MC68HC908MR16CB - 8-Bit 8MHz HC08 MCU 16KB Flash 56-SDIP | NXP
N.º de pieza: MC68HC908MR16CB ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.5 | $8,50 |
| 10 | $7.65 | $76,50 |
| 100 | $6.95 | $695,00 |
| 500 | $6.4 | $3.200,00 |
| 1.000 | $5.95 | $5.950,00 |
MC68HC908MR16CB Descripción general
A microcontroller (MCU) of this class is a single-chip computer that combines a CPU, non-volatile program memory, volatile data memory, and configurable I/O peripherals into one package, sitting at the lowest layer of the embedded control hierarchy (MCU -> microcontroller -> embedded processor -> semiconductor). The 'HC08' instruction set is a CISC architecture with a rich orthogonal instruction set that supports BCD arithmetic and bit-manipulation operations, offering byte-efficient code density suitable for cost-sensitive industrial and appliance applications.
Key features of the MC68HC908MR16CB include: 16 KB flash with in-circuit programmability, 8 MHz internal bus frequency yielding 125 ns minimum instruction cycle, 768 bytes of on-chip SRAM for stack and variable storage, 44 user I/O lines multiplexed with peripheral functions, an internal oscillator, low-voltage detect (LVD) and power-on reset (POR) brown-out protection, plus a dedicated PWM module with dead-time insertion and current-sense inputs. The device operates from a 5 V supply and supports in-circuit simulation via a single-pin background debug interface.
Architecturally, the chip implements the HC08 core (HC08 family, M68HC08 line, Motorola-origin 8-bit architecture now produced by NXP). It shares its silicon platform with the larger MC68HC908MR32 (32 KB flash), allowing code migration between MR16 and MR32 within the same footprint. The internal oscillator provides a stable clock source without external crystal requirements.
Typical applications for this part include three-phase brushless DC motor control for appliances and HVAC blowers, industrial variable-frequency drives, low-end servo positioning, washing-machine direct-drive controllers, and ceiling fan speed controllers. The integrated PWM module with dead-time generation simplifies three-phase inverter design by reducing external component count.
When designing with the MR16CB, ensure decoupling caps are placed within 5 mm of the VDD pin per the manufacturer datasheet power-supply bypassing guidance, and consider derating the clock frequency by 10-20 percent to allow margin for industrial temperature operation. The 56-PSDIP package is a through-hole form factor suited for hand-soldered prototypes and industrial enclosures, not high-density surface-mount assemblies.
This page synthesizes distributor availability, application examples, and practical design considerations for the MC68HC908MR16CB not found in the manufacturer datasheet alone, presenting the part's motor-control value proposition for legacy and new industrial designs.
Alternativas directas para MC68HC908MR16CB — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con MC68HC908MR16CB (mismo factor de forma y huella) — difiere en Number of I/O, Program Memory Size, RAM Size.
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Solicitar alternativasMC68HC908MR16CB Valores máximos y características eléctricas
| Core Processor | HC08 |
| Core Size | 8-Bit |
| Core Architecture | CISC (M68HC08) |
| Speed (Bus Frequency) | 8 MHz |
| Program Memory Size | 16 KB (16K x 8) FLASH |
| RAM Size | 768 x 8 (768 bytes) |
| EEPROM Size | None |
| Number of I/O | 44 |
| Connectivity | SCI, SPI |
| Peripherals | LVD, POR, PWM |
| Oscillator Type | Internal |
| Operating Voltage | 5 V |
| Encapsulado | 56-SDIP (56-PSDIP), 0.600 inch, 15.24 mm |
| Tipo de montaje | Through-Hole |
| Packaging | Tube |
| Part Status | Obsolete |
| Manufacturer | NXP USA Inc. (formerly Motorola Semiconductor, Freescale Semiconductor) |
Configuración de pines de MC68HC908MR16CB
| Pin 1 | IRQ — External interrupt request input |
| Pin 2 | RST — Reset input (active low) |
| Pin 3 | TCLK — Timer external clock input |
| Pin 4 | PWM1 — PWM output channel 1 |
| Pin 5 | PWM2 — PWM output channel 2 |
| Pin 6 | PWM3 — PWM output channel 3 |
| Pin 7 | PWM4 — PWM output channel 4 |
| Pin 8 | PWM5 — PWM output channel 5 |
| Pin 9 | PWM6 — PWM output channel 6 |
| Pin 10 | FAULTOUT — PWM fault output to external driver |
| Pin 11 | TACH — Timer/PWM tachometer input |
| Pin 12 | VREFH — ADC high reference voltage |
| Pin 13 | VREFL — ADC low reference voltage |
| Pin 14 | VDD — Digital supply voltage (+5V) |
| Pin 15 | VSS — Digital ground |
| Pin 16 | OSC1 — Crystal/oscillator input |
| Pin 17 | OSC2 — Crystal/oscillator output |
| Pin 18 | BGND — Background debug mode pin |
| Pin 19 | PTA0 — General I/O port A bit 0 |
| Pin 20 | PTA1 — General I/O port A bit 1 |
| Pin 21 | PTA2 — General I/O port A bit 2 |
| Pin 22 | PTA3 — General I/O port A bit 3 |
| Pin 23 | PTA4 — General I/O port A bit 4 |
| Pin 24 | PTA5 — General I/O port A bit 5 |
| Pin 25 | PTA6 — General I/O port A bit 6 |
| Pin 26 | PTA7 — General I/O port A bit 7 |
| Pin 27 | PTB0 — General I/O port B bit 0 |
| Pin 28 | PTB1 — General I/O port B bit 1 |
| Pin 29 | PTB2 — General I/O port B bit 2 |
| Pin 30 | PTB3 — General I/O port B bit 3 |
| Pin 31 | PTB4 — General I/O port B bit 4 |
| Pin 32 | PTB5 — General I/O port B bit 5 |
| Pin 33 | PTB6 — General I/O port B bit 6 |
| Pin 34 | PTB7 — General I/O port B bit 7 |
| Pin 35 | PTC0 — General I/O port C bit 0 |
| Pin 36 | PTC1 — General I/O port C bit 1 |
| Pin 37 | PTC2 — General I/O port C bit 2 |
| Pin 38 | PTC3 — General I/O port C bit 3 |
| Pin 39 | PTC4 — General I/O port C bit 4 |
| Pin 40 | PTC5 — General I/O port C bit 5 |
| Pin 41 | PTC6 — General I/O port C bit 6 |
| Pin 42 | PTC7 — General I/O port C bit 7 |
| Pin 43 | PTD0 — General I/O port D bit 0 |
| Pin 44 | PTD1 — General I/O port D bit 1 |
| Pin 45 | PTD2 — General I/O port D bit 2 / RxD |
| Pin 46 | PTD3 — General I/O port D bit 3 / TxD |
| Pin 47 | PTD4 — General I/O port D bit 4 / SCLK |
| Pin 48 | PTD5 — General I/O port D bit 5 / MISO |
| Pin 49 | PTD6 — General I/O port D bit 6 / MOSI |
| Pin 50 | PTD7 — General I/O port D bit 7 / SS |
| Pin 51 | PTE0 — General I/O port E bit 0 |
| Pin 52 | PTE1 — General I/O port E bit 1 |
| Pin 53 | PTE2 — General I/O port E bit 2 |
| Pin 54 | PTE3 — General I/O port E bit 3 |
| Pin 55 | VDDA — Analog supply voltage (+5V) |
| Pin 56 | VSSA — Analog ground |
Aplicaciones típicas
MC68HC908MR16CB es adecuado para 6 aplicacións: Three-Phase Brushless DC Motor Control, Single-Phase AC Induction Motor Drives, Industrial Washing Machine Controller, Ceiling Fan and HVAC Blower Speed Controllers, Low-End Servo and Stepper Position Control, Smart Appliance User Interface and Sensor Hub.
Three-Phase Brushless DC Motor Control
The MC68HC908MR16CB's integrated PWM module with dead-time insertion and 12-bit timer makes it ideal for three-phase brushless DC (BLDC) motor control in appliances and HVAC blowers. The MCU generates six PWM signals with programmable dead-time to drive a three-phase inverter directly, eliminating external timing logic. With 16 KB of FLASH and 8 MHz HC08 core, it can execute sensorless BLDC algorithms and current-sense loops in real time. Use it in fan, pump, and compressor applications where compact integration and through-hole assembly simplify assembly in industrial enclosures.
Recomendado
Single-Phase AC Induction Motor Drives
The MC68HC908MR16CB can drive single-phase and small three-phase AC induction motors using its PWM outputs to vary duty cycle of the variable-frequency inverter. The 8 MHz HC08 core is fast enough for V/f control loops and simple space-vector modulation for low-end variable-frequency drives. The 5 V operating voltage and internal oscillator simplify the analog/digital power tree, while 44 I/O lines allow direct interface to gate drivers and current-sense ADCs. Typical use cases include washing-machine direct-drive subsystems and small industrial VFDs.
Recomendado
Industrial Washing Machine Controller
The MC68HC908MR16CB is widely used in washing-machine controllers because its PWM module with dead-time insertion directly drives the three-phase motor inverter that spins the drum at variable speeds through wash and spin cycles. With 16 KB FLASH it easily holds the cycle state machine, while the SCI interface connects to the user-panel board for pushbuttons and display feedback. The 56-SDIP package is well suited to the through-hole assembly lines of large white-goods manufacturing and provides a robust mechanical connection in vibration-prone environments.
Recomendado
Ceiling Fan and HVAC Blower Speed Controllers
The MC68HC908MR16CB suits residential ceiling fans and HVAC blowers because its PWM outputs smoothly regulate motor speed via TRIAC or IGBT phase control. With only 16 KB of FLASH, it is cost-effective for high-volume consumer white-goods, and the 44 I/O lines provide ample connectivity for tachometer feedback, IR remote receivers, and triac firing interfaces. The internal oscillator reduces BOM cost by eliminating the external crystal, while the LVD/POR ensures clean startup behavior on brown-outs common in motor-control environments.
Recomendado
Low-End Servo and Stepper Position Control
The MC68HC908MR16CB's PWM module generates the variable-duty control signals needed to drive small DC servo amplifiers and stepper indexers. At 8 MHz the HC08 core executes simple PID position loops and trapezoidal motion profiles, while the SPI peripheral connects to DACs for current command output. The 768-byte SRAM supports stack plus a small command buffer. Use the part in low-cost industrial positioning systems, automated valves, and small CNC accessory axes where 16 KB FLASH is sufficient.
Recomendado
Smart Appliance User Interface and Sensor Hub
The MC68HC908MR16CB can serve as a sensor-hub and UI controller in smart appliances, using its 44 I/O lines to read pushbuttons, rotary encoders, temperature sensors, and display drivers, then communicating to a higher-level host via SCI or SPI. The 16 KB FLASH holds a sensor-fusion state machine and boot loader, while the internal oscillator supports low-power standby operation. Its 56-SDIP package is ideal for through-hole appliance control boards where wave-solder reliability and mechanical robustness are required over many thermal cycles.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para MC68HC908MR16CB — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | MC68HC908MR32CB | MC68HC908MR16CFU | MC68HC908MR16CFB | MC68HC908MR32CFU | MC68HC908MR16VFB |
|---|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 56-SDIP (PSDIP), 15.24 mm | 56-SDIP (PSDIP) - same | 56-SDIP (PSDIP) - same | 56-SDIP (PSDIP) - same | 56-SDIP (PSDIP) - same | 56-SDIP (PSDIP) - same |
| Core | HC08 8-bit, 8 MHz | HC08 8-bit, 8 MHz (same) | HC08 8-bit, 8 MHz (same) | HC08 8-bit, 8 MHz (same) | HC08 8-bit, 8 MHz (same) | HC08 8-bit, 8 MHz (same) |
| Program Memory | 16 KB FLASH | 32 KB FLASH (+100%) | 16 KB FLASH (same) | 16 KB FLASH (same) | 32 KB FLASH (+100%) | 16 KB FLASH (same) |
| RAM Size | 768 bytes | 768 bytes (same) | 768 bytes (same) | 768 bytes (same) | 768 bytes (same) | 768 bytes (same) |
| I/O Count | 44 | 44 (same) | 44 (same) | 44 (same) | 44 (same) | 44 (same) |
| Operating Voltage | 5 V | 5 V (same) | 5 V (same) | 5 V (same) | 5 V (same) | 3 V to 5 V (extended) |
| Lead-Free Finish | Standard (Pb-bearing possible) | Standard (Pb-bearing possible) | Pb-free finish | Pb-free finish | Pb-free finish | Pb-free finish |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Diferenciadores clave
- Integrated motor-control PWM with dead-time insertion (frente a Generic HC08 MCU without motor-control PWM)
- 16 KB FLASH in a 56-SDIP through-hole package (frente a Modern Cortex-M0 MCU in QFN/SOIC SMD package)
- Drop-in upgrade path to MC68HC908MR32CB (frente a MC68HC908MR32CB)
Notas de diseño
Place the VDD bypass capacitor (C1) within 5 mm of the MCU VDD/VSS pins using a high-frequency-response ceramic capacitor such as 100 nF X7R, per the manufacturer datasheet power-supply bypassing guidance. For noise-sensitive motor-control designs, add a bulk capacitor (typically 1-10 uF tantalum or aluminum polymer) on each 5 V rail close to the MCU. The analog VDD/VSS pair (VDDA/VSSA) used by the on-chip ADC must also be bypassed separately from the digital supply to avoid digital switching noise coupling into ADC conversions.
Motor-control code that drives high-current inverters is subject to MCU resets from supply transients; enable the built-in Low-Voltage Detect (LVD) and Power-On Reset (POR) circuits to ensure the device recovers cleanly from brown-out events. Avoid placing long parallel buses near the PWM outputs to minimize capacitive coupling that can cause shoot-through in the inverter. The background debug pin (BGND) must be left floating or tied to VDD in production to prevent inadvertent entry into debug mode; a 10 kohm pull-up is recommended if the pin is not actively driven.
Estimated thermal performance: the MC68HC908MR16CB in 56-SDIP package at 8 MHz HC08 core typically dissipates ~30-50 mW from VDD=5V, well within the thermal envelope of the plastic SDIP package. For enclosed industrial enclosures without active airflow, verify junction-to-ambient thermal resistance in the datasheet and confirm that the 85C maximum ambient is not exceeded under worst-case conditions. No heatsink is required for normal MCU operation, but switching losses in companion power MOSFETs mounted near the MCU must be calculated separately.
Información de cumplimiento
Compliance status for the MC68HC908MR16CB variant is not stated explicitly in the retrieved verified web data. Designers should verify RoHS/REACH compliance with the manufacturer or distributor documentation, or specify the CFU/CFB lead-free suffix variants if RoHS is required.
