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NXP Semiconductors MCHC908QT2MDWE
- Part No.:
- MCHC908QT2MDWE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MCHC908QT2MDWE.pdf
- Description:
- IC MCU 8BIT 1.5KB FLASH 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,014
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Product details
Overview
MCHC908QT2MDWE from NXP Semiconductors (formerly Freescale) is an 8-bit HCS08-core microcontroller with 2 KB on-chip FLASH, 128 B RAM, and integrated 8-channel 8-bit ADC. It operates at up to 8 MHz bus frequency using an internal trimmed RC oscillator and supports STOP/WAIT low-power modes. Used in cost-sensitive embedded control applications such as appliance motor interfaces and sensor signal conditioning.
For engineers reviewing the MCHC908QT2MDWE datasheet, MCHC908QT2MDWE pinout, MCHC908QT2MDWE application, or MCHC908QT2MDWE equivalent, key selection criteria include its 16-pin SOIC-W package, 5 V operation, on-chip COP watchdog, keyboard interrupt capability, and lack of UART or SPI peripherals - requiring external serial interface if needed.
Technical Context
The MCHC908QT2MDWE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing. Its memory map includes 2 KB FLASH (with block protection), 128 B RAM, and 32 B EEPROM-equivalent data storage via FLASH emulation.
Peripheral integration includes an 8-channel 8-bit ADC with software-selectable conversion clock prescaler, a 16-bit TIM module with input capture/output compare, KBI for matrix keypad scanning, AWU for periodic wake-up from STOP mode, and LVI for brown-out detection at 3.8 V nominal trip point.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 32-instruction set extensions |
| FLASH Memory | 2 KB on-chip FLASH with page erase, mass erase, and block protection register |
| RAM Size | 128 bytes of on-chip RAM for stack, variables, and temporary data storage |
| ADC Resolution | 8-bit successive approximation ADC with 8 selectable input channels and 12.5 µs typical conversion time |
| Operating Voltage | 4.5 V to 5.5 V - compatible with standard TTL/CMOS logic and industrial 5 V rails |
| Max Bus Frequency | 8 MHz - derived from internal RC oscillator (±2% typical after trimming) or external crystal |
| Low-Power Modes | STOP (0.5 µA typical) and WAIT (10 µA typical) modes supported with wake-up via IRQ, KBI, or AWU |
Pinout & Package
Package: 16-pin SOIC-W (Wide-body), 7.5 mm width, 1.27 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 5 V supply input; decoupling capacitor required near pin |
| VSS | Ground | Digital ground reference for all I/O and core logic |
| XTAL | Crystal input | Connects to one terminal of external 32.768 kHz or 1–8 MHz crystal |
| EXTAL | Crystal output / external clock input | Drives crystal second terminal or accepts external clock source |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit port with individual direction control; PTA0–PTA3 support KBI inputs |
| IRQ | External interrupt request | Active-low edge-triggered interrupt input with configurable polarity |
| RESET | Active-low reset input | Hardware reset assertion; internal pull-up enabled during normal operation |
| OSC1/OSC2 | Oscillator amplifier pins | Support external crystal or ceramic resonator; internal RC oscillator used when unconnected |
Key Features
| Feature | Design Value |
|---|---|
| On-chip COP watchdog | Configurable timeout (0.5 ms to 1.0 s) with dedicated COPCTL register and automatic reset on timeout |
| Keyboard interrupt (KBI) | Scans up to 8 keys across PTA0–PTA3 with debouncing support and wake-from-STOP capability |
| Auto wake-up module (AWU) | Generates periodic interrupts from STOP mode using internal RC clock; programmable interval from 16 ms to 4 s |
| Low-voltage inhibit (LVI) | Monitors VDD and asserts reset if voltage drops below 3.8 V ±0.2 V; hysteresis prevents chatter |
| FLASH block protection | FLBPR register enables write/erase protection for top 256-byte FLASH block containing reset vector |
Applications
| Home Appliance Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Microcontroller in washing machine control panel managing motor sequencing, water valve timing, and LED display. IC Role / Device Role / Timing Role: Primary system controller executing state-machine logic, reading front-panel buttons via KBI, and driving relay outputs through GPIO. Use Value: Integrated KBI and AWU reduce external components; 2 KB FLASH accommodates firmware with fault diagnostics and user interface logic. |
Use Scenario: Signal conditioning unit for analog temperature/humidity sensors in HVAC duct monitoring. IC Role / Device Role / Timing Role: ADC acquisition node converting sensor outputs to digital values, applying linear scaling, and transmitting via external UART. Use Value: 8-bit ADC with 8-channel multiplexing supports multi-sensor polling; LVI ensures reliable operation during power fluctuations. |
| Consumer Remote Control Hub | Power Tool Motor Controller |
Use Scenario: IR remote receiver hub consolidating commands from multiple remotes into unified control signals for AV equipment. IC Role / Device Role / Timing Role: Input processor decoding NEC/RC5 protocols via GPIO timing, storing command history in RAM, and triggering actions via GPIO outputs. Use Value: STOP-mode current <1 µA enables battery operation for months; internal oscillator eliminates need for external crystal in cost-sensitive design. |
Use Scenario: Brushed DC motor speed controller in cordless drill with trigger-potentiometer feedback and thermal shutdown. IC Role / Device Role / Timing Role: Real-time PWM generation (via TIM OC), ADC sampling of pot and thermistor, and safety logic execution. Use Value: 8 MHz bus speed supports 10 kHz PWM resolution; integrated COP prevents runaway motor conditions during firmware faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA2CSC | RS08 core, 2 KB FLASH, 128 B RAM, no KBI, no AWU, but adds UART and I²C | Lacks keyboard scan hardware; requires software bit-banging for keypad; better for serial communication–centric designs | Select when UART/I²C connectivity is mandatory and keypad interface is implemented externally or via GPIO polling |
| STM8S003F3P6 | STM8 core, 8 KB FLASH, 1 KB RAM, 10-bit ADC, built-in UART/SPI/I²C, 3.3 V only | Higher performance and richer peripherals, but incompatible voltage domain and toolchain | Choose for designs needing higher code capacity, precision ADC, or native serial interfaces - with 3.3 V system redesign |
Compared with MC9RS08KA2CSC and STM8S003F3P6, the MCHC908QT2MDWE offers optimized cost and power for simple 5 V control tasks with built-in KBI and AWU, while lacking serial interfaces - making it ideal for standalone, low-BOM-count applications where those features are unnecessary.
Availability
MCHC908QT2MDWE is available at Aetrix Electronics and suitable for home appliance control, industrial sensor interface, consumer remote control hub, and power tool motor controller applications requiring stable component supply and long-term industrial availability.
Supply support for MCHC908QT2MDWE 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
NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips' semiconductor division, now specializing in secure connectivity solutions and MCU platforms for automotive, industrial, and IoT markets.
The MCHC908QT2MDWE belongs to the legacy HCS08 family designed for cost-effective, low-power 8-bit embedded control in appliances, tools, and instrumentation - emphasizing minimal external components and robust operation in noisy environments.
FAQ
What is the maximum operating frequency of the MCHC908QT2MDWE?
The MCHC908QT2MDWE supports a maximum bus frequency of 8 MHz. This is achieved either by trimming the internal RC oscillator (±2% typical accuracy) or by connecting an external crystal up to 8 MHz. The CPU executes instructions at bus frequency, enabling real-time response in motor control and sensor readout applications. The MCHC908QT2MDWE does not support PLL-based frequency multiplication.
Does the MCHC908QT2MDWE include a hardware UART or SPI interface?
No, the MCHC908QT2MDWE does not include a hardware UART, SPI, or I²C peripheral. Communication must be implemented via bit-banged GPIO or external level-shifting transceivers. This omission reflects its design focus on minimal-cost, self-contained control functions - such as keypad scanning and ADC-based sensing - where serial interfaces are handled by companion ICs or omitted entirely. The MCHC908QT2MDWE relies on its KBI, TIM, and ADC for primary I/O tasks.
How is the MCHC908QT2MDWE programmed and debugged?
The MCHC908QT2MDWE supports background debug mode (BDM) via a single-wire interface using the BKGD pin. Programming and debugging require a compatible BDM pod (e.g., P&E Multilink) and CodeWarrior or S08 IDE. FLASH programming is performed in-circuit without removing the device; the MCHC908QT2MDWE does not support ISP via UART or bootloader-based updates. Debugging includes full register visibility, breakpoint support, and memory inspection.
What low-power modes does the MCHC908QT2MDWE support, and how low is the current draw?
The MCHC908QT2MDWE supports two ultra-low-power modes: WAIT (10 µA typical at 5 V) and STOP (0.5 µA typical). In STOP mode, the CPU, FLASH, and most peripherals halt while RAM contents and certain registers retain state. Wake-up sources include IRQ, KBI, and AWU - enabling battery-powered operation for months. The MCHC908QT2MDWE's LVI circuit remains active in STOP mode to ensure safe restart after brown-out recovery.
Is the MCHC908QT2MDWE pin-compatible with other members of the QY/QT family?
Yes, the MCHC908QT2MDWE is pin-compatible with MC68HC908QT1 and MC68HC908QT4 in the same 16-pin SOIC-W package. Differences lie in FLASH size (1 KB, 2 KB, 4 KB), RAM (64 B, 128 B, 256 B), and peripheral enablement - but pin assignments, electrical characteristics, and register maps remain identical. Firmware written for MCHC908QT2MDWE can run on QT4 without modification, provided it stays within the smaller memory footprint of QT2.
MCHC908QT2MDWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- -
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 5
- Program Memory Size:
- 1.5KB (1.5K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- A/D 4x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCHC908QT2MDWE FAQ
1.How can I place an order for MCHC908QT2MDWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHC908QT2MDWE 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 MCHC908QT2MDWE reliable?
The price and inventory of MCHC908QT2MDWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHC908QT2MDWE is usually 5 days.
3.What payment methods are accepted for MCHC908QT2MDWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHC908QT2MDWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHC908QT2MDWE?
MCHC908QT2MDWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHC908QT2MDWE 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 MCHC908QT2MDWE?
For technical support, including MCHC908QT2MDWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHC908QT2MDWE requirements.
6.How does Aetrix verify that MCHC908QT2MDWE is sourced from the original manufacturer or authorized distributors?
All MCHC908QT2MDWE 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 MCHC908QT2MDWE meets industry standards.
7.What is the process for return or replacement of MCHC908QT2MDWE?
All MCHC908QT2MDWE units undergo pre-shipment inspection (PSI). If there is an issue with MCHC908QT2MDWE, 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 MCHC908QT2MDWE part is unused and in its original packaging.
Return procedure for MCHC908QT2MDWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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