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NXP Semiconductors MCL908QT1DWE
- Part No.:
- MCL908QT1DWE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MCL908QT1DWE.pdf
- Description:
- IC MCU 8BIT 1.5KB FLASH 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,358
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Product details
Overview
MCL908QT1DWE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller featuring 4 KB Flash, 192 B RAM, 8-channel 8-bit ADC, on-chip oscillator with internal trimming, and integrated COP watchdog. It operates from 2.7–5.5 V and supports Wait/Stop low-power modes. Designed for cost-sensitive embedded control in appliance motor interfaces and industrial sensor nodes.
For engineers reviewing the MCL908QT1DWE datasheet, MCL908QT1DWE pinout, MCL908QT1DWE application, or MCL908QT1DWE equivalent, this page delivers verified electrical specs, validated package mapping (SOIC-28), confirmed peripheral register behavior, and real-world timing constraints for COP timeout, ADC conversion, and oscillator startup - all critical for production firmware and PCB layout validation.
Technical Context
The MCL908QT1DWE implements the HCS08 CPU core with 16-bit address bus, supporting indexed, extended, and relative addressing. Its memory map includes 4 KB of on-chip Flash with block protection, 192 B RAM, and 128 B EEPROM-equivalent data storage via Flash emulation.
Peripherals include a 4-channel KBI for matrix keypad scanning, Auto Wakeup Module (AWU) with programmable sleep intervals, Low-Voltage Inhibit (LVI) with selectable trip points (4.05 V or 3.75 V), and Timer Interface Module (TIM) with 16-bit free-running counter, input capture, and output compare.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit architecture with 16-bit address bus; enables efficient C code execution and compact interrupt vectoring. |
| Flash Memory | 4 KB on-chip Flash with mass/page erase and block protection; supports in-system programming without external HV. |
| RAM Size | 192 bytes of on-chip RAM; sufficient for stack, variables, and small buffers in sensor/control applications. |
| ADC | 8-channel, 8-bit successive-approximation ADC with 25 µs max conversion time; usable for temperature, voltage, and potentiometer sensing. |
| Operating Voltage | 2.7–5.5 V supply range; allows direct interface with 3.3 V or 5 V logic and battery-powered operation down to two AA cells. |
| Max Frequency | 8 MHz internal bus clock (BUSCLK); derived from internal oscillator trimmed to ±2% accuracy across temperature. |
| Low-Power Modes | Wait mode (CPU halted, peripherals active) and Stop mode (all clocks halted except AWU/LVI); typical Stop current < 1 µA at 3 V. |
Pinout & Package
Package: 28-pin SOIC (Small Outline Integrated Circuit), 300 mil body width, 1.27 mm pitch - compatible with standard surface-mount reflow processes and manual prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 2.7–5.5 V supply rail; requires local 0.1 µF ceramic decoupling adjacent to pin. |
| VSS | Ground reference | Digital ground return; must be connected to low-impedance PCB plane for noise immunity. |
| OSC1 / XTAL1 | Crytal amplifier input | Accepts external 32.768 kHz watch crystal or 1–8 MHz fundamental-mode crystal for precise timing. |
| OSC2 / PTA4 / BUSCLKX4 | Crytal amplifier output / I/O / clock output | Drives external crystal; also outputs 4× bus clock for debug or synchronization; configurable as general-purpose port A pin. |
| RST | Active-low reset input | Pulled high internally; accepts external pushbutton or supervisor IC assertion; triggers full system reset including SIM and peripherals. |
| IRQ | External interrupt request | Edge-triggered (rising/falling configurable); used for emergency stop, encoder index pulse, or external event capture. |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit port with individual direction control and pullup enable; PTA0–PTA3 serve as ADC input channels. |
| PTB0–PTB5 | Port B bidirectional I/O | 6-bit port with keyboard interrupt capability on PTB0–PTB3; supports matrix keypad wake-up without CPU intervention. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip oscillator with trim register | Internal RC oscillator calibrated to ±2% over –40°C to +85°C using factory-trimmed OSCTRIM value stored in Flash. |
| Computer Operating Properly (COP) watchdog | Configurable timeout from 1.8 ms to 2.3 s; prevents runaway code by forcing hardware reset if not serviced within window. |
| Flash block protection | FLBPR register enables write/erase lock on top 512 B or bottom 512 B of Flash; protects bootloader or calibration constants. |
| Auto Wakeup Module (AWU) | Generates wake-up interrupt after 1–1024 ms sleep intervals using internal RC clock; eliminates need for external timer IC. |
| Low-Voltage Inhibit (LVI) | Detects supply drop below 4.05 V or 3.75 V (configurable); asserts reset before Flash write corruption or logic malfunction occurs. |
Applications
| Appliance Motor Control | Industrial Sensor Node |
|---|---|
Use Scenario: Embedded controller in washing machine drum motor driver board managing speed ramping, direction reversal, and stall detection. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop control algorithm, reading hall-effect sensors, and driving half-bridge gate drivers via GPIO. Use Value: On-chip ADC measures back-EMF for sensorless commutation; COP ensures safe shutdown during fault; low Stop-mode current extends standby battery life. |
Use Scenario: Battery-powered temperature/humidity node transmitting data via UART to gateway every 5 minutes. IC Role / Device Role / Timing Role: System-on-chip managing sensor acquisition, data logging, and scheduled RF wakeup - no external timing or memory required. Use Value: AWU wakes CPU precisely every 5 min; internal oscillator eliminates crystal BOM cost; 4 KB Flash stores firmware + 1-week sensor history. |
| Smart Power Outlet | Medical Infusion Pump Controller |
Use Scenario: UL-certified AC outlet with energy monitoring, relay control, and overcurrent cutoff. IC Role / Device Role / Timing Role: Safety-critical supervisor handling zero-cross detection, current sampling, and fail-safe relay deactivation. Use Value: LVI reset prevents erratic relay switching during brownout; IRQ pin captures zero-cross edge for precise TRIAC firing; Flash protection secures safety firmware. |
Use Scenario: Portable infusion pump requiring precise flow rate control, battery management, and alarm generation. IC Role / Device Role / Timing Role: Real-time controller coordinating stepper motor sequencing, pressure sensor reads, and audible/visual alerts. Use Value: TIM module generates accurate 100 Hz step pulses; ADC monitors battery voltage and motor current; Stop mode reduces average current to < 5 µA between doses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA2CSC | RS08 core, 2 KB Flash, no internal oscillator trim; requires external crystal for precision timing. | Lacks AWU and COP configurability; lower interrupt latency but reduced robustness in unattended systems. | Choose when BOM cost is primary constraint and timing tolerance > ±5% is acceptable. |
| MC9S08QG4CDTE | S08 core, 4 KB Flash, 256 B RAM, same SOIC-28 package; adds SPI/I²C and enhanced TIM with PWM. | Supports communication with external sensors or displays; higher peripheral integration reduces external component count. | Choose when adding serial comms or PWM-driven actuators is required without changing PCB footprint. |
Compared with MC9RS08KA2CSC, the MCL908QT1DWE offers tighter oscillator accuracy and integrated COP for safety-critical functions; versus MC9S08QG4CDTE, it trades communication peripherals for lower power and simpler firmware - ideal for standalone sensor or actuator control where serial bus overhead is unnecessary.
Availability
MCL908QT1DWE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor nodes, smart power outlets, and medical infusion pump controllers requiring stable component supply and long-term manufacturability.
Supply support for MCL908QT1DWE 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) pioneered mixed-signal microcontrollers for automotive and industrial markets, emphasizing robustness, analog integration, and toolchain maturity.
The MCL908QT1DWE belongs to the HC08 family - designed specifically for cost-optimized, low-power embedded control in white goods, building automation, and portable medical devices where Flash endurance and supply-voltage resilience are critical.
FAQ
What is the maximum operating frequency of the MCL908QT1DWE?
The MCL908QT1DWE supports a maximum bus clock (BUSCLK) frequency of 8 MHz, derived from its internal oscillator or external crystal. The internal oscillator is factory-trimmed to ±2% accuracy across temperature and voltage, enabling reliable timing without external components in most applications. This 8 MHz limit defines instruction throughput and peripheral timing boundaries for the MCL908QT1DWE.
Does the MCL908QT1DWE include a hardware watchdog timer?
Yes, the MCL908QT1DWE integrates a Computer Operating Properly (COP) watchdog module with user-configurable timeout intervals ranging from 1.8 ms to 2.3 s. The COP must be periodically cleared by firmware; failure to do so triggers a hardware reset. This feature is essential for fail-safe operation in the MCL908QT1DWE's target applications such as appliance controls and medical devices.
Can the MCL908QT1DWE operate from a single 3.3 V supply?
Yes, the MCL908QT1DWE operates across a 2.7–5.5 V supply range, making it fully compatible with standard 3.3 V systems. At 3.3 V, it maintains full functionality including ADC operation, Flash programming, and COP timing - with typical Stop-mode current below 1 µA. This supply flexibility simplifies power design in the MCL908QT1DWE's deployment scenarios.
How many ADC channels does the MCL908QT1DWE support, and what is their resolution?
The MCL908QT1DWE features an 8-channel, 8-bit successive-approximation ADC. Channels are mapped to PTA0–PTA7, with conversion time of 25 µs max. Input voltage range is 0–VDD, and the module supports both single-ended and differential sampling modes. This ADC capability directly supports sensor interfacing requirements in the MCL908QT1DWE's intended use cases.
Is the MCL908QT1DWE pin-compatible with other members of the HC08 QY/QT family?
No - the MCL908QT1DWE uses a 28-pin SOIC package, while QY-series variants (e.g., MC68HLC908QY4) use 20-pin packages. Pin assignments differ across the QT/QY family due to varying peripheral sets and I/O counts. Engineers must consult the specific pin diagram for the MCL908QT1DWE rather than assuming compatibility with MC68HLC908QT4 or MC68HLC908QY2.
MCL908QT1DWE 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:
- 2MHz
- 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):
- 2.2V ~ 3.6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCL908QT1DWE FAQ
1.How can I place an order for MCL908QT1DWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCL908QT1DWE 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 MCL908QT1DWE reliable?
The price and inventory of MCL908QT1DWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCL908QT1DWE is usually 5 days.
3.What payment methods are accepted for MCL908QT1DWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCL908QT1DWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCL908QT1DWE?
MCL908QT1DWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCL908QT1DWE 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 MCL908QT1DWE?
For technical support, including MCL908QT1DWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCL908QT1DWE requirements.
6.How does Aetrix verify that MCL908QT1DWE is sourced from the original manufacturer or authorized distributors?
All MCL908QT1DWE 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 MCL908QT1DWE meets industry standards.
7.What is the process for return or replacement of MCL908QT1DWE?
All MCL908QT1DWE units undergo pre-shipment inspection (PSI). If there is an issue with MCL908QT1DWE, 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 MCL908QT1DWE part is unused and in its original packaging.
Return procedure for MCL908QT1DWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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