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NXP Semiconductors MCHC908QY4MDWE
- Part No.:
- MCHC908QY4MDWE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MCHC908QY4MDWE.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,361
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Product details
Overview
MCHC908QY4MDWE 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 10-bit ADC. It operates at up to 8 MHz bus frequency using an internal trimmed RC oscillator and supports low-power wait/stop modes. Used in cost-sensitive embedded control applications such as appliance motor interfaces and sensor signal conditioning.
For engineers reviewing the MCHC908QY4MDWE datasheet, MCHC908QY4MDWE pinout, MCHC908QY4MDWE application, or MCHC908QY4MDWE equivalent, key selection criteria include its 8-pin SOIC-W package, 5 V operation, on-chip COP watchdog, keyboard interrupt module, and lack of UART or SPI peripherals - requiring external serial bridging for host communication.
Technical Context
The MCHC908QY4MDWE implements the HCS08 CPU core with 16-bit address space, supporting indexed, extended, and relative addressing. Its memory map includes 4 KB FLASH (with block protection), 192 B RAM, and 32 B EEPROM emulation via FLASH. The device uses a single-cycle CPU architecture with 24-bit instruction word format and supports WAIT/STOP low-power states with wake-up via IRQ, KBI, or AWU.
Peripherals include an 8-channel 10-bit ADC with programmable conversion clock prescaler, a 16-bit TIM module with input capture/output compare, a keyboard interrupt module with 4-key scan support, and a low-voltage inhibit (LVI) circuit with selectable trip points (4.25 V or 3.75 V). No hardware UART, I²C, or SPI is integrated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit CISC core with 24-bit instruction word; executes most instructions in 1–2 bus cycles. |
| FLASH Memory | 4 KB on-chip FLASH with page/mass erase, block protection register (FLBPR), and 100K write/erase cycles. |
| RAM Size | 192 bytes of on-chip RAM; retains data in WAIT mode but not in STOP mode unless LVI enabled. |
| ADC Resolution | 10-bit successive-approximation ADC with 8 input channels; conversion time programmable from 16–256 bus cycles. |
| Operating Voltage | 4.5 V to 5.5 V supply range; LVI monitors VDD and asserts reset if voltage drops below selected threshold. |
| Max Bus Frequency | 8 MHz (internal RC oscillator, factory-trimmed to ±2% at 5 V, 25°C); no external crystal required. |
| Package | 8-pin SOIC-W (wide-body), 300 mil width; pin-compatible with MC68HC908QT4 but differs in port configuration. |
Pinout & Package
Package: 8-pin SOIC-W (Wide Body), 300 mil width, JEDEC MS-012AC. Thermal pad not present. Lead finish: matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 4.5–5.5 V supply rail; must be decoupled with 0.1 µF ceramic capacitor near pin. |
| VSS | Ground reference | Digital ground return; connect directly to PCB ground plane with low-inductance path. |
| PTA0/IRQ | Port A bit 0 / External interrupt input | Configurable as general-purpose I/O or active-low edge-triggered IRQ source; default pull-up enabled. |
| PTA1/KBI0 | Port A bit 1 / Keyboard interrupt input 0 | Supports keyboard matrix scanning; debounced internally; shares pin with PTA1 function. |
| PTA2/KBI1 | Port A bit 2 / Keyboard interrupt input 1 | Second KBI input; enables 2×2 key matrix detection without external diodes or resistors. |
| PTA3/OSC1 | Port A bit 3 / Crystal amplifier input | Internal oscillator input; when using internal RC mode, functions as GPIO; OSC1 unused in RC mode. |
| PTA4/OSC2/BUSCLKX4 | Port A bit 4 / Oscillator output / 4× bus clock | Outputs internal oscillator signal or BUSCLKX4; can be configured as GPIO only when oscillator disabled. |
| RESET | Active-low reset input | Asynchronous reset pin; internal pull-up; accepts external push-button or supervisor IC assertion. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip COP watchdog | Configurable timeout (0.5 ms to 1.0 s) with independent clock source; prevents runaway code execution. |
| Auto Wakeup Module (AWU) | Generates periodic interrupts from STOP mode using internal RC oscillator; wakeup intervals from 16 ms to 4.1 s. |
| Keyboard Interrupt Module (KBI) | Hardware-accelerated 4-key scan with noise filtering; reduces CPU overhead vs. software polling. |
| Low-Voltage Inhibit (LVI) | Programmable reset threshold (4.25 V or 3.75 V) with hysteresis; ensures reliable operation during brownout. |
| FLASH block protection | Software-lockable FLASH blocks prevent accidental overwrite during field firmware updates. |
Applications
| Appliance Motor Control | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Embedded controller for small DC motor speed regulation in washing machine drain pumps. IC Role / Device Role / Timing Role: Executes closed-loop PWM duty cycle adjustment based on tachometer feedback and user program logic. Use Value: Integrates ADC (for current sensing), TIM (for PWM generation), and KBI (for control panel buttons) in one 8-pin package. |
Use Scenario: Signal conditioning and local decision-making for temperature/humidity sensor nodes in HVAC ducts. IC Role / Device Role / Timing Role: Reads analog sensor outputs via 10-bit ADC, applies calibration coefficients, and triggers relay outputs on threshold breach. Use Value: Operates reliably across –40°C to +85°C industrial temp range with internal LVI and STOP-mode power consumption < 1 µA. |
| Consumer Remote Control Hub | Smart Power Outlet Monitoring |
|
Use Scenario: Central receiver for IR remote commands and local LED status indication in battery-powered smart home hubs. IC Role / Device Role / Timing Role: Decodes NEC/RC5 protocols via IRQ-driven edge detection and manages multi-color LED timing via TIM outputs. Use Value: Uses AWU to wake every 500 ms for IR carrier detection, achieving >1-year CR2032 battery life in standby. |
Use Scenario: Energy monitoring unit that measures AC load current via shunt resistor and reports overcurrent events. IC Role / Device Role / Timing Role: Samples shunt voltage at 1 kHz using ADC with internal 8 MHz clock; calculates RMS and triggers shutdown via PTA0. Use Value: On-chip 4 KB FLASH stores calibration tables and event logs; COP ensures safe fail-safe behavior during transient grid disturbances. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA2CPD | RS08 core, 2 KB FLASH, 128 B RAM, no KBI, no AWU; 8-pin SOIC-W; 1.8–3.6 V operation. | Requires level-shifting for 5 V systems; lacks keyboard scan hardware and periodic wakeup capability. | Select when ultra-low voltage (1.8 V) operation or smaller code footprint is prioritized over KBI/AWU features. |
| STM8S003F3P6 | STM8 core, 8 KB FLASH, 1 KB RAM, integrated UART/SPI, 10-bit ADC, 3.0–5.5 V operation; 20-pin TSSOP. | Larger package and higher pin count; adds serial communication but increases BOM and layout complexity. | Select when UART-based diagnostics or firmware updates are required, and board space allows 20-pin footprint. |
Compared with MCHC908QY4MDWE, MC9RS08KA2CPD offers lower voltage operation but removes KBI and AWU - limiting suitability for keypad-based wake-up designs; STM8S003F3P6 adds communication peripherals and memory but requires PCB redesign due to 20-pin TSSOP packaging.
Availability
MCHC908QY4MDWE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor interface, and consumer remote control hub applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant 8-pin SOIC-W packaging.
Supply support for MCHC908QY4MDWE 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, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.
The MCHC908QY4MDWE belongs to the legacy HCS08 microcontroller family, designed for cost-optimized, low-pin-count embedded control where integration of ADC, KBI, and low-power modes outweighs need for serial interfaces.
FAQ
What is the maximum operating frequency of the MCHC908QY4MDWE?
The MCHC908QY4MDWE operates with a maximum bus frequency of 8 MHz, derived from its factory-trimmed internal RC oscillator. This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and 4.5–5.5 V supply, with typical accuracy of ±2% at 25°C. External clock sources are not supported on this variant.
Does the MCHC908QY4MDWE include a hardware UART or SPI peripheral?
No, the MCHC908QY4MDWE does not integrate UART, SPI, or I²C peripherals. Communication with external hosts must be implemented via bit-banged GPIO protocols or by interfacing with external transceivers. Its peripheral set focuses on analog acquisition (10-bit ADC), timing (TIM), and human-interface functions (KBI, AWU).
How is FLASH memory protected against accidental writes on the MCHC908QY4MDWE?
The MCHC908QY4MDWE uses a FLASH Block Protect Register (FLBPR) at address $FFBE to lock individual 512-byte blocks. Once written, protection persists until a mass erase is performed. This prevents unintended firmware corruption during debug sessions or field updates, and is configurable via standard background programming commands.
Can the MCHC908QY4MDWE operate in STOP mode with the ADC active?
No - the ADC is disabled in STOP mode on the MCHC908QY4MDWE. Only the Auto Wakeup Module (AWU), Low-Voltage Inhibit (LVI), and external IRQ can wake the device from STOP. ADC conversions require the system clock to be active, so they must occur in RUN or WAIT mode before entering STOP.
What development tools support the MCHC908QY4MDWE?
The MCHC908QY4MDWE is supported by the legacy CodeWarrior Development Studio for HCS08, along with P&E Micro's Multilink/Cyclone programmers and Freescale's DEMO908QY4 evaluation board. Debugging uses background mode via single-wire BDM interface on PTA3/OSC1 pin.
MCHC908QY4MDWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Series:
- HC08
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MCHC908QY4MDWE FAQ
1.How can I place an order for MCHC908QY4MDWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MCHC908QY4MDWE 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 MCHC908QY4MDWE reliable?
The price and inventory of MCHC908QY4MDWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCHC908QY4MDWE is usually 5 days.
3.What payment methods are accepted for MCHC908QY4MDWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCHC908QY4MDWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCHC908QY4MDWE?
MCHC908QY4MDWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCHC908QY4MDWE 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 MCHC908QY4MDWE?
For technical support, including MCHC908QY4MDWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCHC908QY4MDWE requirements.
6.How does Aetrix verify that MCHC908QY4MDWE is sourced from the original manufacturer or authorized distributors?
All MCHC908QY4MDWE 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 MCHC908QY4MDWE meets industry standards.
7.What is the process for return or replacement of MCHC908QY4MDWE?
All MCHC908QY4MDWE units undergo pre-shipment inspection (PSI). If there is an issue with MCHC908QY4MDWE, 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 MCHC908QY4MDWE part is unused and in its original packaging.
Return procedure for MCHC908QY4MDWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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