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NXP Semiconductors MC68908GZ8CFJER
- Part No.:
- MC68908GZ8CFJER
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MC68908GZ8CFJER.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,598
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Product details
Overview
MC68908GZ8CFJER from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring 8 KB Flash memory, 512 B RAM, a 10-bit ADC with 8 channels, integrated MSCAN08 controller, and ESCI/SPI serial interfaces. It operates at up to 8 MHz CPU frequency with on-chip PLL clock generation and supports automotive-grade temperature range (–40°C to +125°C) in a 64-pin LQFP package.
For engineers reviewing the MC68908GZ8CFJER datasheet, MC68908GZ8CFJER pinout, MC68908GZ8CFJER application, or MC68908GZ8CFJER equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in CAN-based vehicle subsystems, and confirmed alternative parts for design continuity and supply resilience.
Technical Context
The MC68908GZ8CFJER implements the HCS08 CPU core with enhanced interrupt handling, low-power wait/stop modes, and hardware COP watchdog. Its Clock Generator Module integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and VCO range selection for stable system clock derivation across voltage and temperature.
The device includes a dedicated MSCAN08 controller compliant with ISO 11898-1 (CAN 2.0A/B), supporting message filtering, transmit/receive FIFOs, and bus-off recovery - all operating independently of the CPU during CAN traffic, enabling deterministic real-time response in automotive body control modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | HCS08 8-bit CPU with 20 MHz max bus speed (8 MHz core @ 2× divider) |
| Memory | 8 KB on-chip Flash (block-erasable, 100k-cycle endurance) + 512 B RAM |
| ADC | 10-bit SAR ADC with 8 input channels, 12.5 µs conversion time, internal reference option |
| CAN Interface | MSCAN08 controller: ISO 11898-1 compliant, 1 Mbit/s max, 16 message buffers, hardware ID filtering |
| Serial Peripherals | ESCI (UART-compatible) + SPI master/slave, both with independent baud rate generators |
| Supply & Temp | 4.5–5.5 V operation; –40°C to +125°C industrial/automotive grade |
| Package | 64-pin LQFP (10 × 10 mm, 0.5 mm pitch), lead-free and RoHS-compliant |
Pinout & Package
MC68908GZ8CFJER is housed in a 64-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, optimized for reflow soldering and thermal dissipation in engine bay and chassis-mounted ECUs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: digital (VDD/VSS) and analog (VDDAD/VSSAD) for noise isolation in mixed-signal operation |
| OSC1/OSC2 | Crystal oscillator inputs | Supports 4–8 MHz fundamental-mode crystals; internal load caps reduce external component count |
| RST | Active-low reset input | Accepts external reset signal; internally pulled up; compatible with open-drain reset supervisors |
| PTE0/TxD, PTE1/RxD | ESCI UART TX/RX | Full-duplex asynchronous communication; supports LIN physical layer via software bit-banging |
| PTC0/CANTX, PTC1/CANRX | CAN transceiver interface | Dedicated differential CAN bus pins with internal pull-ups; require external CAN transceiver (e.g., MC33883) |
| PTD0/SS, PTD1/MOSI, PTD2/MISO, PTD3/SCK | SPI interface signals | Hardware SPI with master/slave mode, programmable polarity/phase, and automatic SS assertion |
Key Features
| Feature | Design Value |
|---|---|
| MSCAN08 Controller | Hardware-accelerated CAN 2.0B messaging with 16-message FIFO, reducing CPU overhead by >70% vs. bit-banged implementations |
| Flash Block Protection | Configurable write/erase protection per 512-byte block enables secure bootloader partitioning and field firmware updates |
| Low-Power Stop Mode | Consumes <1 µA typical current while retaining RAM and wake-on-CAN-interrupt capability for battery-sensitive applications |
| Integrated PLL | Programmable ×1–×32 multiplication with auto-lock detection enables precise clock scaling without external PLL ICs |
| KBI Module | 8-input keyboard interrupt with debounce logic and wake-from-stop support simplifies human-interface designs in dashboard controls |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) Subsystem |
|---|---|
Use Scenario: Centralized management of door locks, lighting, wipers, and HVAC in mid-tier passenger vehicles. IC Role / Device Role / Timing Role: Primary MCU executing CAN message routing, sensor polling (ADC), and actuator PWM control via TIM modules. Use Value: Integrated MSCAN08 eliminates need for external CAN controller; 8 KB Flash accommodates multi-function firmware with diagnostic stack. | Use Scenario: Secondary control node monitoring coolant temperature, oil pressure, and throttle position in distributed engine management systems. IC Role / Device Role / Timing Role: CAN endpoint collecting analog sensor data via 10-bit ADC and forwarding to main ECU over ISO 11898-1 bus. Use Value: –40°C to +125°C rating ensures reliability near engine block; hardware CRC in ESCI improves diagnostic message integrity. |
| Instrument Cluster Display | Commercial Vehicle Telematics Node |
Use Scenario: Real-time rendering of speed, RPM, fuel level, and warning indicators using stepper motor drivers and LED backlighting. IC Role / Device Role / Timing Role: Timing-critical display controller synchronizing SPI-driven graphics buffer updates and CAN-based vehicle data acquisition. Use Value: Dual serial interfaces (ESCI + SPI) enable concurrent CAN diagnostics and display refresh without CPU contention. | Use Scenario: Fleet tracking unit aggregating GPS, accelerometer, and vehicle bus data for remote transmission via cellular modem. IC Role / Device Role / Timing Role: Data concentrator interfacing with CAN bus, ADC sensors, and UART-connected modem using hardware FIFOs. Use Value: Low-power stop mode extends battery life during ignition-off periods; 512 B RAM retains critical trip data across power cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC9S08DZ128 | 128 KB Flash, 8 KB RAM, enhanced CAN FD support, 48 MHz bus speed | Higher memory and performance for complex gateway or ADAS sensor fusion tasks | Select when future firmware expansion or CAN FD migration is required; not pin-compatible |
| S9KEAZ128AMLH | ARM Cortex-M0+, 128 KB Flash, 16 KB RAM, integrated CAN transceiver, 48 MHz | Native CAN PHY reduces BOM cost; modern toolchain and CMSIS support | Choose for new designs targeting long-term roadmap alignment and ecosystem scalability |
Compared with MC9S08DZ128 and S9KEAZ128AMLH, the MC68908GZ8CFJER offers proven automotive qualification and minimal code migration effort for legacy HCS08-based platforms, while trading off memory headroom and CAN FD capability for cost and supply stability in mature production programs.
Availability
MC68908GZ8CFJER is available at Aetrix Electronics and suitable for automotive body electronics, engine subsystem monitoring, instrument cluster control, and commercial telematics requiring stable component supply across extended product lifecycles.
Supply support for MC68908GZ8CFJER 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
Freescale Semiconductor (now part of NXP Semiconductors since 2015) pioneered automotive and industrial microcontrollers with robust qualification, long-term supply commitment, and deep ecosystem support.
The MC68HC908GZ8 family was designed specifically for cost-sensitive, CAN-enabled automotive body electronics where reliability, temperature resilience, and integration of analog peripherals are critical.
FAQ
What is the maximum operating frequency of the MC68908GZ8CFJER?
The MC68908GZ8CFJER features an HCS08 CPU core with a maximum bus frequency of 20 MHz. When using the internal PLL with a 4 MHz crystal and ×5 multiplication, the core runs at 8 MHz (bus at 20 MHz). This configuration is validated across the full –40°C to +125°C temperature range and 4.5–5.5 V supply, making it suitable for under-hood automotive applications where timing margin is critical.
Does the MC68908GZ8CFJER include a built-in CAN transceiver?
No, the MC68908GZ8CFJER integrates the MSCAN08 controller (a CAN protocol engine), but requires an external CAN transceiver such as the MC33883 or TJA1042 for physical layer signaling. Pins PTC0/CANTX and PTC1/CANRX are CMOS-level digital outputs/inputs that connect directly to the transceiver's TXD/RXD lines - not to the CAN bus itself.
How much Flash memory is available on the MC68908GZ8CFJER, and is it field-programmable?
The MC68908GZ8CFJER contains 8 KB of on-chip Flash memory, organized in 512-byte blocks. It supports in-system programming (ISP) via background debug mode (BDM) using standard Freescale tools. Each block can be individually erased and reprogrammed ≥100,000 times, enabling secure bootloader implementation and field firmware updates without removing the MCU from the PCB.
What low-power modes does the MC68908GZ8CFJER support, and what is the typical current draw in Stop mode?
The MC68908GZ8CFJER supports Wait and Stop low-power modes. In Stop mode, typical current consumption is <1 µA at 5 V and 25°C, with RAM retention and wake-up capability via CAN interrupt, IRQ pin, or KBI event. This enables multi-year battery operation in always-on telematics or security modules where periodic CAN bus activity triggers wake-up and data logging.
Is the MC68908GZ8CFJER pin-compatible with the MC68HC908GZ16?
Yes, the MC68908GZ8CFJER is pin-compatible with the MC68HC908GZ16 within the same 64-pin LQFP package. Both share identical pin assignments, electrical characteristics, and peripheral mapping. The primary difference is Flash size (8 KB vs. 16 KB) and minor configuration register defaults - allowing drop-in replacement where firmware fits within the smaller memory footprint.
MC68908GZ8CFJER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-LQFP
- Series:
- HC08
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- HC08
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- CANbus, LINbus, SCI, SPI
- Peripherals:
- LVD, POR, PWM
- Number of I/O:
- 21
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68908GZ8CFJER FAQ
1.How can I place an order for MC68908GZ8CFJER through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68908GZ8CFJER 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 MC68908GZ8CFJER reliable?
The price and inventory of MC68908GZ8CFJER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68908GZ8CFJER is usually 5 days.
3.What payment methods are accepted for MC68908GZ8CFJER?
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4.How is shipping managed for MC68908GZ8CFJER?
MC68908GZ8CFJER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68908GZ8CFJER 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 MC68908GZ8CFJER?
For technical support, including MC68908GZ8CFJER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68908GZ8CFJER requirements.
6.How does Aetrix verify that MC68908GZ8CFJER is sourced from the original manufacturer or authorized distributors?
All MC68908GZ8CFJER 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 MC68908GZ8CFJER meets industry standards.
7.What is the process for return or replacement of MC68908GZ8CFJER?
All MC68908GZ8CFJER units undergo pre-shipment inspection (PSI). If there is an issue with MC68908GZ8CFJER, 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 MC68908GZ8CFJER part is unused and in its original packaging.
Return procedure for MC68908GZ8CFJER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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