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Renesas R5F121BCGNA#00
- Part No.:
- R5F121BCGNA#00
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
R5F121BCGNA#00.pdf
- Description:
- 16BIT MCU RL78/G16 32K 32HWQFN -
- Quantity:
- Payment:
- Shipping:
Inventory:3,205
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Product details
Overview
R5F121BCGNA#00 from Renesas Electronics is a 32-pin RL78/G16 16-bit microcontroller with 32 KB code flash, 2 KB RAM, and industrial-grade operation up to +105°C. It integrates an 8/10-bit ADC (11-channel), capacitive touch sensing unit (15-channel), real-time clock with calendar, and multiple serial interfaces including UART, simplified SPI (CSI), simplified I²C, and full I²C - deployed in smart home appliance control panels requiring low-power HMI and sensor fusion.
For engineers reviewing the R5F121BCGNA#00 datasheet, R5F121BCGNA#00 pinout, R5F121BCGNA#00 application, or R5F121BCGNA#00 equivalent, key selection criteria include its HWQFN-32 (5 × 5 mm, 0.5 mm pitch) package, G-grade temperature range (−40 to +105°C), 32 KB flash with 1 KB data flash, CTSU-based touch interface support, and dual-voltage operation (2.4–5.5 V).
Technical Context
The R5F121BCGNA#00 implements the RL78 CPU core with a 3-stage pipeline CISC architecture, supporting instruction execution times from 0.0625 μs (@16 MHz high-speed on-chip oscillator) to 30.5 μs (@32.768 kHz subsystem clock). Its memory subsystem includes 32 KB code flash (1 KB block size), 1 KB data flash (512 B block, 1M rewrite cycles), and 2 KB on-chip RAM.
Peripheral integration centers on mixed-signal capability: an 11-channel 8/10-bit A/D converter with internal reference (0.815 V), two comparators with selectable reference sources, a 15-channel capacitive touch sensing unit (CTSU) supporting self- and mutual-capacitance modes, and eight 16-bit timer channels plus RTC2 with 99-year calendar and alarm functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | RL78 16-bit CISC CPU with 3-stage pipeline |
| Flash Memory | 32 KB code flash; 1 KB data flash with 1,000,000 write cycles |
| RAM | 2 KB on-chip SRAM |
| Operating Voltage | 2.4 V to 5.5 V single supply - enables direct battery or unregulated rail operation |
| Temperature Range | −40°C to +105°C (G-grade industrial) |
| A/D Converter | 8/10-bit resolution, 11 analog inputs, internal 0.815 V reference |
| Capacitive Touch | 15-channel CTSU supporting self-capacitance (15 keys) or mutual-capacitance (up to 16 keys) |
| Package | HWQFN-32, 5.0 × 5.0 mm, 0.5 mm pitch, exposed die pad |
Pinout & Package
Package: HWQFN-32 (5.0 × 5.0 mm, 0.5 mm pitch) with exposed thermal pad requiring non-electrical PCB soldering per Renesas specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | Serial TX / Clock output | SO00/TxD0 primary UART transmit; supports SCK11/SCL11 and SCLA0 for multi-interface routing |
| P01 | Serial RX / Analog input | SI00/RxD0/SDA00 primary UART receive; ANI0 input with touch sensing (TS00) |
| P02 | Touch sense / Buzzer / Timer | TSCAP for capacitive touch; PCLBUZ0 for buzzer drive; TI01/TO01 for timer I/O |
| P125 | Reset / Interrupt input | RESET̅ active-low reset with optional SPOR level selection; also serves as INTP1/INTP0 |
| VDD / VSS | Power supply rails | Dual power pins support stable core/peripheral voltage delivery; exposed pad must be thermally anchored |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power HALT/STOP modes | Enables sub-μA standby current - critical for battery-powered 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 |
| Background data flash writes | Not supported; requires code flash suspension during data flash rewrite - mandates careful firmware sequencing |
| Real-time clock with calendar | RTC2 provides 99-year calendar, alarm, and clock correction - enables time-stamped logging without external RTC |
| Hardware debug interface | On-chip debug with no boot swap required - simplifies field firmware updates and validation |
| Peripheral I/O redirection | PIOR registers allow dynamic remapping of serial, timer, and interrupt functions - increases PCB layout flexibility |
Applications
| Smart Appliance Control Panel | Industrial Sensor Node |
|---|---|
Use Scenario: Touch-enabled front panel for washing machine or HVAC system with LED indicators and buzzer feedback. IC Role / Device Role / Timing Role: Main controller executing UI logic, reading CTSU inputs, driving buzzer via PCLBUZ0, managing RTC2 for cycle timing, and communicating via UART to main MCU. Use Value: Single-chip integration of touch, timing, and communication reduces BOM count and PCB area versus discrete solutions. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and air quality in factory settings. IC Role / Device Role / Timing Role: Sensor aggregator using 11-channel ADC for analog sensors, RTC2 for periodic wake-up, and STOP mode for ultra-low sleep current. Use Value: G-grade temperature rating (−40 to +105°C) ensures reliability in harsh industrial enclosures without forced cooling. |
| Energy Meter Interface Module | Medical Patient Monitor Frontend |
Use Scenario: Isolated communication bridge between metrology IC and display/control MCU in smart electricity meters. IC Role / Device Role / Timing Role: UART-to-I²C protocol translator with CRC-protected data framing; uses simplified I²C (Simplified I2C) for slave device control. Use Value: Dual serial interface support (UART + I²C + CSI) enables flexible inter-IC communication without external level shifters or bridges. | Use Scenario: Low-noise front-end for patient-worn vital sign sensors (ECG, SpO₂) with tactile feedback. IC Role / Device Role / Timing Role: Signal conditioner using internal comparator (IVCMP0/1) and ADC; CTSU for non-invasive touch controls; operates at 2.4 V minimum for extended battery life. Use Value: On-chip 0.815 V reference and temperature sensor enable calibrated analog measurements without external references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCGFP#00 | LQFP-32 (7 × 7 mm, 0.8 mm pitch); identical flash/RAM/peripherals but different thermal and routing characteristics | Suitable for through-hole prototyping or legacy LQFP-based designs; less compact than HWQFN | Select when board space allows larger footprint or reflow compatibility with existing LQFP tooling is required |
| R5F1217CGNA#00 | 24-pin HWQFN; 32 KB flash, 2 KB RAM, but only 10 analog inputs and 7 CTSU channels | Lower I/O count and reduced touch channel count - fits simpler HMI or sensor-only roles | Choose for cost-optimized or space-constrained designs where full 32-pin I/O and 15-channel CTSU are unnecessary |
Compared with R5F121BCGFP#00, the R5F121BCGNA#00 offers superior thermal performance and smaller PCB footprint in HWQFN; compared with R5F1217CGNA#00, it delivers expanded analog input count (+1 channel), full 15-channel CTSU, and additional serial interface pins - making it optimal for feature-rich industrial HMI.
Availability
R5F121BCGNA#00 is available at Aetrix Electronics and suitable for smart appliance control panels, industrial sensor nodes, energy meter interface modules, and medical patient monitor frontends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BCGNA#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 management ICs for automotive, industrial, and IoT markets.
The RL78/G16 product line delivers true low-power performance (61 µA/MHz at 125°C) with integrated capacitive touch, RTC, and robust peripheral sets - designed specifically for cost-sensitive, battery-operated, and industrial HMI applications.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for the R5F121BCGNA#00?
The R5F121BCGNA#00 achieves a maximum operating frequency of 16 MHz using its high-speed on-chip oscillator. At this speed, the minimum instruction execution time is 0.0625 μs. This timing is confirmed in the RL78/G16 datasheet (R01DS0431EJ0130 Rev.1.30, Section 1.1 Features) and applies directly to the R5F121BCGNA#00 variant within the G-grade industrial temperature range.
Does the R5F121BCGNA#00 support background data flash programming while executing code from flash memory?
No, the R5F121BCGNA#00 does not support background operation (BGO) for data flash writes. The datasheet explicitly states that instructions cannot be executed from code flash memory while rewriting data flash. Firmware must enter a safe state - such as HALT mode - before initiating data flash operations. This constraint applies identically across all RL78/G16 variants, including the R5F121BCGNA#00.
What are the exact package dimensions and thermal pad requirements for the R5F121BCGNA#00?
The R5F121BCGNA#00 uses a HWQFN-32 package measuring 5.0 × 5.0 mm with 0.5 mm pitch. Its exposed die pad must be soldered to a non-electrical plated PCB area per Renesas specification (R01DS0431EJ0130, Page 7, Remark 3). This thermal pad is not electrically connected and serves only for heat dissipation - incorrect grounding or routing violates the R5F121BCGNA#00's mechanical and thermal design requirements.
How many capacitive touch sensing channels does the R5F121BCGNA#00 support, and what configurations are available?
The R5F121BCGNA#00 integrates a 15-channel capacitive touch sensing unit (CTSU). It supports self-capacitance mode (one pin per key, up to 15 keys) and mutual-capacitance mode (matrix configuration using selected transmit/receive pins from the same 15 pins, supporting up to 16 keys). These capabilities are specified in the R5F121BCGNA#00's functional outline (R01DS0431EJ0130, Section 1.1 Features) and apply exclusively to the 32-pin G/M-grade variants.
What is the guaranteed data flash endurance and operating voltage range for rewrites on the R5F121BCGNA#00?
The R5F121BCGNA#00 guarantees 1,000,000 rewrite cycles (typical) for its 1 KB data flash memory, with rewrites permitted across the full operating voltage range of VDD = 2.4 V to 5.5 V. This specification is documented in the "Data flash memory" subsection of Section 1.1 Features (R01DS0431EJ0130 Rev.1.30) and is consistent across all R5F121BCx variants, including the R5F121BCGNA#00.
R5F121BCGNA#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:
- 32KB (32K 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:
R5F121BCGNA#00 FAQ
1.How can I place an order for R5F121BCGNA#00 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCGNA#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 R5F121BCGNA#00 reliable?
The price and inventory of R5F121BCGNA#00 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCGNA#00 is usually 5 days.
3.What payment methods are accepted for R5F121BCGNA#00?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCGNA#00 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCGNA#00?
R5F121BCGNA#00 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCGNA#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 R5F121BCGNA#00?
For technical support, including R5F121BCGNA#00 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCGNA#00 requirements.
6.How does Aetrix verify that R5F121BCGNA#00 is sourced from the original manufacturer or authorized distributors?
All R5F121BCGNA#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 R5F121BCGNA#00 meets industry standards.
7.What is the process for return or replacement of R5F121BCGNA#00?
All R5F121BCGNA#00 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCGNA#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 R5F121BCGNA#00 part is unused and in its original packaging.
Return procedure for R5F121BCGNA#00:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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