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NXP Semiconductors MC68HC908LB8CDWE
- Part No.:
- MC68HC908LB8CDWE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC908LB8CDWE.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,171
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Product details
Overview
MC68HC908LB8CDWE from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 8 KB on-chip FLASH, 512 B RAM, integrated 8-channel 10-bit ADC, dual op-amp/comparator module, and high-resolution PWM (HRP) with dithering and deadtime control - designed for motor control, power conversion, and industrial sensor interface applications.
For engineers reviewing the MC68HC908LB8CDWE datasheet, MC68HC908LB8CDWE pinout, MC68HC908LB8CDWE application, or MC68HC908LB8CDWE equivalent, key selection criteria include its 40-pin SOIC-W package, 8 MHz internal bus clock, low-voltage inhibit (LVI), COP watchdog, and support for Wait/Stop low-power modes in embedded real-time control systems.
Technical Context
The MC68HC908LB8CDWE implements the CPU08 core with 16-bit addressing, supporting up to 64 KB memory space. It integrates a System Integration Module (SIM) managing clock distribution, reset, and interrupt routing across peripherals including HRP, TIM, KBI, IRQ, and ADC.
Its High Resolution PWM (HRP) module provides variable-frequency or variable-duty-cycle operation with programmable dithering and hardware deadtime insertion - critical for synchronous rectification and three-phase motor gate drive timing integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | CPU08 8-bit CISC core with 16-bit address bus and 32+ instructions |
| FLASH Memory | 8 KB on-chip FLASH with block protection, page/mass erase, and in-circuit programming |
| RAM | 512 bytes of on-chip RAM for data and stack storage |
| ADC | 8-channel 10-bit successive-approximation ADC with configurable sample time and interrupt capability |
| HRP Module | High-resolution PWM with 16-bit period/duty registers, frequency/duty dithering, and 0–1023 ns programmable deadtime |
| Operating Voltage | 2.7–5.5 V supply range with Low-Voltage Inhibit (LVI) reset threshold at 2.5 V ±0.1 V |
| Max Bus Clock | 8 MHz internal bus clock derived from internal oscillator or external crystal (1–8 MHz) |
Pinout & Package
MC68HC908LB8CDWE is housed in a 40-pin SOIC-W (Wide-body) package (10.3 mm × 20.0 mm), RoHS-compliant, with 34 general-purpose I/O pins, 2 dedicated reset inputs, and 4 dedicated power/ground terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O rail decoupling; supports mixed-voltage I/O when VDD = 3.3 V or 5 V |
| RESET | Active-low reset input | Asynchronous reset with internal pull-up; triggers cold start and COP timeout recovery |
| IRQ | External interrupt request | Edge-triggered interrupt source with priority over most peripheral interrupts |
| PTA0–PTA7 | Port A bidirectional I/O | 8-bit port with individual direction control; PTA0–PTA3 support KBI wake-up capability |
| PTB0–PTB7 | Port B bidirectional I/O | 8-bit port; PTB0–PTB1 serve as HRP output channels (HRP0/HRP1); PTB2–PTB3 are op-amp/comparator inputs |
| PTC0–PTC7 | Port C bidirectional I/O | 8-bit port; PTC0–PTC7 multiplexed with ADC inputs (AN0–AN7) and TIM channel functions |
| OSC1/OSC2 | Crystal oscillator connection | Supports fundamental-mode quartz crystals (1–8 MHz) or external clock source; internal trimming enables ±2% accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Op-Amp/Comparator | Dual rail-to-rail op-amps with selectable gain and comparator mode - enables analog signal conditioning without external components |
| Computer Operating Properly (COP) | Configurable watchdog timer with 4 selectable timeout periods (0.5 ms to 1.0 s) and disable-on-debug option |
| Low-Power Modes | Wait mode (CPU halted, peripherals active) and Stop mode (all clocks gated except LVI and IRQ edge detection) reduce current to <10 µA |
| Keyboard Interrupt (KBI) | 8-input matrix scan with debounce filtering and wake-from-Stop capability on any enabled pin |
| HRP Deadtime Control | Hardware-inserted non-overlap time (0–1023 ns in 1-ns steps) prevents shoot-through in half-bridge drivers |
Applications
| Brushless DC Motor Control | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Closed-loop commutation of 3-phase BLDC motors using Hall-effect or back-EMF sensing. IC Role / Device Role / Timing Role: Real-time PWM generation with synchronized deadtime, ADC sampling of phase currents, and op-amp-based current sense amplification. Use Value: Eliminates need for external gate drivers and analog front-end ICs; HRP dithering reduces EMI in motor drive switching. |
Use Scenario: Analog signal acquisition and preprocessing in temperature, pressure, or flow transmitters. IC Role / Device Role / Timing Role: ADC digitization of conditioned sensor outputs, on-chip op-amp gain/offset adjustment, and low-power periodic wake-up for battery-powered nodes. Use Value: Reduces BOM count by integrating precision analog blocks and digital control in one 40-pin SOIC device. |
| AC-DC Power Supply Monitoring | Smart Appliance Control Unit |
|
Use Scenario: Real-time monitoring of output voltage/current and thermal status in switch-mode power supplies. IC Role / Device Role / Timing Role: LVI-triggered fault shutdown, ADC-based feedback loop sampling, and COP-guarded firmware execution during transient events. Use Value: Ensures safe shutdown under brownout conditions while maintaining deterministic response latency (<2 µs interrupt latency). |
Use Scenario: User interface and motor actuation control in washing machines, HVAC blowers, or robotic vacuum cleaners. IC Role / Device Role / Timing Role: KBI-driven keypad scanning, HRP-controlled motor speed regulation, and multi-channel ADC reading of thermistors and current shunts. Use Value: Single-chip solution replaces discrete MCU + analog comparator + PWM controller, reducing PCB area and qualification effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8CDTE | RS08 core, 8 KB FLASH, 1 KB RAM, no HRP or op-amps; lower interrupt latency but lacks analog integration | Suitable for simpler control tasks without PWM deadtime or analog signal conditioning requirements | Select when cost sensitivity outweighs need for integrated analog peripherals and advanced PWM features |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+, 128 KB FLASH, 16 KB RAM, 12-bit ADC, 6-channel TPM/PWM - no integrated op-amps | Higher performance, CAN interface, and larger memory for complex firmware; requires external analog front-end | Choose for scalable designs needing future connectivity or computational headroom beyond 8-bit constraints |
Compared with MC68HC908LB8CDWE, MC9RS08KA8CDTE offers lower system cost but sacrifices analog integration and HRP precision, while S9KEAZ128AMLH delivers higher throughput and memory at the expense of increased power and external analog component dependency.
Availability
MC68HC908LB8CDWE is available at Aetrix Electronics and suitable for motor control, power supply supervision, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and legacy design continuity.
Supply support for MC68HC908LB8CDWE 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 deep heritage in 8-bit microcontroller innovation.
The MC68HC908LB8CDWE belongs to the legacy HCS08 family, engineered for cost-sensitive, real-time embedded control where analog integration, low-power operation, and deterministic timing are essential.
FAQ
What is the maximum operating frequency of the MC68HC908LB8CDWE?
The MC68HC908LB8CDWE supports a maximum bus clock frequency of 8 MHz, derived from its internal oscillator (trimmable to ±2%) or an external crystal (1–8 MHz). This determines instruction execution speed, ADC conversion rate, and HRP timing resolution - all calibrated against the bus clock, not core clock.
Does the MC68HC908LB8CDWE support in-system programming (ISP)?
Yes, the MC68HC908LB8CDWE supports in-system programming via its on-chip FLASH memory. It allows full page/mass erase and byte/word programming through background debug mode (BDM) using standard Freescale/NXP tools - enabling field firmware updates without removing the device from the PCB.
How does the HRP module in the MC68HC908LB8CDWE differ from standard PWM modules?
The HRP module in the MC68HC908LB8CDWE provides 16-bit resolution for both period and duty cycle, hardware deadtime insertion (0–1023 ns), and frequency/duty dithering to reduce EMI - features absent in basic PWM peripherals. It operates independently of CPU intervention once configured, ensuring jitter-free output critical for motor gate driving.
Can the op-amp/comparator module in the MC68HC908LB8CDWE drive external loads directly?
No, the op-amp/comparator module in the MC68HC908LB8CDWE is intended for signal conditioning and threshold detection only. Its output is not rated for direct load driving; it must interface with external buffers or comparators if >1 mA output current or rail-to-rail swing into capacitive loads is required.
What low-power modes does the MC68HC908LB8CDWE support, and how do they affect peripheral operation?
The MC68HC908LB8CDWE supports Wait and Stop modes. In Wait mode, the CPU halts but all peripherals remain clocked and functional. In Stop mode, all clocks stop except LVI and IRQ edge detection logic - ADC, HRP, and TIM are disabled until wake-up, reducing current to under 10 µA while retaining RAM and register state.
MC68HC908LB8CDWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 20-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:
- LVR, POR, PWM
- Number of I/O:
- 18
- Program Memory Size:
- 8KB (8K 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 7x8b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908LB8CDWE FAQ
1.How can I place an order for MC68HC908LB8CDWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908LB8CDWE 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 MC68HC908LB8CDWE reliable?
The price and inventory of MC68HC908LB8CDWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908LB8CDWE is usually 5 days.
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MC68HC908LB8CDWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908LB8CDWE 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 MC68HC908LB8CDWE?
For technical support, including MC68HC908LB8CDWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908LB8CDWE requirements.
6.How does Aetrix verify that MC68HC908LB8CDWE is sourced from the original manufacturer or authorized distributors?
All MC68HC908LB8CDWE 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 MC68HC908LB8CDWE meets industry standards.
7.What is the process for return or replacement of MC68HC908LB8CDWE?
All MC68HC908LB8CDWE units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908LB8CDWE, 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 MC68HC908LB8CDWE part is unused and in its original packaging.
Return procedure for MC68HC908LB8CDWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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