MC68HC908MR16CB - 8-Bit 8MHz HC08 MCU 16KB Flash 56-SDIP | NXP
Référence : MC68HC908MR16CB ✗ Fin de vie| Qté | Prix unitaire | 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 Présentation
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.
Alternatives de remplacement direct pour MC68HC908MR16CB — 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 MC68HC908MR16CB (même facteur de forme et même empreinte) — différant par Number of I/O, Program Memory Size, RAM Size.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
Aucune alternative de remplacement direct disponible pour ce produit.
Demander des alternativesMC68HC908MR16CB Valeurs maximales et caractéristiques électriques
| 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 |
| Boîtier | 56-SDIP (56-PSDIP), 0.600 inch, 15.24 mm |
| Type de montage | Through-Hole |
| Packaging | Tube |
| Part Status | Obsolete |
| Manufacturer | NXP USA Inc. (formerly Motorola Semiconductor, Freescale Semiconductor) |
Configuration des broches de MC68HC908MR16CB
| Broche 1 | IRQ — External interrupt request input |
| Broche 2 | RST — Reset input (active low) |
| Broche 3 | TCLK — Timer external clock input |
| Broche 4 | PWM1 — PWM output channel 1 |
| Broche 5 | PWM2 — PWM output channel 2 |
| Broche 6 | PWM3 — PWM output channel 3 |
| Broche 7 | PWM4 — PWM output channel 4 |
| Broche 8 | PWM5 — PWM output channel 5 |
| Broche 9 | PWM6 — PWM output channel 6 |
| Broche 10 | FAULTOUT — PWM fault output to external driver |
| Broche 11 | TACH — Timer/PWM tachometer input |
| Broche 12 | VREFH — ADC high reference voltage |
| Broche 13 | VREFL — ADC low reference voltage |
| Broche 14 | VDD — Digital supply voltage (+5V) |
| Broche 15 | VSS — Digital ground |
| Broche 16 | OSC1 — Crystal/oscillator input |
| Broche 17 | OSC2 — Crystal/oscillator output |
| Broche 18 | BGND — Background debug mode pin |
| Broche 19 | PTA0 — General I/O port A bit 0 |
| Broche 20 | PTA1 — General I/O port A bit 1 |
| Broche 21 | PTA2 — General I/O port A bit 2 |
| Broche 22 | PTA3 — General I/O port A bit 3 |
| Broche 23 | PTA4 — General I/O port A bit 4 |
| Broche 24 | PTA5 — General I/O port A bit 5 |
| Broche 25 | PTA6 — General I/O port A bit 6 |
| Broche 26 | PTA7 — General I/O port A bit 7 |
| Broche 27 | PTB0 — General I/O port B bit 0 |
| Broche 28 | PTB1 — General I/O port B bit 1 |
| Broche 29 | PTB2 — General I/O port B bit 2 |
| Broche 30 | PTB3 — General I/O port B bit 3 |
| Broche 31 | PTB4 — General I/O port B bit 4 |
| Broche 32 | PTB5 — General I/O port B bit 5 |
| Broche 33 | PTB6 — General I/O port B bit 6 |
| Broche 34 | PTB7 — General I/O port B bit 7 |
| Broche 35 | PTC0 — General I/O port C bit 0 |
| Broche 36 | PTC1 — General I/O port C bit 1 |
| Broche 37 | PTC2 — General I/O port C bit 2 |
| Broche 38 | PTC3 — General I/O port C bit 3 |
| Broche 39 | PTC4 — General I/O port C bit 4 |
| Broche 40 | PTC5 — General I/O port C bit 5 |
| Broche 41 | PTC6 — General I/O port C bit 6 |
| Broche 42 | PTC7 — General I/O port C bit 7 |
| Broche 43 | PTD0 — General I/O port D bit 0 |
| Broche 44 | PTD1 — General I/O port D bit 1 |
| Broche 45 | PTD2 — General I/O port D bit 2 / RxD |
| Broche 46 | PTD3 — General I/O port D bit 3 / TxD |
| Broche 47 | PTD4 — General I/O port D bit 4 / SCLK |
| Broche 48 | PTD5 — General I/O port D bit 5 / MISO |
| Broche 49 | PTD6 — General I/O port D bit 6 / MOSI |
| Broche 50 | PTD7 — General I/O port D bit 7 / SS |
| Broche 51 | PTE0 — General I/O port E bit 0 |
| Broche 52 | PTE1 — General I/O port E bit 1 |
| Broche 53 | PTE2 — General I/O port E bit 2 |
| Broche 54 | PTE3 — General I/O port E bit 3 |
| Broche 55 | VDDA — Analog supply voltage (+5V) |
| Broche 56 | VSSA — Analog ground |
Applications typiques
MC68HC908MR16CB convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MC68HC908MR16CB — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Integrated motor-control PWM with dead-time insertion (vs Generic HC08 MCU without motor-control PWM)
- 16 KB FLASH in a 56-SDIP through-hole package (vs Modern Cortex-M0 MCU in QFN/SOIC SMD package)
- Drop-in upgrade path to MC68HC908MR32CB (vs MC68HC908MR32CB)
Notes de conception
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.
Informations de conformité
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.
