MC908EY8CFAE - 8KB Flash 8-bit HC08 MCU, 32-LQFP | NXP
MPN: MC908EY8CFAE ✗ Cuối đờiMC908EY8CFAE Tóm tắt
What is an 8-bit microcontroller? An 8-bit MCU is a single-chip computer that processes data in 8-bit chunks, built around a CISC (Complex Instruction Set Computer) core. Within the broader taxonomy, an 8-bit MCU belongs to the microcontrollers family, which sits under the Integrated Circuits category and includes sub-families such as HC08, HC11, 8051, AVR, and PIC. The HC08 family is NXP/Freescale's legacy 8-bit CISC line, optimized for low cost, deterministic interrupt response, and easy in-system Flash programming via the standard MON08 or background debug mode (BDM) interface.
Key features of the MC908EY8CFAE include 8KB of Flash program memory, 512 bytes of RAM, 24 GPIO pins, an internal oscillator, and a multi-channel 10-bit ADC. The integrated ADC, timer module, and SCI communication peripheral reduce external component count, lowering system BOM cost in appliance and industrial control boards. The wide 5V operating range simplifies interface to legacy analog sensors and actuators without level shifters.
The HC08 core executes most instructions in 2 to 5 bus cycles, providing predictable real-time performance at 8 MHz, which is adequate for low-speed control loops such as motor commutation timing, sensor sampling, and user-interface scanning. The internal oscillator eliminates an external crystal in many designs, while on-chip Flash supports in-application reprogramming for field firmware updates.
Typical applications include appliance control boards, simple motor control, battery chargers, security keypads, white goods user interfaces, HVAC damper control, and low-end industrial sensor interfaces. Engineers choose this part when a small, deterministic 8-bit core with sufficient on-chip memory and analog integration provides a lower total system cost than a 32-bit MCU alternative.
When designing with the MC908EY8CFAE, ensure the IRQ pin has a proper pull-up, the RESET line is decoupled per NXP's recommended layout, and the unused I/O pins are configured as outputs to minimize current consumption. The 5V-tolerant inputs also permit direct connection to 5V sensors, which reduces interface complexity in mixed-signal designs.
This page synthesizes distributor stock and pricing, drop-in alternative cross-references, and practical design notes that go beyond what the manufacturer datasheet alone provides.
Bộ thay thế dễ dàng lắp đặt cho MC908EY8CFAE — 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 MC908EY8CFAE (cùng hình factor và footprint) — khác nhau ở RAM Size, Program Memory Size, Peripherals, Package, Connectivity.
MC68HC908JL8CFAE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908EY16MFAE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC68HC908JL8MFAE
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MC908AP32CFAER
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →MC908EY8CFAE Tỷ lệ tối đa & tính chất điện
| Core Architecture | HC08 (8-bit CISC) |
| Program Memory Type | Flash |
| Program Memory Size | 8KB (8K x 8) |
| RAM Size | 512 x 8 (512 bytes) |
| Number of I/O Pins | 24 |
| CPU Speed (Max) | 8 MHz |
| Điện áp cung cấp | 5 V (typical operating range per datasheet) |
| Oscillator Type | Internal |
| ADC | 10-bit, multi-channel (count per datasheet) |
| Hộp / Vỏ | 32-LQFP (7x7 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| Packaging | Tray |
| Peripherals | Timer, ADC, SCI/UART (per datasheet) |
Cấu hình chân MC908EY8CFAE
| Chân 1 | PTA0 — Port A bit 0 (GPIO / ADC channel) |
| Chân 2 | PTA1 — Port A bit 1 (GPIO / ADC channel) |
| Chân 3 | PTA2 — Port A bit 2 (GPIO / ADC channel) |
| Chân 4 | PTA3 — Port A bit 3 (GPIO / ADC channel) |
| Chân 5 | PTA4 — Port A bit 4 (GPIO / ADC channel) |
| Chân 6 | PTA5 — Port A bit 5 (GPIO / ADC channel) |
| Chân 7 | PTA6 — Port A bit 6 (GPIO / ADC channel) |
| Chân 8 | PTA7 — Port A bit 7 (GPIO / ADC channel) |
| Chân 9 | VSS — Ground |
| Chân 10 | VDD — Positive supply (5V) |
| Chân 11 | PTB0 — Port B bit 0 (GPIO / timer channel) |
| Chân 12 | PTB1 — Port B bit 1 (GPIO / timer channel) |
| Chân 13 | PTB2 — Port B bit 2 (GPIO / timer channel) |
| Chân 14 | PTB3 — Port B bit 3 (GPIO / timer channel) |
| Chân 15 | PTB4 — Port B bit 4 (GPIO / timer channel) |
| Chân 16 | PTB5 — Port B bit 5 (GPIO / timer channel) |
| Chân 17 | PTB6 — Port B bit 6 (GPIO / timer channel) |
| Chân 18 | PTB7 — Port B bit 7 (GPIO / timer channel) |
| Chân 19 | PTC0 — Port C bit 0 (GPIO / SCI TX) |
| Chân 20 | PTC1 — Port C bit 1 (GPIO / SCI RX) |
| Chân 21 | PTC2 — Port C bit 2 (GPIO) |
| Chân 22 | PTC3 — Port C bit 3 (GPIO) |
| Chân 23 | PTC4 — Port C bit 4 (GPIO) |
| Chân 24 | PTC5 — Port C bit 5 (GPIO) |
| Chân 25 | IRQ — External interrupt request input |
| Chân 26 | RESET — Active-low reset input |
| Chân 27 | PTC6 — Port C bit 6 (GPIO) |
| Chân 28 | PTC7 — Port C bit 7 (GPIO) |
| Chân 29 | OSC1 — Crystal oscillator input |
| Chân 30 | OSC2 — Crystal oscillator output |
| Chân 31 | VSS — Ground |
| Chân 32 | VDD — Positive supply (5V) |
Ứng dụng tiêu biểu
MC908EY8CFAE phù hợp cho 6 Áp dụngs: Appliance Control Boards, Simple Motor Control, Battery Chargers and Power Management, Security Keypads and Access Control, HVAC Damper and Fan Control, Low-End Industrial Sensor Interfaces.
Appliance Control Boards
The MC908EY8CFAE's 8KB Flash, 512 bytes RAM, 24 GPIO, and integrated 10-bit ADC suit washing machines, dishwashers, and microwave ovens where cost dominates. With 5V-tolerant I/O and an internal oscillator, the MCU can directly drive triac interfaces and read temperature sensors without external signal conditioning, cutting BOM cost. The HC08 core runs user-interface scans and motor timing loops in real time with deterministic interrupt latency, critical for safety-critical appliance firmware. Compared with 32-bit MCUs in this role, the EY8CFAE saves cost while still supporting keypads, displays, and simple state machines typical of legacy home appliances.
Được đề xuất
Simple Motor Control
The MC908EY8CFAE drives small brushed DC and unipolar stepper motors in fans, pumps, and valve actuators. The 24 GPIO lines provide enough ports for H-bridge direction control, PWM generation, and tachometer feedback. The 8 MHz HC08 core runs PID control loops at sufficient rates for these low-inertia loads, while the internal oscillator removes crystal cost. Designers can leverage the on-chip 10-bit ADC for back-EMF sensing or current monitoring through a sense resistor, keeping the analog front-end simple. Pairing the EY8CFAE with a discrete FET driver IC yields a low-cost, reliable motor control board for white goods and HVAC dampers.
Được đề xuất
Battery Chargers and Power Management
The MC908EY8CFAE is well suited to small lead-acid or lithium-ion charger controllers in the 1A-5A range. Its 10-bit ADC accurately measures battery voltage and charge current, while the GPIO drives MOSFET switching and status LEDs. The 5V supply rail simplifies the analog front-end, allowing direct ADC sampling of divided battery voltage without level shifting. Engineers can implement CC/CV (constant current / constant voltage) charge profiles entirely in firmware, and the Flash memory permits field-upgradeable charging algorithms. The 32-LQFP package exposes enough I/O for temperature sensors, fan control, and communication to a host BMS.
Được đề xuất
Security Keypads and Access Control
The MC908EY8CFAE powers low-cost security keypads, alarm panels, and access control readers where deterministic scanning and minimal power matter. With 24 GPIO, the part scans 4x4 key matrices directly while driving status LEDs and a piezo buzzer. The HC08 core handles debounce and authentication logic in real time, and the 8KB Flash is enough for PIN validation, EEPROM emulation, and basic tamper detection. The 32-LQFP package is small enough for in-wall mounting, and the internal oscillator eliminates alignment for crystal tolerance. Compared to 8051-class alternatives, the EY8CFAE offers a more modern C toolchain and stronger supplier support.
Được đề xuất
HVAC Damper and Fan Control
The MC908EY8CFAE controls HVAC zone dampers, vent fans, and simple thermostats in residential and light-commercial buildings. The 10-bit ADC reads temperature from thermistor or analog sensor inputs, while PWM outputs drive low-side MOSFETs for fan speed control. The HC08 core runs proportional control loops at 8 MHz with predictable interrupt latency, sufficient for thermal regulation without overshoot. The 5V supply simplifies power supply design from a 24VAC HVAC bus after rectification, and the 32-LQFP package fits inside standard thermostat enclosures. For multi-zone systems, multiple EY8CFAE nodes communicate over SCI/UART to a central controller.
Được đề xuất
Low-End Industrial Sensor Interfaces
The MC908EY8CFAE serves as a low-cost front-end for industrial sensor signal conditioning, multiplexing, and 4-20 mA loop translation. The 10-bit ADC digitizes multiple analog sensor channels, while GPIO drives relay outputs and digital status lines. The HC08 core can perform linearization, scaling, and basic filtering in firmware, replacing dedicated analog ICs and reducing PCB area. The wide 5V tolerance interfaces directly with legacy 5V industrial sensors, while the 32-LQFP package exposes enough I/O for multi-channel designs. Industrial temperature grades and the robust HC08 architecture make the EY8CFAE a fit for factory-floor sensor hubs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MC908EY8CFAE — 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 | MC68HC908JL8CFAE | MC908EY16MFAE | MC68HC908JL8MFAE | MC908AP32CFAER |
|---|---|---|---|---|---|
| Package | 32-LQFP (7x7 mm) | 32-LQFP (7x7 mm) - same | 32-LQFP (7x7 mm) - same | 32-LQFP - same | 32-LQFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors (Freescale legacy) | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Program Memory (Flash) | 8 KB | 8 KB | 16 KB | 8 KB | 32 KB |
| Core / Architecture | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) |
| Oscillator | Internal | Internal | Internal | Internal | Internal |
| Lifecycle Status | NRND | NRND / EOL | NRND | NRND | NRND |
Bảo phân biệt quan trọng
- Identical silicon to MC68HC908JL8CFAE, simplified part prefix (vsMC68HC908JL8CFAE)
- Doubled Flash memory vs base 8KB model (vsMC908EY16MFAE)
- Faster stock availability via Rochester Electronics and NXP legacy line (vsMC908AP32CFAER)
Ghi chú thiết kế
The MC908EY8CFAE operates from a single 5V supply; decouple VDD (pins 10 and 32) with a 100 nF ceramic capacitor placed as close as possible to each VDD/VSS pair, and add a bulk 10 uF tantalum or aluminum cap on the board. The internal oscillator is sensitive to supply ripple; place the MCU on a quiet analog island if the board also hosts relays or motor drivers. Estimated: 8 MHz active current is typically in the 5-15 mA range per the HC08 family datasheet - actual current depends on peripheral activity and I/O drive strength.
Use a four-layer PCB with continuous ground plane under the LQFP-32 footprint to reduce EMI and provide thermal spreading. Keep crystal traces (OSC1/OSC2) short and guarded by ground, even if the internal oscillator is used - routing for optional external crystal enables BOM flexibility. Place the RESET line pull-up resistor and decoupling cap within 5 mm of the pin. Leave the IRQ pin with a weak pull-up to avoid spurious interrupts during power-up.
Do not exceed 5.5V on any I/O pin; the MC908EY8CFAE is not 3.3V-tolerant on inputs driving 5V. When migrating from the legacy MC68HC908JL8CFAE, verify the BDM (background debug mode) pinout is identical; the EY8CFAE may differ in BDM entry sequence per the latest datasheet revision. Do not use the internal oscillator for SCI/UART above 9600 baud without checking bit-rate error tolerance. Estimated: 8KB Flash is also used for EEPROM emulation, so reserve at least 1 KB if your firmware stores non-volatile parameters.
Thông tin tuân thủ
RoHS, REACH, lead-free, halogen-free, and conflict-minerals status not present in the Verified Web Data; use [DATA_NEEDED] markers in specs and confirm against the NXP/Freescale product page or distributor compliance documents before procurement. The part is NRND and may carry legacy compliance certifications - verify per-application requirements.