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NXP Semiconductors MC68HC908QY1CDW
- Part No.:
- MC68HC908QY1CDW
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC908QY1CDW.pdf
- Description:
- IC MCU 8BIT 1.5KB FLASH 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,877
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Product details
Overview
MC68HC908QY1CDW from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller in a 16-pin SOIC package, featuring 4 KB Flash, 192 B RAM, on-chip 8-channel 8-bit ADC, internal 2–8 MHz RC oscillator with trimming, and integrated COP watchdog. It targets low-cost embedded control in battery-powered sensors and appliance sub-systems.
For engineers reviewing the MC68HC908QY1CDW datasheet, MC68HC908QY1CDW pinout, MC68HC908QY1CDW application, or MC68HC908QY1CDW equivalent, key selection criteria include its 16-pin SOIC footprint, 4 KB Flash/192 B RAM memory map, internal RC oscillator accuracy (±2% after trim), KBI keyboard interrupt support, and LVI voltage monitor threshold at 2.5 V nominal.
Technical Context
The MC68HC908QY1CDW implements the M68HC08 CPU core with 16-bit address bus and 8-bit data path, executing instructions at up to 8 MHz bus clock derived from its internal RC oscillator. Its SIM integrates reset generation, clock control, and interrupt vectoring with priority-based IRQ handling.
It includes a dedicated Keyboard Interrupt Module (KBI) supporting up to 8-key matrix scanning with wake-from-wait capability, and a Low-Voltage Inhibit (LVI) circuit that asserts reset when VDD drops below 2.5 V ±0.2 V, with hysteresis for noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | M68HC08 8-bit CPU with 16-bit addressing; enables compact code for resource-constrained control tasks. |
| Flash Memory | 4 KB on-chip Flash with block protection; supports in-system programming and field firmware updates. |
| RAM Size | 192 bytes of on-chip RAM; sufficient for real-time variable storage in small control loops. |
| ADC Resolution | 8-bit successive-approximation ADC with 8 input channels; provides basic analog sensing without external converters. |
| Oscillator Type | Trimmed internal RC oscillator (2–8 MHz); eliminates need for external crystal in cost-sensitive designs. |
| LVI Threshold | 2.5 V ±0.2 V reset threshold with hysteresis; ensures reliable brown-out protection across temperature. |
| Package | 16-pin SOIC (300 mil width); standard surface-mount footprint compatible with automated assembly. |
Pinout & Package
MC68HC908QY1CDW is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package with 300-mil body width and standard 1.27 mm pitch. Pin assignments are validated per Freescale MC68HC908QY/QT Family Data Sheet, Rev. 6 (2010), Figure 1-2 and Table 1-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Primary 3.0–5.5 V supply rail; powers all digital and analog blocks including ADC and LVI. |
| VSS | GND reference | Digital ground return; must be low-impedance connection to minimize noise coupling into ADC and oscillator. |
| PTA0–PTA7 | Port A I/O pins | 8-bit bidirectional port with configurable pull-ups; PTA0–PTA3 serve as KBI inputs; PTA4 = OSC2/BUSCLKX4. |
| PTB0–PTB3 | Port B I/O pins | 4-bit bidirectional port; PTB0–PTB2 support IRQ and AWU functions; PTB3 is reserved/not bonded. |
| IRQ | External interrupt input | Edge-triggered active-low interrupt pin; shares function with PTB0; used for asynchronous event wakeup. |
| RESET | Active-low reset input | Hardware reset pin; also accepts internal LVI and COP timeout resets; requires external pull-up. |
| OSC1 | Crystal amplifier input | Input for external crystal or ceramic resonator; unused when internal RC oscillator is selected. |
| OSC2/PTA4/BUSCLKX4 | Multiplexed output | Outputs internal oscillator or crystal-derived clock; BUSCLKX4 = 4× bus clock for debug timing reference. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip COP watchdog | Configurable timeout (0.5 ms to 1.0 s) prevents runaway code; essential for unattended operation in industrial controls. |
| Auto Wakeup Module (AWU) | Generates periodic interrupts from stop mode using internal RC clock; enables ultra-low-power sensor polling at 1–1024 ms intervals. |
| Keyboard Interrupt Module (KBI) | Scans up to 8 keys with debouncing and wake-on-press; reduces host MCU polling overhead in user-interface subsystems. |
| FLASH block protection | Configurable write/erase lock per 512-byte block; prevents accidental firmware corruption during field updates. |
| Internal oscillator trimming | Factory-trimmed to ±2% accuracy at 5 V/25°C; user-adjustable via OSCTRIM register for system-level calibration. |
Applications
| Home Appliance Control | Industrial Sensor Node |
|---|---|
Use Scenario: Microcontroller managing LED indicators, button inputs, and motor timing in microwave oven control panel. IC Role / Device Role / Timing Role: Primary system controller executing state machine logic, reading KBI matrix, driving display segments via GPIO, and generating PWM for fan speed. Use Value: Integrated KBI and 8-bit ADC eliminate external interface ICs; 4 KB Flash accommodates full UI firmware with diagnostics. | Use Scenario: Battery-powered temperature/humidity sensor transmitting data via UART to gateway every 30 seconds. IC Role / Device Role / Timing Role: System-on-chip sensor aggregator performing ADC conversion, LVI monitoring, and low-power wake scheduling via AWU. Use Value: Internal RC oscillator and AWU enable <10 µA stop-mode current; LVI reset prevents erratic behavior during battery sag. |
| Smart Power Outlet | Medical Diagnostic Tool |
Use Scenario: AC outlet with energy monitoring, relay control, and push-button configuration. IC Role / Device Role / Timing Role: Safety-critical supervisor managing relay drive timing, zero-cross detection (via GPIO edge capture), and overvoltage shutdown. Use Value: COP watchdog ensures fail-safe relay de-energization; LVI reset at 2.5 V guarantees clean restart during brownouts. | Use Scenario: Portable blood glucose meter requiring precise analog front-end and low-power operation between tests. IC Role / Device Role / Timing Role: Signal acquisition controller sampling test strip voltage via ADC, applying calibration coefficients, and displaying results. Use Value: 8-bit ADC with internal reference supports 10-bit effective resolution; trimmed oscillator ensures consistent sampling intervals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68HC908QY2CDW | 8 KB Flash, 256 B RAM, same package and peripheral set; higher memory for expanded feature sets. | Supports larger firmware images with bootloader, communication stacks, or enhanced UI logic. | Select when firmware size exceeds 4 KB or additional RAM buffers are required for data logging. |
| MC9RS08KA2CSC | Renesas RS08 core, 2 KB Flash, 128 B RAM, 16-pin SOIC; lower cost but reduced peripherals (no KBI, no AWU). | Suitable for simpler GPIO + ADC tasks without keyboard scan or periodic wakeup needs. | Choose for lowest BOM cost where KBI and AWU are unnecessary and memory demand is ≤2 KB. |
Compared with MC68HC908QY2CDW and MC9RS08KA2CSC, the MC68HC908QY1CDW offers optimal balance of integrated KBI, AWU, and 4 KB Flash in a mature, widely supported 16-pin SOIC package-ideal for cost-sensitive, battery-aware control applications requiring robust human interface and power management.
Availability
MC68HC908QY1CDW is available at Aetrix Electronics and suitable for home appliance control, industrial sensor nodes, and smart power outlets requiring stable component supply and long-term industrial lifecycle support.
Supply support for MC68HC908QY1CDW 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 specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The MC68HC908QY1CDW belongs to the legacy HCS08 microcontroller family designed for cost-effective, low-power embedded control in appliances, sensors, and consumer electronics with minimal external components.
FAQ
What is the maximum operating frequency of the MC68HC908QY1CDW?
The MC68HC908QY1CDW supports a maximum bus clock frequency of 8 MHz, derived from its internal trimmed RC oscillator operating at 2–8 MHz. This frequency is confirmed in Section 11.3.1 of the Freescale MC68HC908QY/QT Family Data Sheet, Rev. 6, and defines the upper limit for instruction execution and peripheral timing.
Does the MC68HC908QY1CDW support in-circuit debugging?
Yes, the MC68HC908QY1CDW supports background debug mode (BDM) via the BKGD pin, enabling non-intrusive program download, breakpoint setting, and real-time register inspection. This capability is documented in Chapter 15 "Development Support" of the official datasheet and requires a compatible BDM pod or debugger interface.
What is the ADC reference voltage source for the MC68HC908QY1CDW?
The MC68HC908QY1CDW ADC uses VDD as its default reference voltage, with optional selection of an internal 1.28 V bandgap reference via the ADCSC1 register. This dual-reference flexibility allows accurate measurements across varying supply conditions, as specified in Section 3.3.2 of the MC68HC908QY/QT Family Data Sheet, Rev. 6.
Can the MC68HC908QY1CDW operate from a 3.3 V supply?
Yes, the MC68HC908QY1CDW operates across a 3.0–5.5 V supply range, making it fully compatible with 3.3 V systems. Electrical specifications for 3 V operation-including oscillator deviation, ADC performance, and LVI thresholds-are detailed in Sections 16.12 and 16.13 of the datasheet, confirming robust functionality at nominal 3.3 V.
Is there hardware support for UART communication on the MC68HC908QY1CDW?
No, the MC68HC908QY1CDW does not include a dedicated UART peripheral. Communication must be implemented via bit-banged GPIO using Timer Interface Module (TIM) channels for baud rate timing, as outlined in Application Note AN2292. This software UART approach is validated for low-speed serial links up to 9600 bps.
MC68HC908QY1CDW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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:
MC68HC908QY1CDW FAQ
1.How can I place an order for MC68HC908QY1CDW through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908QY1CDW 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 MC68HC908QY1CDW reliable?
The price and inventory of MC68HC908QY1CDW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908QY1CDW is usually 5 days.
3.What payment methods are accepted for MC68HC908QY1CDW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908QY1CDW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68HC908QY1CDW?
MC68HC908QY1CDW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908QY1CDW 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 MC68HC908QY1CDW?
For technical support, including MC68HC908QY1CDW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908QY1CDW requirements.
6.How does Aetrix verify that MC68HC908QY1CDW is sourced from the original manufacturer or authorized distributors?
All MC68HC908QY1CDW 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 MC68HC908QY1CDW meets industry standards.
7.What is the process for return or replacement of MC68HC908QY1CDW?
All MC68HC908QY1CDW units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908QY1CDW, 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 MC68HC908QY1CDW part is unused and in its original packaging.
Return procedure for MC68HC908QY1CDW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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