MC68HC908MR32CFU - 8MHz 8-bit MCU 32KB Flash 64-QFP | NXP
Référence : MC68HC908MR32CFU ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $18.42 | $18,42 |
| 10 | $16.1 | $161,00 |
| 100 | $12.85 | $1 285,00 |
| 500 | $10.95 | $5 475,00 |
| 1 000 | $9.4 | $9 400,00 |
MC68HC908MR32CFU Présentation
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, peripherals, and I/O into one package, designed for embedded control tasks. The MC68HC908MR32CFU sits within the broader M68HC08 family taxonomy: MCU -> 8-bit microcontroller -> HC08 family -> motor-control sub-family -> MR32 series. The architecture uses a customer-specified integrated circuit (CSIC) design strategy, allowing NXP/Freescale to mix memory sizes, peripherals, and I/O counts on a common core.
Key features include built-in PWM channels optimised for three-phase motor control, an analog-to-digital converter for current/voltage sensing, and a programmable timer interface (TIM). The FLASH memory supports in-circuit programming and security-lock features for code protection. The 64-QFP package provides ample I/O for power-stage interfacing while maintaining a manageable PCB footprint.
Typical applications include low-end brushless DC (BLDC) and permanent-magnet synchronous motor (PMSM) control, appliance motor drives such as washing machines and refrigerators, HVAC fan control, and industrial variable-frequency drives (VFDs). The PWM and ADC peripherals are hardware-tuned for current-loop control loops. When designing with this MCU, ensure that the 8 MHz internal clock is matched to your application's control-loop bandwidth, and budget for the FLASH/erase endurance if in-system firmware updates are planned.
Alternatives de remplacement direct pour MC68HC908MR32CFU — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MC68HC908MR32CFU (même facteur de forme et même empreinte) — différant par RAM Size, Peripherals, Program Memory Size, ADC, Number of I/O Pins.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MC908MR32CFUE
✅ Remplacement direct✓ En stock
$7.15 / unité
Voir la fiche technique →MC68HC908MR32CFUE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MC68HC908MR16CFU
✅ Remplacement direct✓ En stock
$4.45 / unité
Voir la fiche technique →MC68HC908MR32VFU
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MC68HC908MR32CFU Valeurs maximales et caractéristiques électriques
| Core | HC08 (CPU08) |
| Core Size | 8-bit |
| Max Internal Bus Frequency | 8.2 MHz |
| Program Memory Size | 32 KB (32K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 768 bytes |
| Number of I/O Pins | 44 |
| Connectivity | SCI, SPI |
| Peripherals | LVD, POR, PWM |
| ADC | 10-bit, up to 10 channels |
| Boîtier | 64-QFP (14x14 mm) |
| Type de montage | Surface Mount |
| RoHS | compliant (per DigiKey listing) |
Guide de configuration des broches du MC68HC908MR32CFU 64-qfp (14x14 mm)
Configuration des broches du MC68HC908MR32CFU (boîtier 64-qfp (14x14 mm)). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour MC68HC908MR32CFU.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MC68HC908MR32CFU convient pour 6 applications: Brushless DC (BLDC) Motor Control, Permanent Magnet Synchronous Motor (PMSM) Drives, Home Appliance Motor Drives, Industrial Variable-Frequency Drives (VFDs) - Low Power, Remote Keyless Entry (RKE) and Low-Power Wireless Nodes, Educational and Legacy Motor-Control Development Boards.
Brushless DC (BLDC) Motor Control
The MC68HC908MR32CFU is purpose-built for three-phase BLDC motor control. Its on-chip PWM module and 10-bit ADC up to 10 channels are sized for trapezoidal commutation plus current sensing, while 8.2 MHz internal bus and 32 KB FLASH fit typical sensorless BLDC firmware without external memory. The SCI/SPI block talks to host controllers or isolated gate drivers, and 44 GPIO pins drive three half-bridges plus encoder/commutation inputs. Against an ARM Cortex-M0, the HC08 offers simpler toolchain startup but lower MIPS.
Recommandé
Permanent Magnet Synchronous Motor (PMSM) Drives
For low-end PMSM scalar or vector control, the MC68HC908MR32CFU integrates PWM, ADC, and a programmable TIM block capable of centre-aligned PWM generation. The 32 KB FLASH accommodates Park/Clarke transforms and PI current loops for sensorless FOC, while the 768-byte RAM handles per-cycle variables. The 64-QFP package is large enough to expose all motor-control pins without multiplexing, simplifying PCB layout in appliance-class VFD designs.
Recommandé
Home Appliance Motor Drives
Washing machines, refrigerators, dishwashers, and HVAC fans are classic applications for the HC908MR32 family. The MCU's wide operating temperature (per NXP rating) and on-chip LVD/POR protection cope with mains-rail noise and brownouts common in white goods. The 8 MHz bus is fast enough for 50/60 Hz mains-synchronous commutation, and 44 I/O pins handle triac/relay drivers plus user-interface keypads without external I/O expanders in cost-sensitive appliance designs.
Recommandé
Industrial Variable-Frequency Drives (VFDs) - Low Power
Sub-1 kW industrial VFDs and pump/fan controllers leverage the HC908MR32's motor-control optimised peripherals. The 10-bit ADC samples shunt-resistor current at PWM edges, while the on-chip PWM drives a 3-phase inverter via gate drivers. SCI provides an RS-485 interface to a PLC or HMI; SPI talks to isolated gate drivers or digital potentiometers. The 64-QFP footprint allows through-hole-or-SMT PCB integration with adequate creepage for 230 V mains designs.
Recommandé
Remote Keyless Entry (RKE) and Low-Power Wireless Nodes
Although the HC908MR32CFU is primarily positioned for motor control, its low-power HC08 core and small FLASH footprint also fit RKE transmitter designs. The 32 KB FLASH stores encoder/rolling-code logic, SCI/SPI talks to UHF transmitters and EEPROM key storage. For new designs, however, dedicated low-power parts such as the NXP KW series or Microchip PIC16F are more efficient; the MR32CFU is only recommended where motor-driver and RF baseband are colocated on the same PCB.
Recommandé
Educational and Legacy Motor-Control Development Boards
The NXP MC68HC908MR32 Control Board (kit ECCTR908MR32UM) ships with the MR32CFU and is widely used in motor-control teaching. Students and engineers learn PWM generation, commutation timing, and ADC-triggered sampling on this platform. The 64-QFP package and exposed SCI/SPI headers make oscilloscope probing and code debugging straightforward. For production graduates, the knowledge transfers directly to the modern NXP S08 and DSC families.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68HC908MR32CFU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MC908MR32CFUE | MC68HC908MR32CFUE | MC68HC908MR16CFU | MC68HC908MR32VFU |
|---|---|---|---|---|---|
| Package | 64-QFP (14x14 mm) | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same | 64-QFP (14x14 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Core / Speed | HC08, 8.2 MHz | HC08, 8.2 MHz | HC08, 8.2 MHz | HC08, 8.2 MHz | HC08, 8.2 MHz |
| FLASH Size | 32 KB | 32 KB | 32 KB | 16 KB (-50%) | 32 KB |
| RAM Size | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 768 bytes |
| Number of I/O | 44 | 44 | 44 | 44 | 44 |
| Connectivity | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI |
| Peripherals | LVD, POR, PWM, 10-bit ADC | LVD, POR, PWM, 10-bit ADC | LVD, POR, PWM, 10-bit ADC | LVD, POR, PWM, 10-bit ADC | LVD, POR, PWM, 10-bit ADC |
| Param Match | 100% (this part) | 100% drop-in | 100% drop-in | 80% (FLASH differs) | 95% drop-in |
Principaux différenciateurs
- Larger FLASH for full sensorless FOC firmware (vs MC68HC908MR16CFU)
- Pin-compatible with multiple mask-set revisions (vs MC908MR32CFUE)
- Motor-control optimised peripherals (vs Generic HC908JL3 (28-DIP))
Notes de conception
Estimated: at 5 V VDD and 8.2 MHz CPU, the HC08 core draws approximately 15-25 mA active plus peripheral contributions. Provide a 100 nF ceramic decoupling capacitor as close as possible to every VDD/VSS pair on the 64-QFP, plus a bulk 4.7 uF tantalum or aluminium on the main rail. Use NXP's recommended bypass topology from the MC68HC908MR32 datasheet (Figure 1-4) - high-frequency ceramic plus optional bulk capacitor - to suppress switching-noise-induced ADC errors.
Estimated: the 64-QFP package has a theta_JA of roughly 60-70 C/W on a 2-layer FR4 PCB. For PWM-driven motor control where the CPU is active most of the time, expect junction temperature rise of 20-30 C above ambient at full activity - well within the commercial operating range but watch that industrial-grade variants (MR32CFUE) stay within rated limits when fitted in enclosed appliance housings with limited airflow.
Route the oscillator (OSC1/OSC2) traces as short as possible and guard them with a ground ring to minimise noise coupling into the PLL/internal-bus. Keep ADC input traces away from PWM switching traces; route shunt-resistor sense lines as a kelvin pair directly to the MCU's PGA/ADC inputs to preserve current-loop accuracy. Place a 100 nF cap on each VDD/VSS pair as close as physically possible per NXP AN2203 PCB-layout guidance for HC08 motor-control parts.
Do not confuse the FLASH security-lock byte with the option-byte config: locked FLASH cannot be read out, so back up firmware before locking. Verify that your compiler/linker emit the correct S-record or Intel-HEX format compatible with the P&E BDM tool before deploying firmware. The '68' prefix versus '908' suffix denotes the original Motorola mask revision; firmware generally works on both, but check the silicon errata for any module you actually exercise.
Informations de conformité
RoHS compliance per DigiKey product listing (rank 90). Reach, halogen-free, and conflict-mineral statements not present in scraped data - set to 'unknown' rather than fabricate.