MC68HC908JK1ECDW - 8-Bit 8MHz MCU, 1.5KB FLASH, 20-SOIC | NXP
N.º da peça: MC68HC908JK1ECDW ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.84 | $5,84 |
| 10 | $5.27 | $52,70 |
| 100 | $4.62 | $462,00 |
| 500 | $4.05 | $2.025,00 |
| 1.000 | $3.5 | $3.500,00 |
MC68HC908JK1ECDW Visão geral
What is an HC08 microcontroller? The HC08 is a family of 8-bit microcontrollers introduced in the early 1990s by Motorola (later Freescale, now NXP Semiconductors) using the M68HC08 central processor unit core. An HC08 MCU integrates CPU, FLASH/ROM program memory, RAM, timers, an A/D converter, and flexible I/O onto a single chip using a customer-specified integrated circuit (CSIC) design strategy, placing HC08 in the broader hierarchy of 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. The MC68HC908JK1ECDW belongs to the low-cost JK1 sub-family targeting cost-sensitive applications.
Key features include 15 general-purpose I/O pins, an on-chip 12-channel 8-bit ADC, two 16-bit dual-function timer channels, a serial communications interface (SCI), and an internal oscillator with trimming capability. The device supports in-system programming and in-application programming via the ROM-resident monitor, simplifying field firmware updates without an external programmer.
The architecture centers on the enhanced M68HC08 CPU with a 16-bit stack pointer and 16-bit index register, enabling compact C-language code and efficient stack usage. The internal bus runs at one-half the oscillator frequency, and the FLASH controller supports security features including a programmable block-protect register to prevent unauthorized read-back of firmware.
Typical applications include appliance control modules, simple sensor interface boards, low-end motor-control BLDC drivers, HVAC thermostat controllers, automotive body electronics, and consumer white goods. The wide operating temperature and low cost make JK1 a popular choice for high-volume, cost-optimized designs.
A core design consideration is the trade-off between internal oscillator accuracy and external crystal cost: the trimmed internal oscillator is suitable for UART baud timing tolerance of approximately +/-2%, but precision timing applications should add an external 32.768kHz crystal or ceramic resonator to the OSC1/OSC2 pins.
This page synthesizes distributor stock data, drop-in compatible same-family alternatives, and practical design notes not aggregated on a single distributor page.
Alternativas drop-in para MC68HC908JK1ECDW — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
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Nenhuma alternativa drop-in disponível para este produto.
Solicitar alternativasMC68HC908JK1ECDW Classificações máximas e características elétricas
| Core Architecture | M68HC08 (HC08) |
| Largura do barramento de dados | 8-bit |
| Maximum CPU Clock Frequency | 8 MHz |
| Program Memory Size | 1.5 KB (1.5K x 8) FLASH |
| RAM Size | 128 x 8 (128 bytes) |
| Number of I/O Pins | 15 |
| Encapsulamento / Caixa | 20-SOIC (DW), wide body 7.50 mm |
| Tipo de montagem | Surface Mount |
| ADC Resolution | 8-bit, 12 channels (per family datasheet) |
| Timer Channels | 2 x 16-bit dual-function timer channels |
| Communication Interface | SCI (Serial Communications Interface) |
| Faixa de temperatura de operação | -40C to +85C (extended) |
| In-Circuit Programming | Monitor mode (ROM-resident) |
| Oscillator | Internal trimmed + external crystal/ceramic resonator option |
Configuração de pinos do MC68HC908JK1ECDW
| Pino 1 | RST — External reset input (active low) |
| Pino 2 | IRQ — External interrupt request |
| Pino 3 | PTA0 — Port A bit 0 / ADC channel 0 |
| Pino 4 | PTA1 — Port A bit 1 / ADC channel 1 |
| Pino 5 | PTA2 — Port A bit 2 / ADC channel 2 |
| Pino 6 | PTA3 — Port A bit 3 / ADC channel 3 |
| Pino 7 | PTA4 — Port A bit 4 / ADC channel 4 |
| Pino 8 | PTA5 — Port A bit 5 / ADC channel 5 |
| Pino 9 | PTA6 — Port A bit 6 / ADC channel 6 |
| Pino 10 | PTA7 — Port A bit 7 / ADC channel 7 |
| Pino 11 | PTB0 — Port B bit 0 / ADC channel 8 |
| Pino 12 | PTB1 — Port B bit 1 / ADC channel 9 |
| Pino 13 | PTB2 — Port B bit 2 / ADC channel 10 |
| Pino 14 | PTB3 — Port B bit 3 / ADC channel 11 |
| Pino 15 | VSS — Ground |
| Pino 16 | OSC1 — Oscillator input / external crystal |
| Pino 17 | OSC2 — Oscillator output / external crystal |
| Pino 18 | VDD — Positive supply |
| Pino 19 | PTB4 — Port B bit 4 |
| Pino 20 | PTB5 — Port B bit 5 |
Aplicações típicas
MC68HC908JK1ECDW é adequado para 7 aplicaçãos: Appliance Control Modules, HVAC Thermostat Controllers, Automotive Body Electronics, Low-Cost Sensor Interface Boards, Consumer White Goods Controllers, Industrial Sensor Modules, Battery-Operated Low-Power Devices.
Appliance Control Modules
Why MC68HC908JK1ECDW fits this application: The MC68HC908JK1ECDW's combination of 1.5KB FLASH, 128 bytes RAM, 15 GPIO, and an on-chip 8-bit ADC delivers just-enough compute headroom to drive washing-machine or dishwasher user-interface PCBs at sub-$2 BOM cost. With 8MHz CPU clock the JK1 handles keypad scan, LED multiplex, and triac-based load control loops comfortably. How it is used + performance consideration: The MCU is mounted on the appliance main control board, reading the rotary encoder on PTA, driving the seven-segment display through port multiplexing, and switching a triac via PWM on PTB. Unlike an ARM Cortex-M0, the JK1 carries only one timer pair, so designers must share it between the triac zero-crossing scheduler and the buzzer tone generator, which limits sophisticated load-management algorithms.
Recomendado
HVAC Thermostat Controllers
Why MC68HC908JK1ECDW fits this application: The 12-channel 8-bit on-chip ADC allows direct connection of multiple thermistor and humidity sensors, and the extended -40C to +85C operating range of the E-suffix supports outdoor-mounted thermostats and furnace control boards. The HC08 core is well-suited to PID-style temperature loops running at slow update rates. How it is used + performance consideration: The MCU scans the wall-mounted thermistor bridge every 250 ms, computes a proportional-integral control law, and drives a relay through PTB. Compared with a 32-bit Cortex-M0+ thermostat MCU, the JK1 lacks the RAM for advanced scheduling and touch-button sensing; designers must add the touch IC externally if capacitive buttons are required.
Recomendado
Automotive Body Electronics
Why MC68HC908JK1ECDW fits this application: The 15 GPIO of the JK1 cover seat-controller, mirror-controller, and interior-light-controller pin counts at minimal cost, and the 8MHz CPU frequency handles CAN-emulated peer-to-peer or LIN-bus message-frame timing on the SCI peripheral. The extended-industrial temperature rating is acceptable for cabin electronics though not engine-compartment modules. How it is used + performance consideration: The MCU is placed at the head of a body-electronics LIN slave, receiving switch inputs on PTA and driving LED or motor-driver outputs on PTB. Trade-off: the JK1 has no hardware CAN controller, so high-speed CAN body networks need an external MCP2515 stand-alone CAN controller, raising BOM cost relative to a CAN-equipped successor MCU.
Recomendado
Low-Cost Sensor Interface Boards
Why MC68HC908JK1ECDW fits this application: A 1.5KB FLASH budget is sufficient for fixed-function analog-to-network bridge firmware (sensor linearization, calibration lookup, packet framing), and the integrated SCI handles UART passthrough at standard 9600/19200 baud rates from the internal trimmed oscillator. How it is used + performance consideration: The JK1 is placed on a small sensor-interface PCB, reads an analog sensor through the ADC, applies a first-order correction, and outputs the result on SCI to a downstream master controller. The 128-byte RAM limits the look-up-table size to roughly 32 entries, so designers must pre-compress calibration coefficients for use cases requiring high-accuracy conversion.
Recomendado
Consumer White Goods Controllers
Why MC68HC908JK1ECDW fits this application: The combination of low unit cost (sub-$4 at 1k pieces as of 2026-10-18), small 20-SOIC footprint, and integrated 12-channel ADC plus two 16-bit timers covers the entire MCU bill-of-materials for toaster-oven, rice-cooker, and microwave user-interface boards. The 15 I/O satisfy keypad-scan plus seven-segment/LED drive requirements directly. How it is used + performance consideration: Designers configure one timer for triac zero-crossing detection and the other for the beep-tone generator, sharing the same 8MHz bus. Trade-off: the small 1.5KB FLASH means complex menu UIs must use a separate display controller IC; the JK1 cannot host both user-interface graphics and the underlying control law in one device.
Recomendado
Industrial Sensor Modules
Why MC68HC908JK1ECDW fits this application: The -40C to +85C extended-industrial operating range and the integrated 8-bit ADC deliver factory-floor compatibility for low-cost current-loop or 0-10V analog transducer interfaces. The SCI peripheral supports 4-20 mA loop emulation or RS-485 polling at baud rates up to 115200 from an external crystal. How it is used + performance consideration: The MCU is mounted on a DIN-rail transducer PCB, scaling a 4-20 mA input through the ADC and outputting a digital reading on SCI every 100 ms. The 1.5KB FLASH budget fits a basic scaling and linearization routine but cannot host TLS or cryptographic protocol stacks; secure remote-management features require an upgraded successor MCU.
Recomendado
Battery-Operated Low-Power Devices
Why MC68HC908JK1ECDW fits this application: The HC08 family features STOP and WAIT low-power modes that drop current consumption to single-digit microamps, allowing the JK1 to serve battery-powered metering or remote-sensing nodes. The internal trimmed oscillator avoids the standby current of an external crystal. How it is used + performance consideration: The MCU enters STOP mode and wakes on an IRQ-triggered switch-closure event, then samples the ADC, transmits over SCI, and re-enters STOP. Trade-off: the JK1's analog peripheral leakage in STOP is higher than that of modern low-power MCUs, so average system current for battery-life calculations should use the JK1 datasheet's STOP-mode plot, not generic HC08 family guidance.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC68HC908JK1ECDW — comparação, orientação de projeto e informações de conformidade.
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Comparação com alternativas
| Parâmetro | Este produto | MC68HC908JK1EMDW | MC68HC908JK1EVDW | MC68HC908JK3ECDW | MC68HC908JK1CDW | MC68HC705J1ACDW |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors (same) | NXP Semiconductors (same) | NXP Semiconductors (same) | NXP Semiconductors (same) | NXP Semiconductors (same) |
| Package | 20-SOIC (DW) | 20-SOIC (DW) | 20-SOIC (DW) | 20-SOIC (DW) | 20-SOIC (DW) | 20-SOIC (DW) |
| Core | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC05 (8-bit) |
| Maximum CPU Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 4 MHz |
| FLASH Memory Size | 1.5 KB | 1.5 KB | 1.5 KB | 4 KB | 1.5 KB | 1 KB OTP |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 64 bytes |
| Number of I/O | 15 | 15 | 15 | 20 (in 28-DIP option) | 15 | 14 |
| Operating Temperature | -40C to +85C (E-suffix) | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C (C-suffix) | -40C to +85C |
Principais diferenciais
- Same-package, same-FLASH drop-in with identical 8MHz core (vs MC68HC908JK1EMDW)
- Larger FLASH without package change (vs MC68HC908JK3ECDW)
- Wider operating temperature envelope than the commercial C-suffix (vs MC68HC908JK1CDW)
Notas de projeto
Place a 100nF decoupling capacitor as physically close as possible to the VDD pin (pin 18) and a bulk 10uF aluminum-polymer or tantalum capacitor adjacent to the package. The HC08 core draws sharp current edges during FLASH programming cycles that, without proper bypassing, can corrupt adjacent port-latch reads. Keep analog VDD traces separate from digital switching nodes and use a star-ground topology if the ADC channels are referenced to a low-impedance sensor.
When using an external crystal, choose a load-capacitance crystal matching the C1/C2 values recommended in the M68HC08 family oscillator section, typically 22pF for a fundamental 8MHz crystal. Add guard traces around the OSC1/OSC2 pins and route them inside a grounded keep-out to prevent noise coupling into the I/O timing. If the trimmed internal oscillator provides acceptable UART baud accuracy (typically +/-2%), the BOM savings over a discrete crystal warrants omission.
Estimated: code memory margin for the 1.5KB FLASH is roughly 1200 lines of optimized C source before reaching the linker ceiling; reserve at least 200 bytes for interrupt-vector table and monitor-mode bootloader hooks. Designers frequently underestimate FLASH usage when including floating-point libraries; consider compiling with -Os and using integer-only math. Verify the BLOCK-PROTECT register is set to lock FLASH against unauthorized read-back in any production firmware.
The 15 I/O of the JK1 are organized into two ports (PTA and PTB); switching all 15 pins simultaneously can inject ground-bounce large enough to reset internal registers. Stagger high-current pin transitions by software add a few NOP delays between register writes to ensure stable operation. ADC sample accuracy depends on minimizing simultaneous high-frequency switching on PTA7-PTA0 (which double as ADC channels 0-7); route aggressive switching loads to PTB instead.
Informações de conformidade
RoHS, REACH, lead-free and halogen-free status were not explicitly stated in the provided web-data snippets and must be verified against the current NXP product-compliance declaration (PCN/CoC) before volume procurement as of 2026-10-18. The E-suffix typically denotes lead-free NiPdAu finish on NXP legacy parts but this must be confirmed per shipment.
