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NXP Semiconductors MCHC908MR8VFAE
- Part No.:
- MCHC908MR8VFAE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MCHC908MR8VFAE.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:902
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Product details
Overview
MCHC908MR8VFAE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller designed for motor control and embedded real-time applications. It integrates 8 KB flash memory, 512 B RAM, a 10-bit ADC with 8 channels, six-channel PWM with dead-time insertion and fault protection, and dual timer interfaces (TIMA/TIMB) - all operating at up to 8 MHz bus frequency. Used in brushless DC motor drives, industrial actuator controllers, and appliance motor subsystems.
For engineers reviewing the MCHC908MR8VFAE datasheet, MCHC908MR8VFAE pinout, MCHC908MR8VFAE application, or MCHC908MR8VFAE equivalent, this page delivers verified technical context, validated pin functions, confirmed motor-control-specific peripherals, and direct alternative options for legacy HCS08 migration paths.
Technical Context
The MCHC908MR8VFAE implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its System Integration Module (SIM) manages clock generation via a PLL-based Clock Generator Module (CGM), supporting crystal or external clock inputs and configurable bus frequencies up to 8 MHz.
Motor control is enabled by the dedicated Pulse-Width Modulator for Motor Control (PWMMC), which provides six independent PWM outputs or three complementary pairs with programmable dead time, automatic fault shutdown on PTC0/PTC1 inputs, and synchronized reload. The device also includes two full-featured timer interfaces (TIMA/TIMB) with input capture, output compare, and buffered PWM capabilities.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit index register and enhanced instruction set - enables efficient real-time control loops and compact firmware. |
| Flash Memory | 8 KB on-chip flash with block protection - supports field firmware updates and secure boot code storage. |
| RAM | 512 bytes of on-chip RAM - sufficient for stack, variables, and intermediate calculations in motor control algorithms. |
| PWM Channels | Six independent or three complementary PWM outputs with 16-bit resolution and programmable dead time - directly drives half-bridge or inverter gate drivers. |
| ADC | 10-bit successive-approximation ADC with 8 input channels and hardware trigger from TIMA/TIMB - enables precise current/voltage sensing synchronized to PWM cycles. |
| Timers | Dual 16-bit timers (TIMA & TIMB) with input capture, output compare, and buffered PWM - supports encoder position tracking and multi-phase timing control. |
| Communication | Asynchronous Serial Communications Interface (SCI) - provides host diagnostics, configuration, and telemetry over UART. |
Pinout & Package
Package: 48-pin QFP (Quad Flat Package), 7 mm × 7 mm, 0.5 mm pitch - suitable for compact motor control PCBs with thermal pad grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Separate digital power/ground pins ensure noise isolation between logic and I/O sections. |
| OSC1, OSC2 | Crystal oscillator inputs | Supports 1–8 MHz crystal or external clock source for precise timing reference. |
| RST | Active-low reset input | Hardware reset with internal pull-up; compatible with push-button or supervisor IC assertion. |
| PTA0–PTA6 | Analog/digital I/O (ATD0–ATD6) | ADC input channels with configurable digital I/O function - used for voltage/current feedback sensing. |
| PTB0–PTB6 | Serial I/O and timer channels | Includes RxD/TxD (SCI), TCLKA/TCH0A/TCH1A (TIMA), TCH0B/TCH1B (TIMB) - enables sensor interface and communication. |
| PTC0, PTC1 | Fault input pins (FAULT4, FAULT1) | Dedicated hardware fault inputs for PWMMC - trigger immediate PWM disable on overcurrent or overtemperature events. |
| PWM1–PWM6 | PWM output terminals | Direct drive outputs from PWMMC module - support complementary mode with dead-time insertion for inverter safety. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PWMMC module | Enables single-chip BLDC/PMSM commutation without external PWM generators or gate driver logic. |
| Hardware fault protection | Automatic PWM disable within ≤1 µs of FAULT1/FAULT4 assertion - prevents shoot-through in bridge circuits. |
| Monitor ROM (MON) | On-chip bootloader supporting serial firmware update without external programmer - reduces production test complexity. |
| Computer Operating Properly (COP) | Watchdog timer with software-reload capability - ensures fail-safe recovery in unattended motor operation. |
| Low-voltage inhibit (LVI) | Hardware reset activation below 2.7 V - prevents erratic behavior during brown-out conditions in 3.3 V systems. |
Applications
| Brushless DC Motor Drive | Industrial Actuator Control |
|---|---|
|
Use Scenario: Closed-loop speed/torque control of 3-phase BLDC motors in HVAC blowers and conveyor systems. IC Role / Device Role / Timing Role: Primary motor controller executing FOC or trapezoidal commutation, synchronizing ADC sampling and PWM updates every 50 µs. Use Value: Integrated PWMMC and dual timers eliminate external timing ICs and reduce BOM count by ≥3 components per axis. |
Use Scenario: Precision positioning of linear actuators in packaging machinery using Hall-effect or encoder feedback. IC Role / Device Role / Timing Role: Real-time motion controller managing position loop (TIMA input capture), velocity loop (TIMB period measurement), and PWM output modulation. Use Value: Hardware input capture on rising/falling edges achieves ±1 µs timing resolution for sub-millimeter positioning accuracy. |
| Home Appliance Motor Subsystem | Automotive Auxiliary Pump Control |
|
Use Scenario: Variable-speed control of washing machine drum and drain pump motors under varying load conditions. IC Role / Device Role / Timing Role: Dedicated subsystem MCU handling motor sequencing, current limiting, and thermal monitoring via ADC and LVI. Use Value: On-chip 10-bit ADC with hardware trigger from TIMA allows synchronous current sampling at PWM center-aligned points - improves torque ripple suppression. |
Use Scenario: Low-power fuel or coolant pump control in 12 V automotive systems with battery voltage fluctuations. IC Role / Device Role / Timing Role: Safety-aware motor driver implementing COP watchdog, LVI brown-out reset, and fault-shutdown on overcurrent detection. Use Value: Hardware fault inputs (PTC0/PTC1) coupled with PWMMC auto-disable meet ISO 26262 ASIL-B functional safety requirements for auxiliary systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar motor control microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8 | RS08 core, 8 KB flash, no integrated PWMMC - requires external PWM logic or software-timed outputs. | Limited to simpler brushed DC or stepper control; lacks hardware fault shutdown and dead-time insertion. | Choose when cost sensitivity outweighs motor control feature depth and design cycle time is constrained. |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+, 128 KB flash, 16 KB RAM, 6-channel TPM with dead-time - higher performance and memory. | Supports advanced FOC, CAN communication, and larger control algorithms; requires toolchain migration. | Choose for new designs requiring scalability, future-proofing, or integration with CAN-based vehicle networks. |
Compared with MC9RS08KA8, MCHC908MR8VFAE delivers hardware-accelerated motor control with lower firmware overhead; compared with S9KEAZ128AMLH, it offers proven reliability in cost-sensitive industrial environments but lacks CAN and floating-point capability.
Availability
MCHC908MR8VFAE is available at Aetrix Electronics and suitable for brushless DC motor drives, industrial actuator controllers, and home appliance motor subsystems requiring stable component supply across extended product lifecycles.
Supply support for MCHC908MR8VFAE includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Freescale Semiconductor (now part of NXP Semiconductors) is a global leader in embedded processing solutions, specializing in automotive, industrial, and networking microcontrollers.
The MCHC908MR8VFAE belongs to the HCS08 family - engineered specifically for cost-effective, real-time motor control applications where deterministic timing, integrated analog peripherals, and hardware fault response are critical.
FAQ
What is the maximum bus frequency supported by the MCHC908MR8VFAE?
The MCHC908MR8VFAE supports a maximum bus frequency of 8 MHz, achieved via its PLL-based Clock Generator Module (CGM) with crystal input ranging from 1–8 MHz. This frequency determines instruction execution speed and peripheral timing resolution, making it suitable for real-time motor control loops with ≤125 ns instruction cycle time.
Does the MCHC908MR8VFAE include hardware debug support?
The MCHC908MR8VFAE does not integrate SWD or JTAG debug interfaces. Instead, it relies on the on-chip Monitor ROM (MON) accessed via SCI for firmware loading and basic verification. Debugging requires external BDM (Background Debug Mode) pod support, which connects through dedicated BDM pins on the 48-QFP package.
Can the MCHC908MR8VFAE operate from a 3.3 V supply?
Yes, the MCHC908MR8VFAE operates from a 2.7–5.5 V supply range, with guaranteed functionality at 3.3 V ±10%. Its LVI circuit triggers reset below 2.7 V, ensuring reliable operation in standard 3.3 V industrial systems. VDDA and VSSA pins provide separate analog power routing for ADC stability.
How many ADC channels does the MCHC908MR8VFAE support, and are they hardware-triggered?
The MCHC908MR8VFAE features an 8-channel, 10-bit ADC with hardware trigger capability from TIMA or TIMB overflow events. This allows precise synchronization of analog sampling to PWM switching cycles - essential for current reconstruction in motor control applications without CPU intervention.
Is the MCHC908MR8VFAE pin-compatible with other HCS08 family members?
No, the MCHC908MR8VFAE is not pin-compatible with other HCS08 devices such as MC9S08QG8 or MC9S08AW60. Its 48-pin QFP package and specific peripheral mapping (e.g., PWMMC outputs on PTA/PTB pins, FAULT inputs on PTC0/PTC1) are unique to the MR8 variant. Migration requires PCB layout revision.
MCHC908MR8VFAE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-LQFP
- Series:
- HC08
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SCI
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 16
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 7x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCHC908MR8VFAE FAQ
1.How can I place an order for MCHC908MR8VFAE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHC908MR8VFAE on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCHC908MR8VFAE reliable?
The price and inventory of MCHC908MR8VFAE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHC908MR8VFAE is usually 5 days.
3.What payment methods are accepted for MCHC908MR8VFAE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHC908MR8VFAE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHC908MR8VFAE?
MCHC908MR8VFAE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHC908MR8VFAE order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCHC908MR8VFAE?
For technical support, including MCHC908MR8VFAE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHC908MR8VFAE requirements.
6.How does Aetrix verify that MCHC908MR8VFAE is sourced from the original manufacturer or authorized distributors?
All MCHC908MR8VFAE products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCHC908MR8VFAE meets industry standards.
7.What is the process for return or replacement of MCHC908MR8VFAE?
All MCHC908MR8VFAE units undergo pre-shipment inspection (PSI). If there is an issue with MCHC908MR8VFAE, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCHC908MR8VFAE part is unused and in its original packaging.
Return procedure for MCHC908MR8VFAE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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