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Renesas R5F121BAGNA#20
- Part No.:
- R5F121BAGNA#20
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
R5F121BAGNA#20.pdf
- Description:
- MCU:RL78
- Quantity:
- Payment:
- Shipping:
Inventory:1,960
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Product details
Overview
R5F121BAGNA#20 from Renesas Electronics is a 32-pin, 32 KB flash, 2 KB RAM RL78/G16 16-bit microcontroller with industrial-grade temperature range (−40°C to +105°C), integrated capacitive touch sensing unit (15 channels), and dual 10-bit A/D converter (11-channel analog input). It operates from 2.4–5.5 V and supports real-time clock, watchdog timer, and low-power STOP/HALT modes for battery-powered HMI and sensor interface applications.
For engineers reviewing the R5F121BAGNA#20 datasheet, R5F121BAGNA#20 pinout, R5F121BAGNA#20 application, or R5F121BAGNA#20 equivalent, key selection considerations include its HWQFN-32 (5 × 5 mm, 0.5-mm pitch) package, 32 KB code flash with 1 KB data flash, 16-bit timer array (8 channels), and support for UART/SPI/I²C interfaces in compact industrial control designs.
Technical Context
The R5F121BAGNA#20 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, enabling instruction execution times from 0.0625 μs (@16 MHz high-speed on-chip oscillator) to 30.5 μs (@32.768 kHz subsystem clock). It integrates a dedicated low-speed on-chip oscillator for watchdog operation and a 99-year calendar RTC with alarm and clock correction functions.
Its peripheral set includes a 15-channel capacitive touch sensing unit (CTSU) supporting both self- and mutual-capacitance methods, two comparators with selectable reference sources, and serial interfaces including simplified SPI (up to 3 channels), UART (up to 3 channels), simplified I²C (up to 3 channels), and full I²C (1 channel), all configurable via peripheral I/O redirection registers (PIOR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | RL78 16-bit CISC CPU with 3-stage pipeline and 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 block size); 1,000,000 rewrite cycles at VDD = 2.4–5.5 V |
| Operating Voltage | 2.4 V to 5.5 V single supply; enables direct battery or wide-input industrial rail compatibility |
| Temperature Range | −40°C to +105°C (G-grade industrial); validated for extended thermal environments |
| A/D Converter | 10-bit resolution (also supports 8-bit mode); 11-channel analog input with internal 0.815 V reference and temperature sensor |
| Capacitive Touch | 15-channel CTSU supporting up to 16 keys in mutual-capacitance matrix configuration |
Pinout & Package
Package: HWQFN-32 (5.0 × 5.0 mm, 0.5-mm pitch) with exposed die pad requiring non-electrical PCB thermal pad connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also serves as serial array unit output and clocked serial interface TX |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | UART receive input with analog input capability; supports debug communication and serial data ingress |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sensing input with buzzer drive and voltage comparator output; critical for touch key acquisition |
| P125 | RESET / INTP1 | Active-low reset input with interrupt capability; primary system initialization and fault recovery signal |
| VDD | Power Supply | Core and I/O supply (2.4–5.5 V); decoupling required per QFN thermal pad layout guidelines |
| VSS | Ground | Digital ground reference; must be connected to PCB ground plane beneath exposed die pad |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | 61 µA/MHz active current at TA = 125°C; HALT/STOP modes reduce leakage for battery longevity |
| Integrated RTC | 99-year calendar with alarm, clock correction, and RTC1HZ output-enables time-stamped logging without external IC |
| Hardware CTSU | 15-channel capacitive touch engine with noise immunity algorithms; eliminates need for external touch controller IC |
| Flexible serial interfaces | Up to 3 UART, 3 simplified SPI, 3 simplified I²C, and 1 full I²C-all share pins via PIOR register mapping |
| On-chip debug | Fully integrated on-chip debug function with TOOL0/TOOLRxD/TOOLTxD pins; no external debugger hardware required |
Applications
| Home Appliance Control Panel | Industrial Sensor Node |
|---|---|
Use Scenario: Touch-enabled microwave oven or washing machine front panel with LED indicators and motor control feedback. IC Role / Device Role / Timing Role: Main system controller executing UI logic, reading capacitive touch keys, driving buzzer and display, and managing motor timing via 16-bit timers. Use Value: Single-chip integration of touch sensing, RTC-based cycle timing, and motor PWM reduces BOM count and PCB area versus discrete MCU + touch controller solutions. | Use Scenario: DIN-rail mounted environmental monitor collecting temperature, humidity, and vibration data for cloud upload. IC Role / Device Role / Timing Role: Data acquisition hub with 10-bit A/D conversion, RTC timestamping, and UART-to-LoRaWAN gateway interface. Use Value: −40°C to +105°C rating ensures reliability in uncontrolled enclosures; 1 KB data flash stores calibration coefficients and event logs without external EEPROM. |
| Smart Thermostat Interface | Medical Patient Monitor Frontend |
Use Scenario: Wall-mounted HVAC controller with capacitive slider, ambient light sensing, and wireless update capability. IC Role / Device Role / Timing Role: HMI processor handling touch gestures, ambient ADC readings, real-time scheduling, and secure firmware updates via UART bootloader. Use Value: CTSU supports smooth slider interaction; 32 KB flash accommodates dual-bank OTA update image storage within same die. | Use Scenario: Portable vital sign monitor with ECG lead detection, pulse oximetry interface, and audible alert generation. IC Role / Device Role / Timing Role: Signal conditioning and safety-critical timing controller using watchdog timer, RTC alarm, and comparator-based lead-off detection. Use Value: Dual comparators with internal/external reference support enable robust electrode contact monitoring; STOP mode extends battery life between measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMNA#20 | M-grade variant: extended operating range (−40°C to +125°C); identical flash/RAM/peripherals | Suitable for under-hood automotive or high-temperature industrial environments beyond G-grade limits | Select when ambient exceeds +105°C; otherwise R5F121BAGNA#20 offers optimal cost/performance for standard industrial use |
| R5F121BCGFP#50 | LQFP-32 package (7 × 7 mm, 0.8-mm pitch); same G-grade temp range and memory/peripheral specs | Preferred for through-hole prototyping, manual rework, or legacy PCB layouts requiring larger pitch | Choose for ease of assembly/testing; HWQFN-32 (R5F121BAGNA#20) saves board space in volume production |
Compared with R5F121BCMNA#20, the R5F121BAGNA#20 provides identical functionality at lower thermal specification and cost; compared with R5F121BCGFP#50, it delivers the same features in a 34% smaller footprint ideal for space-constrained industrial modules.
Availability
R5F121BAGNA#20 is available at Aetrix Electronics and suitable for industrial HMI, sensor node, and smart appliance applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for R5F121BAGNA#20 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, power, and SoC solutions for automotive, industrial, and IoT markets.
The RL78/G16 product line targets cost-sensitive, low-power embedded systems requiring integrated analog peripherals, capacitive touch, and industrial temperature resilience-designed specifically for appliance, sensor, and control applications.
FAQ
What is the maximum operating frequency of the R5F121BAGNA#20?
The R5F121BAGNA#20 supports a maximum high-speed on-chip oscillator frequency of 16 MHz, delivering a minimum instruction execution time of 0.0625 μs. This frequency is factory-trimmed for ±1.0% accuracy across −20°C to +85°C and VDD = 2.4–5.5 V, making it suitable for timing-critical control loops without external crystal dependency. The R5F121BAGNA#20 also supports ultra-low-speed operation at 32.768 kHz for RTC and low-power wake-up.
Does the R5F121BAGNA#20 support in-system programming (ISP)?
Yes, the R5F121BAGNA#20 supports self-programming of its 32 KB code flash and 1 KB data flash via on-chip debug interface using TOOL0, TOOLRxD, and TOOLTxD pins-no external programmer required. It implements erase-before-write and flash shield window protection, but does not include boot swap functionality. Firmware updates can be performed in-application using the provided flash API libraries documented in the RL78/G16 User's Manual.
How many capacitive touch channels does the R5F121BAGNA#20 support?
The R5F121BAGNA#20 integrates a dedicated Capacitive Touch Sensing Unit (CTSU) with 15 physical channels. It supports both self-capacitance (up to 15 independent keys) and mutual-capacitance (matrix configuration supporting up to 16 keys) modes. All CTSU functions-including noise cancellation, auto-calibration, and threshold adjustment-are handled in hardware, reducing CPU overhead and enabling responsive touch performance even in electrically noisy industrial environments.
What serial communication interfaces are available on the R5F121BAGNA#20?
The R5F121BAGNA#20 provides multiple serial interfaces: up to three UART channels, up to three simplified SPI (CSI) channels, up to three simplified I²C (SIIC) channels, and one full I²C (IICA) channel. These interfaces share I/O pins and are dynamically assigned via the Peripheral I/O Redirection Register (PIOR), allowing flexible routing without hardware redesign. All interfaces operate across the full VDD range (2.4–5.5 V) and temperature grade (−40°C to +105°C).
Is the R5F121BAGNA#20 pin-compatible with other RL78/G16 variants?
The R5F121BAGNA#20 uses the HWQFN-32 (5 × 5 mm, 0.5-mm pitch) package and shares identical pinout and electrical characteristics with all other 32-pin RL78/G16 devices in the NA package family-including R5F121BAANA#20 (16 KB flash), R5F121BCMNA#20 (M-grade), and R5F121BCANA#20 (A-grade). Pin assignments, multiplexed functions, and power/ground locations are fully consistent, enabling drop-in replacement across flash size and temperature grade variants.
R5F121BAGNA#20 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-WFQFN Exposed Pad
- 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:
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BAGNA#20 FAQ
1.How can I place an order for R5F121BAGNA#20 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAGNA#20 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 R5F121BAGNA#20 reliable?
The price and inventory of R5F121BAGNA#20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAGNA#20 is usually 5 days.
3.What payment methods are accepted for R5F121BAGNA#20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAGNA#20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAGNA#20?
R5F121BAGNA#20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAGNA#20 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 R5F121BAGNA#20?
For technical support, including R5F121BAGNA#20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAGNA#20 requirements.
6.How does Aetrix verify that R5F121BAGNA#20 is sourced from the original manufacturer or authorized distributors?
All R5F121BAGNA#20 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 R5F121BAGNA#20 meets industry standards.
7.What is the process for return or replacement of R5F121BAGNA#20?
All R5F121BAGNA#20 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAGNA#20, 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 R5F121BAGNA#20 part is unused and in its original packaging.
Return procedure for R5F121BAGNA#20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BAGNA#20 Tags
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