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Renesas R5F121BAANA#40
- Part No.:
- R5F121BAANA#40
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
R5F121BAANA#40.pdf
- Description:
- 16BIT MCU RL78/G16 16K 32HWQFN -
- Quantity:
- Payment:
- Shipping:
Inventory:2,580
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Product details
Overview
R5F121BAANA#40 from Renesas Electronics is a 32-pin HWQFN-packaged 16-bit RL78/G16 microcontroller with 16 KB code flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU). It operates from 2.4–5.5 V, supports ultra-low-power STOP/HALT modes, and delivers real-time clock, 16-bit timers (8 channels), 10-bit A/D converter (11-channel), and multiple serial interfaces including UART, simplified SPI (CSI), and I²C for embedded control in space-constrained industrial applications.
For engineers reviewing the R5F121BAANA#40 datasheet, R5F121BAANA#40 pinout, R5F121BAANA#40 application, or R5F121BAANA#40 equivalent, this page provides verified technical context, package-specific pin mapping, functional alternatives, and supply-chain support tailored to industrial-grade MCU selection - especially where low-power operation, touch interface integration, and extended temperature range (−40°C to +125°C) are critical.
Technical Context
The R5F121BAANA#40 implements the RL78 CPU core with a 3-stage pipeline 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 16 KB code flash (1 KB block erase), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB on-chip RAM.
Peripheral integration centers on system-level responsiveness and HMI enablement: it features a 15-channel capacitive touch sensing unit (CTSU) with self- and mutual-capacitance support, dual voltage comparators, RTC with 99-year calendar and alarm, and up to 3 UART/CSI/I²C channels - all operating within −40°C to +125°C (M-grade industrial specification).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | RL78 16-bit CISC with 3-stage pipeline; enables deterministic timing and low interrupt latency for real-time control loops. |
| Operating Voltage | 2.4 V to 5.5 V single supply; supports direct battery operation (e.g., 3.0 V Li-ion or 4.5–5.5 V industrial rails) without external regulators. |
| Flash Memory | 16 KB code flash (1 KB erase blocks); sufficient for firmware with bootloader, communication stacks, and sensor processing logic. |
| Data Flash | 1 KB data flash (512 B blocks, 32-bit rewrite units, 1M TYP. rewrites); stores calibration data, device configuration, or usage logs non-volatilely. |
| Capacitive Touch | 15-channel CTSU supporting self-capacitance (15 keys) or mutual-capacitance matrix (up to 16 keys); eliminates mechanical buttons in HMI designs. |
| Temperature Range | −40°C to +125°C (M-grade); qualified for under-hood automotive modules, motor drives, and industrial power converters. |
| Package | 32-pin HWQFN (5.0 × 5.0 mm, 0.5 mm pitch) with exposed die pad; enables compact PCB layout and efficient thermal dissipation in sealed enclosures. |
Pinout & Package
32-pin HWQFN (5.0 × 5.0 mm, 0.5 mm pitch) with exposed die pad - requires soldering of the pad to a thermally conductive, electrically isolated copper area on the PCB per Renesas design guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also serves as serial array output and tool interface for programming/debugging. |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | UART receive input with analog channel 0; dual-role pin enables debug communication and sensor signal acquisition. |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sense input (TSCAP) with analog channel 1 and buzzer output; central to touch-key implementation. |
| P125 | RESET / INTP1 / VCOUT0 / INTP0 | Active-low reset input with interrupt capability; supports both hardware reset assertion and wake-up-from-STOP via external event. |
| VDD | Power Supply | Main 2.4–5.5 V supply rail; powers core, peripherals, and I/O; decoupling required per datasheet layout rules. |
| VSS | GND | Digital ground reference; must be connected to low-impedance ground plane, separate from analog ground if mixed-signal layout used. |
| P41 | RTC1HZ / TS13 / TI03 / TO03 | Real-time clock 1 Hz output with touch channel 13 and timer I/O; enables precise timekeeping and synchronized touch scanning. |
| P60 | SCLA0 / INTP3 / INTP6 / SI11 | I²C clock line with interrupt inputs and serial array input; supports multi-master I²C bus and flexible peripheral interrupt routing. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power STOP mode | Reduces current consumption to microampere levels while retaining RAM and register state - ideal for battery-powered remote sensors. |
| On-chip high-speed oscillator | 16 MHz ±1.5% accuracy over −40°C to +125°C; eliminates external crystal cost and board space for timing-critical but non-precision applications. |
| Integrated CTSU | 15-channel capacitive touch sensing with built-in noise rejection and auto-calibration - enables robust touch UI without external IC or firmware overhead. |
| 10-bit A/D converter | 11 analog inputs with internal reference (0.815 V) and temperature sensor; supports direct monitoring of battery voltage, thermistors, and analog sensors. |
| Multiple serial interfaces | Up to 3 UART/CSI/I²C channels with flexible pin remapping via PIOR registers - simplifies PCB routing and enables concurrent communication with displays, sensors, and host controllers. |
| Industrial temperature grade | M-grade qualification (−40°C to +125°C) with full functionality across range - ensures reliability in motor control, power supplies, and factory automation equipment. |
Applications
| Industrial Motor Control | Smart Appliance HMI |
|---|---|
|
Use Scenario: Compact BLDC motor driver with speed regulation, fault detection, and local user interface. IC Role / Device Role / Timing Role: Main system controller executing FOC algorithms, managing gate drivers, reading hall sensors, and driving capacitive touch panel. Use Value: Integrated CTSU and 11-channel A/D eliminate external touch controller and ADC; 16-bit timers enable precise PWM generation for motor phases. |
Use Scenario: Oven, washing machine, or HVAC front-panel with touch keys, display backlight control, and temperature monitoring. IC Role / Device Role / Timing Role: Dedicated HMI processor handling touch scan, LED/buzzer feedback, serial display updates, and analog thermistor readings. Use Value: Self-capacitance CTSU supports 15 independent touch keys; RTC with alarm enables cooking timers; M-grade temp range ensures operation near heating elements. |
| Energy Metering Interface | Industrial Sensor Node |
|
Use Scenario: DIN-rail mounted energy monitor collecting voltage/current via shunt or CT, communicating via UART/RS-485. IC Role / Device Role / Timing Role: Data acquisition and protocol translation unit - reads analog inputs, computes RMS values, formats Modbus frames. Use Value: 10-bit A/D with internal reference ensures stable measurements across temperature; STOP mode extends battery life in portable versions. |
Use Scenario: Wireless vibration/temperature node in predictive maintenance systems, operating in harsh factory environments. IC Role / Device Role / Timing Role: Edge-processing MCU acquiring analog sensor data, performing FFT preprocessing, and managing low-power radio sleep/wake cycles. Use Value: −40°C to +125°C rating guarantees operation near motors/gearboxes; 2 KB RAM accommodates sensor buffers and lightweight ML inference kernels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCANA#40 | 32 KB code flash (vs. 16 KB), same package, peripherals, and temperature grade. | Required when firmware exceeds 16 KB - e.g., adding OTA update stack, cryptographic libraries, or multi-protocol wireless coexistence. | Select R5F121BCANA#40 only if code size headroom is insufficient; identical pinout and layout allow drop-in upgrade with firmware rebuild. |
| RA2A1M2ACFP#AA0 | Arm® Cortex®-M23 core, 256 KB flash, 32 KB SRAM, 12-bit A/D, 24-channel CTSU; LQFP-64 package. | Higher performance, larger memory, and enhanced security (TrustZone); suited for next-gen designs requiring scalability or secure boot. | Choose RA2A1M2ACFP#AA0 for new designs needing future-proofing, higher throughput, or security certification - not a pin-compatible replacement. |
Compared with R5F121BCANA#40, the R5F121BAANA#40 trades flash capacity for lower cost and smaller footprint in resource-constrained applications; versus RA2A1M2ACFP#AA0, it offers proven RL78 ecosystem compatibility and lower power at the expense of architectural modernization and security features.
Availability
R5F121BAANA#40 is available at Aetrix Electronics and suitable for industrial motor control, smart appliance HMI, energy metering interfaces, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BAANA#40 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 Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.
The RL78/G16 product line targets cost-sensitive, ultra-low-power embedded applications requiring integrated analog peripherals, capacitive touch, and industrial-grade reliability - particularly in white goods, factory automation, and building controls.
FAQ
What is the maximum operating frequency and clock source options for the R5F121BAANA#40?
The R5F121BAANA#40 supports a maximum core frequency of 16 MHz using its on-chip high-speed oscillator, selectable at 16/8/4/2/1 MHz with ±1.5% accuracy over −40°C to +125°C. External crystal (X1/X2) or ceramic resonator (XT1/XT2) can also drive the main clock, enabling precision timing for communication or RTC synchronization. The subsystem clock runs at 32.768 kHz for ultra-low-power operation.
Does the R5F121BAANA#40 support in-system programming and debugging?
Yes, the R5F121BAANA#40 includes an on-chip debug function compatible with Renesas E2 studio and E2 emulator. It supports full-speed debugging, flash programming via TOOL0/TOOLRxD/TOOLTxD pins, and background data flash rewriting (though BGO is not supported - code execution halts during data flash write operations).
How many capacitive touch channels does the R5F121BAANA#40 support, and what configurations are possible?
The R5F121BAANA#40 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). Both modes include built-in noise cancellation and auto-calibration features.
What is the data flash endurance and rewrite unit size for the R5F121BAANA#40?
The R5F121BAANA#40 provides 1 KB of data flash organized in two 512-byte blocks. Each rewrite operation targets a 32-bit unit, and the datasheet specifies a typical endurance of 1,000,000 rewrites per block at VDD = 2.4–5.5 V. Rewrites require prior erasure and cannot occur concurrently with code flash execution.
Is the R5F121BAANA#40 pin-compatible with other RL78/G16 variants in the same package?
Yes, the R5F121BAANA#40 is fully pin-compatible with all other 32-pin HWQFN RL78/G16 devices (e.g., R5F121BCANA#40, R5F121BAMNA#40), sharing identical pin count, pitch, and multiplexed function mapping. Differences are limited to flash size, temperature grade, and ordering suffix - enabling seamless migration within the same PCB layout.
R5F121BAANA#40 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-WFQFN Exposed Pad
- 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:
- 16KB (16K 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:
R5F121BAANA#40 FAQ
1.How can I place an order for R5F121BAANA#40 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAANA#40 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 R5F121BAANA#40 reliable?
The price and inventory of R5F121BAANA#40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAANA#40 is usually 5 days.
3.What payment methods are accepted for R5F121BAANA#40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAANA#40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAANA#40?
R5F121BAANA#40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAANA#40 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 R5F121BAANA#40?
For technical support, including R5F121BAANA#40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAANA#40 requirements.
6.How does Aetrix verify that R5F121BAANA#40 is sourced from the original manufacturer or authorized distributors?
All R5F121BAANA#40 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 R5F121BAANA#40 meets industry standards.
7.What is the process for return or replacement of R5F121BAANA#40?
All R5F121BAANA#40 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAANA#40, 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 R5F121BAANA#40 part is unused and in its original packaging.
Return procedure for R5F121BAANA#40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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