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Renesas M38227ECHP#U0
- Part No.:
- M38227ECHP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
M38227ECHP#U0.pdf
- Description:
- 8-BIT, 740/3822 CPU
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Product details
Overview
M38227ECHP#U0 from Renesas Electronics is an 8-bit CMOS microcontroller based on the 740 family core, featuring integrated LCD drive control (1/2–1/4 duty, 4 commons, 32 segments), 8-channel 8-bit A-D converter, UART/clock-synchronized serial I/O, three 8-bit timers and two 16-bit timers, and 49 programmable I/O ports. It operates from 2.5–5.5 V in middle/low-speed modes and supports –20 to +85°C ambient temperature - deployed in consumer-grade LCD-based appliances such as digital cameras and home electronics.
For engineers reviewing the M38227ECHP#U0 datasheet, M38227ECHP#U0 pinout, M38227ECHP#U0 application, or M38227ECHP#U0 equivalent, key selection criteria include its 48 KB Mask ROM + 1024-byte RAM configuration, 80-pin QFP package with dedicated LCD segment/common drivers, low-power operation down to 45 µW at 32 kHz, and compatibility with ceramic resonator or quartz crystal clock sources.
Technical Context
The M38227ECHP#U0 implements a 740-family instruction set with 71 base instructions and minimum 0.5 µs instruction cycle at 8 MHz. Its dual clock system includes main oscillator (XIN/XOUT) for system timing and sub-oscillator (XCIN/XCOUT) for real-time port and low-power wake-up functions.
On-chip peripherals include an 8-bit A-D converter with 8 analog input channels (AN0–AN7), software-controllable pull-up/pull-down resistors on ports P0–P7 (excluding P40), and interrupt support across 17 sources with 16 vectors - including key-on-wake-up via port P3 inputs and real-time port interrupts (RTP0/RTP1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | 740 family 8-bit architecture with 71 instructions; supports STP, WIT, MUL, DIV but not FST/SLW. |
| ROM / RAM | 48 KB Mask ROM (49152 bytes, user space 49022 bytes) and 1024-byte RAM - sufficient for mid-complexity embedded control with LCD UI. |
| Operating Voltage | 2.5–5.5 V (middle/low-speed mode); enables direct interface with standard 3.3 V or 5 V logic and power rails. |
| Power Dissipation | 32 mW at 8 MHz/5 V (high-speed); 45 µW at 32 kHz/3 V (low-speed) - suitable for battery-backed or energy-conscious designs. |
| LCD Driver | Supports 1/2, 1/3, or 1/4 bias; 4 common outputs (COM0–COM3) and up to 32 segment outputs (SEG0–SEG31) - drives multiplexed character or segment displays without external drivers. |
| A-D Converter | 8-bit resolution, 8-channel single-ended input (AN0–AN7); reference voltage selectable via VREF pin - enables sensor monitoring (e.g., temperature, light, battery level). |
| Timers | Three 8-bit timers (T1–T3) and two 16-bit timers (TX, TY); support capture/compare, PWM, and interval counting - usable for motor control, signal generation, or time-stamped event handling. |
Pinout & Package
Package: 80-pin plastic-molded QFP (80P6Q-A), 0.5 mm pitch, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC / VSS | Power supply / Ground | Primary digital power domain; VCC must be 2.5–5.5 V; VSS tied to 0 V reference for all digital and analog sections. |
| XIN / XOUT | Main clock oscillator interface | Connect external ceramic resonator or quartz crystal; internal feedback resistor eliminates need for external components. |
| XCIN / XCOUT | Sub-clock oscillator interface | Dedicated pins for low-frequency (e.g., 32.768 kHz) crystal; enables RTC functionality and ultra-low-power wake-up. |
| COM0–COM3 | LCD common outputs | Drive LCD backplane electrodes; COM2/COM3 unused at 1/2 duty; COM3 unused at 1/3 duty - configures display multiplex ratio in firmware. |
| SEG0–SEG31 | LCD segment outputs | Direct-drive capability for up to 128 segments (4 × 32); mapped across ports P0–P1 and P3–P4 - reduces BOM count in display-centric systems. |
| AN0–AN7 | Analog inputs | 8 single-ended ADC channels routed to port P6; share pins with digital I/O - requires careful pinmux planning during PCB layout. |
| P52/RTP0, P53/RTP1 | Real-time port I/O | Supports periodic wake-up from STOP mode using sub-clock; used for calendar/timekeeping without CPU intervention. |
| P44/RXD, P45/TXD | UART serial interface | Full-duplex asynchronous communication; compatible with standard TTL-level RS-232 transceivers or direct MCU-to-MCU links. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LCD controller | Eliminates external segment drivers; supports 1/2–1/4 duty and 1/2–1/3 bias - reduces component count and board area in display applications. |
| Software-configurable I/O | All I/O ports (except P40) support programmable pull-up/pull-down; enables robust key scanning and noise-immune digital interfacing without external resistors. |
| Low-power STOP mode | 45 µW consumption at 32 kHz sub-clock; wake-up via key-on interrupt (P34–P37), real-time port, or external INTx - extends battery life in portable devices. |
| Dual clock domains | Main clock (XIN/XOUT) for performance; sub-clock (XCIN/XCOUT) for timekeeping and wake-up - decouples system timing from real-time functions. |
| 17-source interrupt system | Includes dedicated key-input interrupt with debouncing support; allows responsive UI handling while CPU remains in low-power state between events. |
Applications
| Digital Camera Control | Smart Appliance UI |
|---|---|
Use Scenario: Managing lens focus, exposure timing, and image preview on small monochrome LCD panels. IC Role / Device Role / Timing Role: Primary system controller executing firmware, driving LCD segments/commmons, sampling sensor data (e.g., light meter), and coordinating flash timing via timer outputs. Use Value: Integrated LCD driver and 8-bit A-D converter eliminate discrete support ICs; 48 KB ROM accommodates feature-rich camera firmware with menu navigation and image processing routines. | Use Scenario: Controlling cooking cycles, temperature sensing, and displaying status on segmented LCDs in microwave ovens or rice cookers. IC Role / Device Role / Timing Role: Real-time coordinator of heating elements, relay drivers, and user input; uses RTC-capable sub-clock for precise cooking duration tracking. Use Value: Sub-clock wake-up (RTP0/RTP1) enables accurate timekeeping during standby; 1024-byte RAM retains operational state across power cycles without external backup. |
| Portable Medical Monitor | Industrial Panel Meter |
Use Scenario: Displaying pulse rate, oxygen saturation, and battery status on compact LCDs in handheld pulse oximeters. IC Role / Device Role / Timing Role: Sensor interface hub collecting analog signals (photodiode outputs), performing basic signal conditioning, and updating segmented display at 2 Hz refresh rate. Use Value: 8-channel A-D converter directly digitizes multiple sensor inputs; low-power STOP mode extends single-battery operation beyond 100 hours. | Use Scenario: Reading analog process variables (e.g., pressure, flow) and presenting values on 4-digit LCDs in factory HMIs. IC Role / Device Role / Timing Role: Standalone measurement engine with calibration storage in ROM, auto-ranging via software-controlled gain, and serial output for upstream PLC integration. Use Value: UART interface (RXD/TXD) enables Modbus RTU communication; 49 I/O ports allow flexible expansion for pushbuttons, LEDs, and relay control without glue logic. |
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#U0 | H-version variant with same 48 KB ROM/1024-byte RAM but rated for extended temperature (–40 to +85°C); identical pinout and peripheral set. | Suitable for industrial environments requiring wider thermal stability; not qualified for automotive or safety-critical use per Renesas quality grading. | Select M38227MCHP#U0 when operating ambient exceeds +85°C or drops below –20°C; otherwise M38227ECHP#U0 suffices for consumer-grade applications. |
| M38224M6HXXXHP | 24 KB ROM / 640-byte RAM; same 80P6Q-A package, identical peripherals and clock architecture - smaller memory footprint. | Better suited for cost-sensitive designs where firmware size < 24 KB; retains full LCD/A-D/timer functionality with reduced code capacity. | Choose M38224M6HXXXHP if application firmware fits within 24 KB and lower BOM cost is prioritized over future feature expansion headroom. |
Compared with M38227ECHP#U0, M38227MCHP#U0 offers guaranteed operation at –40°C but no functional upgrade, while M38224M6HXXXHP trades 24 KB ROM and 384-byte RAM for lower unit cost - both retain identical LCD, A-D, and timer capabilities and require no PCB changes.
Availability
M38227ECHP#U0 is available at Aetrix Electronics and suitable for digital camera control, smart appliance UI, portable medical monitor, and industrial panel meter applications requiring stable component supply and long-term production continuity.
Supply support for M38227ECHP#U0 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 in 2010 through the merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power solutions.
The 3822 Group - including M38227ECHP#U0 - was designed for cost-effective, display-integrated embedded control in consumer electronics, emphasizing LCD drive capability, low-power operation, and sensor interfacing without external support ICs.
FAQ
What is the maximum operating frequency supported by M38227ECHP#U0?
M38227ECHP#U0 supports a maximum oscillation frequency of 8 MHz using an external ceramic resonator or quartz crystal connected to XIN/XOUT. At this frequency, the minimum instruction execution time is 0.5 µs. The device also supports sub-clock operation at 32.768 kHz via XCIN/XCOUT for real-time functions and low-power wake-up - critical for battery-powered M38227ECHP#U0 deployments.
Does M38227ECHP#U0 include built-in debug or programming interfaces?
M38227ECHP#U0 does not integrate on-chip debug circuitry or JTAG/SWD interfaces. Programming is performed via parallel programming through the 80-pin package using a dedicated EPROM programmer compatible with Mitsubishi/Renesas 3822-series OTP devices. The M38227ECHP#U0 One Time PROM version ships blank and requires mask-ROM-equivalent firmware loading prior to final test - no in-system reprogramming capability.
Can M38227ECHP#U0 drive a 4×32-segment LCD without external components?
Yes - M38227ECHP#U0 integrates a full LCD driver supporting up to 4 commons (COM0–COM3) and 32 segments (SEG0–SEG31), configurable for 1/2, 1/3, or 1/4 duty and 1/2 or 1/3 bias. All required voltage levels (VL1–VL3) are generated internally from VCC; no external charge pumps, resistors, or capacitors are needed for basic static or multiplexed segment driving - a key design advantage of the M38227ECHP#U0.
What are the power supply requirements for M38227ECHP#U0's analog section?
M38227ECHP#U0 requires separate analog ground (AVSS) tied to VSS and an analog reference voltage (VREF) pin for the 8-bit A-D converter. AVSS must be connected to the same 0 V plane as digital VSS; VREF can be externally supplied (0–VCC) or internally derived. The A-D converter operates correctly only when VCC is within 2.5–5.5 V and VREF is stable - deviations affect conversion linearity and accuracy in M38227ECHP#U0 sensor applications.
Is M38227ECHP#U0 pin-compatible with other members of the 3822 Group?
M38227ECHP#U0 uses the 80P6Q-A package and shares identical pinout with all 80-pin H-version variants (e.g., M38224M6HXXXHP, M38227M8HXXXHP) and GP/FP-package equivalents in functionally aligned positions. However, memory size, temperature grade, and ROM type differ - firmware and power delivery must be validated per variant. Pin compatibility holds strictly within the 80-pin QFP family; 80D0 ceramic LCC variants are not pin-compatible with M38227ECHP#U0.
M38227ECHP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
M38227ECHP#U0 FAQ
1.How can I place an order for M38227ECHP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for M38227ECHP#U0 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 M38227ECHP#U0 reliable?
The price and inventory of M38227ECHP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M38227ECHP#U0 is usually 5 days.
3.What payment methods are accepted for M38227ECHP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M38227ECHP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M38227ECHP#U0?
M38227ECHP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M38227ECHP#U0 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 M38227ECHP#U0?
For technical support, including M38227ECHP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M38227ECHP#U0 requirements.
6.How does Aetrix verify that M38227ECHP#U0 is sourced from the original manufacturer or authorized distributors?
All M38227ECHP#U0 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 M38227ECHP#U0 meets industry standards.
7.What is the process for return or replacement of M38227ECHP#U0?
All M38227ECHP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with M38227ECHP#U0, 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 M38227ECHP#U0 part is unused and in its original packaging.
Return procedure for M38227ECHP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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