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NXP Semiconductors MC68HC908QY4VDT
- Part No.:
- MC68HC908QY4VDT
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC68HC908QY4VDT.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,553
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Product details
Overview
MC68HC908QY4VDT from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 4 KB on-chip FLASH, 192 B RAM, and integrated 8-channel 8-bit ADC. It features a programmable internal oscillator (1–8 MHz), low-voltage inhibit (LVI), computer operating properly (COP) watchdog, and keyboard interrupt (KBI) module. Designed for cost-sensitive embedded control in appliance motor drives and industrial sensor interfaces.
For engineers reviewing the MC68HC908QY4VDT datasheet, MC68HC908QY4VDT pinout, MC68HC908QY4VDT application, or MC68HC908QY4VDT equivalent, key selection criteria include its 16-pin SOIC package, 5 V operation, internal RC oscillator trim capability, KBI wake-up support, and FLASH-based firmware field updateability.
Technical Context
The MC68HC908QY4VDT implements the M68HC08 CPU core with 16-bit address bus and Harvard architecture. Its oscillator module supports internal RC (trimmable to ±2% at 4 MHz), external crystal, or external clock input - with automatic failover and BUSCLKX2/BUSCLKX4 output options. The SIM integrates reset sources including power-on reset, COP timeout, LVI trip, and external IRQ.
Peripheral integration includes a 16-bit TIM module with input capture/output compare, 8-bit ADC with software-triggered conversion and interrupt-on-complete, and dual I/O ports (Port A: 8-bit bidirectional with KBI; Port B: 4-bit with IRQ capability). All modules operate under unified low-power modes: Wait (CPU stop, peripherals active) and Stop (full system halt with wake-up via KBI/IRQ/LVI).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | M68HC08 8-bit CISC core, 16-bit address space, 20 ns min instruction cycle @ 5 V |
| Memory | 4 KB FLASH (in-system programmable), 192 B RAM, no EEPROM - enables field firmware updates without external memory |
| ADC | 8-channel 8-bit successive-approximation ADC with 25 µs max conversion time and dedicated interrupt vector |
| Oscillator | Internal RC oscillator (1–8 MHz, factory-trimmed ±2% at 4 MHz), trimmable via OSCTRIM register for production calibration |
| I/O Ports | Port A: 8-bit with KBI wake-up pins; Port B: 4-bit with IRQ capability - supports keypad scanning and external event detection |
| Power Management | LVI threshold selectable at 4.25 V or 3.7 V; COP watchdog with 16 selectable timeout intervals (0.5 ms to 1.0 s) |
| Package | 16-pin SOIC (5.3 mm × 10.2 mm), RoHS-compliant, rated for –40°C to +85°C industrial temperature range |
Pinout & Package
MC68HC908QY4VDT is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch, compliant with JEDEC MS-012AC. Pin assignments are validated per Freescale Document MC68HC908QY/QT Family Data Sheet, Rev. 6 (2010), Figures 1-2 and Table 1-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | 5 V ±10% main supply; powers core, FLASH, and all I/O buffers |
| VSS | Ground reference | Digital ground return path; must be low-impedance connection to minimize noise coupling |
| PTA0–PTA7 | Port A data lines | Bidirectional I/O with KBI wake-up capability on PTA0–PTA3; default as inputs after reset |
| PTB0–PTB3 | Port B data lines | Bidirectional I/O with IRQ wake-up capability on PTB0–PTB1; supports external interrupt edge detection |
| OSC1 / XTAL1 | Clock input | Crystal amplifier input; accepts 1–8 MHz crystal or external CMOS clock signal |
| OSC2 / PTA4 / BUSCLKX4 | Clock output / I/O / clock divider | Crystal amplifier output; also serves as general-purpose I/O or outputs 4× bus clock for timing diagnostics |
| RESET | Active-low reset input | Asynchronous reset pin; internal pull-up ensures valid reset on power-up without external circuitry |
| IRQ | External interrupt request | Edge-triggered interrupt input (rising/falling configurable); shares pin with PTA6 in multiplexed mode |
Key Features
| Feature | Design Value |
|---|---|
| FLASH Block Protection | Configurable protection of top 512 B or bottom 512 B of FLASH to prevent accidental overwrite during debug or field update |
| Auto Wakeup Module (AWU) | Programmable 1–256 ms wake-up interval from Wait mode using internal RC clock - eliminates need for external timer |
| Monitor Mode Entry | Single-wire background debug entry via BKGD pin using dedicated monitor ROM - enables non-intrusive code inspection and flash programming |
| Low-Voltage Inhibit (LVI) | Hysteresis-enabled voltage monitoring with two trip points (4.25 V/3.7 V) and forced reset assertion below threshold - prevents erratic operation during brownout |
| Keyboard Interrupt (KBI) | Hardware scan logic for up to 4×4 matrix keypad with debounce filtering and individual pin interrupt enable - reduces CPU overhead in HMI applications |
Applications
| Appliance Motor Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Speed-regulated fan or pump drive in HVAC or white goods using PWM output and thermal feedback. IC Role / Device Role / Timing Role: Primary controller executing closed-loop PID algorithm, reading thermistor/NTC via ADC, generating PWM on PTB pins, and managing user interface via KBI. Use Value: Integrated ADC, KBI, and COP eliminate need for external analog front-end and watchdog IC - reducing BOM count and PCB area by ≥3 components. | Use Scenario: Remote temperature/humidity node transmitting data over RS-485 with local LED status indication. IC Role / Device Role / Timing Role: Sensor signal conditioner and protocol handler; ADC digitizes analog sensor outputs, UART (bit-banged) formats data, and GPIO drives LEDs. Use Value: 4 KB FLASH supports full Modbus RTU stack plus sensor calibration tables; LVI ensures reliable operation during line-voltage sags common in factory environments. |
| Consumer Keypad Interface | Power Supply Monitoring |
Use Scenario: Microwave oven or coffee maker control panel with 3×4 membrane keypad and display backlight control. IC Role / Device Role / Timing Role: Keypad scanner and system supervisor; KBI detects keypresses, COP monitors firmware execution, and LVI guards against undervoltage latch-up. Use Value: Hardware KBI scan offloads CPU during idle; wake-up from Stop mode on keypress achieves <1 µA standby current - extending battery life in portable variants. | Use Scenario: DC-DC converter supervisory unit verifying input rail stability and triggering shutdown on overvoltage/undervoltage. IC Role / Device Role / Timing Role: Analog monitor and decision engine; ADC measures scaled input voltage, LVI provides fast hardware trip, and GPIO asserts fault signal. Use Value: Dual-voltage LVI thresholds (4.25 V/3.7 V) allow precise trip point tuning; internal oscillator ensures timing-critical response independent of external clock integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA2CFD | RS08 core, 2 KB FLASH, no KBI, 10-bit ADC, 16-pin SOIC - lower gate count, no hardware keypad scan logic | Suitable for simpler sensor readout without matrix input; lacks KBI-driven wake-up efficiency | Select when cost sensitivity outweighs need for hardware keypad support and legacy HC08 toolchain compatibility |
| STM8S003F3P6 | STM8 core, 8 KB FLASH, 1 KB RAM, 10-bit ADC, 20-pin TSSOP - higher performance, no native KBI but GPIO interrupt flexibility | Better suited for applications requiring larger code space or faster ADC sampling; requires software keypad scan | Choose for new designs needing extended memory or higher ADC resolution; verify layout compatibility due to different pinout and package |
Compared with MC68HC908QY4VDT, MC9RS08KA2CFD offers lower cost and power but sacrifices KBI hardware acceleration and legacy HC08 ecosystem support, while STM8S003F3P6 delivers greater memory and ADC precision at the expense of increased software development effort for keypad handling and toolchain migration.
Availability
MC68HC908QY4VDT is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor interface, consumer keypad interface, and power supply monitoring requiring stable component supply across long-lifecycle industrial programs.
Supply support for MC68HC908QY4VDT 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, with roots in Freescale's embedded MCU heritage.
The MC68HC908QY/QT family was designed for cost-optimized, low-pin-count embedded control in appliances and industrial equipment - emphasizing integrated analog peripherals, robust reset supervision, and field-programmable FLASH in compact packages.
FAQ
What is the maximum operating frequency of the MC68HC908QY4VDT?
The MC68HC908QY4VDT operates with a maximum bus clock frequency of 8 MHz, derived from its internal RC oscillator (factory-trimmed to ±2% at 4 MHz) or external crystal/clock source. The CPU executes instructions at this bus clock rate, with typical instruction cycles ranging from 1 to 5 bus clocks depending on opcode - enabling deterministic real-time response in motor control loops and sensor sampling routines. The MC68HC908QY4VDT supports BUSCLKX2 and BUSCLKX4 outputs for system-level timing verification.
Does the MC68HC908QY4VDT support in-circuit debugging?
Yes, the MC68HC908QY4VDT supports single-wire background debug via the BKGD pin using on-chip monitor ROM. This allows non-intrusive program download, breakpoint setting, and register inspection without halting peripheral operation - critical for validating real-time behavior in applications like appliance motor control. Debug access requires compatible Freescale/NXP BDM tools and does not consume any user FLASH or RAM resources.
How is FLASH memory protected against accidental erasure on the MC68HC908QY4VDT?
The MC68HC908QY4VDT implements FLASH block protection via the FLASH Block Protect Register (FLBPR) at address $FFBE. Protection can be enabled for either the top 512 bytes or bottom 512 bytes of FLASH, preventing unintended program/erase operations during development or field updates. Protection is disabled only by a specific 2-cycle write sequence to FLBPR, ensuring robustness against spurious writes caused by noise or software faults in the MC68HC908QY4VDT firmware.
Can the MC68HC908QY4VDT operate from a 3.3 V supply?
No, the MC68HC908QY4VDT is specified for 4.5 V to 5.5 V operation only, as confirmed by its Absolute Maximum Ratings and Electrical Characteristics tables in the Freescale MC68HC908QY/QT Family Data Sheet, Rev. 6. Its internal oscillator, FLASH programming voltage, and I/O buffer thresholds are optimized for 5 V logic levels. Attempting 3.3 V operation will result in undefined behavior, failed FLASH writes, and unreliable reset assertion - use MC9RS08KA2CFD or similar 3 V–5.5 V tolerant devices instead.
What peripheral modules are available for low-power operation on the MC68HC908QY4VDT?
The MC68HC908QY4VDT supports two low-power states: Wait mode (CPU halted, peripherals active) and Stop mode (full system clock gated, RAM retained). Key peripherals retaining functionality in Wait mode include the Auto Wakeup Module (AWU), Keyboard Interrupt (KBI), and External IRQ - enabling wake-up on timed interval or external event. In Stop mode, only LVI, COP timeout, and external RESET can resume operation, achieving sub-1 µA quiescent current for battery-backed applications.
MC68HC908QY4VDT 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:
- 4KB (4K 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908QY4VDT FAQ
1.How can I place an order for MC68HC908QY4VDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908QY4VDT 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 MC68HC908QY4VDT reliable?
The price and inventory of MC68HC908QY4VDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908QY4VDT is usually 5 days.
3.What payment methods are accepted for MC68HC908QY4VDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908QY4VDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908QY4VDT?
MC68HC908QY4VDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908QY4VDT 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 MC68HC908QY4VDT?
For technical support, including MC68HC908QY4VDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908QY4VDT requirements.
6.How does Aetrix verify that MC68HC908QY4VDT is sourced from the original manufacturer or authorized distributors?
All MC68HC908QY4VDT 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 MC68HC908QY4VDT meets industry standards.
7.What is the process for return or replacement of MC68HC908QY4VDT?
All MC68HC908QY4VDT units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908QY4VDT, 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 MC68HC908QY4VDT part is unused and in its original packaging.
Return procedure for MC68HC908QY4VDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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