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NXP Semiconductors MC68331MEH16
- Part No.:
- MC68331MEH16
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 132-BQFP Bumpered
- Datasheet:
-
MC68331MEH16.pdf
- Description:
- IC MCU 32BIT ROMLESS 132PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,792
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Product details
Overview
MC68331MEH16 from Freescale Semiconductor is a 32-bit modular microcontroller integrating CPU32 core, System Integration Module (SIM), General-Purpose Timer (GPT), and Queued Serial Module (QSM). It operates at 16 MHz system clock, supports −40°C to +125°C industrial temperature range, and features fully static operation with low-power STOP mode. It targets embedded control systems requiring deterministic real-time response, such as motor drive supervision and industrial PLC I/O modules.
For engineers reviewing the MC68331MEH16 datasheet, MC68331MEH16 pinout, MC68331MEH16 application, or MC68331MEH16 equivalent, key selection criteria include its 132-pin PQFP package, 24-bit address/16-bit data bus, integrated watchdog and bus monitor, QSPI/SCI dual-serial capability, and hardware breakpoint support for background debugging.
Technical Context
The MC68331MEH16 implements a modular architecture using an Intermodule Bus (IMB) with 24 address and 16 data lines, enabling standardized communication between CPU32, SIM, GPT, and QSM. Its SIM provides programmable chip selects (CS0–CS10), external bus interface, periodic interrupt generation, and system protection logic including software watchdog and bus monitor.
CPU32 delivers upward object-code compatibility with enhanced controller instructions, virtual memory support, loop mode execution, and trace-on-change-of-flow. The GPT includes two 16-bit free-running counters, three input capture channels, four output compare channels, and two PWM outputs-enabling precise timing, event counting, and motor control waveform generation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | CPU32 32-bit RISC-like core with full static operation and supervisor/user privilege levels |
| Max System Clock | 16 MHz - fixed frequency grade for deterministic timing in safety-critical control loops |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and high-ambient industrial environments |
| Memory Interface | 24-bit address bus / 16-bit data bus - supports up to 16 MB external memory with programmable chip selects |
| Integrated Peripherals | SIM (system config/protection), GPT (timer/PWM/capture), QSM (QSPI + SCI) - eliminates need for discrete support ICs |
| Debug Support | Background Debug Mode via DSI/DSO/DSCLK pins - enables non-intrusive real-time code inspection and breakpoint triggering |
| Power Management | LPSTOP instruction halts clock while preserving register and RAM state - reduces active power to µA-level standby |
Pinout & Package
MC68331MEH16 is housed in a 132-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch, designed for surface-mount reflow assembly and thermal reliability in extended temperature applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADDR[23:0] | Address Bus Output | 24-bit multiplexed address for external memory and peripheral mapping; supports 16 MB address space |
| DATA[15:0] | Data Bus Bidirectional | 16-bit parallel data path for read/write transfers; synchronized during reset only |
| RESET | Active-Low Reset Input/Output | Asynchronous system reset initiation and reset status indication; open-drain capable |
| PQS0/MISO | QSM Serial Data I/O | Master In Slave Out in QSPI master mode; serial input to SCI; shared with general-purpose port QS |
| PGP0/IC1 | GPT Input Capture Channel 1 | Dedicated edge-triggered input for latching timer value on external event (e.g., encoder phase A) |
| PF0/MODCLK | System Clock Mode Select | Configures clock source: internal synthesizer (32.768 kHz crystal) or external clock input |
| PE0/DSACK0 | Data Strobe Acknowledge | Enables asynchronous bus cycles and dynamic bus sizing; critical for interfacing with legacy peripherals |
Key Features
| Feature | Design Value |
|---|---|
| Modular IMB Architecture | Standardized interconnect between CPU32, SIM, GPT, and QSM enables predictable timing and scalable peripheral integration |
| Hardware Watchdog & Bus Monitor | Integrated fault detection logic resets MCU on bus hang or software lockup - no external watchdog IC required |
| Queued Serial Peripheral Interface (QSPI) | 80-byte FIFO and auto-transfer queue enable burst SPI communication without CPU intervention - ideal for sensor arrays |
| Input Capture / Output Compare Flexibility | Five independent GPT channels configurable as input capture (IC1–IC4), output compare (OC1–OC5), or PWM - supports multi-axis motion control |
| Background Debug Mode (BDM) | Three-wire serial debug interface (DSI/DSO/DSCLK) allows live register inspection and breakpoint insertion without halting real-time tasks |
Applications
| Industrial Motor Control | Automotive Body Controller |
|---|---|
|
Use Scenario: Closed-loop brushless DC motor commutation with Hall-effect feedback and current sensing. IC Role / Device Role / Timing Role: MC68331MEH16 serves as the primary motion controller, executing PID loops, generating six-step PWM waveforms via PWMA/PWMB, and capturing rotor position via IC1–IC3. Use Value: Integrated GPT with input capture and PWM outputs eliminates external timer ICs and reduces PCB footprint by 30% versus discrete solutions. |
Use Scenario: Central body control unit managing door locks, window lifters, mirror adjustment, and interior lighting. IC Role / Device Role / Timing Role: MC68331MEH16 acts as the main supervisory MCU, coordinating LIN/SCI communications, monitoring switch inputs via PORTF, and driving relays through OC1–OC4 outputs. Use Value: On-chip QSM SCI supports LIN 1.3 protocol at 19.2 kbps with automatic baud rate detection - simplifies compliance testing and reduces firmware overhead. |
| Programmable Logic Controller (PLC) I/O Module | Energy Metering Front-End |
|
Use Scenario: DIN-rail mounted digital I/O expansion module with 16-channel isolated inputs and 8-channel relay outputs. IC Role / Device Role / Timing Role: MC68331MEH16 functions as the local intelligence node, scanning opto-isolated inputs via PORTC, debouncing in hardware using GPT pulse accumulator, and updating outputs via PORTGP. Use Value: Built-in DSACK0/DSACK1 signals enable direct connection to slow-response isolation ICs without glue logic - cuts BOM cost by $1.20/unit. |
Use Scenario: High-accuracy polyphase energy meter with metrology ASIC interface and tamper detection. IC Role / Device Role / Timing Role: MC68331MEH16 serves as the secure host controller, reading metrology registers via QSPI, validating checksums, logging events to EEPROM via SCI, and triggering tamper interrupts on PAI pin. Use Value: Hardware CRC quotient generator (QUOT pin) accelerates firmware integrity checks - reduces boot validation time from 120 ms to 8 ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 32-bit industrial microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68332CAG16 | Same CPU32 core and SIM/GPT/QSM peripherals but adds 2 KB on-chip RAM and enhanced interrupt controller; 144-pin QFP package | Supports larger real-time task sets and faster context switching; requires PCB redesign due to different pinout and larger footprint | Select when additional on-chip RAM and higher interrupt throughput are required; not drop-in compatible with MC68331MEH16 |
| MPC5604B | Power Architecture e200z0 core, 64 MHz max, CAN FD, JTAG debug; no QSPI or built-in bus monitor | Targets modern automotive ECUs with CAN networking; lacks MC68331MEH16's deterministic QSPI queue and hardware bus fault detection | Choose for CAN-based distributed systems; requires significant firmware rewrite and external watchdog implementation |
Compared with MC68331MEH16, MC68332CAG16 offers more on-chip resources but demands layout changes, while MPC5604B delivers higher performance and CAN connectivity at the cost of losing integrated bus monitoring and QSPI efficiency - making MC68331MEH16 optimal for cost-sensitive, self-contained industrial controllers.
Availability
MC68331MEH16 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, PLC I/O modules, and energy metering front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MC68331MEH16 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) specialized in high-reliability microcontrollers for automotive, industrial, and aerospace applications before its 2015 acquisition.
The MC68331 product line was engineered for deterministic real-time control in harsh environments, emphasizing modularity, integrated system protection, and debuggability - directly addressing needs in factory automation and vehicle subsystems.
FAQ
What is the operating temperature range of the MC68331MEH16?
The MC68331MEH16 is rated for −40°C to +125°C operation, validated per Freescale's industrial qualification standards. This extended range ensures reliable function in under-hood automotive locations, industrial enclosures without forced cooling, and outdoor metering equipment. The device maintains full specification compliance-including timing, voltage thresholds, and peripheral functionality-across this entire span, with no derating required.
Does the MC68331MEH16 support external memory expansion?
Yes, the MC68331MEH16 supports external memory expansion via its 24-bit address bus and 16-bit data bus, with eleven programmable chip-select outputs (CS0–CS10) and dedicated boot ROM select (CSBOOT). Each chip select has independently configurable base address and option registers in the SIM, enabling flexible memory mapping for SRAM, Flash, and peripheral devices up to 16 MB total address space.
How does the MC68331MEH16 implement low-power operation?
The MC68331MEH16 implements low-power operation through its fully static CPU32 core and LPSTOP instruction, which halts the system clock while preserving all register and RAM contents. Power consumption drops to microampere levels in STOP mode. Additionally, the SIM's clock synthesizer can operate from a low-frequency 32.768 kHz crystal, enabling ultra-low-power real-time clock functions without external components.
What debug interfaces are available on the MC68331MEH16?
The MC68331MEH16 provides Background Debug Mode (BDM) via three dedicated pins: DSI (Debug Serial In), DSO (Debug Serial Out), and DSCLK (Debug Serial Clock). This two-wire serial interface enables non-intrusive real-time debugging, including hardware breakpoints, register inspection, and flash programming - all without requiring JTAG hardware or consuming CPU resources during normal operation.
Is the MC68331MEH16 pin-compatible with other members of the MC6833x family?
No, the MC68331MEH16 is not pin-compatible with other MC6833x variants. While it shares the same 132-pin PQFP footprint as MC68331CFC16 and MC68331VFC16, pin functions differ across temperature grades due to internal routing and test structure variations. Specifically, the MEH16 variant assigns PQS7/TXD and RXD to dedicated SCI pins, whereas some CFC variants repurpose those pins for alternate functions - requiring schematic and layout verification before substitution.
MC68331MEH16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 132-BQFP Bumpered
- Series:
- M683xx
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- CPU32
- Core Size:
- 32-Bit Single-Core
- Speed:
- 16MHz
- Connectivity:
- EBI/EMI, SCI, SPI, UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 18
- Program Memory Size:
- -
- Program Memory Type:
- ROMless
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68331MEH16 FAQ
1.How can I place an order for MC68331MEH16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68331MEH16 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 MC68331MEH16 reliable?
The price and inventory of MC68331MEH16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68331MEH16 is usually 5 days.
3.What payment methods are accepted for MC68331MEH16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68331MEH16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68331MEH16?
MC68331MEH16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68331MEH16 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 MC68331MEH16?
For technical support, including MC68331MEH16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68331MEH16 requirements.
6.How does Aetrix verify that MC68331MEH16 is sourced from the original manufacturer or authorized distributors?
All MC68331MEH16 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 MC68331MEH16 meets industry standards.
7.What is the process for return or replacement of MC68331MEH16?
All MC68331MEH16 units undergo pre-shipment inspection (PSI). If there is an issue with MC68331MEH16, 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 MC68331MEH16 part is unused and in its original packaging.
Return procedure for MC68331MEH16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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