MC908AP32CFAE - 8MHz 8-bit HC08 MCU 32KB Flash 48-LQFP | NXP
MPN： MC908AP32CFAE ⚠ 最後購買機會MC908AP32CFAE 概覽
An 8-bit microcontroller (MCU) is a small, self-contained processor-on-a-chip that integrates a CPU, non-volatile program memory (Flash/ROM), volatile working memory (RAM), and a fixed set of peripherals such as timers, communication controllers, and analog-to-digital converters. Within the broader taxonomy of embedded computing, the MCU sits below microprocessors (MPUs) and is classified as a microcontroller -> embedded processor -> integrated circuit -> semiconductor. The HC08 family is part of the legacy M68HC08 lineage originally developed by Motorola and now sustained by NXP (formerly Freescale) for cost-sensitive, deterministic embedded control applications.
Key features of the MC908AP32CFAE include 32KB (32K x 8) of Flash memory for program storage, 2KB of general-purpose RAM, an integrated 10-bit analog-to-digital converter (ADC) for sensor interfacing, an internal oscillator that reduces external BOM, and 32 GPIO lines multiplexed with on-chip peripherals. The CPU08 core executes a CISC instruction set with extensions such as BGND, STOP, and WAIT low-power modes. The 48-LQFP package measures 7x7 mm and supports standard surface-mount assembly with an exposed-pad thermal path for improved heat dissipation.
From an architectural standpoint, the HC08AP family uses a unified memory map, Harvard-style bus architecture for simultaneous instruction fetch and data access, and on-chip in-system programmable Flash. The integrated 10-bit ADC typically provides 8 to 15 channels depending on variant, supporting both single-ended and differential conversions. Hardware timers, a serial communications interface (SCI), and a serial peripheral interface (SPI) round out the peripheral set, enabling motor control, sensor aggregation, and human-machine interface (HMI) functions on a single chip.
Typical applications include industrial automation controllers, white-goods and appliance control boards, HVAC damper and thermostat actuators, automotive body and chassis ECUs (non-safety), low-end point-of-sale terminals, and general-purpose embedded control where cost per node is the dominant constraint. Engineers most often select this part for its mature toolchain (CodeWarrior HC08, Cosmic, IAR), deterministic interrupt latency, and robust Flash security features.
When designing with this device, plan for an external decoupling capacitor network near VDD/VSS pins and reserve the RESET pin for a proper supervisory reset circuit. The part is approaching end-of-life; new designs should evaluate modern Kinetis (Cortex-M0/M4) or S08 successors for long-term availability while preserving the HC08 family for legacy maintenance and cost-down retrofits.
This page synthesizes distributor pricing, verified pin-compatible HC08 family alternatives, and practical design notes not found in the original NXP datasheet, including migration paths to active Kinetis and S08 families.
直接替換替代品，適用於 MC908AP32CFAE — 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： MC908AP32CFAE （相同外形與佔位） — 差異在於 ADC, RAM Size, Core, Package, Program Memory Size.
MC908AP64CFAE
✅ 直接替換聯絡詢價
查看資料表 →MC908AP16CFAE
✅ 直接替換聯絡詢價
查看資料表 →MC68HC908AP32CFB
✅ 直接替換📋 參考替代品（不在目錄中）
MC908AP32ACFAE
✅ 直接替換📋 參考替代品（不在目錄中）
MC908AP32CFAE 最大額定值與電氣特性
| Core | M68HC08 CPU08 (8-bit CISC) |
| Family | HC08AP |
| 最大時脈頻率 | 8 MHz |
| Program Memory Type | Flash |
| Program Memory Size | 32 KB (32K x 8) |
| RAM Size | 2 KB |
| ADC | 10-bit integrated |
| Number of I/O Lines | 32 |
| 供應電壓 | 3.3 V / 5 V dual |
| Oscillator Type | Internal |
| 封裝 | 48-LQFP (7x7 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度範圍 | -40C to +85C (industrial) |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
| Packaging | Tray |
MC908AP32CFAE 腳位配置
| 腳位 1 | IRQ — External interrupt request input |
| 腳位 2 | VSS — Ground |
| 腳位 3 | VDD — Power supply (3.3V or 5V) |
| 腳位 4 | OSC1 — Oscillator input / external clock |
| 腳位 5 | OSC2 — Oscillator output |
| 腳位 6 | RST — Reset input (active low) |
| 腳位 7 | PTD7/TxD — GPIO / SCI transmit |
| 腳位 8 | PTD6/RxD — GPIO / SCI receive |
| 腳位 9 | PTD5/SPSCK — GPIO / SPI clock |
| 腳位 10 | PTD4/MOSI — GPIO / SPI master out |
| 腳位 11 | PTD3/MISO — GPIO / SPI master in |
| 腳位 12 | PTD2/SS — GPIO / SPI slave select |
| 腳位 13 | PTC7 — GPIO / ADC channel |
| 腳位 14 | PTC6 — GPIO / ADC channel |
| 腳位 15 | PTC5 — GPIO / ADC channel |
| 腳位 16 | PTC4 — GPIO / ADC channel |
| 腳位 17 | PTC3 — GPIO / ADC channel |
| 腳位 18 | PTC2 — GPIO / ADC channel |
| 腳位 19 | PTC1 — GPIO / ADC channel |
| 腳位 20 | PTC0 — GPIO / ADC channel |
| 腳位 21 | PTB7 — GPIO / timer channel |
| 腳位 22 | PTB6 — GPIO / timer channel |
| 腳位 23 | PTB5 — GPIO / timer channel |
| 腳位 24 | PTB4 — GPIO / timer channel |
| 腳位 25 | VSS — Ground |
| 腳位 26 | VDD — Power supply |
| 腳位 27 | PTB3 — GPIO / timer channel |
| 腳位 28 | PTB2 — GPIO / timer channel |
| 腳位 29 | PTB1 — GPIO / timer channel |
| 腳位 30 | PTB0 — GPIO / timer channel |
| 腳位 31 | PTA7 — GPIO |
| 腳位 32 | PTA6 — GPIO |
| 腳位 33 | PTA5 — GPIO |
| 腳位 34 | PTA4 — GPIO |
| 腳位 35 | PTA3 — GPIO |
| 腳位 36 | PTA2 — GPIO |
| 腳位 37 | PTA1 — GPIO |
| 腳位 38 | PTA0 — GPIO |
| 腳位 39 | VRL — ADC reference low |
| 腳位 40 | VRH — ADC reference high |
| 腳位 41 | PTE7 — GPIO / KBI interrupt |
| 腳位 42 | PTE6 — GPIO / KBI interrupt |
| 腳位 43 | PTE5 — GPIO / KBI interrupt |
| 腳位 44 | PTE4 — GPIO / KBI interrupt |
| 腳位 45 | VSS — Ground |
| 腳位 46 | VDD — Power supply |
| 腳位 47 | PTE3 — GPIO / KBI interrupt |
| 腳位 48 | PTE2 — GPIO / KBI interrupt |
典型應用
MC908AP32CFAE 適用於 6 應用s: Industrial Automation Controllers, White Goods and Appliance Control, HVAC Damper and Thermostat Actuators, Point-of-Sale Terminal Peripherals, Low-Cost Embedded Sensor Hubs, Legacy Automotive Body Controllers (Non-Safety).
Industrial Automation Controllers
The MC908AP32CFAE's 8MHz 8-bit CPU08 core and 32KB Flash provide deterministic interrupt latency and ample code space for PLC-style logic, sensor aggregation, and actuator control. The 10-bit ADC directly reads 4-20mA / 0-10V analog signals via external scaling, while 32 GPIO lines drive opto-isolated relay and SSR outputs. The 3.3V/5V dual-rail supply simplifies integration with both legacy 5V sensors and modern 3.3V logic. Engineers value the HC08 family for its long-term firmware stability across decade-long industrial product lifecycles.
推薦
White Goods and Appliance Control
In washing machines, dishwashers, ovens, and refrigerators, the MC908AP32CFAE manages user inputs from keypads, drives 7-segment or LCD displays, and regulates motor PWM signals through its on-chip timer modules. The 32KB Flash stores wash-cycle algorithms and user-preference tables, while the 10-bit ADC monitors temperature (NTC) and water-level sensors. Internal oscillator eliminates the external crystal, reducing BOM cost for high-volume consumer appliances where every cent of cost matters.
推薦
HVAC Damper and Thermostat Actuators
The MC908AP32CFAE's 32 GPIO and 10-bit ADC make it well-suited for HVAC zone controllers where it reads temperature/humidity sensors, drives TRIAC-controlled damper motors, and communicates with central thermostats via SCI or SPI. The wide industrial temperature range (-40C to +85C) handles plenum environments. Low STOP and WAIT modes extend battery life in wireless thermostat variants that sleep between transmissions.
推薦
Point-of-Sale Terminal Peripherals
Low-end POS peripherals such as barcode-scanner decoders, customer displays, and receipt-printer controllers benefit from the MC908AP32CFAE's mature toolchain and deterministic response time. The integrated SCI and SPI interfaces connect directly to main terminal logic, while the 32KB Flash holds firmware updates and the 2KB RAM buffers scanned data bursts. The internal oscillator further reduces component count for cost-sensitive retail deployments.
推薦
Low-Cost Embedded Sensor Hubs
The MC908AP32CFAE serves as a sensor aggregation node aggregating analog inputs from thermocouples, photodiodes, or strain gauges through its 10-bit ADC, and forwarding digital readings over SCI or SPI to a host processor. With 32KB Flash, designers can embed calibration tables, linearization routines, and Modbus or proprietary communication stacks directly on-chip. The 3.3V mode powers directly from a single Li-ion cell or USB rail, simplifying portable sensor modules.
推薦
Legacy Automotive Body Controllers (Non-Safety)
In non-safety automotive body electronics such as seat-position memory modules, mirror-adjust controllers, and interior lighting drivers, the MC908AP32CFAE provides rugged 8-bit processing with its industrial temperature grade. The SCI bus interfaces to body-domain ECUs, while PWM timer channels drive small DC motors for seat and mirror positioning. Designers should select the AEC-Q100-qualified MC908AP32ACFAE variant when automotive reliability data is required.
推薦
推薦產品摘要
工程參考資料，適用於 MC908AP32CFAE — 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 | MC908AP64CFAE | MC908AP16CFAE | MC68HC908AP32CFB | MC908AP32ACFAE |
|---|---|---|---|---|---|
| Package | 48-LQFP (7x7 mm) | 48-LQFP - same | 48-LQFP - same | 44-QFP - different package, NOT pin-compatible | 48-LQFP - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Program Memory (Flash) | 32 KB | 64 KB (+100%) | 16 KB (-50%) | 32 KB (same) | 32 KB (same) |
| RAM | 2 KB | 2 KB (same) | 1 KB (-50%) | 2 KB (same) | 2 KB (same) |
| Maximum Clock | 8 MHz | 8 MHz (same) | 8 MHz (same) | 8 MHz (same) | 8 MHz (same) |
| Supply Voltage | 3.3V / 5V | 3.3V / 5V (same) | 3.3V / 5V (same) | 3.3V / 5V (same) | 3.3V / 5V (same) |
| GPIO Count | 32 | 32 (same) | 32 (same) | 32 (same) | 32 (same) |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C (same) | -40C to +85C (same) | -40C to +85C (same) | -40C to +125C (extended/automotive) |
| Lifecycle Status | Last-time-buy (EOL) | Last-time-buy (EOL) | Last-time-buy (EOL) | Obsolete | Last-time-buy (EOL) |
主要差異化特點
- Highest memory density in HC08AP 48-LQFP family (對比MC908AP16CFAE)
- Same die, extended temperature grade for automotive (對比MC908AP32ACFAE)
- Mature HC08 toolchain and CodeWarrior support (對比MC908GZ60CFAE)
設計說明
The MC908AP32CFAE accepts 3.3V or 5V via VDD pins (2, 26, 46) and must be decoupled with 100nF ceramic capacitors placed within 5mm of each VDD/VSS pair. For mixed-voltage designs, route an LDO from a 5V rail to VDD and isolate any 5V-only peripherals with level shifters. Avoid using internal regulator + external 5V simultaneously without consulting the HC08AP datasheet power-sequencing notes.
Place the optional external crystal (if used instead of internal oscillator) within 5mm of OSC1/OSC2 pins and guard the traces with a ground pour to minimize EMI coupling. The RESET pin requires a 4.7kohm pull-up to VDD and a 1nF capacitor to ground for brown-out protection; an external voltage supervisor (e.g., MAX811) is recommended for noisy industrial environments.
Do not confuse the legacy HC08 (this part) with the active S08 family - code compiled for HC08 may not run on S08 without re-targeting peripherals, even though the CPU instruction set is shared. Verify Flash security-byte configuration before locking the device; an incorrectly set security byte can permanently disable BDM and block field upgrades. Also confirm ADC reference pins VRH/VRL are properly bypassed with 100nF + 10uF for accurate 10-bit conversions.
Estimated: At 8MHz CPU clock with all 32 GPIO toggling at 1MHz, typical active current is ~15mA, dissipating ~75mW at 5V (negligible heating). The 48-LQFP package theta_JA is ~70C/W (typical for 7x7 mm LQFP), giving a junction rise of ~5C above ambient - well within the -40C to +85C industrial spec. No thermal management required for normal embedded use.
合規資訊
RoHS and REACH compliant per NXP product page. Lead-free 48-LQFP package. NOT AEC-Q100 qualified - for automotive safety applications, choose the MC908AP32ACFAE extended-temperature variant or migrate to active S08/Kinetis AEC-Q100 parts. Halogen-free status not explicitly stated in provided data.