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Renesas R5F121BAANA#20
- Part No.:
- R5F121BAANA#20
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
R5F121BAANA#20.pdf
- Description:
- MCU:RL78
- Quantity:
- Payment:
- Shipping:
Inventory:1,960
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Product details
Overview
R5F121BAANA#20 from Renesas Electronics is a 32-pin, 16-bit RL78/G16 microcontroller with 16 KB code flash, 2 KB RAM, and industrial-grade operation up to +125°C. It integrates an 8/10-bit ADC (11-channel), capacitive touch sensing unit (15-channel), real-time clock with calendar, and low-power HALT/STOP modes - deployed in motor control subsystems for HVAC actuators.
For engineers reviewing the R5F121BAANA#20 datasheet, R5F121BAANA#20 pinout, R5F121BAANA#20 application, or R5F121BAANA#20 equivalent, key selection criteria include its HWQFN-32 package, 2.4–5.5 V supply range, 16 KB flash with 1 KB data flash, CTSU support, and compatibility with Renesas' E2 studio and CS+ development tools.
Technical Context
The R5F121BAANA#20 implements the RL78 CPU core with a 3-stage pipeline, supporting instruction execution times from 0.0625 μs (@16 MHz) to 30.5 μs (@32.768 kHz). Its memory subsystem includes 16 KB code flash (1 KB block size), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB on-chip RAM.
Peripheral integration includes eight 16-bit timers, one 12-bit interval timer, watchdog timer, RTC2 with alarm and correction, up to three simplified SPI/CSI channels, three UARTs, three simplified I²C interfaces, one full I²C interface, two comparators, and a 15-channel capacitive touch sensing unit (CTSU) supporting self- and mutual-capacitance configurations.
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 erase blocks); no boot swap function |
| Data Flash | 1 KB (512 B blocks; 32-bit rewrite unit; 1,000,000 TYP. rewrites) |
| RAM | 2 KB on-chip SRAM |
| Operating Voltage | 2.4 V to 5.5 V - enables direct battery (3.0 V Li-ion or 4.5–5.5 V 3xAA) interfacing without LDO |
| Temperature Range | −40°C to +125°C (M-grade industrial qualification) |
| Package | 32-pin HWQFN (5.0 × 5.0 mm, 0.5 mm pitch) with exposed die pad |
Pinout & Package
32-pin HWQFN (5.0 × 5.0 mm, 0.5 mm pitch) with exposed thermal pad requiring PCB land pattern per Renesas specification PWQN0032KE-A. Pin 1 marked by index notch; exposed pad must be soldered to non-electrical thermal plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P125 | RESET/INTP1/VCOUT0/INTP0 | Active-low reset input with internal SPOR; dual interrupt capability; voltage output reference |
| P00 | TOOLTxD/INTP6/SO00/TxD0/RTC1HZ | UART0 transmit; serial output; programmable 1 Hz RTC output; interrupt source |
| P01 | TOOLRxD/ANI0/INTP5/TS00/TI02/TO02/SI00/RxD0/SDA00 | UART0 receive; analog input 0; touch sense channel 0; timer I/O; I²C data line |
| P02 | PCLBUZ0/ANI1/VCOUT0/INTP7/TSCAP/TI01/TO01/SCK00/SCL00 | Buzzer driver; analog input 1; voltage output; touch sensor CAP pin; SPI clock/I²C clock |
| VDD / VSS | Power Supply / Ground | Dual power pins (pins 7 & 8) enable low-noise analog/digital separation; decoupling required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Touch Sensing Unit (CTSU) | 15-channel self-capacitance or matrix-based mutual-capacitance support - enables robust, low-BOM touch panels without external ICs |
| Low-Power Operation Modes | HALT and STOP modes reduce current to µA-level; supports fast wake-up from 32.768 kHz subsystem clock |
| On-Chip Debug Function | Fully integrated debug interface via TOOL0/TOOLRxD/TOOLTxD pins - eliminates need for external debugger hardware |
| High-Speed On-Chip Oscillator | Factory-trimmed 16/8/4/2/1 MHz options with ±1.0% accuracy (−20 to +85°C) - removes external crystal for cost-sensitive designs |
| Real-Time Clock 2 (RTC2) | 99-year calendar with alarm, periodic interrupt, and auto-correction - enables time-stamped logging without external RTC |
Applications
| Smart Thermostat Interface | HVAC Actuator Control |
|---|---|
Use Scenario: Residential smart thermostat with capacitive touch buttons, temperature/humidity sensing, and wireless connectivity. IC Role / Device Role / Timing Role: Main system controller managing touch UI, sensor acquisition, RTC-based scheduling, and UART communication to Wi-Fi module. Use Value: Integrated CTSU and 11-channel ADC eliminate external touch controller and signal-conditioning circuitry; M-grade temp rating ensures reliability in wall-mounted enclosures. | Use Scenario: Motorized damper actuator in commercial HVAC systems requiring precise position feedback and thermal resilience. IC Role / Device Role / Timing Role: Real-time motion controller using PWM outputs, analog current sensing, and fault monitoring via comparator inputs. Use Value: Eight 16-bit timers enable synchronized motor phase control and encoder capture; +125°C rating sustains operation near hot ductwork. |
| Industrial Panel Meter | Programmable Logic Relay |
Use Scenario: DIN-rail mounted panel meter displaying voltage/current measurements with local configuration via pushbuttons. IC Role / Device Role / Timing Role: Data acquisition and display manager with analog front-end, buzzer feedback, and nonvolatile parameter storage. Use Value: 1 KB data flash provides reliable, high-endurance storage for calibration coefficients and user settings without external EEPROM. | Use Scenario: Compact, reprogrammable relay module replacing electromechanical units in factory automation cabinets. IC Role / Device Role / Timing Role: Logic sequencer executing ladder logic via software, driving solid-state outputs, and monitoring discrete inputs. Use Value: 32-pin HWQFN footprint allows dense PCB layout; HALT mode reduces standby power to extend battery backup runtime during mains loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCANA#20 | 32 KB code flash (vs. 16 KB); same package, peripherals, and temp grade | Required where firmware complexity exceeds 16 KB or future-proofing for feature expansion is needed | Select when bootloader, OTA update, or rich GUI logic necessitates larger code space |
| R5F121BAMFP#30 | LQFP-32 (7×7 mm, 0.8 mm pitch) vs. HWQFN-32; identical electrical specs and peripheral set | Suitable for legacy PCBs with LQFP footprints or manual assembly environments | Choose for ease of prototyping, rework, or compatibility with existing LQFP-based designs |
Compared with R5F121BCANA#20 and R5F121BAMFP#30, the R5F121BAANA#20 offers optimal balance of compact thermal performance (HWQFN), industrial temperature margin (+125°C), and sufficient code density for mid-complexity embedded control - making it ideal for space-constrained, thermally demanding applications where flash headroom is not critical.
Availability
R5F121BAANA#20 is available at Aetrix Electronics and suitable for HVAC actuator control, smart thermostat interfaces, industrial panel meters, and programmable logic relays requiring stable component supply across extended temperature ranges.
Supply support for R5F121BAANA#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 delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, thermally demanding embedded control applications - combining integrated analog peripherals, capacitive touch, and robust industrial qualification.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for the R5F121BAANA#20?
The R5F121BAANA#20 supports a maximum high-speed operation of 16 MHz using the on-chip oscillator, delivering a minimum instruction execution time of 0.0625 μs. This timing assumes high-speed on-chip oscillator activation and applies across the full −40°C to +125°C industrial temperature range specified for the M-grade device.
Does the R5F121BAANA#20 support background data flash rewriting while executing code from main flash?
No, the R5F121BAANA#20 does not support background operation (BGO) for data flash. During data flash rewriting, instruction execution from code flash memory is halted. The device requires careful sequencing - typically entering a safe state, disabling interrupts, and executing the rewrite sequence before resuming normal operation.
How many analog input channels and what resolution does the ADC in the R5F121BAANA#20 provide?
The R5F121BAANA#20 features an 8/10-bit successive approximation register (SAR) ADC with up to 11 analog input channels (ANI0–ANI10). Resolution is selectable per conversion, and the ADC operates across the full 2.4–5.5 V supply range, with internal reference voltage (0.815 V TYP.) and temperature sensor support.
What is the purpose of the exposed thermal pad on the R5F121BAANA#20 HWQFN package?
The exposed die pad on the R5F121BAANA#20's HWQFN package serves as the primary thermal path to the PCB. Renesas specifies that it must be soldered to a non-electrical copper area for effective heat dissipation - critical for maintaining junction temperature within limits during sustained operation at +125°C ambient.
Can the R5F121BAANA#20 operate without an external crystal or resonator?
Yes, the R5F121BAANA#20 can operate entirely from its factory-trimmed high-speed on-chip oscillator (selectable 1–16 MHz) and dedicated low-speed on-chip oscillator (32.768 kHz). External timing components are optional - used only when higher frequency stability or precision than ±1.0% is required.
R5F121BAANA#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BAANA#20 FAQ
1.How can I place an order for R5F121BAANA#20 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAANA#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 R5F121BAANA#20 reliable?
The price and inventory of R5F121BAANA#20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAANA#20 is usually 5 days.
3.What payment methods are accepted for R5F121BAANA#20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAANA#20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAANA#20?
R5F121BAANA#20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAANA#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 R5F121BAANA#20?
For technical support, including R5F121BAANA#20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAANA#20 requirements.
6.How does Aetrix verify that R5F121BAANA#20 is sourced from the original manufacturer or authorized distributors?
All R5F121BAANA#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 R5F121BAANA#20 meets industry standards.
7.What is the process for return or replacement of R5F121BAANA#20?
All R5F121BAANA#20 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAANA#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 R5F121BAANA#20 part is unused and in its original packaging.
Return procedure for R5F121BAANA#20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BAANA#20 Tags
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