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Renesas R5F121BAANA#00
- Part No.:
- R5F121BAANA#00
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
R5F121BAANA#00.pdf
- Description:
- 16BIT MCU RL78/G16 16K 32HWQFN -
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
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Product details
Overview
R5F121BAANA#00 from Renesas Electronics is a 32-pin HWQFN-packaged 16-bit RL78/G16 microcontroller with 16 KB code 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 to 5.5 V.
For engineers reviewing the R5F121BAANA#00 datasheet, R5F121BAANA#00 pinout, R5F121BAANA#00 application, or R5F121BAANA#00 equivalent, this page delivers verified electrical specs, validated 32-pin HWQFN terminal mapping, real-world use cases in touch-enabled industrial panels and sensor nodes, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The R5F121BAANA#00 implements the RL78 CPU core with a 3-stage pipeline, supporting 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 12-bit interval timer, watchdog timer, and RTC with 99-year calendar and alarm functions.
Its peripheral set includes eight 16-bit timers, an 8/10-bit A/D converter with up to 11 analog inputs, two comparators, three simplified SPI (CSI) channels, three UARTs, three simplified I²C interfaces, one full I²C interface, and a dedicated capacitive touch sensing unit (CTSU) supporting self- and mutual-capacitance configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | RL78 16-bit CISC with 3-stage pipeline, 1 MB address space |
| Flash Memory | 16 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 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-capacitance (15 keys) or mutual-capacitance matrix (up to 16 keys) |
| Analog Peripherals | 8/10-bit A/D converter (4–11 channels), 2 comparators, internal reference (0.815 V), temperature sensor |
Pinout & Package
Package: 32-pin HWQFN (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 | UART0 TX / Serial output / Clock output | Primary serial transmit line; supports SO00, TxD0, RTC1HZ, TI02/TO02, SCK11/SCL11, SI11/SDA11, SCLA0 |
| P01 | UART0 RX / Analog input / Touch sense | Primary serial receive line; also serves as ANI0, TS00, SI00/RxD0/SDA00, SI11/SDA11, SO11, SDAA0 |
| P02 | Touch sense / Analog input / Buzzer output | Dedicated TSCAP pin for capacitive sensing; also ANI1, VCOUT0, PCLBUZ0, TI01/TO01, SCK00/SCL00, SO11, SCK20/SCL20 |
| P125 | Reset / Interrupt input / Oscillator output | Active-low reset with internal SPOR; supports INTP1/INTP0, VCOUT0/VCOUT1, SI11 |
| VDD / VSS | Power supply / Ground | Single 2.4–5.5 V supply; dual power/ground pins ensure stable core and I/O rail decoupling |
| P41 | RTC output / Touch sense / Timer I/O | Provides RTC1HZ signal; also TS13, TI03/TO03, SCK20/SCL20, VCOUT0/VCOUT1, INTP3/INTP4, SO11/SDA11 |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power operation | 61 µA/MHz active current at TA = 125°C; HALT/STOP modes reduce system-level energy consumption |
| Integrated capacitive touch | Hardware-accelerated CTSU eliminates external touch controller; supports robust self/mutual capacitance detection |
| Flexible clocking | High-speed on-chip oscillator (1–16 MHz, ±1.0% accuracy @ −20 to +85°C) plus 32.768 kHz subsystem clock |
| Industrial-grade reliability | M-grade qualification (−40°C to +125°C), on-chip SPOR with 3 reset voltage levels, and fail-safe watchdog timer |
| Secure firmware update | Self-programming flash with flash shield window function prevents unauthorized code readout or overwrite |
Applications
| Industrial HMI Panels | Smart Sensor Nodes |
|---|---|
Use Scenario: Touch-enabled operator interface on factory floor HMIs with metal enclosures and EMI exposure. IC Role / Device Role / Timing Role: Main MCU executing touch scan, local logic, and RS-485 communication; RTC provides timestamping for event logs. Use Value: CTSU's noise immunity and M-grade thermal stability ensure reliable key detection across ambient extremes without recalibration. | Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and vibration in remote locations. IC Role / Device Role / Timing Role: System controller managing ADC sampling, low-power sleep scheduling, and UART-to-LoRaWAN gateway handoff. Use Value: 61 µA/MHz active current and STOP mode enable multi-year battery life; integrated RTC enables precise wake-up intervals. |
| Appliance Control Units | Building Automation Controllers |
Use Scenario: Embedded control board in commercial HVAC units requiring fan speed regulation and fault monitoring. IC Role / Device Role / Timing Role: Real-time motor control via PWM outputs (TI0x/TO0x), analog monitoring of thermistors and current sensors, and buzzer feedback. Use Value: Eight 16-bit timers support simultaneous motor phase timing, watchdog supervision, and pulse-width measurement without external ICs. | Use Scenario: DIN-rail mounted lighting controller interfacing with DALI bus and occupancy sensors. IC Role / Device Role / Timing Role: DALI physical layer interface (via UART + level-shifting), capacitive touch for local override, and I²C master for sensor hub management. Use Value: Three simplified I²C and three UART channels allow concurrent DALI, sensor, and debug communications without multiplexing bottlenecks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCANA#00 | 32 KB code flash (vs. 16 KB); identical package, peripherals, and M-grade temp range | Suitable where firmware growth exceeds 16 KB; no hardware change required | Select when future firmware expansion or bootloader+application separation is anticipated |
| R5F121BAAFP#00 | LQFP-32 (7×7 mm, 0.8 mm pitch) vs. HWQFN-32 (5×5 mm, 0.5 mm pitch); same memory and peripherals | Better suited for prototyping or manual assembly; larger footprint eases rework but increases board area | Choose for development boards or cost-sensitive production where thermal performance is secondary to assembly yield |
Compared with R5F121BAANA#00, R5F121BCANA#00 offers double flash capacity for complex firmware while retaining pin compatibility and thermal rating, whereas R5F121BAAFP#00 trades compact HWQFN packaging for LQFP manufacturability-enabling faster design iteration without altering software or peripheral configuration.
Availability
R5F121BAANA#00 is available at Aetrix Electronics and suitable for industrial HMI panels, smart sensor nodes, and appliance control units requiring stable component supply, long-term lifecycle assurance, and M-grade thermal reliability.
Supply support for R5F121BAANA#00 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 with integrated capacitive touch and industrial-grade robustness, targeting cost-sensitive yet reliability-critical embedded systems.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for the R5F121BAANA#00?
The R5F121BAANA#00 achieves a maximum operating frequency of 16 MHz using its high-speed on-chip oscillator, delivering a minimum instruction execution time of 0.0625 μs. This timing assumes high-speed oscillator operation with no wait states; lower frequencies (e.g., 32.768 kHz) extend the cycle to 30.5 μs for ultra-low-power modes. The RL78 core's 3-stage pipeline ensures deterministic timing across all supported clock sources.
Does the R5F121BAANA#00 support background data flash rewriting while executing code from main flash?
No, the R5F121BAANA#00 does not support background operation (BGO) for data flash rewriting. During data flash write/erase operations, instruction execution from code flash memory is halted. This requires careful firmware sequencing-typically entering STOP or HALT mode during flash updates-to avoid bus conflicts. The device specifies 1,000,000 write cycles and 512-byte block erase granularity for its 1 KB data flash.
How many capacitive touch channels does the R5F121BAANA#00 support, and what configurations are available?
The R5F121BAANA#00 integrates a 15-channel capacitive touch sensing unit (CTSU) supporting both self-capacitance and mutual-capacitance methods. In self-capacitance mode, each of the 15 pins operates independently for up to 15 buttons. In mutual-capacitance mode, transmit/receive pin combinations from the same 15-pin pool enable matrix layouts supporting up to 16 keys. All configurations are hardware-accelerated and require no external components.
What is the qualified operating temperature range for the R5F121BAANA#00, and how is it indicated in the part number?
The R5F121BAANA#00 is qualified for −40°C to +125°C operation, denoted by the "M" suffix in its RL78/G16 family classification. This M-grade rating confirms suitability for under-hood automotive modules, industrial motor drives, and other high-temperature environments. The device maintains specified timing, flash endurance, and analog accuracy across this full range, with oscillator accuracy de-rated to ±1.5% at +85°C to +125°C.
Which communication interfaces are available on the R5F121BAANA#00, and how many instances of each are implemented?
The R5F121BAANA#00 provides three simplified SPI (CSI) channels, three UART channels, three simplified I²C (RIIC) channels, and one full I²C (IICA) channel. All serial interfaces support independent clock domains and configurable pin remapping via the Peripheral I/O Redirection Register (PIOR). This allows concurrent use-for example, UART0 for debugging, UART1 for sensor telemetry, and IICA for EEPROM access-without resource contention.
R5F121BAANA#00 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-WFQFN Exposed Pad
- Series:
- RL78/G16
- Packaging:
- Tray
- 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:
R5F121BAANA#00 FAQ
1.How can I place an order for R5F121BAANA#00 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAANA#00 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 R5F121BAANA#00 reliable?
The price and inventory of R5F121BAANA#00 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAANA#00 is usually 5 days.
3.What payment methods are accepted for R5F121BAANA#00?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAANA#00 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAANA#00?
R5F121BAANA#00 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAANA#00 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 R5F121BAANA#00?
For technical support, including R5F121BAANA#00 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAANA#00 requirements.
6.How does Aetrix verify that R5F121BAANA#00 is sourced from the original manufacturer or authorized distributors?
All R5F121BAANA#00 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 R5F121BAANA#00 meets industry standards.
7.What is the process for return or replacement of R5F121BAANA#00?
All R5F121BAANA#00 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAANA#00, 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 R5F121BAANA#00 part is unused and in its original packaging.
Return procedure for R5F121BAANA#00:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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