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Renesas R5F121BCGFP#30
- Part No.:
- R5F121BCGFP#30
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BCGFP#30.pdf
- Description:
- MCU:RL78
- Quantity:
- Payment:
- Shipping:
Inventory:1,500
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Product details
Overview
R5F121BCGFP#30 from Renesas Electronics is a 32-pin LQFP-packaged 16-bit RL78/G16 microcontroller with 32 KB code flash, 2 KB RAM, and industrial-grade operation up to +105°C. It integrates capacitive touch sensing (15-channel CTSU), 10-bit A/D converter (11 channels), real-time clock with calendar, and low-power HALT/STOP modes for battery-powered HMI and sensor control applications.
For engineers reviewing the R5F121BCGFP#30 datasheet, R5F121BCGFP#30 pinout, R5F121BCGFP#30 application, or R5F121BCGFP#30 equivalent, key selection criteria include its 32-pin LQFP-0.8mm package, G-grade temperature range (−40°C to +105°C), integrated CTSU for touch buttons/knobs, and dual serial interfaces (I²C + simplified SPI/UART) supporting industrial control panel and smart appliance designs.
Technical Context
The R5F121BCGFP#30 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.0625 μs (16 MHz high-speed mode) to 30.5 μs (32.768 kHz ultra-low-speed mode). Its memory subsystem includes 32 KB on-chip code flash (1 KB block erase), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB RAM.
Peripheral integration includes eight 16-bit timers, one 12-bit interval timer, watchdog timer, RTC with 99-year calendar and alarm, two comparators, and a dedicated capacitive touch sensing unit (CTSU) supporting self- and mutual-capacitance configurations across up to 16 keys. Serial connectivity comprises up to three simplified SPI/CSI channels, three UART channels, three simplified I²C channels, and one full I²C interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | RL78 16-bit CISC CPU with 3-stage pipeline, 1 MB address space |
| Flash Memory | 32 KB code flash (1 KB erase blocks); supports self-programming without boot swap |
| Data Flash | 1 KB data flash (512 B blocks); 1,000,000 write cycles; no background operation during rewrite |
| Operating Voltage | 2.4 V to 5.5 V single supply; enables direct connection to common industrial power rails |
| Temperature Range | −40°C to +105°C (G-grade); qualified for industrial control and factory automation environments |
| Capacitive Touch | 15-channel CTSU supporting self-capacitance (15 keys) or mutual-capacitance matrix (up to 16 keys) |
| A/D Converter | 10-bit resolution, 11 analog input channels, internal reference (0.815 V), temperature sensor, and touch voltage support |
Pinout & Package
32-pin plastic LQFP package (7.0 × 7.0 mm, 0.8-mm pitch), exposed pad not electrically connected; compatible with standard reflow soldering processes and industrial PCB assembly.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary debug UART transmit; configurable as serial output or general-purpose digital port |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | Primary debug UART receive; also serves as first A/D input and serial input |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sense channel; supports both analog input and CTSU electrode drive |
| P125 | RESET / INTP1 | Active-low reset input with internal pull-up; doubles as external interrupt source |
| VDD | Power Supply | Primary 2.4–5.5 V supply rail; decoupling required per datasheet layout guidelines |
| VSS | GND | Digital ground reference; must be connected to system ground plane with low-impedance path |
| P41 | RTC1HZ / TS13 | Real-time clock 1 Hz output; also functions as touch sensing channel for extended CTSU coverage |
| P40 | TOOL0 / INTP2 | On-chip debug interface pin; configurable as external interrupt input for wake-up events |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power operation | 61 µA/MHz active current at TA = 125°C; HALT/STOP modes reduce current to sub-µA levels for battery longevity |
| Integrated capacitive touch | Hardware-accelerated CTSU eliminates need for external touch controller IC in HMI designs |
| Flexible clock system | High-speed on-chip oscillator (1–16 MHz, ±1.0% accuracy) plus 32.768 kHz subsystem clock for RTC independence |
| Robust industrial qualification | G-grade temperature rating (−40°C to +105°C) and 2.4–5.5 V operation ensure reliability in harsh environments |
| Secure firmware update | On-chip debug and self-programming enable field firmware updates without external programmers |
Applications
| Industrial Control Panel | Smart Appliance Interface |
|---|---|
Use Scenario: Front-panel HMI for PLCs, motor drives, and HVAC controllers requiring tactile feedback and environmental resilience. IC Role / Device Role / Timing Role: Main MCU executing control logic, managing capacitive touch inputs, driving display interface, and maintaining RTC-corrected time stamps. Use Value: Integrated CTSU and −40°C to +105°C operation eliminate external touch ICs and thermal derating concerns in factory-floor enclosures. | Use Scenario: User interface for washing machines, ovens, and refrigerators with waterproof touch controls and energy monitoring. IC Role / Device Role / Timing Role: System-on-chip managing touch keys, temperature sensing, motor timing via 16-bit timers, and communication with main application processor. Use Value: 10-bit A/D with internal reference and 11-channel input enable precise thermistor and current-sense measurements without external signal conditioning. |
| Energy Monitoring Module | IoT Sensor Node |
Use Scenario: DIN-rail mounted electricity meter add-on module measuring voltage, current, and power factor in commercial buildings. IC Role / Device Role / Timing Role: Data acquisition MCU sampling analog inputs via 10-bit A/D, computing RMS values, and logging results to data flash with RTC timestamping. Use Value: 1 KB data flash rated for 1 million rewrites ensures reliable long-term energy usage logging over 10+ years of operation. | Use Scenario: Battery-powered wireless sensor node monitoring temperature, humidity, and door/window status in smart building deployments. IC Role / Device Role / Timing Role: Ultra-low-power host MCU entering STOP mode between sensor reads; waking on RTC alarm or external interrupt to process and transmit data. Use Value: 61 µA/MHz active current and sub-µA STOP mode extend coin-cell battery life beyond 5 years in periodic-readout configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMFP#30 | M-grade variant: extended temperature range (−40°C to +125°C); identical pinout and peripherals | Suitable for under-hood automotive or high-temperature industrial environments where +105°C is insufficient | Select when ambient operating temperature exceeds +105°C; otherwise, G-grade R5F121BCGFP#30 offers cost and qualification advantage |
| R5F121BAFP#30 | 16 KB code flash (vs. 32 KB); same 32-pin LQFP package, G-grade temp, and peripheral set | Fits simpler control tasks with smaller firmware footprint; reduces BOM cost where full 32 KB is unnecessary | Choose for cost-sensitive applications with firmware size ≤16 KB; retains identical hardware compatibility and layout reuse |
Compared with R5F121BCMFP#30 and R5F121BAFP#30, the R5F121BCGFP#30 delivers optimal balance of industrial temperature margin (+105°C), memory capacity (32 KB flash), and feature integration-making it the default choice for new industrial HMI and sensor-control designs where future firmware expansion or moderate thermal headroom is required.
Availability
R5F121BCGFP#30 is available at Aetrix Electronics and suitable for industrial control panels, smart appliance interfaces, and energy monitoring modules requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for R5F121BCGFP#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 solutions for industrial, automotive, and IoT markets.
The RL78/G16 product line delivers true low-power performance with integrated capacitive touch sensing, targeting cost-sensitive yet robust embedded applications in industrial HMI, home appliances, and sensor nodes.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for the R5F121BCGFP#30?
The R5F121BCGFP#30 supports 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 assumes high-speed mode configuration and accounts for the RL78's 3-stage pipeline architecture, enabling deterministic real-time response in control loops and interrupt service routines.
Does the R5F121BCGFP#30 support in-system programming without external hardware?
Yes, the R5F121BCGFP#30 supports on-chip debug and self-programming functionality. Firmware updates can be performed in-system via the built-in TOOL0/TOOLRxD/TOOLTxD debug interface without requiring an external programmer. The device does not implement boot swap, so updates must be managed with care to avoid corruption during power loss.
How many capacitive touch channels does the R5F121BCGFP#30 provide, and what configurations are supported?
The R5F121BCGFP#30 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 matrix mode (transmit/receive pin pairing from the same 15 pins, supporting up to 16 keys). Both modes operate independently of the main CPU, enabling low-power touch detection during HALT mode.
What are the key differences between the R5F121BCGFP#30 and the R5F121BCMFP#30?
The R5F121BCGFP#30 and R5F121BCMFP#30 share identical pinout, peripherals, and 32 KB flash/2 KB RAM configuration. Their primary difference is temperature grade: R5F121BCGFP#30 is rated for −40°C to +105°C (G-grade), while R5F121BCMFP#30 extends to −40°C to +125°C (M-grade). Electrical specifications and packaging (32-pin LQFP) are otherwise identical.
Can the R5F121BCGFP#30 operate from a 3.3 V supply, and what is its A/D reference voltage option?
Yes, the R5F121BCGFP#30 operates across 2.4 V to 5.5 V, fully supporting standard 3.3 V systems. Its 10-bit A/D converter offers multiple reference options: external VDD, internal 0.815 V reference (typical), or dedicated IVREF0/IVREF1 pins. This flexibility allows accurate measurement of sensors with varying output ranges without external voltage references.
R5F121BCGFP#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:
- 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#30 FAQ
1.How can I place an order for R5F121BCGFP#30 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCGFP#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 R5F121BCGFP#30 reliable?
The price and inventory of R5F121BCGFP#30 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCGFP#30 is usually 5 days.
3.What payment methods are accepted for R5F121BCGFP#30?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCGFP#30 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCGFP#30?
R5F121BCGFP#30 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCGFP#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 R5F121BCGFP#30?
For technical support, including R5F121BCGFP#30 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCGFP#30 requirements.
6.How does Aetrix verify that R5F121BCGFP#30 is sourced from the original manufacturer or authorized distributors?
All R5F121BCGFP#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 R5F121BCGFP#30 meets industry standards.
7.What is the process for return or replacement of R5F121BCGFP#30?
All R5F121BCGFP#30 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCGFP#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 R5F121BCGFP#30 part is unused and in its original packaging.
Return procedure for R5F121BCGFP#30:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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