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Renesas R5F121BAMFP#70
- Part No.:
- R5F121BAMFP#70
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BAMFP#70.pdf
- Description:
- 16-BIT GENERAL MCU RL78/G16 16K
- Quantity:
- Payment:
- Shipping:
Inventory:4,900
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Product details
Overview
R5F121BAMFP#70 from Renesas Electronics is a 32-pin LQFP-packaged RL78/G16 16-bit microcontroller with 32 KB code flash, 2 KB RAM, and industrial-grade operation up to +125°C. It integrates an 8/10-bit ADC (11-channel), capacitive touch sensing unit (15-channel), real-time clock with calendar, and multiple serial interfaces including UART, simplified SPI (CSI), simplified I²C, and full I²C - deployed in smart home control panels requiring low-power, touch-enabled HMI.
For engineers reviewing the R5F121BAMFP#70 datasheet, R5F121BAMFP#70 pinout, R5F121BAMFP#70 application, or R5F121BAMFP#70 equivalent, key selection criteria include its M-grade temperature rating (−40°C to +125°C), 32-pin LQFP-0.8mm package, integrated CTSU for self/mutual capacitance touch, and dual serial array units supporting concurrent communication on multiple protocols without CPU intervention.
Technical Context
The R5F121BAMFP#70 implements the RL78 CPU core with a 3-stage pipeline CISC architecture, enabling configurable 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 on-chip RAM.
Peripheral integration centers on deterministic real-time control: eight 16-bit timers, one 12-bit interval timer, watchdog timer with dedicated low-speed oscillator, and a 99-year RTC with alarm and correction functions. The CTSU supports both self-capacitance (15 keys) and mutual-capacitance (up to 16 keys in matrix) modes, with hardware-accelerated scanning independent of CPU load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | RL78 16-bit CISC with 3-stage pipeline; enables deterministic timing for real-time control loops. |
| Operating Voltage | 2.4 V to 5.5 V single supply; supports direct battery operation (e.g., 3.7 V Li-ion) without external regulators. |
| Flash Memory | 32 KB code flash (1 KB erase blocks); sufficient for bootloader + application firmware with field-upgrade capability. |
| RAM | 2 KB on-chip RAM; accommodates stack, heap, and real-time data buffers for sensor fusion or UI state management. |
| ADC Resolution | 8/10-bit SAR ADC with 11 analog inputs; supports simultaneous sampling of voltage, temperature, and touch reference signals. |
| CTSU Channels | 15-channel capacitive touch sensing unit; enables robust, noise-immune touch buttons/sliders without external ICs. |
| Temperature Range | −40°C to +125°C (M-grade); qualified for under-hood automotive modules and industrial motor drives. |
| Package | 32-pin LQFP (7.0 × 7.0 mm, 0.8 mm pitch); compatible with standard reflow processes and manual inspection. |
Pinout & Package
32-pin LQFP (7.0 × 7.0 mm, 0.8 mm pitch), exposed pad not electrically connected; requires thermal pad soldering for thermal dissipation in continuous +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also serves as serial array output for synchronous communication. |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | Analog input channel 0 and primary UART receive; enables combined debug interface and sensor signal acquisition. |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sense pin with internal voltage reference; directly connects to touch electrode without external components. |
| P125 | RESET / INTP1 | Active-low reset input with internal pull-up; doubles as external interrupt 1 for wake-from-STOP mode triggering. |
| VDD | Power Supply | Main 2.4–5.5 V supply; powers all digital and analog blocks; decoupling required per Renesas layout guidelines. |
| VSS | GND | Digital ground reference; separate analog ground not required due to integrated noise-suppression design. |
| P41 | RTC1HZ / TS13 / TI03 / TO03 | Real-time clock 1 Hz output and touch scan channel 13; enables low-power periodic wakeups and synchronized touch polling. |
| P60 | SCLA0 / INTP3 / INTP6 | I²C clock line with dual interrupt capability; supports shared bus arbitration and fast-mode (400 kHz) operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power STOP/HALT modes | Reduces current to sub-μA levels while retaining RAM and register states - critical for battery-powered remote controls. |
| On-chip high-speed oscillator (16 MHz ±1.5%) | Eliminates external crystal for cost-sensitive designs; meets timing requirements for UART at 115.2 kbps without calibration. |
| Background data flash rewriting disabled | Ensures deterministic interrupt latency by preventing flash write conflicts during real-time ISR execution. |
| Hardware-accelerated CTSU | Performs touch scan, noise cancellation, and baseline tracking autonomously - frees CPU for application logic. |
| Dual serial array units (SAU) | Enables concurrent UART + CSI + I²C operation without software bit-banging or DMA overhead. |
| Integrated BCD correction circuit | Accelerates decimal arithmetic for display drivers and numeric UI rendering without CPU cycles. |
Applications
| Smart Thermostat Interface | Industrial Motor Control Panel |
|---|---|
|
Use Scenario: Touch-based HVAC control panel with ambient temperature, humidity, and setpoint display. IC Role / Device Role / Timing Role: Main system controller executing UI logic, sensor polling, and relay actuation; RTC provides accurate scheduling. Use Value: Integrated CTSU eliminates external touch controller; 11-channel ADC reads thermistor, humidity sensor, and voltage rails in one scan cycle. |
Use Scenario: Local HMI for variable-frequency drive with status LEDs, fault indicators, and parameter adjustment. IC Role / Device Role / Timing Role: Dedicated HMI processor handling button debouncing, LED PWM, and serial communication with main drive MCU. Use Value: Dual SAU units simultaneously manage Modbus RTU (UART) and local I²C display interface without CPU contention. |
| Automotive Cabin Control Module | White Goods Appliance Control Board |
|
Use Scenario: Dashboard-mounted seat heater/ventilation control with capacitive sliders and LED feedback. IC Role / Device Role / Timing Role: Touch and LED controller operating in extended temperature range; STOP mode enables <1 μA sleep current. Use Value: M-grade −40°C to +125°C rating ensures reliability near vehicle HVAC ducts; CTSU immunity to ESD per ISO 10605. |
Use Scenario: Front-panel controller for washing machine with water-level sensing, door lock monitoring, and cycle progress display. IC Role / Device Role / Timing Role: System supervisor managing safety interlocks, analog sensor inputs, and buzzer alerts via PCLBUZ0. Use Value: On-chip comparator monitors door lock voltage thresholds; 16-bit timers generate precise buzzer tones and LED dimming waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMFP | Same package and pinout; G-grade (−40°C to +105°C) instead of M-grade; identical peripherals and memory. | Suitable for industrial equipment not requiring +125°C operation; lower qualification cost. | Select when ambient temperature stays below +105°C and cost optimization is prioritized over extended thermal margin. |
| R5F121BCAFP | Same 32 KB flash, 2 KB RAM, and LQFP package; A-grade (−40°C to +85°C); lacks M-grade qualification testing. | Targeted at consumer appliances with controlled environments; not rated for under-hood or high-heat industrial zones. | Choose only for cost-sensitive consumer products where full M-grade thermal validation is unnecessary. |
Compared with R5F121BCMFP and R5F121BCAFP, the R5F121BAMFP#70 uniquely delivers guaranteed operation at +125°C with full industrial qualification, making it the sole option for automotive cabin modules and high-temperature motor control enclosures where thermal derating is unacceptable.
Availability
R5F121BAMFP#70 is available at Aetrix Electronics and suitable for smart thermostat interfaces, industrial motor control panels, and automotive cabin control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BAMFP#70 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 management solutions for automotive, industrial, and IoT markets.
The RL78/G16 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, touch-enabled human-machine interfaces in harsh thermal environments - targeting appliance, building automation, and automotive body electronics.
FAQ
What is the maximum operating temperature specification for the R5F121BAMFP#70?
The R5F121BAMFP#70 is rated for operation from −40°C to +125°C (M-grade), validated per industrial qualification standards. This specification applies to all peripherals including the CTSU, ADC, and serial interfaces, ensuring reliable performance in under-hood automotive or high-temperature industrial enclosures where ambient heat exceeds +105°C.
Does the R5F121BAMFP#70 support hardware-accelerated capacitive touch sensing?
Yes, the R5F121BAMFP#70 integrates a dedicated Capacitive Touch Sensing Unit (CTSU) with 15 channels supporting both self-capacitance (15 keys) and mutual-capacitance (up to 16 keys in matrix) modes. The CTSU operates autonomously with hardware noise cancellation and baseline tracking, eliminating CPU overhead during touch scanning.
Can the R5F121BAMFP#70 execute code while rewriting data flash memory?
No, the R5F121BAMFP#70 does not support background operation (BGO) for data flash writes. Instructions cannot be executed from code flash memory during data flash rewriting, requiring careful scheduling of firmware updates outside real-time critical sections to avoid interrupt latency violations.
What serial communication interfaces are available on the R5F121BAMFP#70?
The R5F121BAMFP#70 provides three simplified SPI (CSI) channels, three UART channels, three simplified I²C channels, and one full I²C channel via its dual Serial Array Units (SAUs). All interfaces operate concurrently without CPU intervention, enabling simultaneous communication with displays, sensors, and host controllers.
Is an external crystal required for the R5F121BAMFP#70 to achieve accurate UART timing?
No, the R5F121BAMFP#70 includes a factory-trimmed high-speed on-chip oscillator with ±1.5% accuracy across −40°C to +125°C, sufficient for UART operation at standard baud rates (e.g., 115.2 kbps) without external crystals - reducing BOM cost and PCB area.
R5F121BAMFP#70 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:
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BAMFP#70 FAQ
1.How can I place an order for R5F121BAMFP#70 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAMFP#70 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 R5F121BAMFP#70 reliable?
The price and inventory of R5F121BAMFP#70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAMFP#70 is usually 5 days.
3.What payment methods are accepted for R5F121BAMFP#70?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAMFP#70 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAMFP#70?
R5F121BAMFP#70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAMFP#70 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 R5F121BAMFP#70?
For technical support, including R5F121BAMFP#70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAMFP#70 requirements.
6.How does Aetrix verify that R5F121BAMFP#70 is sourced from the original manufacturer or authorized distributors?
All R5F121BAMFP#70 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 R5F121BAMFP#70 meets industry standards.
7.What is the process for return or replacement of R5F121BAMFP#70?
All R5F121BAMFP#70 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAMFP#70, 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 R5F121BAMFP#70 part is unused and in its original packaging.
Return procedure for R5F121BAMFP#70:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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