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Renesas M38227ECFP
- Part No.:
- M38227ECFP
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 80-BQFP
- Datasheet:
-
M38227ECFP.pdf
- Description:
- IC MCU 8BIT 48KB OTP 80QFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,836
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Product details
Overview
M38227ECFP from Renesas Electronics is an 8-bit CMOS microcontroller based on the 740 family core, featuring 48 KB mask ROM, 1024 bytes RAM, integrated LCD drive control (1/2–1/4 duty, 4 commons, 32 segments), 8-channel 8-bit A/D converter, and dual clock circuits for system/sub-clock operation. It operates from 2.5–5.5 V and targets embedded consumer applications with display and analog sensing.
For engineers reviewing the M38227ECFP datasheet, M38227ECFP pinout, M38227ECFP application, or M38227ECFP equivalent, this device serves as a cost-optimized, single-chip solution for battery-powered or AC-powered appliances requiring LCD interface, analog input monitoring, and real-time timer functions - especially where extended temperature range is not required.
Technical Context
The M38227ECFP implements the 740-family instruction set with 71 basic machine-language instructions and a minimum instruction execution time of 0.5 µs at 8 MHz. Its CPU includes accumulator (A), index registers (X/Y), and stack pointer (S), supporting index addressing and interrupt-driven operation with 17 interrupt sources and 16 vectors.
It integrates two independent clock generating circuits: one for main system clock (via XIN/XOUT with ceramic resonator or quartz crystal), and another for sub-clock (via XCIN/XCOUT with resonator only). The LCD controller supports programmable bias (1/2, 1/3) and duty (1/2, 1/3, 1/4), driving up to 4 common and 32 segment outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 740-family 8-bit CPU with 71 instructions; supports index addressing and subroutine calls via 8-bit stack pointer. |
| ROM / RAM | 48 KB mask ROM (49152 bytes, user space 49022 bytes); 1024 bytes RAM - sufficient for medium-complexity firmware with LCD buffer and sensor data handling. |
| Operating Voltage | 2.5–5.5 V in high/middle/low-speed modes - compatible with standard 3.3 V and 5 V systems without level-shifting. |
| A/D Converter | 8-channel, 8-bit successive-approximation ADC with external trigger (ADT pin) - enables precise analog signal sampling for sensors or controls. |
| LCD Drive | Supports 1/2, 1/3, or 1/4 duty and 1/2 or 1/3 bias; drives up to 4 COM × 32 SEG - suitable for alphanumeric or segmented displays in home appliances. |
| Timers | Three 8-bit timers (T1–T3) and two 16-bit timers (TX, TY) - provides flexible timing, PWM generation, and real-time port (RTP) functions. |
| Power Dissipation | 32 mW at 8 MHz/5 V (high-speed mode); 45 µW at 32 kHz/3 V (low-speed mode) - enables low-power standby and wake-on-key functionality. |
Pinout & Package
Package: 80-pin plastic-molded QFP (80P6N-A, 0.8 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC / VSS | Power supply / Ground | Main digital power rails; VCC must be 2.5–5.5 V; VSS is analog/digital common ground reference. |
| XIN / XOUT | Main clock oscillator interface | Connects external ceramic resonator or quartz crystal; internal feedback resistor enables self-oscillation. |
| XCIN / XCOUT | Sub-clock oscillator interface | Accepts external resonator only (no external clock input); used for RTC or low-power timing. |
| COM0–COM3 | LCD common outputs | Drive LCD backplane lines; COM2/COM3 unused at 1/2 duty; COM3 unused at 1/3 duty. |
| SEG0–SEG31 | LCD segment outputs | Direct-drive segment lines; mapped across P0–P1, P3–P4 pins with shared I/O functionality. |
| P60–P67 / AN0–AN7 | Analog input channels | 8 dedicated A/D input pins; share physical terminals with Port 6; require AVSS and VREF for accurate conversion. |
| RESET | Active-low reset input | Asynchronous reset asserted by logic low; internal pull-up ensures reliable startup without external components. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LCD controller | Eliminates external driver IC; supports 4×32 segment configuration with software-selectable bias/duty for display optimization. |
| 8-channel 8-bit A/D converter | Enables direct connection of potentiometers, thermistors, or voltage-sensed signals without external ADC or signal conditioning. |
| Real-time port (RTP) | Provides calendar/timekeeping with dedicated RTPO/RTPI pins and internal counter - usable for clock, timer, or alarm functions. |
| Key-on wake-up interrupt | Allows ultra-low-power sleep mode (45 µW) with hardware-triggered wake-up from P34–P37, reducing system-level power management complexity. |
| Dual clock domains | Enables concurrent high-speed processing (main clock) and low-power timing (sub-clock), critical for responsive UI + background RTC operation. |
Applications
| Refrigerator Control Panel | Electronic Oven Interface |
|---|---|
Use Scenario: Managing temperature setpoints, defrost cycles, and door-open alerts via membrane keypad and segmented LCD. IC Role / Device Role / Timing Role: Primary system controller executing UI logic, reading thermistor inputs, driving 4×20-segment display, and managing real-time defrost scheduling. Use Value: Single-chip integration reduces BOM count and PCB area; built-in A/D and LCD drive eliminate discrete support components. |
Use Scenario: Monitoring cooking time, oven temperature, and user inputs while displaying countdown and status on multi-digit LCD. IC Role / Device Role / Timing Role: Central MCU handling key scan, 8-channel analog sensing (temperature, current), and synchronized LCD refresh using internal timers. Use Value: 0.5 µs instruction cycle enables responsive button debouncing and fast display updates; low-power sleep extends standby battery life. |
| Portable Blood Pressure Monitor | Smart Thermostat Display Unit |
Use Scenario: Capturing cuff pressure transducer output, calculating systolic/diastolic values, and rendering results on monochrome LCD. IC Role / Device Role / Timing Role: Signal acquisition MCU with 8-bit A/D resolution sufficient for medical-grade pressure digitization and LCD segment control. Use Value: Integrated VREF and AVSS pins ensure stable analog reference; LCD bias/duty flexibility supports varied display contrast requirements. |
Use Scenario: Reading ambient temperature/humidity sensors, interpreting HVAC commands, and updating 4-line segmented display with icons and values. IC Role / Device Role / Timing Role: Embedded controller interfacing I²C or analog sensors, managing real-time clock, and driving multiplexed LCD with software-controlled COM/SEG timing. Use Value: Dual clock system allows continuous RTC operation during deep sleep; 1024-byte RAM accommodates sensor history buffers and UI state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M38227MCHP | Mask ROM version with H-grade extended temperature range (–40 to +85°C); same 48 KB ROM/1024 B RAM but higher industrial qualification. | Suitable for HVAC or outdoor appliance control where ambient temperature exceeds standard –20 to +85°C rating. | Select M38227MCHP when operating environment requires guaranteed performance beyond standard commercial temperature limits. |
| M38227ECHP | Same One Time PROM configuration as M38227ECFP but in 0.5 mm-pitch 80P6Q-A package - smaller footprint, finer pitch. | Preferred for space-constrained designs where PCB real estate is limited and reflow capability supports fine-pitch QFP. | Choose M38227ECHP when board layout demands higher component density and assembly process supports 0.5 mm pitch. |
Compared with M38227ECFP, M38227MCHP adds extended temperature support at the cost of OTP flexibility, while M38227ECHP retains identical functionality in a smaller package - enabling trade-offs between thermal robustness, programming flexibility, and board space.
Availability
M38227ECFP is available at Aetrix Electronics and suitable for refrigerator control panels, electronic ovens, portable medical monitors, smart thermostats, and consumer appliance interfaces requiring stable component supply and long-term production continuity.
Supply support for M38227ECFP 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
Renesas Electronics Corporation is a global semiconductor leader formed from the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions for industrial and consumer markets.
The 3822 Group was designed specifically for cost-sensitive, display-intensive embedded applications in home appliances and portable electronics - emphasizing integrated LCD drive, analog sensing, and low-power operation without external support ICs.
FAQ
What is the maximum operating frequency supported by the M38227ECFP?
The M38227ECFP supports a maximum oscillation frequency of 8 MHz via its main clock circuit (XIN/XOUT), delivering a minimum instruction execution time of 0.5 µs. This frequency is validated under recommended operating conditions of 2.5–5.5 V supply and ambient temperature of –20 to +85°C. Higher frequencies are not specified or guaranteed for M38227ECFP.
Does the M38227ECFP include a hardware real-time clock (RTC)?
The M38227ECFP does not contain a dedicated hardware RTC module, but it provides Real-Time Port (RTP) functionality through pins P52/RTP0 and P53/RTP1, enabling calendar/timekeeping via software-driven counters synchronized to the sub-clock oscillator (XCIN/XCOUT). This implementation requires firmware management but avoids external RTC ICs.
Can the M38227ECFP drive a 1/4-duty LCD display?
Yes, the M38227ECFP's LCD drive control circuit explicitly supports 1/4-duty operation, along with 1/2 and 1/3 duty ratios, and 1/2 or 1/3 bias configurations. It provides four common outputs (COM0–COM3) and up to 32 segment outputs, making it compatible with standard 4×32 segment LCD modules used in consumer appliances.
What type of memory technology is used in the M38227ECFP?
The M38227ECFP uses One Time Programmable (OTP) EPROM memory for its 48 KB program storage, indicated by the "E" in the part number prefix. This allows factory programming with final firmware and prevents field reprogramming, ensuring code integrity in mass-produced consumer devices.
Is the M38227ECFP RoHS compliant?
Yes, the M38227ECFP complies with the EU RoHS Directive, as confirmed by Renesas Electronics' environmental compliance documentation. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE) above threshold limits, and is suitable for environmentally regulated markets.
M38227ECFP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 80-BQFP
- Series:
- 740/38000
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 740
- Core Size:
- 8-Bit
- Speed:
- 8MHz
- Connectivity:
- SIO, UART/USART
- Peripherals:
- LCD
- Number of I/O:
- 49
- Program Memory Size:
- 48KB (48K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.5V ~ 5.5V
- Data Converters:
- A/D 8x8b
- Oscillator Type:
- External
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
M38227ECFP FAQ
1.How can I place an order for M38227ECFP through Aetrix?
Please submit a Request for Quotation (RFQ) for M38227ECFP 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 M38227ECFP reliable?
The price and inventory of M38227ECFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M38227ECFP is usually 5 days.
3.What payment methods are accepted for M38227ECFP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M38227ECFP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M38227ECFP?
M38227ECFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M38227ECFP 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 M38227ECFP?
For technical support, including M38227ECFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M38227ECFP requirements.
6.How does Aetrix verify that M38227ECFP is sourced from the original manufacturer or authorized distributors?
All M38227ECFP 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 M38227ECFP meets industry standards.
7.What is the process for return or replacement of M38227ECFP?
All M38227ECFP units undergo pre-shipment inspection (PSI). If there is an issue with M38227ECFP, 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 M38227ECFP part is unused and in its original packaging.
Return procedure for M38227ECFP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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