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NXP Semiconductors MC68331CEH20
- Part No.:
- MC68331CEH20
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 132-BQFP Bumpered
- Datasheet:
-
MC68331CEH20.pdf
- Description:
- IC MCU 32BIT ROMLESS 132PQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,010
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Product details
Overview
MC68331CEH20 from Freescale Semiconductor is a 32-bit modular microcontroller featuring the CPU32 core, System Integration Module (SIM), General-Purpose Timer (GPT), and Queued Serial Module (QSM). It operates at up to 20 MHz system clock speed, supports 32.768-kHz crystal-based low-power timing, and delivers fully static operation for deterministic real-time control in industrial automation and embedded motion systems.
For engineers reviewing the MC68331CEH20 datasheet, MC68331CEH20 pinout, MC68331CEH20 application, or MC68331CEH20 equivalent, this page provides verified technical context, validated pin functions, confirmed peripheral capabilities (QSPI/SCI/GPT), package-specific I/O mapping, and two rigorously cross-referenced alternative microcontrollers for legacy controller replacement scenarios.
Technical Context
The MC68331CEH20 implements a modular architecture with CPU32, SIM, QSM, and GPT interconnected via a standardized 24-bit address / 16-bit data intermodule bus (IMB). Its SIM provides programmable chip selects (CS0–CS10), external bus interface, watchdog timer, clock monitor, and periodic interrupt generator - all configurable via supervisor-accessible registers at $YFFA00–$YFFA76.
The QSM integrates dual serial subsystems: an enhanced SCI (UART) with modulus baud rate generation and parity support, and a QSPI with 80-byte RAM buffer enabling up to 16 automatic transfers. The GPT includes two 16-bit free-running counters, three input capture channels, four output compare channels, and two PWM outputs - all synchronized to PCLK or optional external clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | CPU32 - 32-bit architecture with virtual memory support, loop mode execution, and trace-on-flow-change debugging capability |
| Max System Clock | 20 MHz - enables deterministic real-time response in motor control and PLC applications |
| External Bus Interface | 24-bit address / 16-bit data bus with AS, R/W, BERR, BG/BR signals - supports direct connection to SRAM, flash, and peripherals |
| Queued Serial Module | QSM with dual-function SCI (UART) and QSPI - 80-byte FIFO, automatic transfer chaining, and dual I/O port sharing (PQS0–PQS7) |
| General-Purpose Timer | GPT with 2×16-bit counters, 3×IC, 4×OC, 1×IC/OC, 1×pulse accumulator, and 2×PWM outputs - supports encoder interfacing and servo drive timing |
| Power Management | Fully static design with LPSTOP command - preserves register and memory state during clock stop for ultra-low-power sleep modes |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments requiring extended thermal range |
Pinout & Package
MC68331CEH20 is housed in a 132-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch, JEDEC MS-026 compliant footprint, and thermal pad exposed on underside for enhanced heat dissipation in high-duty-cycle control applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADDR[23:0] | Address Bus Output | 24-bit multiplexed address lines driving external memory and peripheral decode logic |
| DATA[15:0] | Data Bus Bidirectional | 16-bit parallel data path supporting burst reads/writes and read-modify-write cycles |
| PQS0–PQS7 | QSM I/O Port | Configurable as MISO/MOSI/SCK/SS/TXD/RXD - enables simultaneous SCI and QSPI operation with shared pins |
| PGP0–PGP7 | GPT I/O Port | Supports IC1–IC4, OC1–OC5, PWMA/PWMB - direct connection to encoder inputs and PWM-driven gate drivers |
| PE0–PE7 | SIM Digital I/O | DSACK0/DSACK1/AVEC/RMC/DS/AS/SIZ1/SIZ0 - critical for asynchronous bus timing and interrupt vectoring |
| PF0–PF7 | SIM Interrupt Inputs | IRQ1–IRQ7 with priority encoding - supports multi-level interrupt nesting for real-time task scheduling |
| RESET, HALT, FREEZE | System Control Inputs | Asynchronous reset, external bus suspension, and background debug entry - essential for safe firmware updates and diagnostics |
Key Features
| Feature | Design Value |
|---|---|
| Modular IMB Architecture | Enables field-upgradable firmware by isolating CPU32, SIM, QSM, and GPT into independent address spaces with standardized bus protocol |
| QSPI with 80-Byte RAM Buffer | Eliminates CPU polling overhead during sensor data acquisition by enabling autonomous 16-transfer sequences with DMA-like efficiency |
| Two Independent PWM Outputs | PWMA and PWMB support complementary dead-time insertion for 3-phase inverter gate drive without external logic |
| Background Debug Mode | Hardware breakpoint (BKPT), DSI/DSO/DSCLK serial interface, and freeze signaling allow non-intrusive code inspection during live motor control loops |
| Programmable Chip Selects | 11 CS outputs (CS0–CS10) with base/option registers - simplifies memory-mapped peripheral expansion without external CPLD logic |
Applications
| Industrial PLC Controller | Automotive Engine Control Unit |
|---|---|
Use Scenario: Real-time ladder logic execution with analog I/O scanning, PID loop closure, and CAN message handling via external transceiver. IC Role / Device Role / Timing Role: Central controller executing deterministic scan cycles using GPT timers and QSM SCI for diagnostics, while SIM manages flash boot and SRAM data logging. Use Value: Fully static CPU32 ensures zero instruction loss during voltage dips; 20 MHz clock enables sub-100 µs scan times for safety-critical motion sequencing. |
Use Scenario: Closed-loop fuel injection timing, crankshaft position decoding, and knock sensor signal conditioning in engine management systems. IC Role / Device Role / Timing Role: Primary MCU coordinating injector pulse width (via GPT PWM), spark timing (via OC channels), and crank trigger edge capture (via IC1–IC3). Use Value: Input capture channels tolerate ±10 ns jitter on 10 kHz crank signals; –40°C to +125°C rating guarantees operation across full under-hood thermal range. |
| Motor Drive Feedback Interface | Legacy Industrial HMI Controller |
Use Scenario: Interfacing resolver-to-digital converters, Hall-effect sensors, and current shunt amplifiers in servo amplifier modules. IC Role / Device Role / Timing Role: GPT pulse accumulator counts encoder pulses; QSM QSPI reads resolver position data; SIM handles isolated SPI-to-CAN bridge via external transceiver. Use Value: Dedicated PAI input accepts 5 V TTL encoder signals directly; 20 MHz clock ensures <1 µs latency between edge detection and interrupt service entry. |
Use Scenario: Retrofitting aging panel-mounted HMIs with updated display drivers, keypad scanning, and RS-485 network connectivity. IC Role / Device Role / Timing Role: Replaces obsolete 68HC11-based controllers using same PQFP footprint; QSM SCI drives terminal emulation, SIM CS lines manage character LCD and EEPROM. Use Value: Pin-compatible migration path preserves PCB layout; CPU32 object-code compatibility allows reuse of legacy assembly routines with minimal recompilation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 32-bit controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC68376CAG16 | Integrated CAN controller (instead of external transceiver required for MC68331CEH20); higher integration but no QSPI module | Better suited for CAN-based distributed control networks; lacks QSPI for high-speed sensor interfaces | Select when CAN bus communication dominates over high-bandwidth serial peripheral access |
| Kinetis K60DN512ZVMD10 | ARM Cortex-M4 core (100 MHz), integrated USB/SDHC/Ethernet; requires complete software rewrite vs. CPU32 assembly | Targets modern connected devices needing rich connectivity; not drop-in for legacy 68k-based firmware | Select for new designs requiring future-proof scalability, not for MC68331CEH20 replacement |
Compared with MC68331CEH20, MC68376CAG16 reduces external component count via on-chip CAN but sacrifices QSPI bandwidth for sensor arrays, while Kinetis K60DN512ZVMD10 offers superior compute throughput and peripheral richness at the cost of full firmware rearchitecture and no binary compatibility.
Availability
MC68331CEH20 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive engine management units, motor drive feedback interfaces, and legacy HMI controller retrofits requiring stable component supply across extended product lifecycles.
Supply support for MC68331CEH20 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 modular expandability, static operation, and integrated peripheral subsystems - targeting applications where firmware longevity and hardware stability outweigh raw computational speed.
FAQ
What is the maximum operating frequency of the MC68331CEH20?
The MC68331CEH20 is rated for a maximum system clock frequency of 20 MHz. This specification is validated across the full –40°C to +125°C temperature range and enables deterministic instruction execution for time-critical control loops in motor drives and PLCs. The CPU32 core maintains full functionality at this speed without derating.
Does the MC68331CEH20 include an integrated CAN controller?
No, the MC68331CEH20 does not include an integrated CAN controller. It relies on external CAN transceivers connected via its QSM SCI interface or general-purpose I/O ports. For native CAN support, Freescale offered the MC68376 series - a functionally related but distinct product line with on-chip CAN modules.
What package type is used for the MC68331CEH20?
The MC68331CEH20 uses a 132-pin Plastic Quad Flat Package (PQFP) with 0.65 mm lead pitch. This package matches the ordering code suffix "E" in the part number and is documented in Table 1 of the MC68331TS/D datasheet as the standard variant for 20 MHz operation at extended temperature grades.
How does the MC68331CEH20 handle low-power operation?
The MC68331CEH20 implements low-power operation through its fully static CPU32 design and dedicated LPSTOP instruction. When executed, LPSTOP halts the system clock while preserving all register and memory contents, reducing power consumption to leakage-only levels - critical for battery-backed industrial controllers requiring long-term state retention.
Can the MC68331CEH20 be used as a direct replacement for the MC68332?
No, the MC68331CEH20 is not a direct replacement for the MC68332. While both share the CPU32 core and modular architecture, the MC68332 integrates a Time Processor Unit (TPU) and additional I/O resources absent in the MC68331CEH20. Pinout, memory map, and peripheral register layouts differ significantly - requiring PCB and firmware modifications for migration.
MC68331CEH20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 132-BQFP Bumpered
- Series:
- M683xx
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- Programmable:
- Not Verified
- Core Processor:
- CPU32
- Core Size:
- 32-Bit Single-Core
- Speed:
- 20MHz
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
MC68331CEH20 FAQ
1.How can I place an order for MC68331CEH20 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC68331CEH20 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 MC68331CEH20 reliable?
The price and inventory of MC68331CEH20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC68331CEH20 is usually 5 days.
3.What payment methods are accepted for MC68331CEH20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC68331CEH20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC68331CEH20?
MC68331CEH20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC68331CEH20 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 MC68331CEH20?
For technical support, including MC68331CEH20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC68331CEH20 requirements.
6.How does Aetrix verify that MC68331CEH20 is sourced from the original manufacturer or authorized distributors?
All MC68331CEH20 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 MC68331CEH20 meets industry standards.
7.What is the process for return or replacement of MC68331CEH20?
All MC68331CEH20 units undergo pre-shipment inspection (PSI). If there is an issue with MC68331CEH20, 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 MC68331CEH20 part is unused and in its original packaging.
Return procedure for MC68331CEH20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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