MCHC908MR8CFAE - HC08 8-Bit MCU 8KB Flash 8MHz | NXP
Teilenummer: MCHC908MR8CFAE ✗ AbgekündigtMCHC908MR8CFAE Übersicht
Key features include 8KB (8K x 8) Flash program memory, 256 bytes of RAM, a 10-channel 8-bit ADC, two PWM channels with current-sense capability optimized for brushless DC motor control, multiple timers (TIM1, TIM2, pulse-width modulation edge-aligned PWM), an internal oscillator, and low-power Stop/Wait modes. Per the manufacturer datasheet, the MCHC908MR8CFAE operates from 3.0V to 5.5V and supports industrial temperature grade (-40C to +85C).
The HC08 (HCMOS08) is a true single-chip, 8-bit CISC microcontroller family from Freescale/NXP Semiconductors; it sits within the broader taxonomy microcontroller -> embedded processor -> semiconductor. The 8-bit CPU executes a M68HC08 instruction set with indexed addressing, 16-bit index register, stack pointer, and condition-code register, delivering predictable interrupt latency and deterministic cycle counts. The 8 KB Flash array is segmented to allow in-application reprogramming while the application continues to run from a separate block, supporting firmware updates without external boot ROM.
Typical applications include ceiling-fan variable-frequency drives, washing-machine motor controllers, refrigerator compressors, single-phase appliance pumps, and small industrial variable-speed drives. The integrated PWM, ADC, and timers make the device appropriate for closed-loop motor control with minimal external analog components. Designers also use the LQFP-32 footprint with copper ground pour for direct PCB heatsinking at sustained switching duty.
When designing with this part, retain the BDM header for in-system programming and debug access. The internal oscillator is factory-trimmed and eliminates the external crystal in many appliance designs; for higher timing accuracy, attach a 32.768 kHz or HF crystal to the OSC1/OSC2 pins reserved for the PLL option.
This page synthesizes current distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in-Alternativen für MCHC908MR8CFAE – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
MCHC908MR16CFAE
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCHC908MR8CFA
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCHC908MR8CFAE-RL1
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCHC908MR8CPE
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCHC908MR32CFAE
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MCHC908MR8CFAE Grenzwerte & elektrische Eigenschaften
| Core | HC08 (M68HC08) CISC, 8-bit |
| Program Memory | 8 KB (8K x 8) Flash, in-system programmable |
| RAM | 256 bytes |
| Maximum CPU Clock | 8 MHz (internal bus) |
| Operating Voltage | 3.0 V to 5.5 V |
| ADC | 10-channel, 8-bit |
| PWM Channels | 2 channels (motor-control optimized) |
| Timers | TIM1, TIM2, pulse-width measurement |
| I/O Pins | Up to 27 general-purpose I/O |
| Serial Interface | SCI (UART), SPI |
| On-chip Debug | Background Debug Mode (BDM) |
| Betriebstemperaturbereich | -40 C to +85 C (industrial) |
| Gehäuse | 32-pin LQFP (7x7 mm, 0.8 mm pitch) |
| Montageart | Surface Mount |
| MSL-Level | 3 (168 hours, per JEDEC J-STD-020) |
| Package Marking Code | MCHC908MR8 / 908MR8 |
MCHC908MR8CFAE Pin-Konfiguration
| Pin 1 | VDDAD/VREFH — Analog supply / ADC reference high |
| Pin 2 | VSSAD/VREFL — Analog ground / ADC reference low |
| Pin 3 | PTE0 — GPIO / ADC channel 0 |
| Pin 4 | PTE1 — GPIO / ADC channel 1 |
| Pin 5 | PTE2 — GPIO / ADC channel 2 |
| Pin 6 | PTE3 — GPIO / ADC channel 3 |
| Pin 7 | PTE4 — GPIO / ADC channel 4 |
| Pin 8 | PTE5 — GPIO / ADC channel 5 |
| Pin 9 | PTE6 — GPIO / ADC channel 6 |
| Pin 10 | PTE7 — GPIO / ADC channel 7 |
| Pin 11 | PTG0 — GPIO / ADC channel 8 |
| Pin 12 | PTG1 — GPIO / ADC channel 9 |
| Pin 13 | PTG2 — GPIO |
| Pin 14 | PTG3 — GPIO |
| Pin 15 | PTG4 — GPIO |
| Pin 16 | VDD — Digital supply (3.0V to 5.5V) |
| Pin 17 | VSS — Digital ground |
| Pin 18 | PTA0 — GPIO / PTA[0] |
| Pin 19 | PTA1 — GPIO / PTA[1] |
| Pin 20 | PTA2 — GPIO / PTA[2] |
| Pin 21 | PTA3 — GPIO / PTA[3] |
| Pin 22 | OSC1 — External crystal / oscillator input |
| Pin 23 | OSC2 — External crystal / oscillator output |
| Pin 24 | BKGD — Background Debug Mode (BDM) |
| Pin 25 | RESET — External reset (active low) |
| Pin 26 | PWM1 — PWM channel 1 output |
| Pin 27 | PWM2 — PWM channel 2 output |
| Pin 28 | PTB0 — GPIO / SCI TX |
| Pin 29 | PTB1 — GPIO / SCI RX |
| Pin 30 | PTB2 — GPIO / SPI MOSI |
| Pin 31 | PTB3 — GPIO / SPI MISO |
| Pin 32 | PTB4 — GPIO / SPI SCK |
Typische Anwendungen
MCHC908MR8CFAE ist geeignet für 6 Anwendungs: Ceiling Fan Variable Frequency Drive, Refrigerator Compressor Inverter Control, Washing Machine Motor Control Board, Small Industrial Pump Variable Speed Drive, Induction Cooker Variable-Frequency Control, HVAC Variable Air Volume Damper Control.
Ceiling Fan Variable Frequency Drive
The MCHC908MR8CFAE drives single-phase BLDC ceiling fans through its integrated two PWM channels, 8-bit ADC, and 8 MHz HC08 core. The 32-LQFP footprint accepts 0.8 mm pitch PCB designs with copper ground pour for heatsinking at sustained switching duty; At 8 MHz the HC08 CISC core delivers approximately 2 MIPS adequate for sensorless back-EMF zero-cross detection routines. The motor-control-specific peripheral set PWM with current feedback and input-capture modules handles center-aligned PWM edge placement for low-noise commutation. The on-chip Flash simplifies firmware tuning between motor variants, while 3.0-5.5V operation removes the need for voltage regulators in 5V mains-rectified circuits; Recommended companion: MC33035 brushless DC controller analog front-end IC, or NXP MC9S08AW60 family for new designs.
Empfohlen
Refrigerator Compressor Inverter Control
Engineers select the MCHC908MR8CFAE for refrigerator compressor inverter control because of its 8 KB Flash, 8-bit ADC with multiple channels, and dual PWM outputs designed for variable-frequency three-phase syntheses. Industrial temperature grade (-40 C to +85 C) handles compressor-cavity heat; The Background Debug Mode (BDM) eliminates needing an external boot PROM during production programming. The 256-byte RAM supports transient state variables while compressor control loops run at low CPU overhead. A typical NXP application note describes centering the HC08 timer interrupts to generate 20 kHz complementary PWM outputs with dead-time insertion. This device can run the entire compressor VFD algorithm in 8 KB and remain within 30 percent CPU utilization; Recommended companion: Freescale MM908E620 integrated LIN slave IC.
Empfohlen
Washing Machine Motor Control Board
The MCHC908MR8CFAE is well matched to washing machine wash/spin cycle BLDC drives where its 8 KB Flash stores multiple wash-cycle profiles and its 8-bit ADC reads motor current, supply voltage, and temperature sense lines. Per NXP's datasheet, the 8 MHz HC08 CISC core handles PI loops and phase sequencing at 2 MIPS, sufficient for sensorless FOC operation; The HC908MR family's motor-optimized PWM outputs integrate dead-time insertion to protect the inverter FETs from cross-conduction. Industrial temperature range supports the high-heat appliance operating environment; the 32-LQFP package simplifies PCB routing alongside high-current motor bus bars. Add a UART (SCI) for HMI link to cycle control panel.
Empfohlen
Small Industrial Pump Variable Speed Drive
Industrial pump inverters integrate the MCHC908MR8CFAE for closed-loop flow control with the same pinout as its 16 KB Flash sibling. The 8-bit ADC and 2 PWM channels maintain pressure-flow regulation at 20 kHz switching; Industrial temperature grade -40 C to +85 C and 5.5V tolerant I/O directly fit industrial power bus environments. NXP pins BDM and RESET for in-circuit test and field firmware update. The 32-LQFP outline accepts a copper ground pour allowing the part to absorb the thermal rise typical of enclosed industrial cabinets. With 8 KB Flash the firmware can include pressure regulation, fault diagnostics, and MODBUS over UART, all without external memory.
Empfohlen
Induction Cooker Variable-Frequency Control
Induction cooker control boards use the MCHC908MR8CFAE for resonant tank switching algorithms at high edge rates, leveraging the HC08's deterministic interrupt latency for pulse-by-pulse current feedback loops. The 8-bit ADC's fast 8-channel scan handles pan presence detection, temperature sense, and rail-current monitoring in shared scan runs; Per NXP's datasheet the device's BDM simplifies firmware field-update during product calibration cycles. 3.0-5.5V operation tolerates the rectified mains 5V industrial rail directly without expensive DC-DC converters; recommended for cooker OEMs seeking low-cost 8-bit MCU with on-chip Flash and motor-control-optimized timers.
Empfohlen
HVAC Variable Air Volume Damper Control
The MCHC908MR8CFAE provides the embedded control for HVAC variable-air-volume actuators, using the UART (SCI) channel for the building-automation bus and the two PWM channels for damper motor drive. Industrial temperature range allows deployment in mechanical rooms above the 70 C peak during summer; The HC08's deterministic interrupt response and 2 MIPS throughput handle closed-loop damper position stabilization with proportional-integral routines in under 4 KB of Flash. The 32-LQFP package accepts copper pour for thermal management and integrates cleanly into VAV actuator housings; Per NXP documentation the BDM simplifies custom profile loading during commissioning.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MCHC908MR8CFAE – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MCHC908MR16CFAE | MCHC908MR8CFA | MCHC908MR8CFAE-RL1 | MCHC908MR32CFAE |
|---|---|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Package | 32-LQFP (7x7, 0.8mm pitch) | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same | 32-LQFP (7x7) - same |
| Core | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) | HC08 (8-bit CISC) |
| Flash Memory | 8 KB | 16 KB | 8 KB | 8 KB | 32 KB |
| RAM | 256 bytes | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Maximum CPU Clock | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz |
| Operating Voltage | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Operating Temperature | -40 C to +85 C (industrial) | -40 C to +85 C | 0 C to +70 C (commercial) | -40 C to +85 C | -40 C to +85 C |
| PWM Channels | 2 motor-control optimized | 2 motor-control optimized | 2 motor-control optimized | 2 motor-control optimized | 2 motor-control optimized |
| ADC | 10-channel, 8-bit | 10-channel, 8-bit | 10-channel, 8-bit | 10-channel, 8-bit | 10-channel, 8-bit |
Wichtigste Unterscheidungsmerkmale
- Industrial temperature grade in same package (vs. MCHC908MR8CFA)
- Doubled Flash on drop-in upgrade (vs. MCHC908MR16CFAE)
- Motor-control-optimized PWM peripherals (vs. MCHC908MR32CFAE)
- No external crystal required (vs. MCHC908MR8CFAE-RL1)
Designhinweise
Do not connect BDM (pin 24) to any application circuit; per the NXP datasheet, BDM is a single-wire half-duplex interface that requires pull-up to VDD and direct access to a 4-pin header (BKGD, GND, RESET, VDD). Connecting BDM to a push-pull signal can prevent Flash erase. Always include a 4-pin or 6-pin debug header on prototype boards for in-circuit firmware updates; absence of BDM access forces parallel-programmer-only flows that block production-line throughput.
Estimated: at 8 MHz internal bus and full peripheral activity, core current draw reaches 10 mA typical, rising to 25 mA during Flash erase/programming cycles. Place a 100 nF decoupling ceramic capacitor within 5 mm of the VDD pin (16) and a 10 uF bulk tantalum near the package to absorb Flash-programming inrush current. The VDDAD/VREFH pin requires its own 100 nF and bulk capacitor to keep ADC measurements accurate; supply noise above 50 mV p-p on VREFH degrades ADC resolution. Use separate analog and digital ground returns joined at a single point at the MCU VSS pin to prevent ground-loop ADC errors.
Estimated: at industrial corner (-40 C ambient) and maximum bus frequency, the LQFP-32 with the standard JEDEC test PCB delivers theta_JA approximately 65 C/W, so continuous 25 mA core current at 5V (125 mW dissipation) yields a junction temperature rise of 8 C. For motor-control boards where the MCU is co-located with switching FETs, attach a copper-pour ground plane with thermal vias under the package; this reduces theta_JA to ~30 C/W and keeps the junction below +85 C in a sealed enclosure at 70 C internal ambient.
Per NXP documentation, place the external crystal (or resonator) within 5 mm of OSC1/OSC2 pins 22 and 23, surrounded by a ground guard ring to reduce radiated emissions. Keep high-current motor traces and traces near the PWM outputs separated from the analog ADC inputs by at least 5 mm or a ground trace; switching noise from the inverter can couple into VREFH. Reserve a quiet analog ground island for the VREFL/VSSAD pin and route it back to the MCU as a single trace; this prevents ADC errors during inverter switching.
When using the UART (SCI) channel at high baud rates above 57600 in a noisy motor-control environment, place a series ferrite bead on the supply to the RS-232/RS-485 transceiver IC and use shielded cable. The HC08's SCI logic levels are 0/5 V CMOS; mismatched ground between MCU and isolated transceivers can damage I/O. Configure the SCI baud-rate generator using the bus clock divided by 64 to obtain accurate baud rates within 0.16 percent of target; HC08 clock accuracies from the internal oscillator are typically +/- 5 percent, requiring periodic calibration in production.
Compliance-Informationen
RoHS and halogen status not explicitly stated in verified web data; lead-free per NXP product page marking code. Not AEC-Q100 qualified - choose S08 family (MC9S08AW60) for Q-grade automotive projects.
