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Renesas R5F10278ANA#45
- Part No.:
- R5F10278ANA#45
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
R5F10278ANA#45.pdf
- Description:
- IC MCU 16BIT 8KB FLASH 24HWQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
R5F10278ANA#45 from Renesas Electronics is a 24-pin HWQFN-packaged 16-bit RL78/G12 microcontroller with 8 KB code flash, 2 KB data flash, and 512 B RAM, operating at 1.8–5.5 V and delivering 31 DMIPS at 24 MHz. It integrates an 11-channel 10-bit ADC, dual CSI/I²C interfaces, UART, 4-channel TAU timer, DMA controller, and ultra-low-power STOP/HALT/SNOOZE modes-designed for battery-powered sensor nodes and industrial control panels.
For engineers reviewing the R5F10278ANA#45 datasheet, R5F10278ANA#45 pinout, R5F10278ANA#45 application, or R5F10278ANA#45 equivalent, this page delivers verified specifications, validated pin functions, real-world use cases, and two confirmed alternative parts with documented technical and application differences-enabling rapid selection for low-voltage embedded designs requiring on-chip data retention and mixed-signal integration.
Technical Context
The R5F10278ANA#45 implements the RL78 CPU core with 3-stage pipeline CISC architecture, 1 MB address space, and configurable instruction execution time (0.04167 µs @ 24 MHz). Its high-speed on-chip oscillator supports ±1.0% accuracy across –20 to +85°C, enabling precise timing without external crystals in cost-sensitive applications.
It features dual-channel DMA for zero-CPU-overhead memory transfers, CRC hardware acceleration, RAM/SFR guard for functional safety, and background operation (BGO) during data flash rewriting-making it suitable for firmware-upgradable field devices where reliability and deterministic latency are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | RL78 16-bit CISC with 3-stage pipeline, 1 MB address space, 8×8-bit register banks × 4 |
| Operating Voltage | 1.8 V to 5.5 V - enables direct interface with 1.8/2.5/3.3/5 V peripherals without level shifters |
| Flash Memory | 8 KB code flash + 2 KB data flash - supports self-programming and 1M rewrite cycles for parameter storage |
| ADC | 10-bit resolution, 11 input channels, internal 1.45 V reference - sufficient for thermistor, potentiometer, and voltage monitoring |
| Timers | 4-channel 16-bit TAU + 12-bit interval timer + watchdog - provides PWM generation, periodic interrupts, and system supervision |
| Serial Interfaces | 2× CSI (SPI-like), 2× simplified I²C, 1× UART - enables concurrent communication with sensors, EEPROMs, and host controllers |
| Power Modes | Halt (63 μA/MHz), Stop (0.23 μA), Snooze - extends battery life in intermittent-sensing applications |
Pinout & Package
Package: HWQFN-24 (4 mm × 4 mm, 0.5 mm pitch), exposed die pad (to be connected to VSS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P10/ANI16/PCLBUZ0/SCK00/SCL00 | Port 1 bit 0 / Analog input / Buzzer clock / SPI clock / I²C clock | Multi-function pin supporting timer-driven buzzer output, master SPI clock, or I²C bus clocking |
| P11/ANI17/SI00/RxD0/SDA00/TOOLRxD | Port 1 bit 1 / Analog input / SPI input / UART receive / I²C data / debug RX | Shared serial data path for SPI slave, UART host, I²C peripheral, and on-chip debugger |
| P12/ANI18/SO00/TxD0/TOOLTxD | Port 1 bit 2 / Analog input / SPI output / UART transmit / debug TX | Enables full-duplex UART or SPI communication while retaining analog sensing capability |
| P13/ANI19/TI00/TO00/INTP2 | Port 1 bit 3 / Analog input / Timer input / Timer output / External interrupt | Configurable as capture input, PWM output, or edge-triggered interrupt source for event timing |
| P14/ANI20/TI01/TO01/INTP3 | Port 1 bit 4 / Analog input / Timer input / Timer output / External interrupt | Dual timer channel with interrupt support for quadrature decoding or pulse-width measurement |
| P20/ANI0/AVREFP | Port 2 bit 0 / Analog input / ADC reference positive | Provides dedicated high-impedance reference input for precision analog measurements |
| P21/ANI1/AVREFM | Port 2 bit 1 / Analog input / ADC reference negative | Completes differential reference pair for ratiometric sensor interfacing |
| P22/ANI2 | Port 2 bit 2 / Analog input | General-purpose analog input with programmable gain and sampling control |
| P23/ANI3 | Port 2 bit 3 / Analog input | Additional analog channel supporting temperature sensor or supply rail monitoring |
| P40/KR0/TOOL0 | Port 4 bit 0 / Key return / Debug I/O | Supports matrix keypad scanning or bidirectional debug communication via SWD |
| P41/ANI22/SO01/SDA01/TI02/TO02/INTP1 | Port 4 bit 1 / Analog input / SPI output / I²C data / Timer I/O / Interrupt | High-flexibility pin for mixed-signal timing, communication, and user interaction |
| P42/ANI21/SCK01/SCL01/TI03/TO03 | Port 4 bit 2 / Analog input / SPI clock / I²C clock / Timer I/O | Enables second independent SPI or I²C bus with synchronized timer-based triggering |
| P60/KR4/SCLA0/(TxD0) | Port 6 bit 0 / Key return / I²C clock / UART transmit (remappable) | Hardware I²C master clock with optional UART TX remapping for pin-constrained layouts |
| P61/KR5/SDAA0/(RxD0) | Port 6 bit 1 / Key return / I²C data / UART receive (remappable) | Hardware I²C data line with optional UART RX remapping for flexible peripheral routing |
| P121/KR3/X1/(TI03)/(INTP3) | Port 12 bit 1 / Key return / Crystal input / Timer input / Interrupt | Primary crystal oscillator input with fallback timer capture/interrupt functionality |
| P122/KR2/X2/EXCLK/(TI02)/(INTP2) | Port 12 bit 2 / Key return / Crystal output / External clock / Timer input / Interrupt | Crystal output or external clock input with secondary timer/interrupt capability |
| P125/KR1/SI01/RESET | Port 12 bit 5 / Key return / SPI input / Reset input | Combines SPI slave input with active-low hardware reset for robust system initialization |
| P137/INTP0 | Port 13 bit 7 / External interrupt 0 | Dedicated high-priority interrupt pin for emergency shutdown or wake-from-STOP events |
| VDD | Power supply | Single 1.8–5.5 V supply powering core, flash, and I/O - eliminates need for multiple regulators |
| VSS | Ground | Reference node for analog/digital domains and thermal pad connection point |
| Exposed Die Pad | Thermal and electrical ground | Must be soldered to PCB ground plane for thermal dissipation and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power STOP mode | 0.23 µA typical current draw - enables multi-year battery life in wireless sensor endpoints |
| On-chip data flash | 2 KB with 1,000,000 write cycles and background operation - stores calibration data without halting application code |
| Dual CSI/I²C interfaces | Independent hardware blocks supporting simultaneous SPI sensor reads and I²C EEPROM writes |
| Hardware CRC accelerator | Reduces firmware update verification time by >90% vs. software CRC - critical for OTA security |
| RAM and SFR guard | Prevents accidental overwrites of critical registers or stack - improves runtime stability in noisy environments |
| Peripheral I/O redirection | Dynamic remapping of UART, SPI, and timer pins via PIOR register - simplifies PCB layout and reuse |
Applications
| Smart Home Sensor Hub | Industrial Motor Controller |
|---|---|
Use Scenario: Central node aggregating temperature, humidity, and motion data from multiple Zigbee/Z-Wave end devices before forwarding to cloud gateway. IC Role / Device Role / Timing Role: Main MCU managing RF coexistence, sensor polling, local decision logic, and secure OTA updates. Use Value: Integrated 11-channel ADC and dual I²C interfaces eliminate external signal conditioning ICs; 2 KB data flash stores device-specific calibration and network keys. |
Use Scenario: Closed-loop speed control of 24 V DC brushless motor in HVAC blower using hall-effect feedback and PWM drive. IC Role / Device Role / Timing Role: Real-time motor commutation controller with precise 1 µs timer resolution and fault-safe STOP mode activation. Use Value: 4-channel TAU timer generates synchronized 3-phase PWM; RAM guard prevents corruption during EMI-induced resets; 1.8 V operation supports brown-out detection down to 1.85 V. |
| Portable Medical Monitor | Energy Meter Front-End |
Use Scenario: Battery-powered pulse oximeter acquiring photodiode signals, computing SpO₂, and displaying results on OLED via SPI. IC Role / Device Role / Timing Role: Low-noise analog front-end processor with synchronous sampling, digital filtering, and display interface. Use Value: 10-bit ADC with internal reference enables ratiometric measurement; HALT mode reduces active power to 63 µA/MHz during idle periods between acquisitions. |
Use Scenario: Residential electricity meter measuring voltage/current waveforms, calculating kWh, and communicating via RS-485 Modbus. IC Role / Device Role / Timing Role: Metrology co-processor handling ADC sampling, RMS computation, and isolated serial communication. Use Value: Dual CSI interfaces connect to isolation-coupled ADCs; data flash retains tariff schedules and billing history across power cycles; ±1% oscillator accuracy meets IEC 62053-21 Class 1 timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F10279ANA#45 | 12 KB code flash, same 2 KB data flash, identical pinout and peripherals | Supports larger firmware images with complex protocol stacks (e.g., BLE mesh, Matter) | Select when firmware size exceeds 8 KB or future feature expansion is required |
| R5F10277ANA#45 | 4 KB code flash, same 2 KB data flash, identical pinout and peripherals | Suitable for minimal bootloaders or fixed-function controllers with static logic | Select for cost-sensitive, functionally locked designs where flash headroom is not needed |
Compared with R5F10278ANA#45, R5F10279ANA#45 offers 50% more code flash for protocol stack overhead without changing PCB layout, while R5F10277ANA#45 reduces bill-of-materials cost by 12% in volume production where firmware footprint remains under 4 KB.
Availability
R5F10278ANA#45 is available at Aetrix Electronics and suitable for smart home hubs, industrial motor controllers, portable medical monitors, and energy meter front-ends requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for R5F10278ANA#45 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 is a global semiconductor leader specializing in microcontrollers, analog, and power solutions for automotive, industrial, and IoT markets.
The RL78/G12 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and safety-aware embedded systems requiring integrated analog, communication, and secure firmware update capabilities.
FAQ
What is the maximum operating frequency and corresponding DMIPS rating for the R5F10278ANA#45?
The R5F10278ANA#45 operates at up to 24 MHz using its high-speed on-chip oscillator, delivering 31 DMIPS performance. This benchmark reflects actual instruction throughput under typical conditions, not theoretical peak values. The RL78 core achieves this with its 3-stage pipeline and efficient CISC architecture, making the R5F10278ANA#45 suitable for real-time control tasks in resource-constrained environments.
Does the R5F10278ANA#45 support true hardware I²C or only simplified I²C (SI²C)?
The R5F10278ANA#45 supports two independent simplified I²C (SI²C) interfaces, compliant with standard I²C protocol including START/STOP condition generation, ACK/NACK handling, and 7-bit addressing. While labeled "simplified" in documentation, these modules implement full I²C master functionality and interoperate seamlessly with standard I²C EEPROMs, sensors, and displays without software bit-banging.
Can the R5F10278ANA#45 perform simultaneous read/write operations on code flash and data flash?
No-the R5F10278ANA#45 does not support concurrent code flash and data flash operations. However, it does support background operation (BGO) for data flash: while rewriting data flash memory, the CPU can execute instructions from code flash. Code flash programming requires CPU suspension, but the on-chip debug function and flash shield window provide protection against unintended writes during normal operation.
What is the purpose of the REGC pin, and is it used on the R5F10278ANA#45?
The REGC pin is specific to 30-pin RL78/G12 variants (e.g., R5F102AA series) and connects to an external capacitor for internal voltage regulator stabilization. The R5F10278ANA#45 is a 24-pin HWQFN device and does not include the REGC pin-its internal regulator is fully integrated and requires no external components. This simplifies design and reduces BOM count for compact 24-pin applications.
How many external interrupt sources does the R5F10278ANA#45 support, and which pins are dedicated to them?
The R5F10278ANA#45 supports six external interrupt sources (INTP0–INTP5). Dedicated pins include P137/INTP0, P14/INTP3, P41/INTP1, P13/INTP2, and P121/P122 also support INTP3/INTP2 via alternate functions. All six are independently maskable and prioritizable in hardware, enabling responsive handling of encoder pulses, button presses, or fault signals without CPU polling overhead.
R5F10278ANA#45 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 24-WFQFN Exposed Pad
- Series:
- RL78/G12
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- RL78
- Core Size:
- 16-Bit
- Speed:
- 24MHz
- Connectivity:
- CSI, I2C, UART/USART
- Peripherals:
- DMA, LVD, POR, PWM, WDT
- Number of I/O:
- 18
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 768 x 8
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 5.5V
- Data Converters:
- A/D 11x8/10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F10278ANA#45 FAQ
1.How can I place an order for R5F10278ANA#45 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F10278ANA#45 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 R5F10278ANA#45 reliable?
The price and inventory of R5F10278ANA#45 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F10278ANA#45 is usually 5 days.
3.What payment methods are accepted for R5F10278ANA#45?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F10278ANA#45 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F10278ANA#45?
R5F10278ANA#45 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F10278ANA#45 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 R5F10278ANA#45?
For technical support, including R5F10278ANA#45 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F10278ANA#45 requirements.
6.How does Aetrix verify that R5F10278ANA#45 is sourced from the original manufacturer or authorized distributors?
All R5F10278ANA#45 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 R5F10278ANA#45 meets industry standards.
7.What is the process for return or replacement of R5F10278ANA#45?
All R5F10278ANA#45 units undergo pre-shipment inspection (PSI). If there is an issue with R5F10278ANA#45, 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 R5F10278ANA#45 part is unused and in its original packaging.
Return procedure for R5F10278ANA#45:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F10278ANA#45 Tags
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