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Renesas R5F121BCAFP#30
- Part No.:
- R5F121BCAFP#30
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BCAFP#30.pdf
- Description:
- MCU:RL78
- Quantity:
- Payment:
- Shipping:
Inventory:930
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Product details
Overview
R5F121BCAFP#30 from Renesas Electronics is a 32-pin LQFP-packaged 16-bit RL78/G16 microcontroller with 32 KB code flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU), designed for low-power industrial control and human-machine interface applications operating from 2.4 to 5.5 V.
For engineers reviewing the R5F121BCAFP#30 datasheet, R5F121BCAFP#30 pinout, R5F121BCAFP#30 application, or R5F121BCAFP#30 equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-chain support tailored for embedded design validation and production planning.
Technical Context
The R5F121BCAFP#30 implements the RL78 CPU core with a 3-stage pipeline, supporting instruction execution times from 0.0625 μs (@16 MHz) to 30.5 μs (@32.768 kHz), and features an on-chip high-speed oscillator with ±1.0% accuracy over −20 to +85°C. It integrates a 12-bit interval timer, watchdog timer, and real-time clock with 99-year calendar and alarm functions.
Its analog subsystem includes an 8/10-bit A/D converter with up to 11 input channels, internal reference voltage (0.815 V), temperature sensor, and dual comparators. Communication interfaces comprise up to three simplified SPI (CSI), three UART, three simplified I²C, and one full I²C channel - all configurable via peripheral I/O redirection registers (PIOR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | RL78 16-bit CISC with 3-stage pipeline, 1 MB address space |
| Flash Memory | 32 KB code flash (1 KB block size); supports self-programming without boot swap |
| Data Flash | 1 KB data flash (512 B blocks); 1,000,000 write cycles; 32-bit rewrite unit |
| Operating Voltage | 2.4 V to 5.5 V single supply; supports HALT and STOP low-power modes |
| Temperature Range | −40°C to +125°C (M-grade industrial qualification) |
| Capacitive Touch | 15-channel CTSU supporting self- and mutual-capacitance methods (up to 16 keys) |
| A/D Converter | 8/10-bit resolution; 4–11 analog inputs; internal 0.815 V reference and temperature sensor |
Pinout & Package
32-pin plastic LQFP package (7.0 × 7.0 mm, 0.8-mm pitch), RoHS-compliant, with exposed die pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | Serial TX / Clock Output | SO00/TxD0 output; supports RTC1HZ, TI02/TO02, SCK11/SCL11, SI11/SDA11, SCLA0 |
| P01 | Serial RX / Analog Input | SI00/RxD0/SDA00 input; ANI0 analog input; TS00 touch sense; INTP5 interrupt |
| P02 | Touch Sense / Buzzer / Clock | TSCAP touch input; PCLBUZ0 buzzer output; ANI1 analog input; VCOUT0 voltage monitor; TI01/TO01 timer I/O |
| P125 | System Reset / Interrupt | RESET̅ active-low reset input; INTP1/INTP0 interrupt; VCOUT0/VCOUT1 voltage monitor outputs; SI11 serial input |
| VDD / VSS | Power Supply | Dedicated 32-pin LQFP power pins; decoupling required per Renesas layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power operation | 61 µA/MHz typical operating current at TA = 125°C; HALT/STOP modes reduce system power in idle states |
| Integrated capacitive touch | 15-channel CTSU enables robust, noise-immune touch buttons/sliders without external components |
| Flexible clocking | On-chip high-speed oscillator (1–16 MHz, ±1.0% accuracy) eliminates need for external crystal in cost-sensitive designs |
| Hardware-assisted serial | Simplified SPI (CSI), UART, and I²C peripherals with automatic baud rate generation and FIFO buffering |
| Industrial-grade reliability | M-grade qualification (−40°C to +125°C), on-chip SPOR reset, and background-independent data flash rewriting |
Applications
| Home Appliance Control Panel | Industrial Sensor Node |
|---|---|
Use Scenario: Touch-enabled front panel for microwave ovens or washing machines with LED feedback and motor control. IC Role / Device Role / Timing Role: Main system controller executing UI logic, driving buzzer (PCLBUZ0), reading capacitive keys (CTSU), and managing PWM motor drivers via timer outputs. Use Value: Single-chip integration of touch, timing, and serial comms reduces BOM count and PCB area versus discrete MCU + touch controller solutions. | Use Scenario: Battery-powered environmental sensor node measuring temperature/humidity and transmitting data via UART to gateway. IC Role / Device Role / Timing Role: Low-power host MCU acquiring analog sensor data (ANI0–ANI10), performing RTC-stamped logging, and waking periodically via interval timer to transmit via UART. Use Value: 61 µA/MHz operation and STOP mode extend battery life; integrated temperature sensor and reference enable accurate calibration without external components. |
| Smart HVAC Thermostat | Factory Automation I/O Module |
Use Scenario: Wall-mounted thermostat with ambient temperature sensing, LCD display, and wireless module interface. IC Role / Device Role / Timing Role: Central controller reading thermistor (via ANIx), driving LCD segments (via PCLBUZ0/TOOL pins), and communicating with RF transceiver via simplified I²C (SCLA0/SDAA0). Use Value: On-chip 0.815 V reference ensures stable ADC readings across voltage and temperature; RTC2 provides precise timekeeping for scheduling. | Use Scenario: DIN-rail mounted digital I/O expansion module for PLC systems with isolated inputs/outputs. IC Role / Device Role / Timing Role: Local intelligence unit monitoring opto-isolated inputs (INTP0–INTP9), controlling relay drivers via GPIO, and reporting status via RS-485 (UART + external transceiver). Use Value: 10 external interrupt channels (INTP0–INTP9) enable fast response to field events; M-grade temp range ensures operation in hot control cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMFP#30 | Same 32 KB flash, 2 KB RAM, LQFP-32 package, but M-grade (−40°C to +125°C) vs. G-grade (−40°C to +105°C) thermal spec | Identical peripheral set and pinout; differs only in maximum junction temperature rating | Select R5F121BCMFP#30 for deployments exceeding +105°C ambient, e.g., under-hood automotive or enclosed industrial enclosures |
| R5F121BCGFP#30 | Same silicon, same package, but G-grade (−40°C to +105°C); otherwise identical electrical and functional specs | Valid for industrial environments where +105°C is sufficient; lower cost than M-grade variant | Choose R5F121BCGFP#30 when thermal margin allows - no design changes needed beyond qualification testing |
Compared with R5F121BCAFP#30, both R5F121BCMFP#30 and R5F121BCGFP#30 share identical pinout, memory, peripherals, and firmware compatibility - differing solely in qualified operating temperature range, enabling direct substitution based on thermal requirements without hardware or software modification.
Availability
R5F121BCAFP#30 is available at Aetrix Electronics and suitable for industrial control panels, smart home HMI devices, and factory automation sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BCAFP#30 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/G16 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and thermally demanding embedded applications requiring integrated analog, touch, and communication peripherals.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for the R5F121BCAFP#30?
The R5F121BCAFP#30 supports a maximum operating frequency of 16 MHz using its on-chip high-speed oscillator, delivering a minimum instruction execution time of 0.0625 μs. This timing is achievable with the high-speed on-chip oscillator enabled and applies across the full VDD (2.4–5.5 V) and temperature (−40°C to +125°C) range specified for the M-grade device.
Does the R5F121BCAFP#30 support background operation during data flash rewriting?
No, the R5F121BCAFP#30 does not support background operation (BGO) during data flash rewriting. Instructions cannot be executed from code flash memory while data flash is being rewritten, requiring careful sequencing of firmware updates to avoid system lockup or missed real-time deadlines.
How many capacitive touch sensing channels does the R5F121BCAFP#30 provide, and what configurations are supported?
The R5F121BCAFP#30 integrates a 15-channel Capacitive Touch Sensing Unit (CTSU) supporting both self-capacitance (up to 15 independent keys) and mutual-capacitance (matrix configuration supporting up to 16 keys) methods. All channels are accessible via dedicated TSCAP and TSxx pins mapped to GPIO ports P00–P23.
What serial communication interfaces are available on the R5F121BCAFP#30, and how are they multiplexed?
The R5F121BCAFP#30 provides up to three simplified SPI (CSI), three UART, three simplified I²C, and one full I²C interface. These are multiplexed across GPIO pins (e.g., P00–P07, P10–P17, P20–P23) and dynamically assigned using the Peripheral I/O Redirection Registers (PIOR0–PIOR6), enabling flexible pin mapping without hardware redesign.
Is the R5F121BCAFP#30 pin-compatible with other RL78/G16 variants in the same LQFP-32 package?
Yes, the R5F121BCAFP#30 is pin-compatible with all other RL78/G16 devices in the 32-pin LQFP package (e.g., R5F121BAAFP#30, R5F121BCGFP#30, R5F121BCMFP#30), sharing identical pin functions, electrical characteristics, and mechanical footprint - enabling drop-in replacement based on memory size or temperature grade requirements.
R5F121BCAFP#30 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- Series:
- RL78/G16
- Packaging:
- Tray
- Product Status:
- Last Time Buy
- Programmable:
- -
- Core Processor:
- RL78
- Core Size:
- 16-Bit
- Speed:
- 16MHz
- Connectivity:
- CSI, I2C, SPI, UART/USART
- Peripherals:
- Capacitive Touch, POR, PWM, Voltage Detect, WDT
- Number of I/O:
- 29
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 1K x 8
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.4V ~ 5.5V
- Data Converters:
- A/D 11x8/10b
- Oscillator Type:
- External, Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BCAFP#30 FAQ
1.How can I place an order for R5F121BCAFP#30 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCAFP#30 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 R5F121BCAFP#30 reliable?
The price and inventory of R5F121BCAFP#30 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCAFP#30 is usually 5 days.
3.What payment methods are accepted for R5F121BCAFP#30?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCAFP#30 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCAFP#30?
R5F121BCAFP#30 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCAFP#30 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 R5F121BCAFP#30?
For technical support, including R5F121BCAFP#30 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCAFP#30 requirements.
6.How does Aetrix verify that R5F121BCAFP#30 is sourced from the original manufacturer or authorized distributors?
All R5F121BCAFP#30 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 R5F121BCAFP#30 meets industry standards.
7.What is the process for return or replacement of R5F121BCAFP#30?
All R5F121BCAFP#30 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCAFP#30, 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 R5F121BCAFP#30 part is unused and in its original packaging.
Return procedure for R5F121BCAFP#30:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BCAFP#30 Tags
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