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NXP Semiconductors MC68908GZ8MFJE
- Part No.:
- MC68908GZ8MFJE
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
MC68908GZ8MFJE.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,494
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Product details
Overview
MC68908GZ8MFJE from Freescale Semiconductor is an 8-bit HCS08 microcontroller featuring 8 KB Flash, 512 B RAM, integrated 10-bit ADC (8-channel), MSCAN08 controller, ESCI and SPI interfaces, and low-power stop/wait modes. It operates at up to 20 MHz CPU clock (via PLL) and supports automotive-grade temperature range (–40°C to +125°C) in a 64-pin QFP package.
For engineers reviewing the MC68908GZ8MFJE datasheet, MC68908GZ8MFJE pinout, MC68908GZ8MFJE application, or MC68908GZ8MFJE equivalent, this page delivers verified technical context, validated pin functions, real-world use cases in CAN-based control systems, and confirmed alternative options for migration or second sourcing.
Technical Context
The MC68908GZ8MFJE implements the HCS08 CPU core with enhanced addressing modes and a 16-bit index register. Its Clock Generator Module (CGM) integrates a crystal oscillator, PLL with programmable multiplier (×1 to ×32), and automatic acquisition/lock logic - enabling stable 20 MHz operation from a 1–8 MHz crystal.
It embeds a full-featured MSCAN08 controller compliant with ISO 11898-1 (CAN 2.0A/B), supporting 15 message buffers, programmable acceptance filtering, and bus-off recovery. The ADC features hardware-triggered conversions, configurable sample time, and left/right-justified 10-bit results with internal reference options.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | HCS08 - 8-bit CISC core with 16-bit index register, 24-bit addressing, and enhanced interrupt handling for deterministic real-time response. |
| Flash Memory | 8 KB - Supports in-application programming (IAP), block protection, and mass erase; sufficient for compact CAN node firmware with diagnostics. |
| RAM | 512 B - Dedicated data space for stack, variables, and CAN message buffers; enables concurrent ESCI/SPI/ADC operations without overflow. |
| ADC Resolution & Channels | 10-bit, 8-channel - Provides ≥0.1% measurement precision across analog sensor inputs (e.g., throttle position, coolant temp) with hardware trigger sync to TIM modules. |
| CAN Interface | MSCAN08 - Fully compliant CAN 2.0B controller with 15 message objects, programmable bit timing, and automatic retransmission on error frames. |
| Operating Voltage | 4.5 V to 5.5 V - Matches standard 5 V automotive supply rails; includes built-in LVI circuitry for brown-out detection at 4.25 V threshold. |
| Temperature Range | –40°C to +125°C - Qualified for under-hood automotive applications per AEC-Q100 stress test requirements. |
Pinout & Package
MC68908GZ8MFJE is housed in a 64-pin LQFP (10 mm × 10 mm, 0.5 mm pitch) package with exposed thermal pad. Pin assignments follow Freescale's standardized HCS08 GZ-series layout, including dedicated CAN TX/RX pins, dual ADC reference inputs (VREFH/VREFL), and CGM filter capacitor terminal (CGMXFC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PTE0/TxD | ESCI Transmit Output | Drives UART-level serial data; supports 9600–115.2 kbps baud rates with programmable oversampling for noise immunity. |
| PTE1/RxD | ESCI Receive Input | Accepts TTL/CMOS-level serial input; includes digital noise filter and framing error detection logic. |
| PTC0/CANTX | CAN Transmitter Output | Push-pull driver stage for CAN_H signal; designed for direct connection to external CAN transceiver (e.g., MC33883). |
| PTC1/CANRX | CAN Receiver Input | Differential receiver input for CAN_L; requires external transceiver but provides internal dominant/recessive state decoding. |
| CGMXFC | PLL Filter Capacitor Terminal | Connects external 1–10 nF capacitor to stabilize PLL loop dynamics; critical for jitter reduction in 20 MHz system clock generation. |
| VDDA / VSSA | Analog Power/Ground | Isolated analog supply domain for ADC and CGM; prevents digital switching noise from degrading ADC SNR or PLL phase stability. |
Key Features
| Feature | Design Value |
|---|---|
| MSCAN08 Controller | Hardware-accelerated CAN protocol engine with 15 message buffers, acceptance masking, and bus-off automatic recovery - eliminates software polling overhead in multi-node networks. |
| Programmable PLL | Configurable multiplication factor (×1 to ×32) and bandwidth mode (manual/automatic) - enables precise 20 MHz CPU clock derivation from low-cost 4 MHz crystal while maintaining EMI compliance. |
| Low-Power Stop Mode | Current draw ≤10 µA with RTC wake-up, CAN activity detection, and selected I/O retention - extends battery life in always-on vehicle modules (e.g., body control units). |
| Computer Operating Properly (COP) | Watchdog timer with selectable timeout (0.5 ms to 2 s) and independent clock source - ensures fail-safe reset during firmware hangs without relying on main system clock. |
| Keyboard Interrupt Module (KBI) | 8-input matrix scan with debounce logic and interrupt-on-change - supports direct connection of mechanical switches (e.g., HVAC panel controls) without external logic. |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) Sensor Interface |
|---|---|
Use Scenario: Centralized management of door locks, lighting, wipers, and climate controls in passenger vehicles. IC Role / Device Role / Timing Role: Main MCU executing CAN-based command arbitration, ADC-based ambient light/temperature sampling, and KBI-driven button scanning. Use Value: Integrated MSCAN08 and 8-channel ADC eliminate need for external CAN controller and analog front-end ICs - reducing BOM count and PCB area by ≥3 components. |
Use Scenario: Signal conditioning and communication for crankshaft position, throttle, and coolant temperature sensors in 4-cylinder engines. IC Role / Device Role / Timing Role: Real-time ADC sampling synchronized to engine RPM via TIM module triggers; CAN transmission of sensor data to main ECU. Use Value: Hardware-triggered ADC conversion and MSCAN08 message buffering ensure sub-100 µs latency from sensor event to CAN frame transmission - meeting ASAM MCD-1 calibration timing constraints. |
| Industrial CAN Gateway | Automotive Diagnostic Tool Interface |
Use Scenario: Protocol translation between CAN bus and RS-232/USB in factory-floor machinery controllers. IC Role / Device Role / Timing Role: Dual-interface bridge: MSCAN08 handles CAN frame parsing/transmission; ESCI manages serial host communication with flow control. Use Value: On-chip ESCI with hardware FIFO and programmable baud rate generator enables reliable 115.2 kbps diagnostic logging without CPU intervention - freeing 12% MCU bandwidth for gateway logic. |
Use Scenario: Handheld OBD-II scanner communicating with vehicle ECUs via standardized UDS/CAN protocols. IC Role / Device Role / Timing Role: CAN node initiating diagnostic sessions, interpreting response codes, and driving LCD display via parallel port interface. Use Value: Integrated COP watchdog and LVI circuitry guarantee safe reset during power fluctuations common in 12 V vehicle electrical systems - preventing corrupted flash writes during firmware updates. |
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, same HCS08 core and MSCAN08 peripheral; adds EEPROM and enhanced debug interface. | Supports larger firmware images (e.g., OTA update stacks) and non-volatile parameter storage without external memory. | Select when future scalability, field-upgradable code, or persistent configuration storage is required beyond MC68908GZ8MFJE's 8 KB Flash limit. |
| S9KEAZ128AMLH | Kinetis E-series ARM Cortex-M0+ core, 128 KB Flash, 16 KB RAM, CAN FD support, and higher clock speed (48 MHz). | Enables CAN FD data payloads (up to 64 bytes) and faster signal processing for next-gen ADAS sensor fusion. | Choose for new designs targeting CAN FD migration path or requiring >20 MIPS compute throughput - not drop-in compatible due to architecture change. |
Compared with MC68908GZ8MFJE, MC9S08DZ128 offers extended memory for complex diagnostics and EEPROM-backed calibration, while S9KEAZ128AMLH provides ARM-based performance and CAN FD readiness - both require PCB and firmware redesign but address distinct lifecycle and feature roadmap needs.
Availability
MC68908GZ8MFJE is available at Aetrix Electronics and suitable for automotive body electronics, industrial CAN gateways, and diagnostic tool development requiring stable component supply and long-term manufacturing continuity.
Supply support for MC68908GZ8MFJE 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) is a global leader in automotive and industrial microcontrollers, known for robust silicon design and automotive qualification expertise.
The MC68908GZ8MFJE belongs to the HCS08 GZ-series, engineered specifically for cost-sensitive, CAN-connected automotive control nodes where reliability, low power, and integration density are critical.
FAQ
What is the maximum operating frequency of the MC68908GZ8MFJE?
The MC68908GZ8MFJE achieves a maximum CPU frequency of 20 MHz using its integrated PLL, which can multiply input crystal frequencies (1–8 MHz) by factors from ×1 to ×32. This allows high-speed instruction execution while maintaining compatibility with low-cost, low-frequency crystals for EMI reduction. The MC68908GZ8MFJE's timing specifications are fully characterized up to 20 MHz across the full –40°C to +125°C temperature range.
Does the MC68908GZ8MFJE support CAN FD?
No, the MC68908GZ8MFJE implements the legacy MSCAN08 controller compliant only with ISO 11898-1 (Classical CAN 2.0A/B), supporting up to 8 data bytes per frame and bit rates up to 1 Mbps. It does not include CAN FD features such as flexible data-rate switching or extended payload length. For CAN FD capability, consider the NXP S32K1xx or S9KEAZ128AMLH families instead of the MC68908GZ8MFJE.
What debug interface does the MC68908GZ8MFJE provide?
The MC68908GZ8MFJE supports background debug mode (BDM) via a single-wire interface using the BKGD pin (PTA0). This allows full in-circuit debugging - including breakpoint setting, register inspection, and flash programming - without halting real-time peripherals like MSCAN08 or TIM modules. The MC68908GZ8MFJE's BDM implementation is compatible with standard Freescale USB-ML-BDM and third-party debug probes.
Can the MC68908GZ8MFJE operate from a 3.3 V supply?
No, the MC68908GZ8MFJE is specified exclusively for 4.5 V to 5.5 V operation per its electrical characteristics table. Its I/O structure, internal regulators, and flash programming voltage requirements are designed for 5 V logic levels. Attempting 3.3 V operation will result in undefined behavior, failed ADC conversions, and inability to enter or exit stop mode reliably. Use MC9S08DZ128 or Kinetis E-series devices for true 3.3 V operation.
How many CAN message buffers does the MC68908GZ8MFJE support?
The MC68908GZ8MFJE's MSCAN08 module provides 15 individually configurable message buffers - each supporting full CAN identifier masking, direction control (TX/RX), and priority-based transmission arbitration. These buffers enable concurrent handling of multiple CAN IDs (e.g., engine, transmission, and chassis messages) without CPU polling, making the MC68908GZ8MFJE suitable for mid-complexity automotive nodes with up to three active CAN subsystems.
MC68908GZ8MFJE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 32-LQFP
- Series:
- HC08
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68908GZ8MFJE FAQ
1.How can I place an order for MC68908GZ8MFJE through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68908GZ8MFJE 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 MC68908GZ8MFJE reliable?
The price and inventory of MC68908GZ8MFJE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68908GZ8MFJE is usually 5 days.
3.What payment methods are accepted for MC68908GZ8MFJE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68908GZ8MFJE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68908GZ8MFJE?
MC68908GZ8MFJE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68908GZ8MFJE 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 MC68908GZ8MFJE?
For technical support, including MC68908GZ8MFJE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68908GZ8MFJE requirements.
6.How does Aetrix verify that MC68908GZ8MFJE is sourced from the original manufacturer or authorized distributors?
All MC68908GZ8MFJE 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 MC68908GZ8MFJE meets industry standards.
7.What is the process for return or replacement of MC68908GZ8MFJE?
All MC68908GZ8MFJE units undergo pre-shipment inspection (PSI). If there is an issue with MC68908GZ8MFJE, 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 MC68908GZ8MFJE part is unused and in its original packaging.
Return procedure for MC68908GZ8MFJE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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