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Renesas R5F121BCGFP#50
- Part No.:
- R5F121BCGFP#50
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BCGFP#50.pdf
- Description:
- 16BIT MCU RL78/G16 32K 32LQFP -4
- Quantity:
- Payment:
- Shipping:
Inventory:4,830
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Product details
Overview
R5F121BCGFP#50 from Renesas Electronics is a 32-pin LQFP-packaged 16-bit RL78/G16 microcontroller with 32 KB code flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU), designed for industrial human-machine interface applications operating from −40°C to +105°C. It features an RL78 CPU core (3-stage pipeline), 16-bit timer array (8 channels), 10-bit A/D converter (11 analog inputs), and dual serial interfaces including UART, simplified SPI (CSI), and I²C.
For engineers reviewing the R5F121BCGFP#50 datasheet, R5F121BCGFP#50 pinout, R5F121BCGFP#50 application, or R5F121BCGFP#50 equivalent, key selection criteria include industrial temperature grade (−40°C to +105°C), LQFP-32 package compatibility, on-chip CTSU for touch button implementation, and support for background-free data flash rewriting at VDD = 2.4–5.5 V.
Technical Context
The R5F121BCGFP#50 implements the RL78 CPU core with CISC architecture, supporting configurable instruction execution time 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 erase blocks), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB SRAM.
Peripheral integration includes a 10-bit A/D converter with internal reference (0.815 V), two comparators, real-time clock with calendar and alarm, watchdog timer, and capacitive touch sensing unit supporting self- and mutual-capacitance modes across up to 16 keys. Serial connectivity comprises up to three CSI channels, three UART channels, three simplified I²C channels, and one full I²C channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | RL78 16-bit CISC with 3-stage pipeline; supports variable instruction timing (0.0625–30.5 μs) |
| Flash Memory | 32 KB code flash (1 KB erase blocks); 1 KB data flash (512 B blocks, 1,000,000 TYP. rewrites) |
| RAM | 2 KB on-chip SRAM for program/data storage and stack operations |
| Operating Voltage | 2.4 V to 5.5 V single supply; enables direct interface with 3.3 V and 5 V logic systems |
| Temperature Range | −40°C to +105°C (G-grade industrial); validated for extended thermal cycling in control panels |
| A/D Converter | 10-bit resolution, 11-channel input, internal 0.815 V reference, and temperature sensor support |
| Capacitive Touch | 15-channel CTSU supporting self-capacitance (15 keys) or mutual-capacitance matrix (up to 16 keys) |
Pinout & Package
32-pin plastic LQFP (7.0 × 7.0 mm, 0.8-mm pitch), RoHS-compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also serves as serial array output and tool interface TX |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | UART receive input with analog input capability (ANI0); supports debug communication and sensor interface |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sensing input (TSCAP); also provides analog input, buzzer drive, and voltage comparator output |
| P125 | RESET / INTP1 | Active-low reset input with interrupt capability; requires external pull-up for reliable power-on initialization |
| VDD | Power Supply | Main 2.4–5.5 V supply rail; decoupling capacitor required adjacent to pin for noise immunity |
| VSS | Ground | Digital ground reference; must be low-impedance connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | Halt and Stop modes enable sub-μA current draw; 61-μA/MHz active current at TA = 125°C supports battery-backed HMI |
| Integrated CTSU | 15-channel capacitive touch sensing unit eliminates need for external touch controller IC in appliance control panels |
| Industrial temp grade | G-grade qualification (−40°C to +105°C) ensures reliability in factory automation and HVAC control environments |
| On-chip debug | Full on-chip debug functionality via TOOL0/TOOLRxD/TOOLTxD pins; no external JTAG emulator required |
| Flexible clocking | High-speed on-chip oscillator (1–16 MHz, ±1.0% accuracy at TA = −20 to +85°C) reduces BOM cost vs. external crystal |
Applications
| Appliance Control Panel | Industrial HMI Terminal |
|---|---|
Use Scenario: Touch-enabled front panel for washing machines, microwaves, or dishwashers with LED indicators and buzzer feedback. IC Role / Device Role / Timing Role: Main system controller executing UI logic, reading capacitive touch keys, driving buzzer (PCLBUZ0), and managing display backlight via PWM timers. Use Value: Integrated CTSU and 10-bit A/D eliminate external touch IC and analog front-end components; G-grade temp range ensures operation inside hot appliance enclosures. | Use Scenario: Compact operator interface for PLC-connected machinery with status LEDs, emergency stop monitoring, and serial diagnostics. IC Role / Device Role / Timing Role: Real-time coordinator of I/O scanning, safety interlock checking (INTP0–INTP9), and UART-based Modbus RTU communication to host controller. Use Value: 8-channel 16-bit timer array enables precise pulse-width modulation for LED dimming and motor control signals; −40°C to +105°C rating sustains uptime in unconditioned factory floors. |
| Smart Thermostat | Energy Meter Interface Module |
Use Scenario: Residential thermostat with ambient temperature sensing, humidity compensation, and wireless module control via UART. IC Role / Device Role / Timing Role: Sensor hub aggregating data from internal temperature sensor and external analog sensors (ANI0–ANI10), managing RTC calendar, and scheduling RF wake-ups. Use Value: On-chip temperature sensor and 0.815 V internal reference enable accurate analog measurements without external precision references; RTC with alarm supports programmable heating cycles. | Use Scenario: DIN-rail mounted metering accessory that reads pulse outputs from utility meters and transmits data via RS-485. IC Role / Device Role / Timing Role: Isolated serial gateway translating pulse counts into Modbus frames using UART and hardware timer capture (TI00–TI07). Use Value: Dual UART channels allow simultaneous local debug (TOOLRxD/TOOLTxD) and field bus communication (RxD1/TxD1); 11-channel A/D monitors auxiliary supply rails and isolation status. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMFP#50 | M-grade variant: extended temperature range (−40°C to +125°C); identical pinout, memory, and peripherals | Required for under-hood automotive or high-ambient industrial environments exceeding +105°C | Select when ambient operating temperature exceeds +105°C; otherwise, R5F121BCGFP#50 offers optimal cost/performance for standard industrial use. |
| R5F121BAGFP#50 | A-grade variant: reduced code flash (16 KB), same 2 KB RAM, identical package and peripheral set | Suitable for cost-sensitive consumer HMI where firmware footprint <16 KB and −40°C to +85°C suffices | Choose for lower-cost designs with smaller firmware; verify flash usage margin before downgrading from 32 KB. |
Compared with R5F121BCMFP#50 and R5F121BAGFP#50, the R5F121BCGFP#50 delivers the optimal balance of industrial temperature margin (+105°C), full 32 KB flash headroom for feature-rich firmware, and LQFP-32 layout compatibility-making it the default choice for new industrial HMI designs requiring long-term supply stability.
Availability
R5F121BCGFP#50 is available at Aetrix Electronics and suitable for industrial HMI terminals, appliance control panels, and smart thermostat designs requiring stable component supply, long lifecycle support, and guaranteed industrial temperature performance.
Supply support for R5F121BCGFP#50 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 industrial, automotive, and IoT markets.
The RL78/G16 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, space-constrained human-machine interface applications requiring integrated touch sensing, robust serial connectivity, and industrial-grade reliability.
FAQ
What is the maximum operating frequency of the R5F121BCGFP#50?
The R5F121BCGFP#50 supports a maximum CPU operating frequency of 16 MHz using its high-speed on-chip oscillator. This yields a minimum instruction execution time of 0.0625 μs. The device also supports lower-frequency operation down to 32.768 kHz for ultra-low-power RTC and sleep modes, with corresponding instruction timing of 30.5 μs.
Does the R5F121BCGFP#50 support in-system programming via its serial interfaces?
Yes, the R5F121BCGFP#50 supports self-programming of its code and data flash memory using the on-chip debug interface accessed through TOOL0, TOOLRxD, and TOOLTxD pins. It does not support background operation during data flash rewriting-code execution halts while data flash is being written-but full in-system programming is enabled without external programmers.
How many capacitive touch channels does the R5F121BCGFP#50 provide, and what configurations are supported?
The R5F121BCGFP#50 integrates a 15-channel capacitive touch sensing unit (CTSU). It supports self-capacitance mode (one key per pin, up to 15 keys) and mutual-capacitance matrix mode (transmit/receive pin pairing from the same 15 pins, supporting up to 16 keys). Configuration is software-selectable via the CTSU control registers.
What is the data flash endurance specification for the R5F121BCGFP#50?
The R5F121BCGFP#50 specifies a data flash endurance of 1,000,000 write/erase cycles (typical) at VDD = 2.4 V to 5.5 V. Each rewrite operates on 32-bit units, and the 1 KB data flash is organized in two 512-byte blocks. Background operation (BGO) is not supported-code execution is suspended during data flash writes.
Is the R5F121BCGFP#50 pin-compatible with other RL78/G16 variants in LQFP-32 packaging?
Yes, the R5F121BCGFP#50 is fully pin-compatible with all other RL78/G16 devices in the 32-pin LQFP package (e.g., R5F121BAGFP#50, R5F121BCMFP#50), sharing identical pin functions, electrical characteristics, and mechanical footprint. Firmware portability between G-, A-, and M-grade variants is maintained, with differences limited to temperature rating and flash size.
R5F121BCGFP#50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- Series:
- RL78/G16
- Packaging:
- Tape & Reel (TR)
- 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:
R5F121BCGFP#50 FAQ
1.How can I place an order for R5F121BCGFP#50 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCGFP#50 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 R5F121BCGFP#50 reliable?
The price and inventory of R5F121BCGFP#50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCGFP#50 is usually 5 days.
3.What payment methods are accepted for R5F121BCGFP#50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCGFP#50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCGFP#50?
R5F121BCGFP#50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCGFP#50 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 R5F121BCGFP#50?
For technical support, including R5F121BCGFP#50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCGFP#50 requirements.
6.How does Aetrix verify that R5F121BCGFP#50 is sourced from the original manufacturer or authorized distributors?
All R5F121BCGFP#50 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 R5F121BCGFP#50 meets industry standards.
7.What is the process for return or replacement of R5F121BCGFP#50?
All R5F121BCGFP#50 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCGFP#50, 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 R5F121BCGFP#50 part is unused and in its original packaging.
Return procedure for R5F121BCGFP#50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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