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Renesas R5F121BAAFP#50
- Part No.:
- R5F121BAAFP#50
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BAAFP#50.pdf
- Description:
- 16BIT MCU RL78/G16 16K 32LQFP -4
- Quantity:
- Payment:
- Shipping:
Inventory:3,021
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Product details
Overview
R5F121BAAFP#50 from Renesas Electronics is a 32-pin LQFP-packaged 16-bit RL78/G16 microcontroller with 16 KB flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU), designed for low-power industrial control and HMI applications operating from 2.4–5.5 V across −40°C to +85°C.
For engineers reviewing the R5F121BAAFP#50 datasheet, R5F121BAAFP#50 pinout, R5F121BAAFP#50 application, or R5F121BAAFP#50 equivalent, key selection criteria include its 16 KB code flash capacity, 10-bit A/D converter with up to 11 channels, real-time clock with calendar function, and support for multiple serial interfaces including UART, simplified SPI (CSI), and I²C.
Technical Context
The R5F121BAAFP#50 implements the RL78 CPU core with a 3-stage pipeline CISC architecture, supporting instruction execution times from 0.0625 μs (@16 MHz) to 30.5 μs (@32.768 kHz). It integrates a dedicated subsystem clock domain enabling ultra-low-power STOP and HALT modes.
Its peripheral set includes eight 16-bit timers, one 12-bit interval timer, watchdog timer, RTC2 with 99-year calendar and alarm, and a 15-channel capacitive touch sensing unit (CTSU) supporting both self- and mutual-capacitance configurations - all managed via on-chip peripheral I/O redirection registers (PIOR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | RL78 16-bit CISC with 3-stage pipeline, 1 MB address space |
| Flash Memory | 16 KB code flash (1 KB block size), no boot swap, flash shield window enabled |
| Data Flash | 1 KB data flash (512 B blocks), 1M write cycles, 32-bit rewrite unit |
| RAM | 2 KB on-chip SRAM, banked general-purpose registers (8×8-bit ×4 banks) |
| Operating Voltage | 2.4 V to 5.5 V single supply, SPOR reset with 3-level threshold selection |
| Temperature Range | −40°C to +85°C (A-grade consumer/industrial use case) |
| Package | 32-pin LQFP, 7.0 × 7.0 mm, 0.8 mm pitch, lead-free and RoHS compliant |
Pinout & Package
32-pin plastic LQFP (7.0 × 7.0 mm, 0.8-mm pitch), exposed die pad not electrically connected; compatible with standard reflow profiles for lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | Serial TX / Clock Output | SO00/TxD0 primary UART output; supports RTC1HZ output and SCK11/SCL11 for secondary I²C |
| P01 | Serial RX / Analog Input | SI00/RxD0 primary UART input; ANI0 analog input with TS00 touch sensing capability |
| P02 | Touch Sense / Buzzer / Clock | TSCAP for capacitive touch; PCLBUZ0 for buzzer drive; SCK00/SCL00 for primary I²C interface |
| P125 | Reset / Interrupt Input | RESET̅ active-low reset with internal pull-up; also serves as INTP1/INTP0 interrupt input |
| P41 | RTC Output / Touch Sense | RTC1HZ timing reference output; TS13 touch channel input; supports TI03/TO03 timer functions |
| VDD / VSS | Power Supply | Dedicated 32-pin LQFP power pins: one VDD (pin 8), one VSS (pin 7); decoupling required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power operation | 61 µA/MHz typical active current at TA = 125°C; HALT/STOP modes reduce leakage to sub-µA levels |
| Integrated capacitive touch | 15-channel CTSU supporting self-capacitance (15 keys) or mutual-capacitance matrix (up to 16 keys) without external components |
| Flexible clock system | High-speed on-chip oscillator selectable at 1–16 MHz ±1.0% accuracy (−20°C to +85°C); supports crystal (X1/X2) and external clock inputs |
| Real-time clock with calendar | RTC2 module provides 99-year calendar, alarm, and automatic clock correction using 32.768 kHz sub-system clock |
| Peripheral I/O redirection | PIOR registers enable dynamic remapping of serial, timer, and interrupt functions to alternate pins without hardware change |
Applications
| Home Appliance Control Panel | Industrial Sensor Node |
|---|---|
Use Scenario: Touch-enabled front panel for microwave ovens or washing machines with LED indicators and buzzer feedback. IC Role / Device Role / Timing Role: Main controller executing UI logic, managing CTSU scan, driving buzzer (PCLBUZ0), and updating display via SPI/I²C. Use Value: Eliminates external touch controller IC and reduces BOM cost; RTC2 enables precise cooking timers and power-on scheduling. | Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and occupancy in factory settings. IC Role / Device Role / Timing Role: System-on-chip host managing 10-bit A/D conversion (ANI0–ANI10), low-power wake-up via INTPx, and UART/RS-485 communication. Use Value: 2.4–5.5 V operation supports wide-input DC-DC converters; STOP mode extends battery life beyond 5 years with periodic wake-up. |
| Smart Thermostat Interface | Medical Device Keypad |
Use Scenario: Wall-mounted HVAC controller with capacitive buttons, ambient light sensing, and local display. IC Role / Device Role / Timing Role: Primary MCU handling touch decoding, ambient ADC (IVREF0/IVCMP0), PWM fan control (TI0x/TO0x), and real-time scheduling. Use Value: On-chip CTSU tolerates moisture and glove operation; RTC2 maintains accurate time during mains loss with backup capacitor. | Use Scenario: Patient monitor with tactile feedback keypad requiring ESD-hardened, low-noise HMI in clinical environments. IC Role / Device Role / Timing Role: Dedicated HMI processor isolating touch scanning (TS00–TS14), buzzer alerts (PCLBUZ0), and isolated UART to main CPU. Use Value: CTSU's built-in noise rejection and programmable sensitivity meet IEC 60601-1 EMC requirements; 16 KB flash accommodates safety-certified firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCAFP#50 | 32 KB code flash (vs. 16 KB), same package, identical peripherals and pinout | Required when firmware exceeds 16 KB or future-proofing for feature expansion is needed | Select R5F121BCAFP#50 if application demands >12 KB application code plus bootloader and OTA update space |
| R5F121BAAFP#50 | Same 16 KB flash, but A-grade (−40°C to +85°C) vs. G-grade (−40°C to +105°C) thermal rating | Suitable for consumer-grade products where extended high-temp operation is unnecessary | R5F121BAAFP#50 offers identical functionality at lower cost for non-industrial ambient conditions |
Compared with R5F121BAAFP#50, R5F121BCAFP#50 doubles flash capacity without layout changes, while R5F121BAAFP#50 maintains full functional compatibility with relaxed thermal qualification - enabling cost-optimized sourcing without design revision.
Availability
R5F121BAAFP#50 is available at Aetrix Electronics and suitable for home appliance control panels, industrial sensor nodes, and smart thermostat interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for R5F121BAAFP#50 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 touch-based human-machine interface applications - balancing performance, integration, and energy efficiency.
FAQ
What is the maximum operating frequency and instruction speed of the R5F121BAAFP#50?
The R5F121BAAFP#50 supports a maximum system clock of 16 MHz using its high-speed on-chip oscillator. At this frequency, the minimum instruction execution time is 0.0625 μs. The RL78 core's 3-stage pipeline enables deterministic timing critical for real-time control loops and touch response latency under 10 ms.
Does the R5F121BAAFP#50 support in-circuit debugging and flash programming?
Yes, the R5F121BAAFP#50 includes an on-chip debug function compatible with Renesas E2 emulator and CS+ IDE. It supports self-programming of both code and data flash memory without requiring a bootloader - though flash shield window protection must be configured before deployment to prevent unauthorized writes.
How many analog input channels does the R5F121BAAFP#50 provide, and what resolution is supported?
The R5F121BAAFP#50 integrates an 8/10-bit successive-approximation A/D converter with up to 11 analog input channels (ANI0–ANI10). Resolution is selectable per channel; 10-bit mode provides 1 LSB = VDD/1024, with internal reference voltage (0.815 V TYP.) and temperature sensor available for calibration.
Can the R5F121BAAFP#50 operate reliably in industrial temperature environments?
The R5F121BAAFP#50 is rated for −40°C to +85°C (A-grade), making it suitable for commercial and light industrial applications. For extended industrial operation up to +105°C or +125°C, Renesas offers G-grade (R5F121BAGFP#50) and M-grade (R5F121BAMFP#50) variants in the same 32-pin LQFP package.
What serial communication interfaces are integrated into the R5F121BAAFP#50?
The R5F121BAAFP#50 integrates three simplified SPI (CSI) channels, up to three UART channels, up to three simplified I²C (RIIC) channels, and one full I²C (IICA) channel. All interfaces support independent clock sources and can be remapped via PIOR registers to optimize PCB routing and signal integrity.
R5F121BAAFP#50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- Series:
- RL78/G16
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 16KB (16K 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:
R5F121BAAFP#50 FAQ
1.How can I place an order for R5F121BAAFP#50 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAAFP#50 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 R5F121BAAFP#50 reliable?
The price and inventory of R5F121BAAFP#50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAAFP#50 is usually 5 days.
3.What payment methods are accepted for R5F121BAAFP#50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAAFP#50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAAFP#50?
R5F121BAAFP#50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAAFP#50 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 R5F121BAAFP#50?
For technical support, including R5F121BAAFP#50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAAFP#50 requirements.
6.How does Aetrix verify that R5F121BAAFP#50 is sourced from the original manufacturer or authorized distributors?
All R5F121BAAFP#50 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 R5F121BAAFP#50 meets industry standards.
7.What is the process for return or replacement of R5F121BAAFP#50?
All R5F121BAAFP#50 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAAFP#50, 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 R5F121BAAFP#50 part is unused and in its original packaging.
Return procedure for R5F121BAAFP#50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BAAFP#50 Tags
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