peripheral such as the MM74HC595 for I/O expansion. Compared to a discrete 8051-based design, the HC08 toolchain (CodeWarrior) is well-supported and the wider temperature grade simplifies outdoor installation.
Được đề xuất
Small Appliance & Consumer Devices
From coffee machines to home air-purifiers, the MC68HC908JK1CDW is a staple of low-cost consumer appliances. Its combination of ESCI, SPI, ADC, and 16-bit timers covers nearly every sensor and actuator interface in this product class. Drop-in migration to the S08JK1 maintains the 20-SOIC footprint while doubling CPU throughput, enabling more sophisticated UI features without a PCB redesign. The wide-body SOIC handles hand-solder rework during the prototype phase; production runs typically shift to reflow for higher throughput. Compared to a PIC16F alternative, the HC08's bus-multiplexed instruction set can yield 30-40% denser object code for compact state machines.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC68HC908JK1CDW — 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 | MC68HC908JK1CP | MC68HC908JK1MDW | MC68HC908JK3CDW | MC68HC908JK8CDW | MC68HC908JL3CDW |
|---|---|---|---|---|---|---|
| Package | 20-SOIC wide-body | 20-SOIC wide-body | 20-SOIC wide-body | 20-SOIC wide-body | 20-SOIC wide-body | 20-SOIC wide-body |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Program Flash | 1.5 KB | 1.5 KB | 1.5 KB | 3 KB | 8 KB | 4 KB |
| RAM | 128 B | 128 B | 128 B | 128 B | 256 B | 128 B |
| CPU Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Supply Voltage | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V | 2.7V to 5.5V (E variant) | 3V to 5.5V | 2.7V to 5.5V |
| ADC | 8-bit, 6-ch | 8-bit, 6-ch | 8-bit, 6-ch | 8-bit, 6-ch | 8-bit, 6-ch | 8-bit, 6-ch |
| Operating Temperature | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Bảo phân biệt quan trọng
- Industrial temperature range (vsMC68HC908JK1CP)
- Memory upgrade path without PCB change (vsMC68HC908JK1CDW)
- Active-production lifecycle option (vsS08JK1CDW)
Ghi chú thiết kế
Estimated: at VDD=5V and CPU active at 8 MHz, the JK1 draws roughly 6 mA from VDD. In STOP mode consumption drops below 5 uA. A 100 nF ceramic decoupling capacitor must be placed within 5 mm of each VDD/VSS pin, and a single 10 uF bulk capacitor (tantalum or aluminum) should be placed within 25 mm of the supply entry. The 20-SOIC wide-body package has a theta-JA near 80 C/W, which is fine for the JK1's typical 30 mW dissipation but leaves no margin for high-current loads on adjacent pins.
Route the ICP (PTB7) and TCLK pins away from switching signals so the SCI/SPI tranceivers do not inject common-mode noise into the timer capture. If the ADC inputs are read at low frequency, keep their traces short and isolated from the digital I/O on PTA0-PTA7 by a guard trace tied to analog ground. The Crystal/Crystal-less mode is selectable through the configuration register; the on-chip trimming removes external resonator components in many applications.
Avoid leaving unused PTA/PTB pins floating; configure them as outputs (driving low) or enable the internal pull-ups to prevent SIO-mode oscillator pickup. The M68HC08 family is sensitive to ESD strikes when the I/O is not clamped at the board level - install TVS arrays such as PESD3V3L4UG on connectors exposed to the field. Be sure to ground the VPP/test pin (sharing with an I/O) during normal operation; otherwise, the part can enter monitor mode inadvertently.
Estimated: a 4-layer stackup with the inner layer acting as a ground plane improves ADC noise rejection by ~10 dB over a 2-layer board, at the cost of doubled assembly expense. The wide-body SOIC demands 1.27 mm pitch clearance on the land pattern - check IPC-7351 nominal footprints to avoid solder bridging on hand-reworked prototypes. Use a ground-pour hit-and-pour pattern under the chip to absorb 16-bit timer PWM-induced switching ground currents.
Thông tin tuân thủ
RoHS, REACH, lead-free, halogen-free, and conflict-minerals status were not explicitly stated in the provided Verified Web Data snippets for the MC68HC908JK1CDW and are recorded as 'unknown'. The part is not AEC-Q100 qualified (industrial part, no automotive grade option in the JK1 family).
