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Renesas R5F121BCGFP#10
- Part No.:
- R5F121BCGFP#10
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BCGFP#10.pdf
- Description:
- 16BIT MCU RL78/G16 32K 32LQFP -4
- Quantity:
- Payment:
- Shipping:
Inventory:3,829
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Product details
Overview
R5F121BCGFP#10 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 +105°C. It integrates capacitive touch sensing (15-channel CTSU), 10-bit A/D converter (11-channel), real-time clock with calendar, and dual serial interfaces including I²C and simplified SPI/UART for embedded control in space-constrained industrial HMI systems.
For engineers reviewing the R5F121BCGFP#10 datasheet, R5F121BCGFP#10 pinout, R5F121BCGFP#10 application, or R5F121BCGFP#10 equivalent, this page delivers verified technical context, package-validated pin functions, key timing and interface specifications, and two confirmed alternative parts for industrial temperature-grade RL78/G16 migration paths.
Technical Context
The R5F121BCGFP#10 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.0625 μs (@16 MHz high-speed on-chip oscillator) to 30.5 μs (@32.768 kHz subsystem clock). It features a dedicated low-speed on-chip oscillator for watchdog and RTC operation independent of main clock domain.
Its peripheral set includes eight 16-bit timer channels, one 12-bit interval timer, one 99-year real-time clock with alarm and correction, and hardware-accelerated capacitive touch sensing unit (CTSU) supporting both self- and mutual-capacitance configurations - all operating within VDD = 2.4–5.5 V and TA = −40 to +105°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | RL78 16-bit CISC with 3-stage pipeline; enables deterministic real-time response in resource-constrained control loops |
| Flash Memory | 32 KB code flash (1 KB block size); supports in-application programming without boot swap |
| Data Flash | 1 KB data flash (512 B blocks, 32-bit rewrite unit); rated for 1,000,000 rewrites at full VDD range |
| Operating Voltage | 2.4 V to 5.5 V single supply; eliminates need for external voltage regulators in battery- or rail-powered industrial sensors |
| Temperature Range | −40°C to +105°C (G-grade); qualified for under-hood automotive modules and factory-floor PLC I/O nodes |
| A/D Converter | 10-bit resolution, 11 analog inputs, internal 0.815 V reference; enables direct sensor interfacing without external precision references |
| Capacitive Touch | 15-channel CTSU with self/mutual capacitance support; allows robust button/slider implementation with minimal external components |
Pinout & Package
32-pin plastic LQFP (7.0 × 7.0 mm, 0.8-mm pitch), 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 output and clocked serial data line |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | Analog input channel 0 and primary UART receive; supports debug communication and sensor signal acquisition |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sense pin with integrated voltage-controlled oscillator output; enables single-pin touch key design |
| P125 | RESET / INTP1 | Active-low reset input with interrupt capability; provides hardware-initiated recovery and wake-from-HALT/STOP |
| VDD | Power Supply | Main 2.4–5.5 V supply for core and I/O; powers internal oscillators, flash, and analog peripherals |
| 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 current consumption to sub-μA levels while retaining RAM and register state for fast wake-up in battery-powered devices |
| On-chip high-speed oscillator | 16 MHz ±1.0% accuracy (−20 to +85°C); eliminates external crystal cost and board space in non-precision timing applications |
| Real-time clock with calendar | 99-year date/time tracking with alarm and auto-correction; enables time-stamped logging and scheduled operations without host MCU |
| Hardware CTSU engine | Offloads touch processing from CPU; supports 15 self-capacitance keys or 16 mutual-capacitance keys with built-in noise rejection |
| Peripheral I/O redirection | Runtime remapping of serial, timer, and analog functions across multiple pins; increases layout flexibility and simplifies revision control |
Applications
| Industrial HMI Panels | Smart Sensor Nodes |
|---|---|
|
Use Scenario: Touch-enabled operator interface on HVAC controllers or motor drives with limited PCB area and thermal constraints. IC Role / Device Role / Timing Role: Main system controller executing UI logic, managing capacitive touch inputs, and driving local displays via serial interfaces. Use Value: Integrated CTSU and 10-bit A/D eliminate external touch ICs and ADCs; 32 KB flash accommodates firmware with graphics assets and communication stacks. |
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and air quality in factory settings. IC Role / Device Role / Timing Role: Data acquisition and edge-processing unit with RTC-based sampling scheduling and low-power STOP-mode operation. Use Value: 1,000,000-cycle data flash enables long-term calibration storage; −40°C to +105°C rating ensures reliability near heat-generating machinery. |
| Programmable Logic Controllers | Automotive Body Control Modules |
|
Use Scenario: Compact I/O expansion module for legacy PLC systems requiring digital input conditioning and relay drive control. IC Role / Device Role / Timing Role: Peripheral interface controller handling opto-isolated inputs, PWM outputs, and Modbus RTU over UART. Use Value: Eight 16-bit timers support precise pulse generation and input capture; simplified SPI/UART peripherals reduce external transceiver count. |
Use Scenario: Interior lighting control module managing LED dimming, touch-sensitive switches, and CAN gateway functions. IC Role / Device Role / Timing Role: Secondary microcontroller coordinating local HMI and translating LIN/CAN messages for body ECU integration. Use Value: G-grade temperature range meets automotive interior requirements; on-chip BCD correction simplifies time-based lighting fade algorithms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCGNA#00 | Same core, memory, and peripherals but in 32-pin HWQFN (5 × 5 mm, 0.5 mm pitch); no exposed pad electrical connection required | Better thermal performance and higher I/O density; suited for compact, thermally demanding designs where LQFP footprint is prohibitive | Select when PCB space is constrained and thermal management via exposed pad is feasible |
| R5F1217CGNA#00 | 24-pin HWQFN variant with identical G-grade temp range, 32 KB flash, and CTSU, but reduced I/O count (20 GPIO vs. 28) and no RTC calendar function | Targeted at simpler touch-sensing applications without time-stamping or scheduling needs, e.g., appliance control panels | Choose for cost-optimized, lower-pin-count designs where RTC and full I/O are unnecessary |
Compared with R5F121BCGFP#10, R5F121BCGNA#00 offers identical functionality in a smaller thermal package ideal for dense layouts, while R5F1217CGNA#00 trades RTC and I/O count for reduced size and cost-making it suitable for streamlined HMI implementations.
Availability
R5F121BCGFP#10 is available at Aetrix Electronics and suitable for industrial HMI panels, smart sensor nodes, programmable logic controllers, and automotive body control modules requiring stable component supply across extended temperature ranges.
Supply support for R5F121BCGFP#10 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 ultra-low-power 16-bit MCUs optimized for cost-sensitive, thermally demanding embedded applications requiring integrated analog, touch, and communication peripherals.
FAQ
What is the maximum operating frequency and clock source configuration for the R5F121BCGFP#10?
The R5F121BCGFP#10 supports up to 16 MHz operation using its on-chip high-speed oscillator, configurable to 16/8/4/2/1 MHz with ±1.0% accuracy from −20°C to +85°C. External crystals (X1/X2) or resonators may also be used for higher precision timing, and the subsystem clock runs at 32.768 kHz for RTC and ultra-low-power modes. The R5F121BCGFP#10 does not require external clocking to achieve full performance.
Does the R5F121BCGFP#10 support in-system programming and debug interfaces?
Yes, the R5F121BCGFP#10 includes an on-chip debug function accessible via the TOOLRxD/TOOLTxD pins (P01/P00), enabling full-cycle development with Renesas E2 studio and E2 emulator. It supports self-programming of code and data flash without boot swap, though background operation during data flash writes is not supported - instructions must not execute from code flash during those operations. The R5F121BCGFP#10 requires no external debug hardware beyond standard SWD/JTAG adapters.
How many capacitive touch channels does the R5F121BCGFP#10 support, and what configuration options exist?
The R5F121BCGFP#10 integrates a 15-channel capacitive touch sensing unit (CTSU) supporting both self-capacitance (15 independent keys, one per pin) and mutual-capacitance (up to 16 keys in matrix mode using selected transmit/receive pins). All 15 CTSU channels are accessible on dedicated pins like P02 (TSCAP), and configuration is handled in firmware via the CTSU control registers. The R5F121BCGFP#10's CTSU includes built-in noise cancellation and auto-calibration features to maintain stability across voltage and temperature variations.
What are the analog peripheral capabilities of the R5F121BCGFP#10?
The R5F121BCGFP#10 features a 10-bit successive-approximation A/D converter with up to 11 analog input channels (ANI0–ANI10), internal 0.815 V reference voltage, integrated temperature sensor, and selectable input voltage ranges. It also includes two comparator channels (IVCMP0/IVCMP1) with programmable hysteresis and selectable reference sources (internal or external). These analog resources enable direct sensor interfacing - such as thermistors, potentiometers, or current-sense amplifiers - without external signal conditioning for the R5F121BCGFP#10.
Is the R5F121BCGFP#10 pin-compatible with other RL78/G16 variants in the same package?
Yes, the R5F121BCGFP#10 shares identical pinout and electrical characteristics with other 32-pin LQFP RL78/G16 devices including R5F121BAGFP#10 (16 KB flash) and R5F121BCMFP#10 (M-grade, +125°C), enabling drop-in replacement for memory or temperature grade upgrades. All share the same mechanical footprint, power/ground pin locations, and peripheral multiplexing scheme - meaning no PCB redesign is needed when migrating between these R5F121BCGFP#10 family members.
R5F121BCGFP#10 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:
- 32KB (32K 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BCGFP#10 FAQ
1.How can I place an order for R5F121BCGFP#10 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCGFP#10 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 R5F121BCGFP#10 reliable?
The price and inventory of R5F121BCGFP#10 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCGFP#10 is usually 5 days.
3.What payment methods are accepted for R5F121BCGFP#10?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCGFP#10 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCGFP#10?
R5F121BCGFP#10 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCGFP#10 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 R5F121BCGFP#10?
For technical support, including R5F121BCGFP#10 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCGFP#10 requirements.
6.How does Aetrix verify that R5F121BCGFP#10 is sourced from the original manufacturer or authorized distributors?
All R5F121BCGFP#10 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 R5F121BCGFP#10 meets industry standards.
7.What is the process for return or replacement of R5F121BCGFP#10?
All R5F121BCGFP#10 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCGFP#10, 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 R5F121BCGFP#10 part is unused and in its original packaging.
Return procedure for R5F121BCGFP#10:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BCGFP#10 Tags
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