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Renesas R5F121BAAFP#10
- Part No.:
- R5F121BAAFP#10
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BAAFP#10.pdf
- Description:
- 16BIT MCU RL78/G16 16K 32LQFP -4
- Quantity:
- Payment:
- Shipping:
Inventory:3,994
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Product details
Overview
R5F121BAAFP#10 from Renesas Electronics is a 32-pin LQFP-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 human-machine interface applications operating from 2.4–5.5 V.
For engineers reviewing the R5F121BAAFP#10 datasheet, R5F121BAAFP#10 pinout, R5F121BAAFP#10 application, or R5F121BAAFP#10 equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-chain-ready availability details for embedded design-in and volume procurement.
Technical Context
The R5F121BAAFP#10 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 real-time clock with 99-year calendar and alarm functions.
It features 16-bit timer array unit (8 channels), 8/10-bit A/D converter (11 analog inputs), two comparators with selectable reference sources, and simplified SPI/I²C/UART interfaces - all managed via peripheral I/O redirection registers (PIOR) for flexible pin assignment without hardware redesign.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | RL78 16-bit CISC CPU with 3-stage pipeline and 1 MB address space |
| Flash / RAM | 16 KB code flash (1 KB block size); 2 KB on-chip RAM |
| Operating Voltage | 2.4–5.5 V single supply - enables direct battery or wide-input power rail integration |
| Temp Range | −40°C to +85°C (A-grade) - certified for consumer and industrial ambient environments |
| Touch Sensing | 15-channel capacitive touch sensing unit (CTSU) supporting self- and mutual-capacitance modes |
| ADC | 8/10-bit resolution A/D converter with up to 11 input channels and internal 0.815 V reference |
| Timers | Eight 16-bit timer channels, one 12-bit interval timer, one watchdog timer, and RTC with calendar/alarm |
Pinout & Package
32-pin plastic LQFP package (7.0 × 7.0 mm, 0.8-mm pitch) with exposed thermal pad not electrically connected - requires soldering to non-functional copper pour for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit pin; also supports serial output and timer output functions |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | Primary UART receive with analog input and serial input capability - enables debug + sensor + comms on shared pin |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sensing channel 0 input; also supports buzzer drive and analog input |
| P125 | RESET / INTP1 | Dedicated active-low reset input with interrupt capability - ensures deterministic startup and fault recovery |
| VDD / VSS | Power supply pins | Single 2.4–5.5 V supply; dual ground pins improve noise immunity in mixed-signal operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-power HALT/STOP modes | Reduces current draw to sub-μA levels - extends battery life in portable HMI and sensor nodes |
| On-chip high-speed oscillator | 16/8/4/2/1 MHz options with ±1.0% accuracy (−20 to +85°C) - eliminates external crystal for cost-sensitive designs |
| Data flash memory | 1 KB data flash with 1M-cycle endurance and 32-bit rewrite unit - enables robust parameter storage without external EEPROM |
| Peripheral I/O redirection | Hardware-mapped PIOR registers allow dynamic remapping of serial/timer/ADC functions - increases PCB layout flexibility |
| Capacitive touch sensing unit | 15-channel CTSU with self- and mutual-capacitance support - enables reliable button/slider/knob interfaces with minimal BOM |
Applications
| Home Appliance Control Panel | Industrial Sensor Node |
|---|---|
Use Scenario: Touch-enabled front panel for microwave ovens, washing machines, or air conditioners requiring intuitive UI with backlight dimming and motor control feedback. IC Role / Device Role / Timing Role: Main system controller executing user interface logic, driving display segments, managing touch input, and coordinating motor timing via PWM outputs. Use Value: Integrated CTSU eliminates external touch IC; 16 KB flash accommodates localized language firmware; 2.4–5.5 V operation supports direct AC/DC adapter input. | Use Scenario: Battery-powered environmental monitor deployed in factory settings measuring temperature, humidity, and vibration over extended periods. IC Role / Device Role / Timing Role: Low-power data acquisition hub sampling sensors via ADC, timestamping readings with RTC, and transmitting via UART to gateway. Use Value: STOP mode current <1.5 μA enables multi-year battery life; built-in RTC with calendar avoids external timekeeping IC; 11-channel ADC supports multi-sensor fusion. |
| Smart Thermostat Interface | Medical Patient Monitor Frontend |
Use Scenario: Wall-mounted HVAC controller with capacitive touch buttons, OLED display, and wireless module interface. IC Role / Device Role / Timing Role: Touch processor and communication bridge - handles touch debouncing, display refresh timing, and UART/SPI handshaking with Wi-Fi/BLE module. Use Value: CTSU supports 15-key matrix with mutual capacitance; simplified SPI/I²C peripherals reduce external level-shifter count; −40°C to +85°C rating ensures reliability across climates. | Use Scenario: Bedside patient monitor with touch-responsive controls, LED status indicators, and analog sensor signal conditioning. IC Role / Device Role / Timing Role: Safety-critical frontend MCU managing touch input validation, LED pulse timing, analog sensor biasing, and isolated UART communication to main processor. Use Value: Dual comparator inputs enable precise threshold detection on ECG/SpO₂ signals; on-chip voltage references ensure consistent ADC accuracy; HALT mode allows rapid wake-on-event response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCAFP#10 | 32 KB code flash (vs. 16 KB), same package and peripheral set | Suitable where firmware complexity or future feature expansion requires >16 KB program memory | Select when firmware growth headroom or bootloader partitioning is required - identical pinout and migration path |
| RL78/G14 R5F104GCAFP#30 | 16 KB flash, 1.5 KB RAM, no CTSU, fewer timers (6×16-bit), −40°C to +85°C | Lower-cost option for non-touch applications with reduced peripheral requirements | Choose when touch sensing is unnecessary and BOM cost optimization is prioritized over feature richness |
Compared with R5F121BCAFP#10, the R5F121BAAFP#10 trades flash capacity for lower unit cost while retaining full CTSU and timer functionality; versus RL78/G14 R5F104GCAFP#30, it adds critical touch capability and enhanced timing resources at modest cost premium.
Availability
R5F121BAAFP#10 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 assurance, and traceable sourcing.
Supply support for R5F121BAAFP#10 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 delivers ultra-low-power 16-bit MCUs with integrated capacitive touch sensing, targeting cost-sensitive HMI and sensor-edge applications demanding robustness and design simplicity.
FAQ
What is the maximum operating frequency of the R5F121BAAFP#10?
The R5F121BAAFP#10 supports a maximum CPU operating frequency of 16 MHz using its high-speed on-chip oscillator. Instruction execution time can be as fast as 0.0625 μs under this condition. The device also supports lower-frequency clock sources including 32.768 kHz for ultra-low-power RTC and standby operation - all configurable without external components.
Does the R5F121BAAFP#10 include an integrated debugger interface?
Yes, the R5F121BAAFP#10 includes an on-chip debug function compatible with Renesas E2 emulator and CS+ IDE. It supports full break-and-step debugging, flash programming, and real-time variable monitoring via the TOOLRxD/TOOLTxD pins - eliminating need for dedicated JTAG/SWD headers in most designs.
Can the R5F121BAAFP#10 perform background data flash writes?
No, the R5F121BAAFP#10 does not support background operation (BGO) for data flash writes. During data flash rewriting, CPU instruction execution from code flash memory is halted. This requires careful state management in firmware - typically using STOP mode entry before write sequences to minimize system interruption.
What touch sensing methods does the R5F121BAAFP#10 support?
The R5F121BAAFP#10 supports both self-capacitance (up to 15 independent keys) and mutual-capacitance (matrix configuration supporting up to 16 keys) via its integrated CTSU. Pin assignment for transmit/receive channels is configurable through dedicated CTSU registers, enabling flexible PCB layout for curved surfaces or tight spacing constraints.
Is the R5F121BAAFP#10 pin-compatible with other RL78/G16 variants in LQFP-32 package?
Yes, all RL78/G16 devices in the 32-pin LQFP package - including R5F121BAAFP#10, R5F121BCAFP#10, and R5F121BCMFP#10 - share identical pinouts and mechanical footprint. Differences are limited to flash size (16 KB vs. 32 KB), temperature grade (A vs. G vs. M), and minor peripheral enablement - enabling seamless hardware reuse across product tiers.
R5F121BAAFP#10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- 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:
R5F121BAAFP#10 FAQ
1.How can I place an order for R5F121BAAFP#10 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAAFP#10 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#10 reliable?
The price and inventory of R5F121BAAFP#10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAAFP#10 is usually 5 days.
3.What payment methods are accepted for R5F121BAAFP#10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAAFP#10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAAFP#10?
R5F121BAAFP#10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAAFP#10 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#10?
For technical support, including R5F121BAAFP#10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAAFP#10 requirements.
6.How does Aetrix verify that R5F121BAAFP#10 is sourced from the original manufacturer or authorized distributors?
All R5F121BAAFP#10 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#10 meets industry standards.
7.What is the process for return or replacement of R5F121BAAFP#10?
All R5F121BAAFP#10 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAAFP#10, 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#10 part is unused and in its original packaging.
Return procedure for R5F121BAAFP#10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BAAFP#10 Tags
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