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Renesas R5F121BAMFP#50
- Part No.:
- R5F121BAMFP#50
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BAMFP#50.pdf
- Description:
- 16BIT MCU RL78/G16 16K 32LQFP -4
- Quantity:
- Payment:
- Shipping:
Inventory:1,771
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Product details
Overview
R5F121BAMFP#50 from Renesas Electronics is a 32-pin LQFP-packaged RL78/G16 16-bit microcontroller with 32 KB code flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU), designed for industrial control panels, appliance HMI interfaces, and battery-powered sensor nodes operating from −40°C to +125°C.
For engineers reviewing the R5F121BAMFP#50 datasheet, R5F121BAMFP#50 pinout, R5F121BAMFP#50 application, or R5F121BAMFP#50 equivalent, this page delivers verified electrical specs, validated package mapping, confirmed peripheral configurations, and real-world design context for rapid integration into high-reliability embedded systems.
Technical Context
The R5F121BAMFP#50 implements the RL78 CPU core with a 3-stage pipeline, supporting instruction execution times from 0.0625 μs (@16 MHz) to 30.5 μs (@32.768 kHz), enabling dynamic power/performance scaling across HALT and STOP low-power modes. Its memory subsystem includes 32 KB code flash (1 KB blocks), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB on-chip RAM.
Peripherals include dual 16-bit timer arrays (8 channels total), 12-bit interval timer, watchdog timer, RTC with 99-year calendar, 10-bit A/D converter (11 analog inputs), 2-channel comparator, simplified SPI/I²C/UART interfaces (up to 3 channels each), and a dedicated capacitive touch sensing unit supporting self- and mutual-capacitance configurations.
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 erase blocks); 1 KB data flash (512 B blocks, 1M rewrites) |
| RAM | 2 KB on-chip SRAM for runtime variables and stack |
| Operating Voltage | 2.4 V to 5.5 V single supply - enables direct battery or unregulated rail operation |
| Temperature Range | −40°C to +125°C (M-grade industrial qualification) |
| A/D Converter | 10-bit resolution, 11-channel input, internal reference (0.815 V) and temperature sensor |
| Capacitive Touch | 15-channel CTSU supporting self-capacitance (15 keys) or mutual-capacitance matrix (up to 16 keys) |
Pinout & Package
32-pin plastic LQFP (7.0 × 7.0 mm, 0.8-mm pitch), exposed pad not electrically connected; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also supports serial array clock output and IICA SCLA0 |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | UART receive input with analog channel 0; supports serial array data input and IICA SDA00 |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sense input (TSCAP) with analog channel 1 and buzzer output capability |
| P125 | RESET / INTP1 | Active-low reset input with interrupt capability; requires external pull-up for reliable startup |
| VDD | Power Supply | Main 2.4–5.5 V supply for core and I/O; decoupling required per datasheet layout guidelines |
| VSS | Ground | Digital ground reference; must be connected to low-impedance PCB plane |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | Halt mode current ≤ 0.55 μA; STOP mode current ≤ 0.23 μA at 32.768 kHz - extends battery life in always-on sensors |
| On-chip debug | Full on-chip debug functionality without boot swap; enables in-system programming and real-time trace |
| Self-programming | Code/data flash rewriting via application firmware - eliminates need for external programmer in field updates |
| High-speed oscillator | 16 MHz on-chip oscillator with ±1.5% accuracy over −40°C to +125°C - reduces BOM by eliminating external crystal |
| RTC with calendar | 99-year calendar, alarm, and clock correction - supports time-stamped logging and scheduled wake-up |
Applications
| Industrial HMI Panels | Smart Appliance Controls |
|---|---|
|
Use Scenario: Touch-enabled control interface for HVAC systems, PLC operator terminals, and motor drives requiring robust operation at 125°C ambient. IC Role / Device Role / Timing Role: Main system controller executing real-time logic, managing capacitive touch input, driving LED indicators, and communicating via UART to host MCU. Use Value: Integrated CTSU eliminates external touch controller IC; M-grade temperature rating ensures reliability in enclosed enclosures near heat sources. |
Use Scenario: User interface and sensor management in washing machines, refrigerators, and dishwashers with sealed front panels and variable load conditions. IC Role / Device Role / Timing Role: Dedicated HMI processor handling touch detection, buzzer feedback, temperature monitoring (via on-chip sensor), and relay control sequencing. Use Value: 10-bit A/D with internal reference enables accurate thermistor reading; 32 KB flash accommodates multi-language UI assets and firmware updates. |
| Battery-Powered Sensors | Energy Monitoring Modules |
|
Use Scenario: Wireless environmental sensor node (temperature/humidity/motion) powered by coin cell or energy harvesting, transmitting data via UART-to-LoRa bridge. IC Role / Device Role / Timing Role: Low-power system manager sampling analog sensors, processing touch wake events, and entering STOP mode between transmissions. Use Value: Sub-1 μA STOP current and fast wake-up (<10 μs) minimize average power; integrated RTC enables precise duty-cycled sampling. |
Use Scenario: DIN-rail mounted electricity meter add-on module measuring voltage/current harmonics and reporting via RS-485. IC Role / Device Role / Timing Role: Peripheral coordinator interfacing with external ADCs, managing isolation barriers, and timestamping measurements using hardware RTC. Use Value: Dual serial interfaces (UART + I²C) enable concurrent communication with metrology ASIC and isolated transceiver; 11-channel A/D supports auxiliary sensor inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMFP#50 | Same package and pinout; G-grade (−40°C to +105°C) instead of M-grade | Lower max ambient temperature rating; suitable for non-enclosed industrial environments | Select when full +125°C operation is unnecessary and cost optimization is prioritized |
| R5F121BCAFP#50 | Same 32 KB flash/RAM; A-grade (−40°C to +85°C) in same LQFP package | Consumer-temperature range only; lacks M-grade thermal validation and screening | Use only in indoor, climate-controlled applications where extended temperature is not required |
Compared with R5F121BAMFP#50, the G-grade R5F121BCMFP#50 offers identical functionality at lower thermal margin, while the A-grade R5F121BCAFP#50 sacrifices industrial qualification for cost reduction - neither provides drop-in replacement for M-grade thermal requirements.
Availability
R5F121BAMFP#50 is available at Aetrix Electronics and suitable for industrial HMI panels, smart appliance controls, and battery-powered sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BAMFP#50 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 with integrated capacitive touch and industrial-grade reliability - engineered for cost-sensitive, thermally demanding embedded control applications.
FAQ
What is the maximum operating temperature specification for the R5F121BAMFP#50?
The R5F121BAMFP#50 is rated for operation from −40°C to +125°C (M-grade industrial qualification), validated per Renesas' extended temperature screening standards. This allows deployment in high-ambient environments such as motor drive enclosures, under-hood automotive modules, and sealed industrial cabinets where thermal dissipation is constrained.
Does the R5F121BAMFP#50 support in-system programming of its flash memory?
Yes, the R5F121BAMFP#50 supports full in-system programming of both code flash and data flash via its on-chip debug interface. Self-programming is implemented without boot swap functionality, enabling firmware updates directly from application code - critical for remote device maintenance and field upgrades of the R5F121BAMFP#50.
How many capacitive touch channels does the R5F121BAMFP#50 provide, and what configurations are supported?
The R5F121BAMFP#50 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 selection from 15 pins, supporting up to 16 keys). Both modes operate independently of CPU loading via hardware acceleration.
What serial communication interfaces are available on the R5F121BAMFP#50?
The R5F121BAMFP#50 provides up to three simplified SPI (CSI) channels, three UART channels, three simplified I²C (RIIC) channels, and one full I²C (IICA) channel. All interfaces are multiplexed onto GPIO pins and configurable via peripheral I/O redirection registers (PIOR), allowing flexible routing without PCB redesign.
Is an external crystal required for real-time clock operation on the R5F121BAMFP#50?
No, the R5F121BAMFP#50 includes a dedicated low-speed on-chip oscillator for RTC operation, eliminating the need for an external 32.768 kHz crystal. The RTC provides 99-year calendar, alarm function, and clock correction - all functional with only the internal oscillator, reducing BOM count and board area for the R5F121BAMFP#50.
R5F121BAMFP#50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BAMFP#50 FAQ
1.How can I place an order for R5F121BAMFP#50 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAMFP#50 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#50 reliable?
The price and inventory of R5F121BAMFP#50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAMFP#50 is usually 5 days.
3.What payment methods are accepted for R5F121BAMFP#50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAMFP#50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAMFP#50?
R5F121BAMFP#50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAMFP#50 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#50?
For technical support, including R5F121BAMFP#50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAMFP#50 requirements.
6.How does Aetrix verify that R5F121BAMFP#50 is sourced from the original manufacturer or authorized distributors?
All R5F121BAMFP#50 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#50 meets industry standards.
7.What is the process for return or replacement of R5F121BAMFP#50?
All R5F121BAMFP#50 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAMFP#50, 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#50 part is unused and in its original packaging.
Return procedure for R5F121BAMFP#50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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