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NXP Semiconductors MC68HC908QY4CDT
- Part No.:
- MC68HC908QY4CDT
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC68HC908QY4CDT.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,244
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Product details
Overview
MC68HC908QY4CDT from NXP Semiconductors (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 internal RC oscillator (4 MHz nominal), 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 MC68HC908QY4CDT datasheet, MC68HC908QY4CDT pinout, MC68HC908QY4CDT application, or MC68HC908QY4CDT equivalent, key selection criteria include its 16-pin SOIC package, 5 V operation, internal oscillator trim capability, KBI wake-up support, and FLASH-based firmware updateability in resource-constrained systems.
Technical Context
The MC68HC908QY4CDT implements the HCS08 CPU core with 16-bit address bus, supporting up to 64 KB memory space. Its oscillator module supports internal RC (±2% typical at 25°C, 5 V), external crystal (up to 8 MHz), or RC network configurations, with programmable trim via OSCTRIM register at $FFC0.
Peripheral integration includes a 16-bit Timer Interface Module (TIM) with input capture/output compare, Auto Wakeup Module (AWU) with programmable timeout (1–1024 ms), and Low-Voltage Inhibit (LVI) with selectable trip points (4.25 V or 3.7 V). All modules operate under WAIT/STOP low-power modes with full register retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit CISC core with 16-bit addressing; enables compact code and deterministic real-time response. |
| FLASH Memory | 4 KB on-chip FLASH with block protection; supports in-system programming and firmware updates without external hardware. |
| RAM | 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 conversion time; suitable for analog sensor interfacing (e.g., thermistors, potentiometers). |
| Oscillator | Internal RC oscillator trimmed to ±2% accuracy at 4 MHz (5 V, 25°C); eliminates external crystal cost and board space. |
| Supply Voltage | 4.5 V to 5.5 V operation; compatible with standard 5 V logic and power rails in industrial control panels. |
| Package | 16-pin SOIC (Small Outline Integrated Circuit); industry-standard footprint for automated assembly and thermal management. |
Pinout & Package
MC68HC908QY4CDT is housed in a 16-pin SOIC package (case 751BD-02), 7.5 mm × 10.3 mm body, 1.27 mm pitch. Pinout validated per Freescale MC68HC908QY/QT Family Data Sheet, Rev. 6, Figure 1-2 and Table 1-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 5 V supply input; requires local 0.1 µF decoupling capacitor for stable MCU operation. |
| VSS | GND | Digital ground reference; must be connected to system ground plane with low-impedance path. |
| PTA0–PTA7 | Port A I/O | 8-bit bidirectional port; PTA0–PTA3 serve as ADC inputs; PTA4 is OSC2/BUSCLKX4; PTA7 is IRQ input. |
| PTB0–PTB3 | Port B I/O | 4-bit bidirectional port; PTB0–PTB2 support keyboard interrupt (KBI); PTB3 is reset input (active-low). |
| OSC1 | Clock input | Crystal amplifier input; used with external 32.768 kHz or 1–8 MHz crystal when internal RC is disabled. |
| RESET | Reset input | Active-low asynchronous reset; held low for ≥2 µs to initiate cold start or recovery from fault condition. |
Key Features
| Feature | Design Value |
|---|---|
| Internal oscillator trimming | OSCTRIM register ($FFC0) allows factory or field calibration to maintain ±2% frequency accuracy across voltage/temperature. |
| Keyboard interrupt (KBI) | Hardware scan of up to 8 keys via PTB0–PTB2 and PTA0–PTA3; enables ultra-low-power wake-up from STOP mode with <1 µA current draw. |
| Computer Operating Properly (COP) | Watchdog timer with programmable timeout (1.0–4.1 ms); prevents runaway code by forcing reset if not serviced within window. |
| Low-voltage inhibit (LVI) | Configurable 4.25 V or 3.7 V trip point with hysteresis; holds MCU in reset during brown-out to prevent erratic execution. |
| FLASH block protection | FLBPR register ($FFBE) enables write-protection of top 512 B or bottom 512 B of FLASH; safeguards bootloader or calibration data. |
Applications
| Home Appliance Control | Industrial Sensor Node |
|---|---|
Use Scenario: Microcontroller in washing machine control panel managing motor sequencing, water level sensing, and user interface. IC Role / Device Role / Timing Role: Central controller executing state-machine logic, reading analog pressure/temperature sensors via ADC, and scanning membrane keypad via KBI. Use Value: Internal RC oscillator eliminates crystal BOM cost; 4 KB FLASH accommodates multi-cycle wash programs; KBI enables instant wake-up from STOP mode during button press. | Use Scenario: Standalone temperature/humidity monitor mounted in HVAC duct with 4–20 mA output. IC Role / Device Role / Timing Role: Signal conditioner and protocol translator-digitizing analog sensor outputs, applying linearization, and driving current-loop DAC. Use Value: 8-bit ADC with 25 µs conversion meets 100 Hz sampling requirement; LVI ensures reliable operation during line sags; COP prevents firmware lockup in unattended deployment. |
| Motor Drive Interface | Smart Power Outlet |
Use Scenario: Fan speed controller in commercial air handler using triac phase-angle dimming. IC Role / Device Role / Timing Role: Timing-critical zero-crossing detector and PWM generator coordinating with external triac driver IC. Use Value: TIM module provides precise 125 µs resolution timing for phase control; 16-pin SOIC fits compact PCB layout near triac; 5 V tolerance matches mains-derived supply. | Use Scenario: Energy-monitoring outlet with relay control, current sensing, and LED status indication. IC Role / Device Role / Timing Role: System manager handling AC zero-cross detection, RMS current calculation, relay actuation, and LED blink patterns. Use Value: AWU module enables 1-second periodic wake-up for energy sampling without external RTC; FLASH retains calibration constants across power cycles. |
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, no KBI, 10-bit ADC, 20 MHz max clock | Lacks keyboard interrupt module; higher ADC resolution but lower memory and no dedicated KBI wake-up | Select when higher ADC precision is required and keypad interface is handled externally or via GPIO polling. |
| STM8S003F3P6 | STM8 core, 8 KB FLASH, 1 KB RAM, 10-bit ADC, 16 MHz max clock, built-in EEPROM | Higher performance and memory; lacks native KBI but offers flexible EXTI wake-up sources | Choose for applications needing larger firmware footprint or EEPROM-based parameter storage; requires software KBI emulation. |
Compared with MC68HC908QY4CDT, MC9RS08KA2CSC trades KBI and oscillator trim for lower cost and simpler architecture, while STM8S003F3P6 offers greater resources and modern toolchain support at the expense of legacy HCS08 ecosystem compatibility.
Availability
MC68HC908QY4CDT is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, motor drive interfaces, and smart power outlets requiring stable component supply and long-term industrial availability.
Supply support for MC68HC908QY4CDT 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 for automotive, industrial, and IoT markets.
The MC68HC908QY/QT family was designed for cost-optimized, low-pin-count embedded control in appliances and industrial equipment where reliability, low power, and minimal external components are critical.
FAQ
What is the maximum operating frequency of the MC68HC908QY4CDT?
The MC68HC908QY4CDT operates with a maximum bus clock frequency of 8 MHz. When using the internal RC oscillator, it runs at 4 MHz nominal (trimmable to ±2%); with external crystal or RC network, it supports up to 8 MHz. The BUSCLKX2 and BUSCLKX4 pins provide divided clock outputs for peripheral synchronization.
Does the MC68HC908QY4CDT support in-circuit programming?
Yes, the MC68HC908QY4CDT supports in-system programming (ISP) via its single-wire background debug interface (BDM). Using a compatible programmer, firmware can be loaded or updated without removing the device from the PCB, leveraging the on-chip 4 KB FLASH memory and FLBPR protection register.
How does the keyboard interrupt (KBI) module function on the MC68HC908QY4CDT?
The KBI module on the MC68HC908QY4CDT monitors up to eight inputs (PTA0–PTA3 and PTB0–PTB3) for edge transitions. It generates an interrupt and wakes the MCU from STOP mode with sub-millisecond latency. Configuration is done via KBISE and KBIE registers, enabling selective key masking and active-high/low polarity.
What are the low-power modes supported by the MC68HC908QY4CDT?
The MC68HC908QY4CDT supports WAIT and STOP modes. WAIT mode halts the CPU while peripherals remain active; STOP mode disables the oscillator and reduces current to <1 µA. Both modes retain RAM and register contents. Wake-up sources include IRQ, KBI, AWU timeout, and reset.
Is the MC68HC908QY4CDT pin-compatible with other devices in the QY/QT family?
Yes, the MC68HC908QY4CDT shares identical pinout and package (16-pin SOIC) with MC68HC908QY2CDT and MC68HC908QY1CDT. Differences lie in FLASH size (4 KB vs. 2 KB vs. 1 KB) and RAM (192 B vs. 128 B vs. 64 B), allowing hardware reuse across product variants with firmware scaling.
MC68HC908QY4CDT 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908QY4CDT FAQ
1.How can I place an order for MC68HC908QY4CDT through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908QY4CDT 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 MC68HC908QY4CDT reliable?
The price and inventory of MC68HC908QY4CDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908QY4CDT is usually 5 days.
3.What payment methods are accepted for MC68HC908QY4CDT?
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MC68HC908QY4CDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908QY4CDT 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 MC68HC908QY4CDT?
For technical support, including MC68HC908QY4CDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908QY4CDT requirements.
6.How does Aetrix verify that MC68HC908QY4CDT is sourced from the original manufacturer or authorized distributors?
All MC68HC908QY4CDT 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 MC68HC908QY4CDT meets industry standards.
7.What is the process for return or replacement of MC68HC908QY4CDT?
All MC68HC908QY4CDT units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908QY4CDT, 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 MC68HC908QY4CDT part is unused and in its original packaging.
Return procedure for MC68HC908QY4CDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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