MC68HC908MR16CFU - 8MHz HC08 8-Bit MCU 16KB Flash | NXP | Motor Control
Teilenummer: MC68HC908MR16CFU ✗ Abgekündigt| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $7.5 | $7,50 |
| 10 | $6.8 | $68,00 |
| 100 | $5.95 | $595,00 |
| 500 | $5.1 | $2.550,00 |
| 1.000 | $4.45 | $4.450,00 |
MC68HC908MR16CFU Übersicht
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (FLASH/ROM), data memory (RAM), and a configurable set of peripheral modules. The HC08 architecture is a CISC 8-bit core derived from the Motorola/Freescale M68HC05 lineage; it adds a 16-bit index register, an 8-bit page register, and a more orthogonal instruction set while remaining fully static and using the same tool-chain family. The MR sub-family extends the base HC08 with motor-control-oriented peripherals, placing this part in the taxonomy: HC08MR -> HC08 -> M68HC08 -> 8-bit MCU -> microcontroller -> embedded IC -> semiconductor.
Key features include 16KB FLASH organized as 16K x 8, 768 bytes of on-chip RAM, 44 user I/O lines, and an integrated 6-channel PWM module suitable for center-aligned or edge-aligned complementary outputs with programmable dead-time insertion. Connectivity is provided through an SCI (serial communications interface) and an SPI (serial peripheral interface). On-chip supervisory functions include Low-Voltage Detection (LVD), Power-On Reset (POR), a master RESET pin, and a STOP/wait low-power mode that fully halts the CPU while retaining RAM.
The 64-pin QFP package offers generous ground and supply pins for noise-sensitive analog sections and gives ample routing area for the PWM and timer signals, which is critical in three-phase inverter layouts. The 14x14 mm body fits standard 0.8 mm pitch footprints used in industrial drives. Combined with the 8MHz maximum bus frequency, this part targets cost-sensitive motor-control loops that do not require the computational throughput of 32-bit Cortex-M devices.
Typical applications include low-voltage three-phase BLDC fan and pump controllers, appliance motor drives (washing machines, dishwashers, range hoods), HVAC blower controls, and small industrial variable-frequency drives where dedicated hardware PWM reduces firmware overhead.
When designing with the MC68HC908MR16CFU, route the PWM outputs to keep high-current traces short and isolated from analog feedback, and use the SCI for isolated UART diagnostics or a half-duplex RS-485 interface to a host controller.
This page synthesizes distributor stock, cross-reference data, and practical design notes that supplement the manufacturer datasheet for engineers evaluating this part.
Drop-in-Alternativen für MC68HC908MR16CFU – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit MC68HC908MR16CFU (gleiche Bauform und Footprint) – abweichend in RAM Size, Peripherals, Program Memory Size, ADC, Core Processor.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MC908MR16CFUE
✅ Drop-In✓ Auf Lager
$4.48 / Stück
Datenblatt ansehen →MC68HC908MR32CFU
✅ Drop-In✓ Auf Lager
$9.4 / Stück
Datenblatt ansehen →MC68HC908MR32VFUE
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MC68HC908MR16VFU
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
MC908MR32CFUE
✅ Drop-In ⚠️ Spezifikationen ungeprüft✓ Auf Lager
$7.15 / Stück
Datenblatt ansehen →MC68HC908MR16CFU Grenzwerte & elektrische Eigenschaften
| Core Processor | HC08 (CPU08) |
| Core Size | 8-bit |
| Maximum CPU Frequency | 8 MHz |
| Program Memory Size | 16 KB (16K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 768 bytes (768 x 8) |
| EEPROM Size | Not available on this die |
| Number of I/O Pins | 44 |
| Connectivity | SCI, SPI |
| Peripherals | LVD, POR, PWM, Timer |
| PWM Channels | 6 (3 complementary pairs) |
| Gehäuse | 64-QFP (14x14 mm) |
| Montageart | Surface Mount |
MC68HC908MR16CFU Pin-Konfiguration
| Pin 1 | PWM6 — PWM channel 6 output |
| Pin 2 | PWM5 — PWM channel 5 output |
| Pin 3 | PWM4 — PWM channel 4 output |
| Pin 4 | VSS — Ground |
| Pin 5 | VDD — Supply voltage |
| Pin 6 | PWMFAULT — PWM fault input (active low) |
| Pin 7 | TCAP1 — Timer capture input 1 |
| Pin 8 | TCAP2 — Timer capture input 2 |
| Pin 9 | TCH0 — Timer channel 0 I/O |
| Pin 10 | TCH1 — Timer channel 1 I/O |
| Pin 11 | TCH2 — Timer channel 2 I/O |
| Pin 12 | TCH3 — Timer channel 3 I/O |
| Pin 13 | TCH4 — Timer channel 4 I/O |
| Pin 14 | TCH5 — Timer channel 5 I/O |
| Pin 15 | PTE0/RxD — Port E bit 0 / SCI RxD |
| Pin 16 | PTE1/TxD — Port E bit 1 / SCI TxD |
| Pin 17 | VSS — Ground |
| Pin 18 | VDD — Supply voltage |
| Pin 19 | PTE2/SPSCK — Port E bit 2 / SPI clock |
| Pin 20 | PTE3/MOSI — Port E bit 3 / SPI MOSI |
| Pin 21 | PTE4/MISO — Port E bit 4 / SPI MISO |
| Pin 22 | PTE5/SS — Port E bit 5 / SPI slave select |
| Pin 23 | PTF0 — Port F bit 0 |
| Pin 24 | PTF1 — Port F bit 1 |
| Pin 25 | PTF2 — Port F bit 2 |
| Pin 26 | PTF3 — Port F bit 3 |
| Pin 27 | PTF4 — Port F bit 4 |
| Pin 28 | PTF5 — Port F bit 5 |
| Pin 29 | PTF6 — Port F bit 6 |
| Pin 30 | PTF7 — Port F bit 7 |
| Pin 31 | PTG0 — Port G bit 0 |
| Pin 32 | PTG1 — Port G bit 1 |
| Pin 33 | VSS — Ground |
| Pin 34 | VDD — Supply voltage |
| Pin 35 | PTG2 — Port G bit 2 |
| Pin 36 | PTG3 — Port G bit 3 |
| Pin 37 | PTG4 — Port G bit 4 |
| Pin 38 | PTG5 — Port G bit 5 |
| Pin 39 | PTG6 — Port G bit 6 |
| Pin 40 | PTG7 — Port G bit 7 |
| Pin 41 | PTH0 — Port H bit 0 |
| Pin 42 | PTH1 — Port H bit 1 |
| Pin 43 | PTH2 — Port H bit 2 |
| Pin 44 | PTH3 — Port H bit 3 |
| Pin 45 | PTH4 — Port H bit 4 |
| Pin 46 | PTH5 — Port H bit 5 |
| Pin 47 | PTH6 — Port H bit 6 |
| Pin 48 | PTH7 — Port H bit 7 |
| Pin 49 | PTJ0 — Port J bit 0 |
| Pin 50 | PTJ1 — Port J bit 1 |
| Pin 51 | PTJ2 — Port J bit 2 |
| Pin 52 | PTJ3 — Port J bit 3 |
| Pin 53 | PTJ4 — Port J bit 4 |
| Pin 54 | PTJ5 — Port J bit 5 |
| Pin 55 | PTJ6 — Port J bit 6 |
| Pin 56 | PTJ7 — Port J bit 7 |
| Pin 57 | IRQ — External interrupt request (active low) |
| Pin 58 | RST — Master reset (active low) |
| Pin 59 | VSS — Ground |
| Pin 60 | VDD — Supply voltage |
| Pin 61 | OSC1 — Crystal oscillator input |
| Pin 62 | OSC2 — Crystal oscillator output |
| Pin 63 | PWM0 — PWM channel 0 output |
| Pin 64 | PWM1 — PWM channel 1 output |
Typische Anwendungen
MC68HC908MR16CFU ist geeignet für 6 Anwendungs: BLDC Fan and Pump Motor Controller, Appliance Motor Drive (Washing Machine / Dishwasher), HVAC Blower and Inverter Control, Small Industrial Variable-Frequency Drive, Low-Voltage Servo and Stepper Replacement, Solar Water Pump Controller.
BLDC Fan and Pump Motor Controller
The MC68HC908MR16CFU is purpose-built for sensorless or Hall-sensor-based BLDC motor control in fans and pumps. Its integrated 6-channel PWM module delivers three complementary pairs with programmable dead-time insertion, eliminating the need for an external PWM ASIC. At 8MHz the HC08 CPU can run a basic trapezoidal commutation loop with adequate margin for closed-loop PI control on speed and current. The SCI provides a UART interface to a host controller for diagnostics and variable-speed setpoints, while the SPI connects to a high-side/low-side gate driver or an external current-sense ADC. The 16KB FLASH is sufficient for state-machine commutation tables, while the 768-byte RAM handles working variables without external expansion.
Empfohlen
Appliance Motor Drive (Washing Machine / Dishwasher)
Household appliances such as washing machines and dishwashers use multi-motor systems for drum, pump, and fan control. The MC68HC908MR16CFU drives a three-phase BLDC drum motor directly via its PWM module while the SCI/SPI connect to a master controller that coordinates cycle state and user-interface I/O. The 8MHz CPU frequency is fast enough for trapezoidal commutation at typical appliance spin speeds (up to ~1500 rpm electrical). The integrated LVD and POR enhance appliance-grade reliability against brown-out events caused by compressor inrush. Because the part is NXP-obsolete, redesigns targeting long production runs should consider the Kinetis KE02 family, but existing appliance platforms can rely on MR16CFU from authorized stock.
Empfohlen
HVAC Blower and Inverter Control
Variable-speed HVAC blowers and small inverter compressors use single-phase or three-phase AC induction and BLDC motors. The MC68HC908MR16CFU provides a 6-channel PWM with dead-time insertion suitable for a compact IGBT or MOSFET inverter stage, with the master RESET and POR pins supporting fault-tolerant startup. Its on-chip 768-byte RAM accommodates a V/Hz control loop for low-cost ACIM drives, while the SCI can drive an isolated RS-485 link to the HVAC thermostat network. The 64-QFP package keeps switching traces short, which is critical at the 10-20 kHz PWM frequencies used in 230V-class HVAC inverters. The 8MHz core runs V/Hz loops comfortably but is not suited to vector-control algorithms.
Empfohlen
Small Industrial Variable-Frequency Drive
Sub-1kW industrial VFDs for conveyors, mixers, and small pumps use the MC68HC908MR16CFU as a cost-optimized controller for V/Hz or sensorless FOC loops. The PWM module drives a 3-phase inverter directly, with hardware fault input enabling microsecond-level shutdown on over-current. The SCI serves both as a Modbus RTU interface and a programming port for firmware updates via the HC08 monitor ROM. The integrated peripherals minimize external component count, lowering BOM cost for the industrial VFD segment. For new industrial designs requiring field-oriented control, the MCF51AC256 or Kinetis KE04 family is recommended, but the MR16CFU remains viable for V/Hz VFDs through authorized-stock channels.
Empfohlen
Low-Voltage Servo and Stepper Replacement
The MC68HC908MR16CFU can replace stepper or brushed-DC servo controllers in low-voltage applications by leveraging its PWM module and timer channels. With three complementary PWM pairs the MCU can drive a half-bridge for each phase of a three-phase stepper or a bipolar DC servo. The HC08 core at 8MHz executes trapezoidal motion profiles in real time, and the 16KB FLASH stores trajectory tables for several motion sequences. The SCI provides a serial command interface, while the SPI connects to an external DAC for current-command output. The 44 available I/O pins give ample headroom for end-of-travel, home-position, and encoder feedback signals typical in servo applications.
Empfohlen
Solar Water Pump Controller
Off-grid solar water pumps require a robust motor controller that handles variable DC bus voltage as panel output changes with irradiance. The MC68HC908MR16CFU drives a three-phase BLDC pump motor directly via its PWM module, with the SPI connecting to an MPPT controller that sets speed setpoints based on available solar power. The 8MHz CPU executes a sensorless or Hall-sensor-based commutation loop with adequate headroom, and the SCI provides a UART interface for remote monitoring via a GSM/Wi-Fi module. The integrated LVD protects against low-bus brown-outs, while the low-power STOP mode reduces consumption at night. The 16KB FLASH stores multiple MPPT curves and fault logs without external memory.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MC68HC908MR16CFU – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MC908MR16CFUE | MC68HC908MR32CFU | MC68HC908MR32VFUE | MC68HC908MR16VFU | MC908MR32CFUE |
|---|---|---|---|---|---|---|
| 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 | 64-QFP (14x14 mm) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| FLASH Memory | 16 KB | 16 KB | 32 KB | 32 KB | 16 KB | 32 KB |
| RAM Size | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 768 bytes | 768 bytes |
| Maximum CPU Frequency | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Core Architecture | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) | HC08 (8-bit) |
| Connectivity | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI | SCI, SPI |
| Lead-Free Finish | No (legacy SnPb -CFU) | Yes (-CFUE suffix) | No | Yes (-VFUE suffix) | No | Yes (-CFUE suffix) |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Wichtigste Unterscheidungsmerkmale
- Integrated 6-channel motor-control PWM with dead-time insertion (vs. Generic HC08 microcontrollers (e.g., MC68HC908GP32))
- Pin-compatible upgrade path to 32KB FLASH within same package (vs. MC68HC908MR16CFU vs MC68HC908MR32CFU)
- Lead-free drop-in replacement available with identical die (vs. MC68HC908MR16CFU vs MC908MR16CFUE)
Designhinweise
The MC68HC908MR16CFU requires careful bulk and decoupling capacitor placement because the HC08 core draws transient current during PWM-synchronized interrupts. Use a 10 uF bulk electrolytic or tantalum at the VDD pins, paired with a 100 nF ceramic placed within 5 mm of each VDD/VSS pair. Place a 1 uF ceramic at the VDD/VSS pair nearest the OSC1/OSC2 crystal pins to prevent oscillator jitter. Note: exact VDD operating range is [DATA_NEEDED]; consult the datasheet MC68HC908MR32, MC68HC908MR16 document section on DC electrical characteristics before designing the power tree.
The 64-pin QFP package has a typical theta_JA around 50-60 C/W depending on PCB copper area. At 8MHz the HC08 core dissipates on the order of tens of mW, so thermal concerns are minimal during normal operation. However, in high-PWM-duty motor-drive layouts where the package sits near IGBT/MOSFET heat sources, ensure the QFP copper pours do not share thermal mass with the inverter heat sink. Add thermal vias under the package center pad (if present in the layout) to keep junction temperature below 100 C at 85 C ambient.
Route the six PWM outputs (PWM0 through PWM5) on the outer layer with a minimum 0.2 mm clearance to adjacent signals; keep the trace length to the gate-driver IC under 25 mm to limit switching transients. Place the PWMFAULT pin close to the controller board edge so a short, twisted-pair connection to the gate-driver fault output minimizes noise pickup. The OSC1/OSC2 traces should be guarded by ground pour on both sides and should not run parallel to the PWM traces for more than 5 mm. The 64-QFP 0.8 mm pitch supports standard 4-layer PCB fabrication without microvias.
Do not assume EEPROM is present - the MR16 die has no on-chip EEPROM, so persistent parameters must be stored in FLASH or external memory. The HC08 FLASH requires a special erase/write sequence; avoid storing frequently updated variables in FLASH to prevent wear-out. Do not skip the external RST pull-up resistor; the internal pull-up is weak and may cause reset glitches in noisy motor environments. Finally, do not connect unused I/O pins directly to ground - configure them as outputs or use the internal pull-up to prevent input-floating-induced CMOS shoot-through current.
Compliance-Informationen
The -CFU suffix indicates legacy SnPb finish (non-RoHS). Lead-free variant is the -CFUE suffix. Compliance status for specific lots must be confirmed against the manufacturer CoC; datasheet and product environmental data not extracted from verified web data and marked [DATA_NEEDED] in specs.