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Renesas M37545G4GP#U0
- Part No.:
- M37545G4GP#U0
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
M37545G4GP#U0.pdf
- Description:
- IC MCU 8BIT 16KB QZROM 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,057
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Product details
Overview
M37545G4GP#U0 from Renesas Electronics is an 8-bit CMOS microcontroller based on the 740 family core, featuring 16 KB QzROM, 512 bytes RAM (384 + 128), built-in 455 kHz carrier wave generator for IR transmission, and integrated voltage drop detection at 1.75 V. It operates from 1.8–3.6 V at 4 MHz and targets infrared remote control transmitters requiring low-power, LED-driving I/O, and key-on-wakeup functionality.
For engineers reviewing the M37545G4GP#U0 datasheet, M37545G4GP#U0 pinout, M37545G4GP#U0 application, or M37545G4GP#U0 equivalent, this page delivers verified specifications, validated 32-pin LQFP package mapping, confirmed LED/KEY I/O architecture, and two documented alternative parts for remote-control MCU selection.
Technical Context
The M37545G4GP#U0 implements a single-chip 740-family CPU with fixed f(XIN)/4 clock division, supporting WIT and STP instructions for power management. Its interrupt system includes 7 sources (3 external, 3 timer-based, 1 software) with dedicated INT0/INT1 pins on P20/P21.
It integrates three independent 8-bit timers (Timer 1–3), where Timer 2 and Timer 3 jointly generate 455 kHz carrier wave output on P42/CARR. The voltage drop detection circuit (typ. 1.75 V) and built-in power-on reset are active in the PLQP0032GB-A package variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 740-family 8-bit CPU with 71 basic instructions and 2.00 µs minimum instruction execution time at 4 MHz |
| Memory | 16,384-byte QzROM (user area: 16,254 bytes); 512-byte RAM (384-byte RAM1 + 128-byte RAM2) |
| Operating Voltage | 1.8–3.6 V at 4 MHz XIN frequency - enables battery-powered IR remotes using alkaline or lithium cells |
| Carrier Wave Output | Dedicated 455 kHz IR carrier generation via P42/CARR pin using Timer 2 + Timer 3 synchronization |
| LED/Key I/O | P20–P27 support high-current LED drive; P00–P07 provide 8-key-on-wakeup inputs with programmable pull-up |
| Power Management | WIT instruction reduces current to 0.3 mA; STP instruction achieves 0.1 µA stop mode with full oscillator halt |
| Voltage Monitoring | Built-in voltage drop detection circuit (typ. 1.75 V at 25 °C) triggers reset without external components |
Pinout & Package
Package: PLQP0032GB-A - 32-pin plastic LQFP, 0.8 mm pitch, exposed pad not specified, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC / VSS | Power supply / Ground | VCC accepts 1.8–3.6 V; VSS is digital ground reference for all logic and I/O |
| VDDR | RAM2 power supply | Dedicated 0.1 µF bypass capacitor required between VDDR and VSS; connects to VSS if unused |
| CNVSS | Chip operating mode control | Must be hardwired to VSS to enable normal operation; no pull-up/pull-down options |
| RESET | Open-drain reset I/O | Active-low system reset output; internal pull-up; driven low by watchdog, POR, or voltage drop detection |
| XIN / XOUT | Crystal/resonator interface | Connects to external ceramic resonator or quartz crystal (4 MHz typical) for clock generation |
| P00/KEY0 – P07/KEY7 | Programmable key-input port | 8-bit bidirectional port with software-selectable pull-up and key-on-wakeup interrupt capability |
| P20(LED0)/INT0 – P27(LED7) | LED-driving I/O with interrupt | High-current sink/source capable; P20 and P21 double as INT0/INT1 external interrupt inputs |
| P42/CARR | Carrier wave output | Dedicated 455 kHz IR carrier signal output; CMOS 3-state structure for direct connection to IR LED driver |
Key Features
| Feature | Design Value |
|---|---|
| Integrated IR carrier generation | Hardware-synchronized 455 kHz waveform on P42 eliminates need for external oscillator or timing IC |
| Low-voltage operation | Full functionality down to 1.8 V enables use with single-cell lithium or two-cell alkaline batteries |
| Key-on-wakeup capability | 8 programmable wake-up inputs (P00–P07) allow immediate MCU activation from deep sleep without external logic |
| LED-driving I/O | P20–P27 deliver sufficient current to drive standard IR LEDs directly, reducing BOM count |
| On-chip voltage monitoring | Voltage drop detection at 1.75 V provides brown-out protection without external supervisor IC |
Applications
| IR Remote Control Transmitter | Consumer Electronics Remote |
|---|---|
Use Scenario: Battery-powered handheld remote sending NEC or RC-5 protocol commands to TVs, set-top boxes, or audio receivers. IC Role / Device Role / Timing Role: Primary controller executing IR encoding, timing carrier bursts, and managing key scan and LED drive. Use Value: Integrated 455 kHz carrier generation and P2x LED drive eliminate external timing and driver components, reducing PCB area and cost. | Use Scenario: Compact universal remote supporting multiple device types with multi-key matrix and status LEDs. IC Role / Device Role / Timing Role: Central MCU handling key decoding, protocol selection, LED feedback, and low-power sleep/wake cycles. Use Value: 8-key-on-wakeup inputs and STP-mode 0.1 µA current enable multi-year battery life in always-on standby. |
| Home Appliance Remote | Industrial Remote Interface |
Use Scenario: Remote for air conditioners or washing machines requiring robust key debounce, LED indicators, and noise-immune IR transmission. IC Role / Device Role / Timing Role: System-on-chip managing mechanical key inputs, status LED patterns, and precise 455 kHz carrier envelope timing. Use Value: Built-in voltage drop detection ensures reliable reset during battery depletion, preventing erratic command transmission. | Use Scenario: Ruggedized remote for HVAC or lighting control in commercial buildings with extended temperature requirements. IC Role / Device Role / Timing Role: Embedded controller operating across −20 to +85 °C, driving high-brightness IR LEDs under variable supply conditions. Use Value: 1.8–3.6 V operating range and industrial-grade temperature rating ensure stable performance in unregulated power environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit IR remote control MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M37545G4KP | Same 16 KB ROM/512-byte RAM, but in PLSP0032JB-A SSOP package (0.65 mm pitch); lacks VDDR pin | Preferred for space-constrained PCBs where fine-pitch SSOP is acceptable; no separate RAM2 power rail | Select when board layout favors SSOP and dual-power-rail RAM is unnecessary |
| M37545G6GP | 24 KB ROM, same 512-byte RAM and PLQP0032GB-A package; identical peripheral set and pinout | Suitable for remotes requiring larger firmware (e.g., multi-protocol support or enhanced UI features) | Drop-in upgrade path when additional ROM capacity is needed without hardware revision |
Compared with M37545G4GP#U0, M37545G4KP offers identical functionality in a smaller SSOP footprint but removes VDDR flexibility, while M37545G6GP provides 8 KB more ROM in the same LQFP package - enabling firmware expansion without layout changes.
Availability
M37545G4GP#U0 is available at Aetrix Electronics and suitable for infrared remote control transmitters, consumer electronics remotes, and home appliance control systems requiring stable component supply over extended production lifecycles.
Supply support for M37545G4GP#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 specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT applications.
The 7545 Group was designed specifically for ultra-low-power infrared remote control transmitters, integrating carrier generation, LED drive, and key-scan logic into a single 8-bit MCU platform.
FAQ
What is the maximum operating frequency of the M37545G4GP#U0?
The M37545G4GP#U0 uses an internal clock divider that fixes CPU speed to f(XIN)/4. With a 4 MHz external ceramic resonator or crystal on XIN/XOUT, the core executes at 1 MHz. The datasheet confirms 2.00 µs minimum instruction time at this frequency, and no higher XIN frequency is supported for this variant. M37545G4GP#U0 does not support overclocking or alternate clock configurations beyond the specified 4 MHz input.
Does the M37545G4GP#U0 support in-circuit programming or debugging?
The M37545G4GP#U0 contains QzROM and does not support in-system programming. Programming requires a parallel programmer interfacing with the dedicated programming pins (not exposed in standard operation). Renesas documentation states read/write access to QzROM is disabled after setting ROM code protect at address FFDB₁₆. M37545G4GP#U0 has no debug interface such as JTAG or SWD; emulator support is limited to the RLSS variant (M37545RLSS), not this part.
Can the M37545G4GP#U0 drive standard infrared LEDs directly?
Yes - the M37545G4GP#U0's P20–P27 port pins are explicitly rated for high-current LED drive per the datasheet. Each pin supports sink/source sufficient for common IR LEDs (e.g., TSAL6200) without external transistors. The functional block diagram and pin description confirm P2x outputs are optimized for LED loads, and the "large current for driving LED" specification applies directly to M37545G4GP#U0 in its PLQP0032GB-A package.
What is the purpose of the VDDR pin on the M37545G4GP#U0?
The VDDR pin supplies power exclusively to RAM2 (128 bytes) on the M37545G4GP#U0. This allows RAM2 to retain data during deep-stop modes while main VCC is reduced or removed. A 0.1 µF bypass capacitor must be placed between VDDR and VSS. If RAM2 retention is not required, VDDR must be tied to VSS - leaving it floating violates the absolute maximum ratings and risks undefined behavior. This dual-power architecture is unique to M37545G4GP#U0 among 7545 Group variants in LQFP packaging.
Is the M37545G4GP#U0 qualified for automotive applications?
No - the M37545G4GP#U0 is classified as a "Standard" quality grade device per Renesas' product categorization. Its specified operating temperature range is −20 to +85 °C, and documentation explicitly restricts use to computers, office equipment, communications gear, audio/video devices, home appliances, and industrial robots. Automotive applications (e.g., body controllers or infotainment remotes) require "High Quality" grade parts with AEC-Q100 qualification, which M37545G4GP#U0 does not possess.
M37545G4GP#U0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- Series:
- 740/38000
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 740
- Core Size:
- 8-Bit
- Speed:
- 4MHz
- Connectivity:
- -
- Peripherals:
- LED, LVD, POR, WDT
- Number of I/O:
- 25
- Program Memory Size:
- 16KB (16K x 8)
- Program Memory Type:
- QzROM
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 3.6V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
M37545G4GP#U0 FAQ
1.How can I place an order for M37545G4GP#U0 through Aetrix?
Please submit a Request for Quotation (RFQ) for M37545G4GP#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 M37545G4GP#U0 reliable?
The price and inventory of M37545G4GP#U0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M37545G4GP#U0 is usually 5 days.
3.What payment methods are accepted for M37545G4GP#U0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M37545G4GP#U0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M37545G4GP#U0?
M37545G4GP#U0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M37545G4GP#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 M37545G4GP#U0?
For technical support, including M37545G4GP#U0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M37545G4GP#U0 requirements.
6.How does Aetrix verify that M37545G4GP#U0 is sourced from the original manufacturer or authorized distributors?
All M37545G4GP#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 M37545G4GP#U0 meets industry standards.
7.What is the process for return or replacement of M37545G4GP#U0?
All M37545G4GP#U0 units undergo pre-shipment inspection (PSI). If there is an issue with M37545G4GP#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 M37545G4GP#U0 part is unused and in its original packaging.
Return procedure for M37545G4GP#U0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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