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NXP Semiconductors MC68HC908LB8MDWE
- Part No.:
- MC68HC908LB8MDWE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MC68HC908LB8MDWE.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,629
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Product details
Overview
MC68HC908LB8MDWE from NXP (formerly Freescale) is an 8-bit HCS08-core microcontroller with 8 KB on-chip FLASH, 512 B RAM, integrated 10-bit ADC, dual op-amp/comparator, high-resolution PWM (HRP), and low-voltage inhibit (LVI). It operates at up to 8 MHz bus frequency and targets embedded motor control, industrial sensing, and appliance timing applications.
For engineers reviewing the MC68HC908LB8MDWE datasheet, MC68HC908LB8MDWE pinout, MC68HC908LB8MDWE application, or MC68HC908LB8MDWE equivalent, key selection criteria include its HRP deadtime insertion capability, on-die analog signal conditioning, COP watchdog reliability, and support for stop/wait low-power modes in battery-constrained systems.
Technical Context
The MC68HC908LB8MDWE implements the CPU08 core with 16-bit addressing, supporting indexed, extended, and relative addressing modes. Its memory map includes 8 KB of user-programmable FLASH with block protection and a 512-byte RAM section with dedicated stack pointer.
It integrates a 10-bit successive-approximation ADC with 8 input channels, programmable conversion time, and interrupt-on-complete capability. The High Resolution PWM (HRP) module provides dithering-controlled variable-frequency/variable-duty-cycle outputs with configurable deadtime insertion for half-bridge gate drive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | CPU08 8-bit CISC core with 16-bit address bus and 32-instruction cycle minimum execution time |
| FLASH Memory | 8 KB on-chip FLASH with page/mass erase, block protection, and 100K write/erase cycles endurance |
| RAM Size | 512 bytes of on-chip RAM with dedicated stack pointer and fast access for real-time ISR handling |
| ADC Resolution | 10-bit SAR ADC with 8 selectable input channels, ±1 LSB integral nonlinearity, and software-triggered conversion |
| HRP Outputs | Two complementary PWM outputs with programmable deadtime (0–15.5 µs in 0.5 µs steps) for synchronous half-bridge control |
| Operating Voltage | 2.7 V to 5.5 V supply range with LVI reset threshold at 2.55 V ±0.1 V and hysteresis for noise immunity |
| Max Bus Frequency | 8 MHz internal bus clock derived from internal oscillator or external crystal, enabling deterministic real-time response |
Pinout & Package
MC68HC908LB8MDWE is housed in a 28-pin SOIC (Small Outline Integrated Circuit) package with 24 I/O pins, including dedicated analog inputs, PWM outputs, and interrupt-capable GPIO.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power Supply / Ground | Primary power rails; decoupling required within 1 cm for stable ADC and PWM operation |
| PA0–PA7 | Port A I/O | 8-bit bidirectional port; PA0–PA3 serve as ADC inputs and KBI inputs; PA4–PA7 support HRP output functions |
| PTA0–PTA3 | Port T I/O | 4-bit port with IRQ, COPCLK, and oscillator connections; PTA0/PTA1 are crystal inputs (XTAL/EXTAL) |
| HRP0A/HRP0B | High-Resolution PWM Outputs | Complementary PWM pair with hardware-inserted deadtime; used for driving external MOSFET half-bridges |
| OPAMP1+/−, OPAMP2+/− | Analog Input Terminals | Dedicated differential inputs for two rail-to-rail op-amps; configurable as comparators or amplifiers with internal feedback options |
Key Features
| Feature | Design Value |
|---|---|
| High-Resolution PWM (HRP) | Supports dithering-based EMI reduction and precise deadtime control (0.5 µs resolution) for motor gate drivers |
| Integrated Analog Front-End | Dual op-amp/comparator with selectable gain and internal reference enables sensor signal conditioning without external components |
| Computer Operating Properly (COP) | Configurable watchdog timer with 4 timeout options (0.5 ms to 1.0 s) and COP disable via CONFIG register |
| Low-Voltage Inhibit (LVI) | Hardware reset generator with 2.55 V threshold and 100 mV hysteresis prevents erratic operation during brownout conditions |
| Stop/Wait Low-Power Modes | Stop mode draws ≤1 µA; Wait mode retains RAM and peripheral clocks while halting CPU - ideal for wake-on-keyboard or wake-on-IRQ |
Applications
| Brushless DC Motor Control | Industrial Temperature Sensor Node |
|---|---|
|
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 current/voltage feedback, and COP-protected firmware execution. Use Value: Eliminates need for external gate driver ICs and analog comparator chips; reduces BOM count by integrating HRP, op-amps, and ADC. |
Use Scenario: Battery-powered wireless temperature monitoring in HVAC ducts or factory equipment enclosures. IC Role / Device Role / Timing Role: Low-power data acquisition node performing periodic ADC reads, analog signal amplification, and wake-on-interrupt transmission. Use Value: Stop-mode current ≤1 µA extends battery life; integrated LVI ensures reliable reset during voltage sag from cold-start transients. |
| Smart Appliance Timer Module | LED Dimming Controller |
|
Use Scenario: Precision timing and user interface management in microwave ovens, washing machines, and dishwashers. IC Role / Device Role / Timing Role: Keyboard interrupt handling (KBI), real-time countdown via TIM, and fault-safe operation via COP and LVI. Use Value: Single-chip solution replaces discrete 555 timers, shift registers, and watchdog ICs; supports 24-pin SOIC footprint for compact PCB layout. |
Use Scenario: Constant-current dimming of high-brightness LEDs in architectural lighting and signage. IC Role / Device Role / Timing Role: HRP-driven MOSFET switching with dithering to suppress audible noise and EMI; op-amp feedback for current-sense regulation. Use Value: Dithering-enabled HRP avoids fixed-frequency harmonics; integrated analog front-end removes need for external op-amp and reference ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9RS08KA8CFD | RS08 core, 8 KB FLASH, no integrated op-amps or HRP; uses simpler PWM and lacks deadtime insertion | Suitable for cost-sensitive timer-only applications but cannot replace MC68HC908LB8MDWE in analog-conditioning or half-bridge control roles | Select when analog integration and precise deadtime are unnecessary and legacy HCS08 toolchain compatibility is not required |
| MC9S08QG8CDTE | S08 core, 8 KB FLASH, 512 B RAM, but no op-amps/comparators and only standard PWM (no HRP or dithering) | Applicable for basic I/O and timing tasks; lacks the analog signal chain and EMI-optimized PWM needed for motor/sensor edge cases | Choose for migration paths requiring S08 instruction set compatibility, but verify absence of HRP and op-amp functionality in design |
Compared with MC9RS08KA8CFD and MC9S08QG8CDTE, the MC68HC908LB8MDWE uniquely delivers co-located analog front-end, dithering-capable HRP, and hardware deadtime - making it irreplaceable in designs requiring integrated motor gate drive or precision sensor signal conditioning without external components.
Availability
MC68HC908LB8MDWE is available at Aetrix Electronics and suitable for industrial motor control, smart appliance timing, and battery-powered sensor node applications requiring stable component supply and long-term lifecycle support.
Supply support for MC68HC908LB8MDWE 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.
The MC68HC908LB8MDWE belongs to the legacy HCS08 microcontroller family, designed specifically for cost-sensitive, analog-intensive embedded control applications where integration of PWM, ADC, op-amps, and safety features reduces system-level complexity.
FAQ
What is the maximum operating frequency of the MC68HC908LB8MDWE?
The MC68HC908LB8MDWE supports a maximum bus frequency of 8 MHz. This clock is derived either from the internal oscillator (trimmed to ±2% accuracy) or an external crystal connected to PTA0/PTA1. The CPU08 core executes instructions at this bus rate, enabling deterministic real-time performance for motor control loops and sensor sampling intervals.
Does the MC68HC908LB8MDWE include hardware debug support?
The MC68HC908LB8MDWE supports single-wire background debug mode (BDM) via the BKGD pin, allowing full read/write access to memory and registers during runtime. This enables non-intrusive debugging, flash programming, and real-time variable inspection without requiring additional JTAG hardware - critical for field firmware updates and validation of timing-critical code in the MC68HC908LB8MDWE.
Can the op-amps in the MC68HC908LB8MDWE be configured as comparators?
Yes, the two integrated op-amps in the MC68HC908LB8MDWE can be independently configured as comparators via the OPCTL register. Each op-amp's output connects to a dedicated digital I/O pin (e.g., PTB0/PTB1), enabling zero-crossing detection, overvoltage monitoring, or window-comparator functions without external components - a key capability confirmed in Section 4.4 of the MC68HC908LB8MDWE datasheet.
What low-power modes does the MC68HC908LB8MDWE support?
The MC68HC908LB8MDWE supports two hardware low-power modes: Wait mode (CPU halted, peripherals active, RAM retained) and Stop mode (all clocks stopped except LVI, RAM retention optional, current ≤1 µA). Both modes are entered via STOP or WAIT instructions and exited by interrupts or reset - essential for extending battery life in portable MC68HC908LB8MDWE-based sensor nodes.
Is the MC68HC908LB8MDWE pin-compatible with other HCS08 devices?
No, the MC68HC908LB8MDWE is not pin-compatible with other HCS08-family MCUs such as the MC68HC908QT4 or MC68HC908JK3. Its 28-pin SOIC package and specific pin assignments - including dual HRP outputs, op-amp terminals, and dedicated KBI/IRQ lines - are unique to the LB8 variant. Board layout must be designed specifically for the MC68HC908LB8MDWE footprint.
MC68HC908LB8MDWE 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68HC908LB8MDWE FAQ
1.How can I place an order for MC68HC908LB8MDWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68HC908LB8MDWE 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 MC68HC908LB8MDWE reliable?
The price and inventory of MC68HC908LB8MDWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68HC908LB8MDWE is usually 5 days.
3.What payment methods are accepted for MC68HC908LB8MDWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68HC908LB8MDWE transactions.
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MC68HC908LB8MDWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68HC908LB8MDWE 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 MC68HC908LB8MDWE?
For technical support, including MC68HC908LB8MDWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68HC908LB8MDWE requirements.
6.How does Aetrix verify that MC68HC908LB8MDWE is sourced from the original manufacturer or authorized distributors?
All MC68HC908LB8MDWE 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 MC68HC908LB8MDWE meets industry standards.
7.What is the process for return or replacement of MC68HC908LB8MDWE?
All MC68HC908LB8MDWE units undergo pre-shipment inspection (PSI). If there is an issue with MC68HC908LB8MDWE, 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 MC68HC908LB8MDWE part is unused and in its original packaging.
Return procedure for MC68HC908LB8MDWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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