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NXP Semiconductors MC68HC908QY1CDT
- Part No.:
- MC68HC908QY1CDT
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC68HC908QY1CDT.pdf
- Description:
- IC MCU 8BIT 1.5KB FLASH 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,486
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Product details
Overview
MC68HC908QY1CDT from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller in a 16-pin SOIC package, featuring 1 KB FLASH, 64 bytes RAM, 8-channel 8-bit ADC, on-chip internal oscillator (4 MHz nominal), and integrated KBI for keypad scanning - used in low-cost industrial control panels and appliance user interfaces.
For engineers reviewing the MC68HC908QY1CDT datasheet, MC68HC908QY1CDT pinout, MC68HC908QY1CDT application, or MC68HC908QY1CDT equivalent, key selection criteria include its 16-pin SOIC footprint, 1 KB FLASH with block protection, internal RC oscillator trim capability, keyboard interrupt support, and compatibility with legacy HC08 development tools and monitor mode debugging.
Technical Context
The MC68HC908QY1CDT implements the M68HC08 CPU core with 16-bit address bus, supporting WAIT/STOP low-power modes and a programmable COP watchdog timer. Its System Integration Module (SIM) manages reset sources, clock distribution, and interrupt prioritization across IRQ, KBI, ADC, and AWU modules.
It integrates an 8-channel single-ended ADC with configurable sample time and conversion trigger options, plus a Keyboard Interrupt Module (KBI) with edge-sensitive wake-up on up to 8 pins - both designed for deterministic real-time response in battery-powered or space-constrained embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC08 8-bit CISC core with 16-bit addressing; enables compact code size and deterministic interrupt latency for real-time control. |
| FLASH Memory | 1 KB on-chip FLASH with block protection register (FLBPR); supports in-system programming and secure firmware updates. |
| RAM | 64 bytes of on-chip RAM; sufficient for small state machines and sensor data buffering without external memory. |
| ADC | 8-channel 8-bit successive-approximation ADC with internal reference; delivers 100 kSPS max sampling rate for analog sensor interfacing. |
| Oscillator | Internal RC oscillator trimmed to ±2% accuracy at 4 MHz (VDD = 5 V); eliminates need for external crystal in cost-sensitive designs. |
| Package | 16-pin SOIC (Small Outline Integrated Circuit); industry-standard footprint compatible with automated PCB assembly. |
| Operating Voltage | 2.7–5.5 V supply range; supports direct connection to 3.3 V or 5 V logic rails without level-shifting. |
Pinout & Package
MC68HC908QY1CDT is housed in a 16-pin SOIC package (case 751BD-02), 7.5 mm × 10.3 mm body, 1.27 mm pitch. Pin assignments are validated per Rev. 6 datasheet Figure 1-2 and Table 1-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 2.7–5.5 V supply input; decoupling capacitor required near pin for stable operation. |
| VSS | Ground | Digital ground reference; must be connected to system GND plane with low-impedance path. |
| OSC1 / XTAL1 | Crystal amplifier input | Accepts external crystal (1–8 MHz) or ceramic resonator; unused when internal oscillator selected. |
| OSC2 / PTA4 / BUSCLKX4 | Crystal amplifier output / port A bit 4 / 4× bus clock | Drives crystal/resonator; also serves as general-purpose I/O or outputs 4× internal clock for timing diagnostics. |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit port with individual direction control; PTA0–PTA3 support KBI wake-up; PTA4 is multiplexed with OSC2. |
| PTB0–PTB3 | Port B bidirectional I/O | 4-bit port with pull-up enable; PTB0–PTB3 support IRQ interrupt inputs and AWU wake-up sources. |
| RESET | Active-low reset input | Asynchronous reset assertion clears CPU registers and initiates boot sequence; internal LVI provides power-on reset. |
| IRQ | External interrupt request | Edge-triggered interrupt input (MODE=0) or level-sensitive (MODE=1); configured via SIM register. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip FLASH with block protection | Enables field firmware updates while preventing accidental overwrite of bootloader or calibration data. |
| Keyboard Interrupt Module (KBI) | Supports matrix keypad scanning with hardware-debounced edge detection on up to 8 pins, reducing CPU overhead. |
| Auto Wakeup Module (AWU) | Generates periodic interrupts from STOP mode using internal RC oscillator, enabling ultra-low-power sleep intervals (16 ms to 2 s). |
| Low-Voltage Inhibit (LVI) | Monitors VDD and forces reset if voltage drops below 2.5 V (typical), ensuring reliable operation during brownout conditions. |
| Computer Operating Properly (COP) watchdog | Configurable timeout (0.5 ms to 1.0 s) with software-reset capability; prevents system lockup in unattended applications. |
Applications
| Industrial Control Panel | Home Appliance UI |
|---|---|
|
Use Scenario: Front-panel interface for HVAC controllers with push-button inputs and LED status indicators. IC Role / Device Role / Timing Role: MCU executing keypad scan, LED drive, and serial communication to main controller. Use Value: Integrated KBI and 8-bit ADC eliminate external scan logic and analog front-end components, reducing BOM count by ≥3 parts. |
Use Scenario: User interface module in microwave ovens handling timer, power level, and door-sensor monitoring. IC Role / Device Role / Timing Role: Real-time event handler managing button press debouncing, display update timing, and safety interlock checks. Use Value: Internal 4 MHz oscillator and LVI ensure consistent timing and safe shutdown during voltage dips - critical for UL/IEC compliance. |
| Smart Power Outlet | Medical Diagnostic Handset |
|
Use Scenario: Energy-monitoring outlet with current sensing, relay control, and Bluetooth LE interface. IC Role / Device Role / Timing Role: Sensor acquisition node performing ADC sampling, relay actuation, and wake-up scheduling. Use Value: AWU-driven periodic wake-up from STOP mode achieves average current <10 µA, extending battery life in portable variants. |
Use Scenario: Portable blood glucose meter with test-strip interface, LCD driver, and button navigation. IC Role / Device Role / Timing Role: Low-power data acquisition engine managing electrochemical signal conditioning and result calculation. Use Value: 1 KB FLASH accommodates calibrated algorithms and error-handling routines within a single-chip solution, avoiding external EEPROM. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908QY2CDT | 2 KB FLASH, same 16-pin SOIC package, identical peripheral set; higher memory enables larger firmware with USB or enhanced UI logic. | Suitable where firmware growth exceeds 1 KB or future feature expansion is anticipated. | Select MC68HC908QY2CDT when >1 KB code space is required without changing PCB layout. |
| MC9RS08KA2CP | Renesas RS08 core, 2 KB FLASH, 128 bytes RAM, 10-bit ADC, 20-pin TSSOP; newer architecture with lower active current (120 µA/MHz). | Better suited for new designs requiring longer battery life or higher ADC resolution; requires PCB redesign. | Choose MC9RS08KA2CP for next-generation products needing improved power efficiency or resolution, accepting layout change. |
Compared with MC68HC908QY2CDT and MC9RS08KA2CP, the MC68HC908QY1CDT offers lowest BOM cost and drop-in replacement for existing QY1-based designs, while trading off memory headroom and modern power optimization - ideal for cost-locked, volume-manufactured legacy upgrades.
Availability
MC68HC908QY1CDT is available at Aetrix Electronics and suitable for industrial control panels, home appliance user interfaces, and smart power outlets requiring stable component supply and long-term obsolescence management.
Supply support for MC68HC908QY1CDT 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The MC68HC908QY1CDT belongs to the legacy HCS08 microcontroller family, designed for cost-sensitive, low-pin-count embedded control applications requiring robustness, debuggability, and long product lifecycles.
FAQ
What is the maximum operating frequency of the MC68HC908QY1CDT?
The MC68HC908QY1CDT operates with a maximum bus clock frequency of 8 MHz, derived from its internal 4 MHz RC oscillator doubled via the BUSCLKX2 output. External crystal configurations support up to 8 MHz directly. This frequency defines instruction execution speed and peripheral timing limits - for example, ADC conversion time scales linearly with bus clock, requiring design validation at 8 MHz for worst-case timing margins.
Does the MC68HC908QY1CDT support in-circuit debugging?
Yes, the MC68HC908QY1CDT supports monitor mode debugging via the BKGD pin using standard Freescale HCS08 debug interfaces. It enables non-intrusive read/write access to memory and registers, breakpoint insertion, and single-stepping without dedicated JTAG hardware - essential for rapid firmware validation in resource-constrained development environments.
How is FLASH memory protected against accidental erasure on the MC68HC908QY1CDT?
FLASH protection on the MC68HC908QY1CDT is managed by the FLASH Block Protect Register (FLBPR) at address $FFBE. Writing specific unlock sequences followed by FLBPR configuration prevents unintended program/erase operations - protecting bootloader sections or calibration constants. Protection is retained after reset and persists across power cycles when enabled.
Can the MC68HC908QY1CDT operate from a 3.3 V supply?
Yes, the MC68HC908QY1CDT supports 2.7–5.5 V operation, making it fully compatible with 3.3 V systems. At 3.3 V, the internal oscillator runs at ~3.3 MHz (±5% untrimmed, ±2% trimmed), and all I/O pins are 5 V tolerant - allowing direct interfacing with both 3.3 V and 5 V peripherals without level shifters.
What peripheral modules are included in the MC68HC908QY1CDT?
The MC68HC908QY1CDT integrates an 8-channel 8-bit ADC, Keyboard Interrupt Module (KBI), Auto Wakeup Module (AWU), Computer Operating Properly (COP) watchdog, Low-Voltage Inhibit (LVI), and System Integration Module (SIM). These peripherals collectively support sensor acquisition, human interface, low-power scheduling, system safety, and interrupt management - all without external support ICs.
MC68HC908QY1CDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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:
- 13
- 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:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908QY1CDT FAQ
1.How can I place an order for MC68HC908QY1CDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908QY1CDT 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 MC68HC908QY1CDT reliable?
The price and inventory of MC68HC908QY1CDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908QY1CDT is usually 5 days.
3.What payment methods are accepted for MC68HC908QY1CDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908QY1CDT transactions.
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4.How is shipping managed for MC68HC908QY1CDT?
MC68HC908QY1CDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908QY1CDT 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 MC68HC908QY1CDT?
For technical support, including MC68HC908QY1CDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908QY1CDT requirements.
6.How does Aetrix verify that MC68HC908QY1CDT is sourced from the original manufacturer or authorized distributors?
All MC68HC908QY1CDT 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 MC68HC908QY1CDT meets industry standards.
7.What is the process for return or replacement of MC68HC908QY1CDT?
All MC68HC908QY1CDT units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908QY1CDT, 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 MC68HC908QY1CDT part is unused and in its original packaging.
Return procedure for MC68HC908QY1CDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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