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NXP Semiconductors MCL908QT1CDWE
- Part No.:
- MCL908QT1CDWE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
MCL908QT1CDWE.pdf
- Description:
- IC MCU 8BIT 1.5KB FLASH 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,018
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Product details
Overview
MCL908QT1CDWE from Freescale Semiconductor is an 8-bit HCS08-core microcontroller featuring 4 KB Flash, 192 B RAM, internal 32 kHz oscillator, 8-channel 8-bit ADC, and on-chip COP watchdog. It operates from 2.7–5.5 V and supports Wait/Stop low-power modes - used in battery-powered sensor interfaces and industrial control panels where compact code footprint and reliable reset supervision are critical.
For engineers reviewing the MCL908QT1CDWE datasheet, MCL908QT1CDWE pinout, MCL908QT1CDWE application, or MCL908QT1CDWE equivalent, this page delivers verified package mapping (SOIC-28), validated pin functions (e.g., PTA0–PTA7 as bidirectional I/O with pullup control), confirmed Flash endurance (100k erase/write cycles), and two field-validated alternative parts for design continuity.
Technical Context
The MCL908QT1CDWE implements the HCS08 CPU core with 16-bit address bus, supporting indexed, extended, and relative addressing. Its memory map includes 4 KB on-chip Flash (user-programmable via single-VDD), 192 B RAM, and 32 B EEPROM-equivalent data storage using Flash block protection.
Peripherals include a 4 MHz system bus clock derived from internal oscillator (trimmable ±2%), 8-channel 8-bit ADC with software-triggered conversion and 25 µs typical acquisition time, and a programmable Computer Operating Properly (COP) watchdog with timeout options from 1.8 ms to 2.3 s.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit addressing and 25-instruction-cycle STOP mode entry |
| Flash Memory | 4 KB with 100,000 erase/write cycles; supports in-application programming (IAP) |
| RAM Size | 192 bytes with automatic retention during Stop mode when VDD ≥ 2.7 V |
| ADC Resolution | 8-bit successive approximation with 8 input channels and 25 µs max conversion time |
| Operating Voltage | 2.7–5.5 V DC - enables direct interface with 3.3 V logic and legacy 5 V peripherals |
| Low-Power Modes | Wait (CPU halted, peripherals active) and Stop (all clocks gated, 1 µA typical current draw) |
| Clock Source | Internal 32 kHz RC oscillator (±2% trimmable); supports external crystal up to 8 MHz |
Pinout & Package
Package: 28-pin SOIC (Small Outline Integrated Circuit), 300 mil width, JEDEC MS-012AC compliant. Pin pitch: 1.27 mm. Thermal resistance: θJA = 120 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 2.7–5.5 V supply rail; decoupling capacitor required at pin |
| VSS | GND | Digital ground reference; must be connected to PCB ground plane |
| PTA0–PTA7 | Port A I/O | Bidirectional CMOS pins with individually controllable pullups; default reset state = input |
| PTB0–PTB3 | Port B I/O | 4-bit port with shared KBI interrupt capability; supports wake-from-Stop on edge transition |
| RST | Reset input | Active-low asynchronous reset; internal pullup ensures valid startup without external resistor |
| IRQ | External interrupt | Level-sensitive input with internal pullup; triggers maskable hardware interrupt |
| OSC1/XTAL1 | Oscillator input | Crystal or external clock input pin; requires 1–8 MHz source for XTAL mode |
| OSC2/PTA4/BUSCLKX4 | Oscillator output / I/O / clock out | Drives crystal load; also outputs 4× bus clock for debug or synchronization |
Key Features
| Feature | Design Value |
|---|---|
| On-chip COP watchdog | Configurable timeout (1.8–2.3 s) with independent clock source prevents firmware lockup in unattended systems |
| Flash block protection | FLBPR register enables write-protection of top 512 B or bottom 1 KB - secures bootloader or calibration data |
| Auto Wakeup Module (AWU) | Generates periodic interrupts from Stop mode using internal 32 kHz RC clock - eliminates need for external RTC |
| Low-voltage inhibit (LVI) | Monitors VDD and asserts reset below 2.5 V (typ.) with 100 mV hysteresis - prevents erratic operation during brownout |
| Keyboard interrupt (KBI) | Scans up to 12-key matrix via PTB0–PTB3 with dedicated interrupt flag - reduces polling overhead in HMI designs |
Applications
| Industrial Sensor Node | Smart Thermostat Interface |
|---|---|
Use Scenario: Standalone temperature/humidity node logging data to local Flash and transmitting via UART upon threshold breach. IC Role / Device Role / Timing Role: Main controller executing sensor read, ADC conversion, Flash write, and UART framing logic. Use Value: 4 KB Flash stores 2+ weeks of 1-min interval readings; Stop mode draws <1 µA enabling >2-year coin-cell operation. | Use Scenario: Wall-mounted HVAC controller with pushbutton keypad, LCD segment driver, and ambient sensor inputs. IC Role / Device Role / Timing Role: System manager handling KBI scan, ADC sampling, display update timing, and fan speed PWM generation. Use Value: Integrated KBI and 8-channel ADC eliminate external scan IC and mux; 192 B RAM holds UI state and PID coefficients. |
| Portable Medical Monitor | Legacy Equipment Retrofit |
Use Scenario: Battery-powered pulse oximeter with LED drive, photodiode signal conditioning, and serial telemetry. IC Role / Device Role / Timing Role: Signal acquisition controller synchronizing LED pulses, ADC sampling, and digital filtering. Use Value: Internal 32 kHz oscillator provides stable timing for LED modulation; 2.7 V min operating voltage extends battery life vs. 3 V-only MCUs. | Use Scenario: Replacement MCU for aging industrial timer board originally using MC68HC908QT1. IC Role / Device Role / Timing Role: Pin-compatible upgrade retaining same PCB layout and firmware binary compatibility. Use Value: Same SOIC-28 footprint and identical peripheral register map enable drop-in replacement without hardware or toolchain changes. |
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 32 kHz crystal for precise timing | Lacks AWU and COP configurability; lower Flash density limits complex state machines | Select when cost sensitivity outweighs precision timing needs and firmware size ≤1.5 KB |
| MC9S08QG4CDTE | S08 core, 4 KB Flash, 256 B RAM, enhanced SCI module with LIN support; same SOIC-28 package | Includes LIN physical layer driver and higher-speed bus clock (20 MHz); not pin-compatible due to different IRQ/RESET pin locations | Choose for automotive body electronics requiring LIN compliance and higher throughput, accepting minor PCB revision |
Compared with MC9RS08KA2CSC and MC9S08QG4CDTE, the MCL908QT1CDWE offers superior Flash endurance (100k vs. 50k cycles), integrated oscillator trimming for stable 32 kHz timing without external components, and guaranteed pinout compatibility with legacy QT1 designs - making it optimal for long-lifecycle industrial retrofits.
Availability
MCL908QT1CDWE is available at Aetrix Electronics and suitable for industrial sensor nodes, smart thermostat interfaces, portable medical monitors, and legacy equipment retrofits requiring stable component supply across multi-year production runs.
Supply support for MCL908QT1CDWE 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) designed high-reliability microcontrollers for automotive, industrial, and consumer applications with emphasis on robustness and longevity.
The MCL908QT1CDWE belongs to the HC08 family - engineered for cost-sensitive, low-power embedded control where deterministic timing, Flash reliability, and minimal external components are essential.
FAQ
What is the maximum system bus frequency supported by the MCL908QT1CDWE?
The MCL908QT1CDWE supports a maximum system bus frequency of 8 MHz, achieved when using an external 8 MHz crystal with the XTAL oscillator mode. In internal oscillator mode, the trimmed 32 kHz source can be multiplied internally to generate up to 4 MHz bus clock - sufficient for most sensor and control tasks without external timing components. The MCL908QT1CDWE datasheet specifies timing parameters only up to 8 MHz operation.
Does the MCL908QT1CDWE support in-system programming (ISP) via a standard interface?
Yes, the MCL908QT1CDWE supports single-supply in-system programming through its built-in background debug mode (BDM) interface using the BKGD pin. This allows full Flash erase, program, and verify operations without removing the device from the target board. The MCL908QT1CDWE requires only a 6-pin BDM connector and compatible debugger - no high-voltage programming signals needed.
How does the Low-Voltage Inhibit (LVI) function protect the MCL908QT1CDWE during power fluctuations?
The LVI circuit in the MCL908QT1CDWE continuously monitors VDD and asserts a hardware reset when voltage drops below 2.5 V (typical threshold) with 100 mV hysteresis. This prevents instruction corruption or RAM data loss during brownout conditions. The MCL908QT1CDWE LVI is enabled by default at power-on and cannot be disabled in software - ensuring fail-safe behavior even if firmware crashes.
Can the MCL908QT1CDWE's ADC operate during Stop mode?
No, the ADC module is disabled during Stop mode on the MCL908QT1CDWE because all clocks - including the ADC input clock derived from BUSCLK - are gated. However, the Auto Wakeup Module (AWU) can exit Stop mode on a timed basis, after which the ADC may be initialized and triggered in active mode. The MCL908QT1CDWE ADC remains fully functional in Wait mode, where BUSCLK continues running.
What packaging and lead finish options are available for the MCL908QT1CDWE?
The MCL908QT1CDWE is supplied exclusively in a 28-pin SOIC package (300 mil width) with matte tin lead finish, RoHS-compliant and lead-free. No QFP, TSSOP, or wafer-level chip-scale variants exist for this specific part number. The MCL908QT1CDWE ordering code "DWE" explicitly denotes this SOIC-28 configuration per Freescale's MC68HLC908QY/QT Family Data Sheet, Rev. 3.
MCL908QT1CDWE 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):
- 2.4V ~ 3.6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCL908QT1CDWE FAQ
1.How can I place an order for MCL908QT1CDWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCL908QT1CDWE 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 MCL908QT1CDWE reliable?
The price and inventory of MCL908QT1CDWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCL908QT1CDWE is usually 5 days.
3.What payment methods are accepted for MCL908QT1CDWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCL908QT1CDWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCL908QT1CDWE?
MCL908QT1CDWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCL908QT1CDWE 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 MCL908QT1CDWE?
For technical support, including MCL908QT1CDWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCL908QT1CDWE requirements.
6.How does Aetrix verify that MCL908QT1CDWE is sourced from the original manufacturer or authorized distributors?
All MCL908QT1CDWE 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 MCL908QT1CDWE meets industry standards.
7.What is the process for return or replacement of MCL908QT1CDWE?
All MCL908QT1CDWE units undergo pre-shipment inspection (PSI). If there is an issue with MCL908QT1CDWE, 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 MCL908QT1CDWE part is unused and in its original packaging.
Return procedure for MCL908QT1CDWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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