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Renesas R5F121BCMFP#30
- Part No.:
- R5F121BCMFP#30
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
R5F121BCMFP#30.pdf
- Description:
- RL78/G16 FLASH:32KB, 32PIN LQFP
- Quantity:
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Inventory:1,224
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Product details
Overview
R5F121BCMFP#30 from Renesas Electronics is a 32-pin LQFP-packaged 16-bit RL78/G16 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 appliance control panels requiring low-power, high-integration HMI solutions.
For engineers reviewing the R5F121BCMFP#30 datasheet, R5F121BCMFP#30 pinout, R5F121BCMFP#30 application, or R5F121BCMFP#30 equivalent, key selection criteria include its M-grade temperature rating (−40°C to +125°C), 32-pin LQFP-0.8mm package, integrated CTSU for touch buttons, and dual serial array units supporting concurrent UART/CSI/I²C communication without CPU intervention.
Technical Context
The R5F121BCMFP#30 implements the RL78 CPU core with a 3-stage pipeline CISC architecture, enabling instruction execution times adjustable from 0.0625 μs (@16 MHz) to 30.5 μs (@32.768 kHz). Its memory subsystem includes 32 KB on-chip code flash (1 KB block erase), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB RAM - all operating across the full −40°C to +125°C range.
Peripheral integration centers on system-level responsiveness: 8× 16-bit timers, 12-bit interval timer, watchdog timer, RTC with alarm/correction, 2-channel comparator, and a dedicated 15-channel capacitive touch sensing unit (CTSU) supporting self- and mutual-capacitance modes - all managed via hardware acceleration to minimize CPU load during HMI polling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | 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 complex firmware with bootloader and OTA update partitioning. |
| Data Flash | 1 KB data flash (512 B blocks, 32-bit rewrite unit); retains calibration data and user settings across power cycles. |
| ADC | 8/10-bit resolution, 11 analog inputs; measures sensor signals (temperature, voltage, current) with internal 0.815 V reference. |
| CTSU | 15-channel capacitive touch unit; detects up to 16 keys in mutual-capacitance matrix mode without external components. |
| Temperature Range | −40°C to +125°C (M-grade); qualified for under-hood automotive modules and industrial motor drives. |
Pinout & Package
Package: 32-pin LQFP (7.0 × 7.0 mm, 0.8-mm pitch), lead-free, RoHS-compliant, with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also serves as serial array unit output for synchronous communication. |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | UART receive input with analog channel 0; enables debug interface and sensor signal acquisition on same pin. |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sense input with built-in voltage booster; directly connects to touch electrode without external circuitry. |
| P125 | RESET / INTP1 | Active-low reset input with interrupt capability; supports both power-on reset and external fault-triggered recovery. |
| VDD | Power Supply | Main 2.4–5.5 V supply; powers core, peripherals, and CTSU - requires local 100 nF decoupling per VDD pin. |
| VSS | Ground | Digital ground reference; must be connected to PCB ground plane with low-inductance path for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Low-power HALT/STOP modes | Reduces active current to 61 µA/MHz at 125°C; extends battery life in portable HMI devices. |
| On-chip high-speed oscillator | 16 MHz ±1.5% accuracy (−40°C to +125°C); eliminates external crystal for cost-sensitive designs. |
| Hardware-accelerated CTSU | Offloads touch scanning from CPU; supports 15-key self-cap or 16-key mutual-cap matrix with <10 ms scan time. |
| Serial Array Unit (SAU) | Configurable as 3 independent CSI/SPI or I²C channels; enables simultaneous sensor comms and display interface. |
| Real-time clock with calendar | 99-year calendar with alarm and auto-correction; maintains accurate timekeeping during STOP mode using 32.768 kHz subclock. |
| On-chip debug function | Fully supports E1/E20 emulators via TOOLRxD/TOOLTxD pins; enables in-circuit debugging without dedicated JTAG pins. |
Applications
| Smart Appliance Control Panel | Industrial Motor Drive Interface |
|---|---|
|
Use Scenario: Touch-based user interface for washing machine or HVAC controller with LED feedback and buzzer alerts. IC Role / Device Role / Timing Role: Main HMI controller handling touch detection, display updates, and relay control sequencing. Use Value: Integrated CTSU eliminates external touch ICs; 32 KB flash accommodates multi-language UI assets and safety firmware. |
Use Scenario: Local control module for BLDC motor drive with thermal monitoring, fault logging, and CAN gateway functions. IC Role / Device Role / Timing Role: System management MCU coordinating PWM generation (via external driver), ADC-based current sensing, and status reporting. Use Value: 11-channel ADC samples motor phase currents and temperature sensors simultaneously; M-grade rating ensures reliability near power stages. |
| Automotive Cabin Sensor Hub | Energy Meter Front-End Controller |
|
Use Scenario: Occupancy and ambient light sensing node in vehicle door module or center console. IC Role / Device Role / Timing Role: Sensor fusion processor aggregating capacitive touch, analog light sensor, and thermistor inputs. Use Value: CTSU + 10-bit ADC + RTC enable precise touch response and timestamped event logging - critical for ASIL-B diagnostic compliance. |
Use Scenario: Residential smart meter with tamper detection, pulse counting, and LCD display control. IC Role / Device Role / Timing Role: Metering front-end managing optical pulse input, LCD refresh, and secure data storage. Use Value: 1 KB data flash stores tariff schedules and consumption history with 1M write endurance; STOP mode reduces standby power to <1 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BAMFP#30 | Same package and pinout, but A-grade (−40°C to +85°C) and 16 KB flash. | Suitable for consumer-grade appliances without extended temperature requirements. | Select when cost sensitivity outweighs industrial temperature margin and reduced code space suffices. |
| R5F121BCGFP#30 | Same 32 KB flash and G-grade (−40°C to +105°C), but lacks M-grade thermal qualification. | Applicable in industrial controls where ambient temperature stays below +105°C. | Choose when full +125°C operation is unnecessary and lower qualification cost is prioritized. |
Compared with R5F121BAMFP#30 and R5F121BCGFP#30, the R5F121BCMFP#30 uniquely delivers full M-grade thermal robustness alongside maximum 32 KB flash - making it the only option for automotive under-dash modules or high-temperature industrial PLC I/O expanders requiring guaranteed operation at +125°C.
Availability
R5F121BCMFP#30 is available at Aetrix Electronics and suitable for smart appliance control panels, industrial motor drive interfaces, automotive cabin sensor hubs, and energy meter front-end controllers requiring stable component supply across extended temperature ranges.
Supply support for R5F121BCMFP#30 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 ICs for automotive, industrial, and IoT markets.
The RL78/G16 product line targets cost-sensitive, ultra-low-power embedded systems requiring rich analog integration and capacitive touch - designed specifically for appliance HMI, industrial sensors, and battery-powered edge nodes.
FAQ
What is the maximum operating temperature of the R5F121BCMFP#30?
The R5F121BCMFP#30 is rated for operation from −40°C to +125°C (M-grade), validated across its full electrical specification range. This makes it suitable for under-hood automotive applications and industrial environments where ambient temperatures exceed +105°C. The device maintains timing accuracy and flash reliability at this upper limit, unlike G-grade variants limited to +105°C.
Does the R5F121BCMFP#30 support in-system programming without external hardware?
Yes, the R5F121BCMFP#30 supports self-programming of both code and data flash memory using on-chip resources - no external programmer required. However, it does not include boot swap functionality or flash shield window protection. Programming is performed via the on-chip debug interface using standard Renesas E1/E20 emulators or compatible third-party tools.
How many capacitive touch channels does the R5F121BCMFP#30 support?
The R5F121BCMFP#30 integrates a dedicated Capacitive Touch Sensing Unit (CTSU) with 15 physical channels. In self-capacitance mode, it supports up to 15 independent touch keys. In mutual-capacitance mode, it enables up to 16 keys using a matrix configuration of transmit/receive pins selected from those 15 channels - all without external RC networks or dedicated touch controller ICs.
Can the R5F121BCMFP#30 operate from a single 3.3 V supply?
Yes, the R5F121BCMFP#30 operates over a 2.4 V to 5.5 V supply range, fully supporting standard 3.3 V systems. At 3.3 V, it delivers 61 µA/MHz active current and maintains full functionality of its 16 MHz on-chip oscillator (±1.5% accuracy), 10-bit ADC, CTSU, and real-time clock - eliminating need for level shifters or dual-supply design.
What serial communication interfaces are available on the R5F121BCMFP#30?
The R5F121BCMFP#30 provides three simplified SPI (CSI) channels, three UART channels, three simplified I²C channels, and one full I²C channel - all implemented in two independent Serial Array Units (SAUs). These interfaces can operate concurrently, enabling simultaneous communication with displays, sensors, and external MCUs without CPU overhead.
R5F121BCMFP#30 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Last Time Buy
- Programmable:
- -
- Core Processor:
- -
- Core Size:
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- Speed:
- -
- Connectivity:
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- Peripherals:
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- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
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- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
R5F121BCMFP#30 FAQ
1.How can I place an order for R5F121BCMFP#30 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCMFP#30 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 R5F121BCMFP#30 reliable?
The price and inventory of R5F121BCMFP#30 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCMFP#30 is usually 5 days.
3.What payment methods are accepted for R5F121BCMFP#30?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCMFP#30 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCMFP#30?
R5F121BCMFP#30 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCMFP#30 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 R5F121BCMFP#30?
For technical support, including R5F121BCMFP#30 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCMFP#30 requirements.
6.How does Aetrix verify that R5F121BCMFP#30 is sourced from the original manufacturer or authorized distributors?
All R5F121BCMFP#30 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 R5F121BCMFP#30 meets industry standards.
7.What is the process for return or replacement of R5F121BCMFP#30?
All R5F121BCMFP#30 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCMFP#30, 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 R5F121BCMFP#30 part is unused and in its original packaging.
Return procedure for R5F121BCMFP#30:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BCMFP#30 Tags
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