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NXP Semiconductors MC908JK3EMDWE
- Part No.:
- MC908JK3EMDWE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC908JK3EMDWE.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,971
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Product details
Overview
MC908JK3EMDWE from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 4 KB FLASH, 192 B RAM, a 10-bit ADC with 8 channels, a 16-bit TIM module with input capture/output compare/PWM, and on-chip COP watchdog. It operates at up to 8 MHz bus frequency and supports 5 V or 3 V supply, targeting low-cost embedded control in appliance motor drives and industrial sensor interfaces.
For engineers reviewing the MC908JK3EMDWE datasheet, MC908JK3EMDWE pinout, MC908JK3EMDWE application, or MC908JK3EMDWE equivalent, key selection criteria include its 20-pin SOIC package, integrated KBI keyboard interrupt support, LVI brown-out detection, and Monitor ROM-based in-system programming capability - all critical for cost-sensitive, space-constrained MCU deployments.
Technical Context
The MC908JK3EMDWE implements the HCS08 CPU core with 5-stage instruction pipeline, supporting 72 instructions including bit manipulation and indexed addressing. Its System Integration Module (SIM) provides clock generation from internal RC or external crystal oscillator, configurable reset sources (POR, COP, LVI, illegal opcode), and low-power Wait/Stop modes with wake-up via IRQ, KBI, or TIM.
Peripheral integration includes a 10-bit successive-approximation ADC with programmable sample time and conversion trigger options, a flexible Timer Interface Module with two 16-bit channels supporting buffered/unbuffered PWM, and dedicated Keyboard Interrupt Module with debouncing and auto-scan logic for matrix keypad interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 8-bit CISC core with 5-stage pipeline and 72-instruction set |
| FLASH Memory | 4 KB on-chip FLASH with block erase, mass erase, and program capability |
| RAM | 192 bytes of on-chip RAM for data storage and stack operations |
| ADC | 10-bit SAR ADC with 8 input channels, software/hardware trigger, and 12.5 µs conversion time |
| Timer | 16-bit TIM with two independent channels supporting input capture, output compare, and PWM |
| Oscillator | Configurable internal RC or external crystal (1–8 MHz); supports 3 V or 5 V operation |
| Supply Voltage | 2.7–5.5 V DC operating range with Low-Voltage Inhibit (LVI) reset threshold at 2.5 V |
Pinout & Package
MC908JK3EMDWE is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package with 0.300-inch body width and standard JEDEC MS-013AC footprint. Pin spacing is 0.050 inch (1.27 mm), compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power Supply | Main positive supply input (2.7–5.5 V) |
| VSS | Ground | Digital ground reference for all I/O and core logic |
| OSC1 | Clock Input | Crystal amplifier input for external crystal oscillator connection |
| OSC2/PTA6/RCCLK | Clock Output / I/O / RC Clock | Crystal amplifier output; also serves as PTA6 general-purpose I/O or RC oscillator clock source |
| PTA0–PTA5 | Port A I/O | 6-bit bidirectional port with pull-up enable and keyboard interrupt capability |
| PTB0–PTB7 | Port B I/O | 8-bit bidirectional port with data direction control and interrupt-on-change support |
| PTD0–PTD5 | Port D I/O | 6-bit bidirectional port with alternate functions including ADC inputs and TIM signals |
| IRQ | External Interrupt | Active-low edge-triggered external interrupt input (IRQ1) |
| RESET | Reset Input | Active-low hardware reset pin with internal pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM | On-chip 256-byte ROM enabling in-system programming via UART without external programmer |
| Computer Operating Properly (COP) | Configurable watchdog timer with selectable timeout intervals (0.5 ms to 1.0 s) to prevent runaway code |
| Keyboard Interrupt Module (KBI) | Hardware-accelerated matrix keypad scanning with debounce and auto-wake from Stop mode |
| Low-Voltage Inhibit (LVI) | Programmable brown-out detection with reset assertion at 2.5 V to ensure reliable operation during supply dips |
| Power Management | Two low-power modes: Wait (CPU halted, peripherals active) and Stop (all clocks stopped except LVI/COP) |
Applications
| Appliance Motor Control | Industrial Sensor Interface |
|---|---|
Use Scenario: Speed and direction control of small BLDC or stepper motors in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Primary system controller executing closed-loop commutation logic and managing PWM outputs to gate drivers. Use Value: Integrated 16-bit TIM with dual-channel PWM and dead-time insertion support reduces external component count and timing jitter. |
Use Scenario: Signal conditioning and digitization of analog temperature, pressure, or current sensors in factory automation nodes. IC Role / Device Role / Timing Role: Sensor signal acquisition hub with ADC oversampling, digital filtering, and UART telemetry transmission. Use Value: 10-bit ADC with 8 selectable inputs and programmable sample time enables precise multi-sensor monitoring without external MUX. |
| Consumer Keypad Interface | Energy Metering Subsystem |
Use Scenario: Matrix keypad decoding and button state management in thermostats, remote controls, and security panels. IC Role / Device Role / Timing Role: Dedicated KBI peripheral handling scan timing, contact debouncing, and wake-on-keypress from Stop mode. Use Value: Hardware KBI eliminates firmware polling overhead and reduces average current consumption to <1 µA in Stop mode. |
Use Scenario: Pulse counting and tariff switching logic in residential electricity meters with tamper detection. IC Role / Device Role / Timing Role: Real-time event counter and secure configuration manager interfacing with metrology ICs via SPI/I²C. Use Value: COP watchdog and LVI protection ensure meter firmware integrity during voltage transients and power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC908JK1ECDWE | 2 KB FLASH, 128 B RAM, no ADC, same 20-pin SOIC package and peripheral set | Suitable for simpler control tasks without analog sensing; lacks ADC and one TIM channel | Select when system firmware fits within 2 KB and analog inputs are unnecessary |
| MC908JL3ECDWE | 28-pin SOIC, 4 KB FLASH, 192 B RAM, adds UART interface and extra I/O pins | Enables serial communication and expanded I/O for more complex subsystems | Choose when UART connectivity or additional GPIOs are required beyond JK3's 20-pin limit |
Compared with MC908JK3EMDWE, MC908JK1ECDWE offers reduced memory and no ADC - ideal for minimal firmware footprints - while MC908JL3ECDWE extends functionality with UART and pin count, trading compactness for interface flexibility in higher-complexity designs.
Availability
MC908JK3EMDWE is available at Aetrix Electronics and suitable for appliance motor control, industrial sensor interface, consumer keypad interface, and energy metering subsystems requiring stable component supply across long-lifecycle production programs.
Supply support for MC908JK3EMDWE 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 MC908JK3EMDWE belongs to the legacy HCS08 microcontroller family, designed for cost-effective, low-power embedded control in resource-constrained applications where reliability and toolchain maturity are critical.
FAQ
What is the maximum bus frequency supported by the MC908JK3EMDWE?
The MC908JK3EMDWE supports a maximum bus frequency of 8 MHz, achieved using either the internal RC oscillator or an external crystal up to 8 MHz. This frequency determines instruction execution speed and peripheral timing resolution, making it suitable for real-time control loops with sub-millisecond response requirements in the MC908JK3EMDWE design.
Does the MC908JK3EMDWE include a hardware UART interface?
No, the MC908JK3EMDWE does not integrate a hardware UART. Communication is implemented via the Monitor ROM using bit-banged UART on PTA1 (TXD) and PTA0 (RXD) pins, supporting baud rates up to 19.2 kbps. This allows in-system programming and debug without dedicated UART hardware, as defined in the MC908JK3EMDWE technical documentation.
How many analog input channels does the ADC in the MC908JK3EMDWE support?
The MC908JK3EMDWE features a 10-bit successive-approximation ADC with 8 configurable analog input channels mapped to Port D pins (PTD0–PTD5) and Port A pins (PTA2–PTA3). Channel selection is controlled via the ADC Input Select Register, enabling flexible sensor routing without external multiplexing in the MC908JK3EMDWE implementation.
Can the MC908JK3EMDWE operate from a 3 V supply?
Yes, the MC908JK3EMDWE is fully specified for 3 V operation across its functional range (2.7–5.5 V), with validated DC characteristics, timing, and oscillator performance at 3 V. The LVI reset threshold remains fixed at 2.5 V, ensuring robust brown-out protection even under marginal 3 V supply conditions in the MC908JK3EMDWE application.
What packaging options are available for the MC908JK3EMDWE?
The MC908JK3EMDWE is offered exclusively in a 20-pin Small Outline Integrated Circuit (SOIC) package per Freescale's ordering information. It is not available in PDIP, TSSOP, or QFP variants. The SOIC package has a 0.300-inch body width and 1.27 mm lead pitch, matching industry-standard PCB footprints used for the MC908JK3EMDWE.
MC908JK3EMDWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-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:
- LED, LVD, POR, PWM
- Number of I/O:
- 15
- Program Memory Size:
- 4KB (4K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128 x 8
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- A/D 12x8b
- Oscillator Type:
- External
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC908JK3EMDWE FAQ
1.How can I place an order for MC908JK3EMDWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908JK3EMDWE 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 MC908JK3EMDWE reliable?
The price and inventory of MC908JK3EMDWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908JK3EMDWE is usually 5 days.
3.What payment methods are accepted for MC908JK3EMDWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908JK3EMDWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908JK3EMDWE?
MC908JK3EMDWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908JK3EMDWE 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 MC908JK3EMDWE?
For technical support, including MC908JK3EMDWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908JK3EMDWE requirements.
6.How does Aetrix verify that MC908JK3EMDWE is sourced from the original manufacturer or authorized distributors?
All MC908JK3EMDWE 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 MC908JK3EMDWE meets industry standards.
7.What is the process for return or replacement of MC908JK3EMDWE?
All MC908JK3EMDWE units undergo pre-shipment inspection (PSI). If there is an issue with MC908JK3EMDWE, 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 MC908JK3EMDWE part is unused and in its original packaging.
Return procedure for MC908JK3EMDWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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