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Renesas R5F121BCANA#20
- Part No.:
- R5F121BCANA#20
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
R5F121BCANA#20.pdf
- Description:
- MCU:RL78
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
R5F121BCANA#20 from Renesas Electronics is a 32-pin, 32 KB flash, 2 KB RAM RL78/G16 16-bit microcontroller in HWQFN-32 (5 × 5 mm, 0.5-mm pitch) package, operating from 2.4–5.5 V with industrial-grade temperature range (−40°C to +125°C). It integrates capacitive touch sensing (15-channel CTSU), 10-bit A/D converter (11 channels), real-time clock with calendar, and dual serial interfaces including I²C and simplified SPI.
For engineers reviewing the R5F121BCANA#20 datasheet, R5F121BCANA#20 pinout, R5F121BCANA#20 application, or R5F121BCANA#20 equivalent, key selection criteria include its M-grade extended temperature support, on-chip debug capability, self-programmable flash architecture, and integrated touch sensing for space-constrained industrial HMI designs.
Technical Context
The R5F121BCANA#20 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting variable instruction execution time from 0.0625 μs (@16 MHz high-speed oscillator) to 30.5 μs (@32.768 kHz subsystem clock). Its memory subsystem includes 32 KB code flash (1 KB block erase), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB SRAM.
Peripheral integration includes eight 16-bit timers, one 12-bit interval timer, watchdog timer, RTC with alarm and correction, up to three UART/SPI/I²C-compatible serial channels, two comparators, and a dedicated capacitive touch sensing unit (CTSU) supporting both self- and mutual-capacitance configurations across 15 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | RL78 16-bit CISC CPU with 3-stage pipeline and 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/erase cycles at VDD = 2.4–5.5 V |
| Operating Voltage | 2.4 V to 5.5 V single supply; enables direct interface with 3.3 V and 5 V systems |
| Temperature Range | −40°C to +125°C (M-grade industrial qualification) |
| Capacitive Touch | 15-channel CTSU supporting self-capacitance (15 keys) or mutual-capacitance (up to 16 keys) |
| A/D Converter | 10-bit resolution, 11 analog input channels, internal reference (0.815 V), temp sensor, and touch voltage selection |
Pinout & Package
Package: HWQFN-32 (5.0 × 5.0 mm, 0.5-mm pitch) with exposed die pad requiring non-electrical PCB thermal pad connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P125 | RESET/INTP1/VCOUT0/INTP0 | Active-low reset input with internal SPOR; also serves as external interrupt 1 and voltage output channel 0 |
| P00 | TOOLTxD/INTP6/SO00/TxD0/RTC1HZ | UART0 transmit output; also supports tool interface, interrupt 6, SPI0 shift-out, and RTC 1 Hz output |
| P01 | TOOLRxD/ANI0/INTP5/TS00/TI02/TO02/SI00/RxD0/SDA00 | UART0 receive input with analog channel 0, touch sense 0, timer I/O, and I²C/UART/SPI multiplexing |
| P02 | PCLBUZ0/ANI1/VCOUT0/INTP7/TSCAP/TI01/TO01/SCK00/SCL00 | Capacitive touch sensing input (TSCAP); also buzzer control, analog input 1, voltage output 0, and SPI0 clock |
| P41 | RTC1HZ/TS13/TI03/TO03/SCK20/SCL20/VCOUT0/VCOUT1 | RTC 1 Hz output with touch sense 13, timer I/O, SPI2 clock, and dual voltage outputs for analog biasing |
| VDD | Power Supply | Main 2.4–5.5 V supply for core and I/O; decoupling required per QFN layout guidelines |
| VSS | Ground | Digital ground reference; must be connected to PCB ground plane under exposed die pad |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power HALT/STOP modes | Enables battery-powered operation with sub-μA standby current; STOP mode retains RAM and register state |
| High-speed on-chip oscillator | Factory-trimmed 16 MHz option with ±1.5% accuracy over −40°C to +125°C, eliminating external crystal cost |
| On-chip debug interface | Full ICE functionality via TOOL0/TOOLRxD/TOOLTxD pins; no external debugger hardware required for development |
| Background data flash writes | Not supported - but 1M-cycle endurance and 32-bit rewrite granularity enable robust firmware update logging |
| Capacitive touch sensing unit (CTSU) | Hardware-accelerated touch detection with noise immunity; eliminates need for external touch controller IC |
Applications
| Industrial Control Panel | Smart Thermostat |
|---|---|
|
Use Scenario: Front-panel HMI with push-button and slider controls in factory automation enclosures. IC Role / Device Role / Timing Role: Main system MCU executing control logic, managing capacitive touch inputs, and driving local displays via SPI. Use Value: Integrated CTSU and M-grade temperature rating eliminate external touch IC and enable reliable operation in uncontrolled ambient environments. |
Use Scenario: Battery-powered HVAC thermostat with temperature sensing, display, and wireless communication interface. IC Role / Device Role / Timing Role: System controller handling ADC-based temperature acquisition, RTC-based scheduling, and low-power sleep/wake cycles. Use Value: 61-μA/MHz active current and STOP mode reduce average power consumption, extending coin-cell battery life beyond 2 years. |
| Programmable Power Supply | Industrial Sensor Node |
|
Use Scenario: Digitally adjustable bench power supply with voltage/current setpoint knobs and OLED display. IC Role / Device Role / Timing Role: Precision control MCU managing DAC outputs, monitoring feedback ADCs, and interpreting encoder inputs. Use Value: 10-bit ADC with internal reference and comparator support enables accurate closed-loop regulation without external precision references. |
Use Scenario: DIN-rail mounted vibration/temperature sensor node transmitting data via RS-485 or CAN interface. IC Role / Device Role / Timing Role: Edge-processing MCU acquiring analog sensor signals, performing basic FFT preprocessing, and managing serial communication. Use Value: Dual serial interfaces (UART + simplified SPI/I²C) allow simultaneous sensor interfacing and industrial bus communication without external bridge ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMNA#20 | Same package and pinout; identical specs except rated for −40°C to +125°C (M-grade) with same flash/RAM | No functional difference; identical use cases and qualification level | Select R5F121BCMNA#20 if full M-grade documentation traceability is required for automotive-adjacent industrial programs |
| R5F121BCGNA#20 | Same package and pinout; rated for −40°C to +105°C (G-grade) with identical peripherals and memory | Suitable for less thermally demanding industrial environments; lower qualification cost | Choose R5F121BCGNA#20 when operating ambient stays below +105°C and cost optimization is prioritized |
Compared with R5F121BCANA#20, the R5F121BCMNA#20 offers identical electrical and functional behavior with full M-grade certification, while R5F121BCGNA#20 provides G-grade qualification at reduced cost-both retain the same 32 KB flash, CTSU, and serial interface capabilities without layout changes.
Availability
R5F121BCANA#20 is available at Aetrix Electronics and suitable for industrial control panels, smart thermostats, programmable power supplies, and sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BCANA#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, 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 industrial HMI and sensor-edge applications with integrated touch and precision analog.
FAQ
What is the maximum operating frequency of the R5F121BCANA#20?
The R5F121BCANA#20 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 clock sources including the 32.768 kHz subsystem oscillator for ultra-low-power RTC and standby operation.
Does the R5F121BCANA#20 support in-system programming without external hardware?
Yes, the R5F121BCANA#20 supports on-chip debug and self-programming via its built-in TOOL interface (TOOLTxD/TOOLRxD/TOOL0 pins). No external programmer is needed for firmware updates during development or field deployment, though background operation during data flash writes is not supported.
What touch sensing methods does the R5F121BCANA#20's CTSU support?
The R5F121BCANA#20's capacitive touch sensing unit (CTSU) supports both self-capacitance (single-pin per key, up to 15 keys) and mutual-capacitance (matrix configuration using transmit/receive pin pairs, up to 16 keys). Both modes operate with hardware acceleration and built-in noise suppression.
Is the R5F121BCANA#20 pin-compatible with other RL78/G16 variants in HWQFN-32?
Yes, all RL78/G16 devices in the HWQFN-32 package-including R5F121BCANA#20, R5F121BCMNA#20, and R5F121BCGNA#20-share identical pinouts and mechanical footprint. Firmware and PCB design are interchangeable across these variants; only temperature grade and ordering part number differ.
What are the data flash endurance and voltage requirements for the R5F121BCANA#20?
The R5F121BCANA#20 features 1 KB of data flash rated for 1,000,000 write/erase cycles at VDD = 2.4–5.5 V. Each rewrite operates on 32-bit units, and erasure occurs in 512-byte blocks. No external voltage booster is required-full functionality is guaranteed across the entire supply range.
R5F121BCANA#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:
- 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:
R5F121BCANA#20 FAQ
1.How can I place an order for R5F121BCANA#20 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCANA#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 R5F121BCANA#20 reliable?
The price and inventory of R5F121BCANA#20 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCANA#20 is usually 5 days.
3.What payment methods are accepted for R5F121BCANA#20?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCANA#20 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCANA#20?
R5F121BCANA#20 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCANA#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 R5F121BCANA#20?
For technical support, including R5F121BCANA#20 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCANA#20 requirements.
6.How does Aetrix verify that R5F121BCANA#20 is sourced from the original manufacturer or authorized distributors?
All R5F121BCANA#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 R5F121BCANA#20 meets industry standards.
7.What is the process for return or replacement of R5F121BCANA#20?
All R5F121BCANA#20 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCANA#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 R5F121BCANA#20 part is unused and in its original packaging.
Return procedure for R5F121BCANA#20:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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