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Renesas R5F121BCAFP#10
- Part No.:
- R5F121BCAFP#10
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BCAFP#10.pdf
- Description:
- 16BIT MCU RL78/G16 32K 32LQFP -4
- Quantity:
- Payment:
- Shipping:
Inventory:3,146
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Product details
Overview
R5F121BCAFP#10 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 low-power industrial HMI and sensor interface applications operating from 2.4–5.5 V.
For engineers reviewing the R5F121BCAFP#10 datasheet, R5F121BCAFP#10 pinout, R5F121BCAFP#10 application, or R5F121BCAFP#10 equivalent, key selection criteria include its 32-pin LQFP-0.8mm package, −40°C to +125°C industrial temperature grade (M), 16-bit RL78 CPU core with 3-stage pipeline, on-chip RTC with calendar function, and hardware support for SPI/I²C/UART serial interfaces.
Technical Context
The R5F121BCAFP#10 implements the RL78 CPU core with CISC architecture, 1 MB address space, and configurable instruction timing (0.0625 μs min @ 16 MHz high-speed oscillator or 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 functions.
Its analog subsystem includes an 8/10-bit A/D converter with up to 11 input channels, internal reference voltage (0.815 V), temperature sensor, and dual comparators. The capacitive touch sensing unit supports self-capacitance (15 keys) and mutual-capacitance (up to 16 keys in matrix) modes with dedicated TSCAP pin and noise-immune scanning logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | RL78 16-bit CISC with 3-stage pipeline, 1 MB address space |
| Flash Memory | 32 KB code flash (1 KB block size), 1 KB data flash (512 B block) |
| RAM | 2 KB on-chip RAM for variables and stack |
| Operating Voltage | 2.4 V to 5.5 V single supply - enables direct battery or industrial rail interfacing |
| Temperature Range | −40°C to +125°C (M-grade) - qualified for under-hood automotive and industrial motor control |
| A/D Converter | 8/10-bit resolution, 11-channel input, internal 0.815 V reference - eliminates external reference for cost-sensitive sensor nodes |
| Capacitive Touch | 15-channel CTSU with self/mutual capacitance modes - supports robust button/slider/knob UI without overlay sensors |
Pinout & Package
32-pin plastic LQFP (7.0 × 7.0 mm, 0.8-mm pitch), exposed pad not electrically connected; RoHS-compliant, moisture sensitivity level (MSL) 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also supports serial array unit (SAU) channel 0 output and clocked serial output |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | Primary UART receive input with analog input capability; supports SAU channel 0 input and serial data input |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Dedicated capacitive touch sensing input with internal voltage comparator output; also supports buzzer drive and analog input |
| P125 | RESET / INTP1 | Active-low reset input with interrupt capability; requires external pull-up for reliable power-on reset |
| VDD | Power Supply | Main 2.4–5.5 V supply for core and I/O; decoupling capacitor required at pin |
| VSS | GND | Digital ground reference; must be connected to PCB ground plane with low-inductance path |
Key Features
| Feature | Design Value |
|---|---|
| Low-Power HALT/STOP Modes | Reduces current consumption to sub-μA levels during sleep - extends battery life in portable HMIs |
| On-Chip High-Speed Oscillator | 16 MHz ±1.5% accuracy over −40°C to +125°C - eliminates external crystal for cost and board space savings |
| Background Data Flash Rewrite | Not supported - requires code flash execution suspension during data flash writes, simplifying firmware update logic |
| Real-Time Clock with Calendar | 99-year calendar, alarm, and clock correction - enables time-stamped logging and scheduled wake-up without external RTC |
| Peripheral I/O Redirection | PIOR registers allow dynamic remapping of serial, timer, and interrupt functions to alternate pins - increases PCB layout flexibility |
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 controller executing real-time control loops while managing capacitive touch buttons, display backlight PWM, and RS-485 communication. Use Value: Integrated CTSU and −40°C to +125°C operation eliminate external touch controllers and thermal derating concerns. | 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 handling touch decoding, appliance state machine, temperature sensing via ADC, and power metering via timer capture. Use Value: 32 KB flash accommodates bootloader, UI graphics, and safety-certified control firmware in a single chip. |
| Automotive Cabin Sensor Node | IoT Edge Sensor Gateway |
Use Scenario: Occupancy detection, ambient light, and cabin temperature monitoring in vehicle door modules or center consoles. IC Role / Device Role / Timing Role: Low-power sensor aggregator with CAN/LIN physical layer interface (via external transceiver) and local touch response. Use Value: M-grade temperature rating and built-in watchdog ensure reliability in unventilated cabin locations. | Use Scenario: Battery-powered environmental sensor node collecting temperature, humidity, and air quality data for cloud reporting. IC Role / Device Role / Timing Role: Sleep-wake coordinator using RTC alarm, ADC sampling engine, and UART-to-LoRaWAN bridge via external module. Use Value: HALT mode current of 61 μA/MHz at 125°C enables multi-year operation on coin-cell batteries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMFP#10 | Same 32 KB flash, 2 KB RAM, and LQFP-32 package but rated for −40°C to +125°C with HWQFN-5×5 mm (0.5 mm pitch) instead of LQFP | HWQFN offers smaller footprint and better thermal dissipation; requires different PCB land pattern and reflow profile | Select R5F121BCMFP#10 when board space is constrained and thermal performance is critical; verify solder paste volume for QFN exposed pad |
| R5F121BCGFP#10 | Identical electrical specs and LQFP-32 package but rated for −40°C to +105°C (G-grade) instead of +125°C (M-grade) | Lower max temperature limits use in under-hood or high-ambient industrial enclosures where >105°C operation is required | Select R5F121BCGFP#10 for cost-sensitive industrial applications within −40°C to +105°C range; no PCB change needed |
Compared with R5F121BCMFP#10 (HWQFN) and R5F121BCGFP#10 (G-grade LQFP), the R5F121BCAFP#10 provides the highest temperature margin in the standard LQFP package, enabling drop-in replacement in legacy designs requiring M-grade qualification without layout revision.
Availability
R5F121BCAFP#10 is available at Aetrix Electronics and suitable for industrial control panels, smart appliance interfaces, and automotive cabin sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BCAFP#10 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 with integrated capacitive touch and robust industrial temperature grading, targeting cost-sensitive HMI and sensor-edge applications.
FAQ
What is the maximum operating frequency of the R5F121BCAFP#10 CPU core?
The R5F121BCAFP#10 features an RL78 CPU core with a minimum instruction execution time of 0.0625 μs at 16 MHz using the high-speed on-chip oscillator. This corresponds to a maximum sustained operating frequency of 16 MHz under specified voltage (2.4–5.5 V) and temperature (−40°C to +125°C) conditions. The core supports dynamic clock switching to lower frequencies including 32.768 kHz for ultra-low-power RTC operation.
Does the R5F121BCAFP#10 support background data flash programming?
No, the R5F121BCAFP#10 does not support background operation (BGO) for data flash memory. During data flash rewrite operations, instruction execution from code flash memory is suspended. This requires firmware to manage critical sections carefully - for example, copying active code to RAM before initiating a write - and precludes concurrent execution and storage updates without architectural mitigation.
How many capacitive touch sensing channels does the R5F121BCAFP#10 provide?
The R5F121BCAFP#10 integrates a dedicated Capacitive Touch Sensing Unit (CTSU) supporting up to 15 channels in self-capacitance mode (one pin per key) or up to 16 keys in mutual-capacitance matrix configuration using selectable transmit/receive pins from the same 15-pin pool. All CTSU functionality is implemented in hardware with built-in noise cancellation and auto-calibration logic.
What serial communication interfaces are available on the R5F121BCAFP#10?
The R5F121BCAFP#10 provides three simplified SPI (CSI) channels, three UART channels, three simplified I²C (RIIC) channels, and one full I²C (IICA) channel. These interfaces are implemented in the Serial Array Unit (SAU) and can be flexibly assigned to multiple pins using the Peripheral I/O Redirection (PIOR) registers, enabling routing optimization without hardware changes.
Is the R5F121BCAFP#10 pin-compatible with other RL78/G16 variants in LQFP-32 packaging?
Yes, the R5F121BCAFP#10 shares identical pinout, electrical characteristics, and package dimensions (7.0 × 7.0 mm, 0.8-mm pitch LQFP-32) with all other RL78/G16 family members in the FP package variant, including R5F121BAAFP#10 (16 KB flash), R5F121BCGFP#10 (G-grade), and R5F121BAMFP#10 (M-grade with different marking). Firmware and PCB layouts are interchangeable across these variants.
R5F121BCAFP#10 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BCAFP#10 FAQ
1.How can I place an order for R5F121BCAFP#10 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCAFP#10 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 R5F121BCAFP#10 reliable?
The price and inventory of R5F121BCAFP#10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCAFP#10 is usually 5 days.
3.What payment methods are accepted for R5F121BCAFP#10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCAFP#10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCAFP#10?
R5F121BCAFP#10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCAFP#10 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 R5F121BCAFP#10?
For technical support, including R5F121BCAFP#10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCAFP#10 requirements.
6.How does Aetrix verify that R5F121BCAFP#10 is sourced from the original manufacturer or authorized distributors?
All R5F121BCAFP#10 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 R5F121BCAFP#10 meets industry standards.
7.What is the process for return or replacement of R5F121BCAFP#10?
All R5F121BCAFP#10 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCAFP#10, 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 R5F121BCAFP#10 part is unused and in its original packaging.
Return procedure for R5F121BCAFP#10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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