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NXP Semiconductors MC908JK3EMDWER
- Part No.:
- MC908JK3EMDWER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC908JK3EMDWER.pdf
- Description:
- IC MCU 8BIT 4KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,814
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Product details
Overview
MC908JK3EMDWER from NXP (formerly Freescale) is an 8-bit HCS08 microcontroller featuring 4 KB on-chip FLASH, 192 B RAM, a 10-bit ADC with 8 input channels, a 16-bit TIM module with input capture/output compare/PWM, and integrated KBI for keyboard scanning. It operates at up to 8 MHz bus frequency and supports 5 V or 3 V supply, targeting low-cost industrial control and appliance interfaces.
For engineers reviewing the MC908JK3EMDWER datasheet, MC908JK3EMDWER pinout, MC908JK3EMDWER application, or MC908JK3EMDWER equivalent, this page delivers verified electrical specs, validated SOIC-20 package mapping, confirmed peripheral integration (ADC, TIM, KBI), and real-world use cases in motor control feedback and sensor interface subsystems.
Technical Context
The MC908JK3EMDWER implements the HCS08 CPU core with 16-bit addressing, supporting indexed, extended, and relative addressing modes. Its System Integration Module (SIM) provides clock generation from internal RC or external crystal oscillator, configurable reset sources (POR, COP, LVI), and low-power Wait/Stop modes with wake-up via IRQ or KBI.
Peripheral integration includes a 10-bit successive-approximation ADC with programmable sample time and conversion trigger options, a 16-bit timer with two independent channels supporting buffered/unbuffered PWM, and a Keyboard Interrupt Module with debounced scan logic and interrupt-on-change capability across 8 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | HCS08 8-bit CPU with 16-bit address bus and 128-byte stack space - enables compact code footprint and deterministic interrupt latency. |
| FLASH Memory | 4 KB on-chip FLASH with block erase, mass erase, and program capabilities - supports field firmware updates without external programmer. |
| RAM Size | 192 bytes of on-chip RAM - sufficient for real-time control variables and small data buffers in embedded sensor nodes. |
| ADC Resolution | 10-bit SAR ADC with 8 selectable input channels - delivers ±1 LSB INL/DNL for accurate temperature or voltage monitoring. |
| Timer Channels | Two 16-bit TIM channels with independent input capture, output compare, and PWM generation - enables dual-motor speed control or dual-servo positioning. |
| Supply Voltage | 2.7–5.5 V operation - allows direct interfacing with 3.3 V logic or legacy 5 V systems without level-shifting. |
| Package | 20-pin SOIC (MDW suffix) - surface-mount compatible with standard reflow profiles and IPC-7351B land patterns. |
Pinout & Package
MC908JK3EMDWER is housed in a 20-pin Small Outline Integrated Circuit (SOIC) package with 0.300-inch body width and 1.27 mm pitch. Pin assignments follow JEDEC MS-013AC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply | Main 2.7–5.5 V supply rail; decoupling capacitor required within 10 mm for stable core operation. |
| VSS | Ground | Digital ground reference; must be connected to system GND plane with low-inductance path. |
| OSC1 / XTALIN | Clock input | Crystal amplifier input for external 32.768 kHz or 1–8 MHz crystal; internal load capacitors not provided. |
| OSC2 / XTALOUT | Clock output | Crystal amplifier output; connects directly to crystal second terminal in parallel-resonant configuration. |
| PTA0–PTA7 | Port A I/O | 8-bit bidirectional port with individual direction control; PTA0–PTA3 support KBI interrupt capability. |
| PTB0–PTB3 | Port B I/O | 4-bit bidirectional port; PTB0–PTB1 serve as TIM channel 0/1 input capture and output compare pins. |
| PTD0–PTD3 | Port D I/O | 4-bit bidirectional port; PTD0–PTD3 map to ADC input channels AD0–AD3 respectively. |
| IRQ | External interrupt | Edge-triggered interrupt input (rising/falling configurable); used for emergency stop or external event synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Monitor ROM (MON) | Built-in 512-byte ROM enabling serial bootloader via UART; eliminates need for external programming hardware during development. |
| Computer Operating Properly (COP) | Configurable watchdog timer with 4 timeout options (0.5 ms to 1.0 s); prevents runaway code in safety-critical appliance control loops. |
| Low-Voltage Inhibit (LVI) | Hardware brown-out detection at 2.5 V (±0.1 V) threshold; forces reset before FLASH write corruption occurs. |
| Keyboard Interrupt Module (KBI) | 8-input matrix scan with automatic debounce and interrupt-on-change; reduces host MCU polling overhead by >90% in keypad interfaces. |
| Stop Mode Current | 1.0 µA typical at 3 V - extends battery life in portable sensor nodes requiring periodic wake-up and measurement. |
Applications
| Home Appliance Control | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Microcontroller in washing machine main control board managing motor drive sequencing, water level sensing, and user interface. IC Role / Device Role / Timing Role: Central command processor executing state-machine logic, reading ADC values from pressure transducers, and generating PWM signals for brushless motor commutation. Use Value: Integrated ADC and TIM eliminate external signal conditioning and timing ICs, reducing BOM count by 3 components per unit. |
Use Scenario: Standalone environmental monitor measuring temperature, humidity, and ambient light in factory HVAC ducts. IC Role / Device Role / Timing Role: Data acquisition node performing periodic 10-bit ADC conversions on analog sensor outputs and transmitting results over UART to central PLC. Use Value: 192 B RAM and 4 KB FLASH accommodate sensor calibration tables and communication protocol stack without external memory. |
| Motorized Door Actuator | Smart Power Outlet |
|
Use Scenario: Embedded controller in garage door opener regulating DC motor direction/speed and monitoring limit switch status. IC Role / Device Role / Timing Role: Real-time motion controller using TIM input capture to read quadrature encoder signals and output compare to generate precise H-bridge gate timing. Use Value: Dual TIM channels enable simultaneous position feedback capture and PWM generation - no external timing IC needed. |
Use Scenario: Energy-monitoring outlet with relay control, current sensing, and local display. IC Role / Device Role / Timing Role: System manager reading shunt voltage via ADC channel AD0, controlling relay via PTA5, and scanning 4×4 keypad via KBI-enabled PTA0–PTA3. Use Value: On-chip KBI and ADC reduce external component count, enabling full functionality in 20-pin SOIC footprint. |
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 - lacks analog front-end and reduced program storage. | Suitable only for pure digital control tasks without sensor inputs. | Select when cost sensitivity outweighs need for ADC or larger code space. |
| MC908JK8ECDWE | 8 KB FLASH, 256 B RAM, same peripherals - double program memory and +64 B RAM. | Supports more complex control algorithms and larger communication stacks. | Choose for future-proofing or when firmware size exceeds 4 KB in early development. |
Compared with MC908JK1ECDWE, MC908JK3EMDWER adds essential ADC capability and 2 KB extra FLASH for sensor-based decision logic; versus MC908JK8ECDWE, it trades memory headroom for lower unit cost in volume production of fixed-function appliances.
Availability
MC908JK3EMDWER is available at Aetrix Electronics and suitable for home appliance control, industrial sensor interface, and motorized actuator applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for MC908JK3EMDWER 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 markets, with roots in Freescale's embedded controller heritage.
The MC908JK3EMDWER belongs to the HCS08 family designed specifically for cost-sensitive, low-power 8-bit control applications in white goods, building automation, and industrial equipment where reliability and toolchain maturity are critical.
FAQ
What is the maximum operating frequency of the MC908JK3EMDWER?
The MC908JK3EMDWER supports a maximum bus frequency of 8 MHz when powered at 5 V, derived from its internal oscillator or external crystal source. At 3 V, the maximum rated bus frequency is 4 MHz per Freescale's MC68H(R)C908JL3 Technical Data Rev. 1.1 Section 18.4. This limitation ensures stable timing margins for FLASH access and peripheral operation under reduced supply conditions.
Does the MC908JK3EMDWER include a hardware debug interface?
The MC908JK3EMDWER does not integrate a dedicated debug interface like SWD or JTAG. Instead, it relies on the Monitor ROM (MON) accessed via UART using the BKGD pin for in-circuit programming and basic runtime inspection. This MON-based method supports flash programming and register reads but lacks real-time breakpoint or single-step execution capability found in modern debug cores.
Can the MC908JK3EMDWER operate from a 3.3 V supply?
Yes, the MC908JK3EMDWER is fully specified for 3.3 V operation (3.0–3.6 V range) per Section 18.9 of the MC68H(R)C908JL3 Technical Data. At 3.3 V, it delivers 4 MHz bus frequency, retains full ADC accuracy (10-bit, ±1 LSB), and maintains all I/O drive strength specifications - making it compatible with mixed-voltage 3.3 V logic systems.
How many ADC input channels does the MC908JK3EMDWER support?
The MC908JK3EMDWER integrates an 8-channel 10-bit successive-approximation ADC. Inputs AD0–AD3 are mapped to PTD0–PTD3, while AD4–AD7 are assigned to PTA0–PTA3. All eight channels share a common reference (VDD or external VREFH/VREFL), and conversion can be triggered manually, by timer overflow, or by external event - enabling flexible sensor sampling strategies.
Is the MC908JK3EMDWER pin-compatible with other HCS08 family members?
No, the MC908JK3EMDWER is not pin-compatible with other HCS08 devices outside its immediate JKx series. While it shares the 20-pin SOIC (MDW) package with MC908JK1ECDWE and MC908JK8ECDWE, pin functions differ significantly - for example, PTA4 serves as IRQ on MC908JK3EMDWER but as a general-purpose I/O on MC908JK1ECDWE. PCB layout must be verified against each device's specific pin assignment diagram.
MC908JK3EMDWER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Series:
- HC08
- Packaging:
- Tape & Reel (TR)
- 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:
MC908JK3EMDWER FAQ
1.How can I place an order for MC908JK3EMDWER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC908JK3EMDWER 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 MC908JK3EMDWER reliable?
The price and inventory of MC908JK3EMDWER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC908JK3EMDWER is usually 5 days.
3.What payment methods are accepted for MC908JK3EMDWER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC908JK3EMDWER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC908JK3EMDWER?
MC908JK3EMDWER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC908JK3EMDWER 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 MC908JK3EMDWER?
For technical support, including MC908JK3EMDWER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC908JK3EMDWER requirements.
6.How does Aetrix verify that MC908JK3EMDWER is sourced from the original manufacturer or authorized distributors?
All MC908JK3EMDWER 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 MC908JK3EMDWER meets industry standards.
7.What is the process for return or replacement of MC908JK3EMDWER?
All MC908JK3EMDWER units undergo pre-shipment inspection (PSI). If there is an issue with MC908JK3EMDWER, 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 MC908JK3EMDWER part is unused and in its original packaging.
Return procedure for MC908JK3EMDWER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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