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Renesas R5F121BCMFP#50
- Part No.:
- R5F121BCMFP#50
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
R5F121BCMFP#50.pdf
- Description:
- RL78/G16 FLASH:32KB, 32PIN LQFP
- Quantity:
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Inventory:2,000
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Product details
Overview
R5F121BCMFP#50 from Renesas Electronics is a 32-pin LQFP-packaged 16-bit RL78/G16 microcontroller with 32 KB code flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU), designed for industrial control systems operating up to +125°C. It features an ultra-low-power RL78 CPU core (0.0625 μs min instruction time @16 MHz), 16-bit timer array (8 channels), 10-bit A/D converter (11-channel), and real-time clock with calendar function.
For engineers reviewing the R5F121BCMFP#50 datasheet, R5F121BCMFP#50 pinout, R5F121BCMFP#50 application, or R5F121BCMFP#50 equivalent, this page delivers verified technical context, package-specific pin mapping, low-power timing architecture details, and industrial-grade alternative options aligned with Renesas' RL78/G16 family specifications.
Technical Context
The R5F121BCMFP#50 implements the RL78 CPU core with CISC architecture and 3-stage pipeline, supporting configurable instruction execution times from 0.0625 μs (16 MHz high-speed on-chip oscillator) to 30.5 μs (32.768 kHz subsystem clock). Its memory subsystem includes 32 KB code flash (1 KB block size, erase-before-write), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB on-chip RAM.
Peripheral integration centers on industrial interface robustness: dual serial interfaces (I²C + simplified I²C), up to 3 UART/SPI-compatible CSI channels, 16-bit timer array (8 channels), watchdog timer with dedicated low-speed oscillator, and real-time clock with 99-year calendar, alarm, and correction functions - all operating across −40°C to +125°C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | RL78 16-bit CISC with 3-stage pipeline; enables deterministic real-time control at 0.0625 μs min instruction time. |
| Flash Memory | 32 KB code flash (1 KB erase blocks); supports in-system programming without boot swap. |
| Data Flash | 1 KB data flash (512 B blocks, 32-bit rewrite unit); rated for 1,000,000 rewrites at VDD = 2.4–5.5 V. |
| Operating Temp | −40°C to +125°C (M-grade industrial); validated for under-hood automotive and factory automation environments. |
| A/D Converter | 10-bit resolution, 11-channel input; includes internal reference (0.815 V), temperature sensor, and touch voltage selection. |
| Capacitive Touch | 15-channel CTSU supporting self- and mutual-capacitance modes; enables up to 16 keys in matrix configuration. |
| Package | 32-pin LQFP (7.0 × 7.0 mm, 0.8-mm pitch); RoHS-compliant, industrial-grade thermal performance. |
Pinout & Package
32-pin plastic LQFP (7.0 × 7.0 mm, 0.8-mm pitch), exposed pad not electrically connected; compatible with standard reflow profiles for industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (P43) | Touch Sensing Input | CTSUs TS14 channel; supports proximity or button detection with programmable sensitivity. |
| 2 (P40) | Debug/Tool Interface | TOOL0 pin for on-chip debug communication; enables programming and real-time trace without external JTAG adapter. |
| 3 (P125) | Reset & Interrupt Input | Active-low RESET with internal SPOR circuit; also serves as INTP1/INTP0 for priority interrupt chaining. |
| 4 (P137) | Timer & Interrupt Input | TI00 timer input and INTP0 external interrupt; used for precise edge-triggered event capture. |
| 7 (VSS) | Ground Reference | Dedicated analog/digital ground plane connection; decoupling required within 10 mm of pin for noise immunity. |
| 8 (VDD) | Power Supply | Single 2.4–5.5 V supply; powers all digital, analog, and touch circuitry with internal regulation. |
| 17 (P00) | UART Transmit | TOOLTxD and TxD0 output; drives RS-232/RS-485 transceivers or logic-level UART peripherals. |
| 18 (P01) | UART Receive | TOOLRxD and RxD0 input; accepts TTL/CMOS-level serial data with built-in noise filtering. |
| 19 (P02) | Touch Sense & Analog | TSCAP and ANI1 inputs; primary node for self-capacitance touch key with internal charge-transfer measurement. |
| 22 (P03) | Analog Input & Comparator | ANI2 and IVCMP0 inputs; supports differential analog sensing or comparator threshold referencing. |
| 25 (P06) | Analog Reference & Touch | IVREF1 and TS06 inputs; provides stable reference for A/D conversion or CTSU baseline calibration. |
| 32 (P41) | Real-Time Clock Output | RTC1HZ output and TS13 touch input; delivers accurate 1 Hz timing signal for calendar updates or low-power wakeups. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low-Power Operation | 61 µA/MHz active current at TA = 125°C; HALT/STOP modes reduce current to sub-µA levels for battery-backed systems. |
| Integrated Capacitive Touch | 15-channel CTSU with self/mutual capacitance support; eliminates need for external touch controller IC in HMI designs. |
| Industrial Temperature Range | Rated for −40°C to +125°C operation (M-grade); qualified for engine control units, motor drives, and industrial PLCs. |
| On-Chip Debug & Programming | Full on-chip debug via TOOL0/TOOLRxD/TOOLTxD pins; no external debugger hardware required for firmware development. |
| Robust Peripheral Set | 8× 16-bit timers, 1× RTC with calendar, 11-channel 10-bit ADC, 2× I²C interfaces, and 3× CSI channels for flexible system interfacing. |
Applications
| Industrial Motor Control | Smart Appliance HMI |
|---|---|
|
Use Scenario: Closed-loop speed and position control of BLDC motors in HVAC blowers and pump systems. IC Role / Device Role / Timing Role: Main system controller executing FOC algorithms, managing PWM generation via timer array, and monitoring current/voltage via 10-bit ADC. Use Value: On-chip 16-bit timers with dead-time insertion and 61 µA/MHz efficiency enable compact, thermally constrained motor drive designs. |
Use Scenario: Touch-enabled user interface for washing machines, ovens, and refrigerators with waterproof overlay support. IC Role / Device Role / Timing Role: Dedicated CTSU controller handling 15-key self-capacitance sensing while simultaneously running appliance control firmware. Use Value: Integrated 15-channel CTSU eliminates external touch IC, reducing BOM cost and PCB area by >30% versus discrete solutions. |
| Automotive Body Electronics | Factory Automation Sensor Node |
|
Use Scenario: Door module control with window lift, mirror adjustment, and interior lighting sequencing. IC Role / Device Role / Timing Role: Central MCU managing LIN bus communication, PWM-driven actuators, and CAN interface via external transceiver. Use Value: M-grade −40°C to +125°C rating and on-chip SPOR ensure reliable operation in under-dash environments without derating. |
Use Scenario: Wireless vibration/temperature sensor node in predictive maintenance systems with local processing and BLE gateway interface. IC Role / Device Role / Timing Role: Low-power sensor aggregator performing ADC sampling, FFT preprocessing, and UART-to-BLE protocol translation. Use Value: 1 MB address space and 32 KB flash support firmware-over-the-air updates and multi-sensor fusion algorithms in resource-constrained nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BAMFP#50 | 16 KB code flash, same 32-pin LQFP package and M-grade temperature range. | Suitable for cost-sensitive designs with smaller firmware footprints and reduced data logging requirements. | Select when application firmware fits within 16 KB and full 32 KB flash margin is unnecessary. |
| R5F121BCMNA#60 | Same 32 KB flash and M-grade rating, but in 32-pin HWQFN (5 × 5 mm, 0.5 mm pitch) package. | Better thermal dissipation and smaller PCB footprint; requires QFN reflow profile and exposed pad grounding. | Choose for space-constrained industrial modules where LQFP's 7 mm × 7 mm area is prohibitive. |
Compared with R5F121BCMFP#50, R5F121BAMFP#50 reduces flash capacity by 50% for lower-cost entry-level control, while R5F121BCMNA#60 maintains identical functionality in a thermally superior, space-saving QFN package requiring different layout and assembly practices.
Availability
R5F121BCMFP#50 is available at Aetrix Electronics and suitable for industrial motor control, smart appliance HMI, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BCMFP#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, power, and SoC solutions for automotive, industrial, and IoT markets.
The RL78/G16 product line delivers true low-power 16-bit MCUs with integrated capacitive touch and industrial-grade reliability, targeting cost-sensitive yet thermally demanding embedded control applications.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for the R5F121BCMFP#50?
The R5F121BCMFP#50 supports a maximum operating frequency of 16 MHz using its high-speed on-chip oscillator, delivering a minimum instruction execution time of 0.0625 μs. This timing is achievable across the full −40°C to +125°C industrial temperature range with ±1.5% frequency accuracy.
Does the R5F121BCMFP#50 support background data flash rewriting while executing code from main flash?
No, the R5F121BCMFP#50 does not support background operation (BGO) for data flash. During data flash rewriting, instruction execution from code flash memory is halted. Firmware must implement safe state transitions and disable interrupts before initiating write operations to prevent corruption.
How many capacitive touch channels does the R5F121BCMFP#50 provide, and what configurations are supported?
The R5F121BCMFP#50 integrates a 15-channel capacitive touch sensing unit (CTSU) supporting both self-capacitance (up to 15 independent keys) and mutual-capacitance (matrix configuration supporting up to 16 keys) modes. All channels are accessible via dedicated TSxx pins mapped to specific port pins in the 32-pin LQFP package.
What debug interface options are available on the R5F121BCMFP#50 without external hardware?
The R5F121BCMFP#50 provides on-chip debug capability through three dedicated pins: P40 (TOOL0), P01 (TOOLRxD), and P00 (TOOLTxD). These enable full debugging, programming, and real-time trace using only a UART-to-USB bridge - no JTAG emulator or SWD probe is required.
Is the R5F121BCMFP#50 pin-compatible with other RL78/G16 variants in the same LQFP package?
Yes, all RL78/G16 devices in the 32-pin LQFP (FP) package - including R5F121BAMFP#50, R5F121BCGFP#50, and R5F121BCMFP#50 - share identical pinouts and electrical characteristics. Only flash size (16 KB vs. 32 KB) and temperature grade (A/G/M) differ between these orderable variants.
R5F121BCMFP#50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- -
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
R5F121BCMFP#50 FAQ
1.How can I place an order for R5F121BCMFP#50 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCMFP#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 R5F121BCMFP#50 reliable?
The price and inventory of R5F121BCMFP#50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCMFP#50 is usually 5 days.
3.What payment methods are accepted for R5F121BCMFP#50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCMFP#50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCMFP#50?
R5F121BCMFP#50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCMFP#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 R5F121BCMFP#50?
For technical support, including R5F121BCMFP#50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCMFP#50 requirements.
6.How does Aetrix verify that R5F121BCMFP#50 is sourced from the original manufacturer or authorized distributors?
All R5F121BCMFP#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 R5F121BCMFP#50 meets industry standards.
7.What is the process for return or replacement of R5F121BCMFP#50?
All R5F121BCMFP#50 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCMFP#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 R5F121BCMFP#50 part is unused and in its original packaging.
Return procedure for R5F121BCMFP#50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BCMFP#50 Tags
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