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Renesas R5F121BAAFP#30
- Part No.:
- R5F121BAAFP#30
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BAAFP#30.pdf
- Description:
- MCU:RL78
- Quantity:
- Payment:
- Shipping:
Inventory:1,690
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Product details
Overview
R5F121BAAFP#30 from Renesas Electronics is a 32-pin LQFP-packaged RL78/G16 16-bit microcontroller with 16 KB code flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU), designed for low-power industrial human-machine interface applications operating from 2.4–5.5 V across −40°C to +85°C.
For engineers reviewing the R5F121BAAFP#30 datasheet, R5F121BAAFP#30 pinout, R5F121BAAFP#30 application, or R5F121BAAFP#30 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts for embedded control and touch-enabled systems.
Technical Context
The R5F121BAAFP#30 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 function.
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 UART channels, three simplified I²C channels, and one full I²C interface - all configurable via peripheral I/O redirection registers (PIOR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | RL78 16-bit CISC 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 V to 5.5 V - enables direct battery or unregulated supply operation |
| Temp Range | −40°C to +85°C (A-grade consumer/industrial ambient) |
| A/D Converter | 8/10-bit resolution, 11-channel input, internal 0.815 V reference, temperature sensor |
| Capacitive Touch | 15-channel CTSU supporting self- and mutual-capacitance modes for up to 16 keys |
| Timers | Eight 16-bit timer array channels; one 12-bit interval timer; one watchdog timer |
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 | TOOLTxD / SO00 / TxD0 | UART0 transmit output; serial array unit output; supports tool interface and general-purpose serial communication |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | UART0 receive input; 10-bit A/D input channel 0; serial array unit input; debug and data acquisition path |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Buzzer/tone generator output; analog input 1; voltage comparator output; capacitive touch sense electrode |
| P125 | RESET / INTP1 | Active-low reset input with selectable power-on-reset threshold; external interrupt source |
| VDD | Power Supply | Main digital supply (2.4–5.5 V); powers core, peripherals, and I/O banks |
| VSS | Ground | Digital ground reference; must be low-impedance connection for stable ADC and touch operation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power HALT/STOP modes | Enables sub-μA sleep current - critical for battery-powered HMI and metering applications |
| On-chip high-speed oscillator | 16/8/4/2/1 MHz selection with ±1.0% accuracy (−20°C to +85°C) eliminates external crystal cost and board space |
| Data flash memory | 1 KB with 512 B block size and 1,000,000 write cycles - supports robust parameter storage without external EEPROM |
| Peripheral I/O redirection (PIOR) | Allows dynamic remapping of serial, timer, and interrupt functions to alternate pins - increases PCB layout flexibility |
| Capacitive touch sensing unit (CTSU) | Hardware-accelerated touch detection with noise immunity - enables reliable button/slider implementation in noisy environments |
Applications
| Home Appliance Control Panel | Industrial Sensor Node |
|---|---|
|
Use Scenario: Touch-based front panel for microwave oven or washing machine with LED feedback and motor control. IC Role / Device Role / Timing Role: Main system controller executing UI logic, reading capacitive touch inputs, driving buzzer and display, and managing appliance timing sequences. Use Value: Integrated CTSU and 16 KB flash eliminate external touch controller and reduce BOM count; 2.4–5.5 V operation supports direct AC/DC adapter input. |
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and air quality with wireless reporting. IC Role / Device Role / Timing Role: Low-power data acquisition hub sampling analog sensors, performing local calibration, and triggering BLE/Wi-Fi transmission via UART. Use Value: STOP mode current and on-chip RTC enable precise wake-up intervals; 11-channel ADC supports multi-sensor integration without external mux. |
| Smart Thermostat Interface | POS Terminal Keypad |
|
Use Scenario: Wall-mounted HVAC thermostat with capacitive buttons, LCD backlight control, and ambient temperature sensing. IC Role / Device Role / Timing Role: Dedicated HMI processor handling touch decoding, thermal compensation, real-time clock management, and display driver interface. Use Value: Built-in temperature sensor and 99-year RTC reduce component count; CTSU supports waterproof overlay design without mechanical switches. |
Use Scenario: Secure retail point-of-sale keypad with tactile feedback, tamper detection, and encrypted key entry. IC Role / Device Role / Timing Role: Keypad controller validating keypress timing, generating audible/visual feedback via PCLBUZ0, and communicating encrypted data over UART to main processor. Use Value: Hardware CTSU provides fast, low-latency key response; 16-bit timers enable precise debounce and anti-tamper pulse monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCAFP#30 | 32 KB code flash (vs. 16 KB), same package and peripheral set | Required when firmware exceeds 16 KB or future-proofing for feature expansion | Select if application requires >16 KB program memory while retaining identical pinout and timing behavior |
| R5F121BAAFP#30 | Same 16 KB flash, but rated for −40°C to +105°C (G-grade) vs. −40°C to +85°C (A-grade) | Suitable for extended-temperature industrial enclosures or automotive cabin modules | Choose for higher ambient temperature reliability without changing hardware design or software stack |
Compared with R5F121BAAFP#30, R5F121BCAFP#30 offers double flash capacity for complex firmware, while R5F121BAAFP#30 extends thermal range to +105°C - both retain identical pinout, peripherals, and toolchain compatibility, enabling seamless migration based on memory or temperature needs.
Availability
R5F121BAAFP#30 is available at Aetrix Electronics and suitable for home appliance control panels, industrial sensor nodes, smart thermostats, and POS terminal keypads requiring stable component supply and long-term production support.
Supply support for R5F121BAAFP#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 management ICs for industrial, automotive, and IoT applications.
The RL78/G16 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and touch-enabled embedded systems - balancing performance, integration, and energy efficiency.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for the R5F121BAAFP#30?
The R5F121BAAFP#30 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 is confirmed in the RL78/G16 datasheet Rev.1.30 under "RL78 CPU core" features and applies directly to the R5F121BAAFP#30 as a member of the A-grade 32-pin LQFP variant family.
Does the R5F121BAAFP#30 support background data flash rewriting while executing code from main flash?
No, the R5F121BAAFP#30 does not support background operation (BGO) for data flash rewriting. As specified in the datasheet, instructions cannot be executed from code flash memory during data flash write operations - requiring careful state management and temporary code relocation if concurrent execution is needed.
How many analog input channels are available on the R5F121BAAFP#30, and what is their resolution?
The R5F121BAAFP#30 provides 11 analog input channels (ANI0–ANI10) with selectable 8-bit or 10-bit resolution. This capability is explicitly documented in the "A/D converter" section of the datasheet and applies to all 32-pin LQFP variants including R5F121BAAFP#30.
What is the purpose of the PCLBUZ0 function on pin P02 of the R5F121BAAFP#30?
On the R5F121BAAFP#30, PCLBUZ0 on pin P02 serves as a programmable clock output for driving external piezoelectric buzzers or generating precise audio tones - a dedicated hardware function confirmed in Table 1-6 of the datasheet for 32-pin LQFP packages.
Is the R5F121BAAFP#30 pin-compatible with other RL78/G16 32-pin LQFP variants like R5F121BAAFP#30 or R5F121BCAFP#30?
Yes, the R5F121BAAFP#30 shares identical pin configuration, electrical characteristics, and peripheral mapping with R5F121BAAFP#30 and R5F121BCAFP#30 - all are 32-pin LQFP (7 × 7 mm, 0.8-mm pitch) devices differing only in temperature grade and flash capacity, as verified in Table 1-1 and Figure 1-1 of the RL78/G16 datasheet.
R5F121BAAFP#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:
- 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#30 FAQ
1.How can I place an order for R5F121BAAFP#30 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAAFP#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 R5F121BAAFP#30 reliable?
The price and inventory of R5F121BAAFP#30 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAAFP#30 is usually 5 days.
3.What payment methods are accepted for R5F121BAAFP#30?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAAFP#30 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAAFP#30?
R5F121BAAFP#30 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAAFP#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 R5F121BAAFP#30?
For technical support, including R5F121BAAFP#30 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAAFP#30 requirements.
6.How does Aetrix verify that R5F121BAAFP#30 is sourced from the original manufacturer or authorized distributors?
All R5F121BAAFP#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 R5F121BAAFP#30 meets industry standards.
7.What is the process for return or replacement of R5F121BAAFP#30?
All R5F121BAAFP#30 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAAFP#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 R5F121BAAFP#30 part is unused and in its original packaging.
Return procedure for R5F121BAAFP#30:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BAAFP#30 Tags
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