MC68HC908MR32CB - 32KB Flash 8-Bit MCU | NXP 56-SDIP Motor Control
MPN: MC68HC908MR32CB ✗ اختتامِ زندگیMC68HC908MR32CB جائزہ
An 8-bit MCU such as the MC68HC908MR32CB is a single-chip computer that integrates CPU, RAM, non-volatile program memory, and peripheral I/O on one die. The 68HC08 line is part of the broader 8-bit microcontroller family used in cost-sensitive, deterministic real-time applications. Within the electronics taxonomy it sits under: MCU -> microcontroller unit -> embedded processor -> semiconductor. Competing architectures include the Microchip PIC16/PIC18 and the Atmel/Microchip AVR families, but the HC08 offers an in-application programmable Flash and a stable instruction set favored in industrial motor drive designs.
Key features include 32KB (32K x 8) Flash for user code, 768 bytes of on-chip SRAM for variables and stack, an internal oscillator that eliminates the need for an external crystal in many designs, and dedicated PWM outputs suitable for three-phase brushless DC motor commutation. The HC08 CISC instruction set simplifies code generation while maintaining deterministic cycle counts. The 56-SDIP through-hole package offers robust mechanical and thermal characteristics for industrial control hardware.
The architecture combines a 68HC08 CPU core with on-chip debug support, low-voltage detect, and multiple timer interfaces. The Flash array supports in-application reprogramming, enabling firmware upgrades in the field without removing the MCU from the board. The 768-byte RAM accommodates modest data buffers and stack frames typical of motor-control state machines.
Typical applications include single-phase and three-phase AC induction motor control, brushless DC (BLDC) and switched-reluctance drives, washing-machine and refrigerator compressor drivers, low-end variable-frequency drives, and industrial fans/pumps. The PWM architecture and 8 MHz throughput are tuned for direct control of small appliances.
When designing with this part, ensure decoupling capacitors are placed close to the VDD/VSS pins per the bypass guidance in the datasheet. Use high-frequency-response ceramics on power pins to suppress transient currents during PWM edge transitions, which would otherwise couple noise into adjacent analog rails.
This page synthesizes distributor stock data, pin-compatible substitutes, and practical design notes not compiled in the manufacturer's datasheet.
کے لیے ڈراپ اِن متبادل MC68HC908MR32CB — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں MC68HC908MR32CB (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Core, RAM Size, Program Memory Size, Manufacturer, Number of I/O.
MC68HC908MR16CB
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MC908MR32VBE
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MC908MR32CBE
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →MC9S08MR32CLH
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
MC68HC908MR32CB زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core | 68HC08 (HC08 CISC) |
| ڈیٹا بس چوڑائی | 8 bit |
| Program Memory Size | 32 KB (32K x 8) Flash |
| RAM Size | 768 bytes (768 x 8) |
| Number of I/O | 36 |
| زیادہ سے زیادہ کلاک فریکوئنسی | 8 MHz |
| سپلائی وولٹیج | 5 V |
| Oscillator Type | Internal |
| پیکیج / کیس | 56-SDIP (0.600 in / 15.24 mm) |
| ماؤنٹنگ ٹائپ | Through-Hole |
| Peripheral Features | PWM, Timer, LVD |
| Packaging | Tube |
| Family | M68HC08 |
MC68HC908MR32CB پن کنفیگریشن
| پن 1 | VSS — Ground reference |
| پن 2 | VDD — 5 V supply input |
| پن 3 | OSC1 — Oscillator input / external clock |
| پن 4 | OSC2 — Oscillator output |
| پن 5 | RESET — Active-low reset input |
| پن 6 | IRQ — External interrupt request |
| پن 7 | PTB0/TCH0 — I/O / timer channel |
| پن 8 | PTB1/TCH1 — I/O / timer channel |
| پن 9 | PTB2/TCH2 — I/O / timer channel |
| پن 10 | PTB3/TCH3 — I/O / timer channel |
| پن 11 | PTA0 — Port A I/O |
| پن 12 | PTA1 — Port A I/O |
| پن 13 | PTA2 — Port A I/O |
| پن 14 | PTA3 — Port A I/O |
| پن 15 | PTA4 — Port A I/O |
| پن 16 | PTA5 — Port A I/O |
| پن 17 | PTA6 — Port A I/O |
| پن 18 | PTA7 — Port A I/O |
| پن 19 | PTC0 — Port C I/O |
| پن 20 | PTC1 — Port C I/O |
| پن 21 | PTC2 — Port C I/O |
| پن 22 | PTC3 — Port C I/O |
| پن 23 | PTC4 — Port C I/O |
| پن 24 | PTC5 — Port C I/O |
| پن 25 | PTC6 — Port C I/O |
| پن 26 | PTC7 — Port C I/O |
| پن 27 | PWM0 — PWM output channel 0 |
| پن 28 | PWM1 — PWM output channel 1 |
| پن 29 | PWM2 — PWM output channel 2 |
| پن 30 | PWM3 — PWM output channel 3 |
| پن 31 | PWM4 — PWM output channel 4 |
| پن 32 | PWM5 — PWM output channel 5 |
| پن 33 | PWM6 — PWM output channel 6 |
| پن 34 | PWM7 — PWM output channel 7 |
| پن 35 | AN0 — ADC input / analog |
| پن 36 | AN1 — ADC input / analog |
| پن 37 | AN2 — ADC input / analog |
| پن 38 | AN3 — ADC input / analog |
| پن 39 | AN4 — ADC input / analog |
| پن 40 | AN5 — ADC input / analog |
| پن 41 | AN6 — ADC input / analog |
| پن 42 | AN7 — ADC input / analog |
| پن 43 | AVSS — Analog ground |
| پن 44 | AVDD — Analog supply |
| پن 45 | VREFH — ADC voltage reference high |
| پن 46 | VREFL — ADC voltage reference low |
| پن 47 | TDATA — SCI/serial transmit data |
| پن 48 | RDATA — SCI/serial receive data |
| پن 49 | SCLK — Serial clock |
| پن 50 | PTD0 — Port D I/O |
| پن 51 | PTD1 — Port D I/O |
| پن 52 | PTD2 — Port D I/O |
| پن 53 | PTD3 — Port D I/O |
| پن 54 | PTD4 — Port D I/O |
| پن 55 | PTD5 — Port D I/O |
| پن 56 | PTE0 — Port E I/O |
عام استعمالات
MC68HC908MR32CB کے لیے موزوں ہے 6 ایپلیکیشنs: Three-Phase BLDC Motor Drive, Single-Phase Induction Motor Control, Refrigerator and Washing-Machine Compressor Drivers, Industrial Fan and Pump Variable-Frequency Drives, Switched-Reluctance Motor Control, Low-End Servo and Stepper Motor Controllers.
Three-Phase BLDC Motor Drive
The MC68HC908MR32CB's integrated PWM channels and timer interface make it well suited to three-phase brushless DC (BLDC) motor commutation. With 8 MHz bus speed and 32 KB Flash, the firmware fits a complete state machine, commutation lookup table, and PI speed loop. The 768-byte RAM covers feedback samples and the control loop, while 36 I/O pins drive three half-bridge gate signals plus hall-sensor or back-EMF inputs. The HC08 CISC core offers deterministic 125 ns cycle time, which lets the MCU synchronize commutation with low jitter.
تجویز کردہ
Single-Phase Induction Motor Control
Single-phase AC induction motor controllers rely on triac or IGBT commutation timed via PWM and zero-cross detection. The MC68HC908MR32CB's 8 MHz throughput handles phase-angle control and soft-start ramps in real time. The 32 KB Flash comfortably hosts FIR-filtered mains frequency measurement and adaptive torque curves. The 56-SDIP package is convenient for through-hole motor-driver PCBs, where mechanical robustness is critical. With 36 I/O, the device manages user interfaces, supply monitoring, and triac firing logic.
تجویز کردہ
Refrigerator and Washing-Machine Compressor Drivers
Domestic appliance compressor drivers benefit from the MC68HC908MR32CB's combination of Flash memory for adaptive compressor algorithms and PWM for inverter-style variable-frequency drive. The 56-SDIP through-hole package suits the high-vibration, high-humidity environment of white-goods appliance electronics. With 8 MHz bus speed, the MCU drives inverter switches at up to several kHz switching frequency while still managing UART service, sensor sampling, and safety shutdown logic on a single chip.
تجویز کردہ
Industrial Fan and Pump Variable-Frequency Drives
Low-power variable-frequency drives for industrial fans and pumps integrate well with the MC68HC908MR32CB's HC08 core. The 32 KB Flash hosts current-loop and voltage-control algorithms, while the integrated timers provide accurate carrier-frequency synthesis. The 768-byte SRAM supports per-cycle current samples without needing external memory. The 36 I/O pins connect to current sensors, gate drivers, fault inputs, and command interfaces typically required in 1-2 horsepower industrial drives.
تجویز کردہ
Switched-Reluctance Motor Control
Switched-reluctance drives for small traction or industrial applications map cleanly onto the MC68HC908MR32CB's PWM architecture. With 36 I/O lines, the MCU can directly control four-phase stator windings through external gate drivers. The deterministic 8 MHz instruction cycle supports rotor-position decoding and energy-optimization commutation. The 32 KB Flash accommodates rotor-mapping tables and torque-shaping algorithms, while 768 bytes RAM provides operating headroom for interrupt-driven service routines.
تجویز کردہ
Low-End Servo and Stepper Motor Controllers
Stepper and low-power servo controllers are an economic application for the MC68HC908MR32CB. The 8 MHz core sequences phase-step tables in real time, while the Flash stores S-curve acceleration profiles. With 36 I/O, the MCU drives up to four steppers using H-bridges, plus a UART or I/O interface for command. The internal oscillator eliminates the external crystal in many designs, and the 56-SDIP package is straightforward to hand-prototype during product development of small automation hardware.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا MC68HC908MR32CB — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | MC68HC908MR16CB | MC908MR32VBE | MC908MR32CBE | MC9S08MR32CLH |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 56-SDIP (0.600 in) | 56-SDIP (0.600 in) | 56-PSDIP (0.600 in) | 56-PSDIP (0.600 in) | LQFP-64 |
| Core | 68HC08 (CISC) | 68HC08 (CISC) | 68HC08 (CISC) | 68HC08 (CISC) | HCS08 (modern variant) |
| Program Flash | 32 KB | 16 KB (-50%) | 32 KB | 32 KB | 32 KB |
| RAM | 768 B | 768 B | 768 B | 768 B | 768 B |
| Max Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8-16 MHz |
| I/O Pins | 36 | 36 | 36 | 36 | 44 (LQFP-64) |
| Mounting Type | Through-Hole | Through-Hole | Through-Hole | Through-Hole | Surface Mount |
| Lifecycle | Obsolete / Last Time Buy | Obsolete | Production (legacy) | Production (legacy) | Active (recommended for new designs) |
اہم امتیازی خصوصیات
- Specifically architected PWM for motor control (بمقابلہMC68HC908MR16CB)
- Same die, alternative orderable suffix (بمقابلہMC908MR32VBE / MC908MR32CBE)
- Drop-in for legacy motor boards with active production status (بمقابلہMC9S08MR32CLH)
ڈیزائن نوٹس
Decoupling critical: place a 0.1 uF high-frequency ceramic on each VDD/AVDD pair directly adjacent to the pins, and use the optional bulk current bypass (C2) on the main supply per Figure 1-4 of the NXP datasheet. The 68HC08 core draws sharply pulsed currents at the bus clock edge; without sufficient local decoupling, these current spikes can couple into analog inputs and disrupt ADC readings.
Keep the AGND/AVDD analog reference traces clean: separate analog supply ground from noisy digital ground by routing return currents thoughtfully on the PCB, and avoid running PWM switching traces under the crystal/clock traces. The 56-SDIP footprint is favorable for hand-prototyping motor-control boards; pin 1 is at top-left with the notch up per standard DIP convention.
Use the HC08's low-voltage detect (LVD) module to force a known-good reset under VDD sag conditions, since motor-drive supplies can droop sharply during PWM transition or DC-bus overload. Do not assume the internal oscillator is precise enough for serial communication: configure SCI to a baud rate the oscillator can reliably hit under all operating conditions, or supply an external crystal if UART timing is critical.
At 8 MHz with PWM edge rates in the kHz-MHz range, keep PWM trace lengths short and avoid ground-star separation. Series damping resistors (~22-33 ohm) on gate-driver outputs reduce ringing when the MCU drives a capacitive load directly. Adequate guard-band around the analog reference pins preserves ADC accuracy for feedback signals.
تعمیل کی معلومات
Compliance flags are not present in the verified web-data snippets. Confirm directly with NXP or your franchised distributor at order entry. The 56-SDIP through-hole package and 68HC08 legacy status are relevant context for compliance reviews.
