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Renesas R5F121BAAFP#70
- Part No.:
- R5F121BAAFP#70
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BAAFP#70.pdf
- Description:
- 16-BIT GENERAL MCU RL78/G16 16K
- Quantity:
- Payment:
- Shipping:
Inventory:3,876
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Product details
Overview
R5F121BAAFP#70 from Renesas Electronics is a 32-pin LQFP-packaged 16-bit RL78/G16 microcontroller with 16 KB flash, 2 KB RAM, and integrated capacitive touch sensing (15-channel CTSU), designed for low-power industrial human-machine interface applications operating from −40°C to +85°C.
For engineers reviewing the R5F121BAAFP#70 datasheet, R5F121BAAFP#70 pinout, R5F121BAAFP#70 application, or R5F121BAAFP#70 equivalent, this page delivers verified technical context, real-world use cases, pin-level design meaning, and validated alternative options for embedded control and touch-enabled systems.
Technical Context
The R5F121BAAFP#70 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), and features an on-chip high-speed oscillator with ±1.0% accuracy across −20°C to +85°C.
It integrates a 10-bit A/D converter with up to 11 analog inputs, two comparators, eight 16-bit timers, a real-time clock with calendar function, and three serial interfaces including UART, simplified SPI (CSI), and I²C - all configurable via peripheral I/O redirection registers (PIOR).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | RL78 16-bit CISC CPU with 3-stage pipeline and 1 MB address space |
| Flash / RAM | 16 KB code flash memory (1 KB block size); 2 KB on-chip RAM |
| Operating Voltage | 2.4 V to 5.5 V single supply - enables direct battery or unregulated rail operation |
| A/D Converter | 10-bit resolution, 11-channel input, internal reference (0.815 V), temperature sensor, and touch voltage support |
| Capacitive Touch | 15-channel CTSU supporting self-capacitance (15 keys) or mutual-capacitance matrix (up to 16 keys) |
| Timers & RTC | Eight 16-bit timer channels, one 12-bit interval timer, one watchdog timer, and RTC with 99-year calendar and alarm |
| Package | 32-pin LQFP (7.0 × 7.0 mm, 0.8-mm pitch), RoHS-compliant, industrial-grade reflow profile |
Pinout & Package
32-pin plastic LQFP package (7.0 × 7.0 mm, 0.8-mm pitch), exposed pad not electrically connected; compatible with standard surface-mount assembly and IPC-7351B footprint PLQP0032GB-A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / TxD0 / SO00 | Primary UART transmit output; also functions as serial shift-out clock for CSI/SI/O |
| P01 | TOOLRxD / RxD0 / SI00 / ANI0 | Primary UART receive input with analog channel 0; supports debug communication and serial data input |
| P02 | TSCAP / ANI1 / VCOUT0 / PCLBUZ0 | Dedicated touch-sensing input with internal charge pump; also serves as buzzer driver and analog input 1 |
| P125 | RESET / INTP1 / INTP0 | Active-low reset input with dual interrupt capability; requires external pull-up and debouncing for robust system startup |
| VDD / VSS | Power supply / Ground | Single 2.4–5.5 V supply pair; decoupling capacitors required within 5 mm of each VDD pin per layout guidelines |
| P41 | RTC1HZ / TS13 / TI03 / TO03 | Real-time clock 1 Hz output with touch-sensing channel 13 and timer I/O - enables low-power timekeeping and HMI wake-up |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power HALT/STOP modes | Reduces current draw to sub-μA levels while retaining RAM and register state - critical for battery-powered touch interfaces |
| On-chip debug with no boot swap | Enables in-circuit debugging and flash programming without external emulator hardware or bootloader partitioning |
| Self-programmable flash | Allows firmware updates in-system using standard code - no external programmer needed for field upgrades |
| Peripheral I/O redirection (PIOR) | Permits dynamic remapping of serial, timer, and interrupt functions to alternate pins - increases PCB layout flexibility |
| Capacitive touch with noise immunity | CTSU includes built-in noise cancellation and automatic calibration - eliminates need for external RC networks in noisy environments |
Applications
| Home Appliance Control Panel | Industrial HMI Keypad |
|---|---|
|
Use Scenario: Touch-sensitive front panel on microwave oven or washing machine with LED feedback and motor control. IC Role / Device Role / Timing Role: Main system controller executing UI logic, reading capacitive keys, driving buzzer and display, and managing appliance timing sequences. Use Value: Single-chip integration of touch sensing, UART for display comms, and real-time clock for cycle timing reduces BOM count by ≥3 discrete components. |
Use Scenario: Dust-resistant operator keypad in factory automation equipment with status LEDs and relay control. IC Role / Device Role / Timing Role: Dedicated HMI processor handling key scan, LED PWM dimming, and RS-485 UART communication to PLC. Use Value: Built-in 16-bit timers and GPIO drive strength (6 V tolerant on select pins) eliminate external level shifters and timing ICs. |
| Smart Thermostat Interface | Medical Device User Module |
|
Use Scenario: Wall-mounted HVAC controller with ambient temperature sensing, touch slider, and wireless module interface. IC Role / Device Role / Timing Role: Sensor hub and UI coordinator - reads thermistor/ADC, processes touch gestures, and manages low-power sleep/wake cycles. Use Value: Integrated 10-bit ADC with internal reference and CTSU enables accurate analog sensing and touch without external precision references. |
Use Scenario: Patient-facing control module on infusion pump with tactile feedback, error alerts, and battery monitoring. IC Role / Device Role / Timing Role: Safety-monitored UI controller performing touch validation, buzzer tone generation, and battery voltage supervision. Use Value: On-chip voltage supervisor, watchdog timer, and STOP mode with RTC wake-up meet IEC 62304 Class B software safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCAFP#70 | 32 KB flash (vs. 16 KB), same package and peripherals | Required when firmware exceeds 16 KB or future-proofing for feature expansion | Select if application demands >16 KB code space while retaining identical pinout and timing behavior |
| R5F121BAAGP#70 | LQFP-32 package, −40°C to +105°C rating (G grade), same memory and peripherals | Suitable for extended-temperature industrial enclosures without forced cooling | Choose for deployments where ambient temperature exceeds +85°C but full M-grade (125°C) is unnecessary |
Compared with R5F121BAAFP#70, R5F121BCAFP#70 provides double flash capacity for complex firmware, while R5F121BAAGP#70 extends thermal range without altering code or layout - both retain identical peripheral configuration and CTSU performance.
Availability
R5F121BAAFP#70 is available at Aetrix Electronics and suitable for home appliance control panels, industrial HMI keypads, smart thermostats, and medical device user modules requiring stable component supply and long-term industrial lifecycle support.
Supply support for R5F121BAAFP#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 embedded systems - balancing energy efficiency, integration, and ease of certification.
FAQ
What is the maximum operating frequency and corresponding instruction speed for the R5F121BAAFP#70?
The R5F121BAAFP#70 supports a maximum high-speed on-chip oscillator frequency of 16 MHz, delivering a minimum instruction execution time of 0.0625 μs under those conditions. It also operates at ultra-low speeds down to 32.768 kHz for RTC and standby functions, with instruction time extending to 30.5 μs. This dual-speed capability is managed entirely in hardware without software intervention.
Does the R5F121BAAFP#70 support background data flash rewriting while executing code from main flash?
No, the R5F121BAAFP#70 does not support background operation (BGO) for data flash. During data flash memory rewriting, instruction execution from code flash memory is halted. The device requires careful sequencing - typically entering STOP mode or halting CPU execution - before initiating data flash writes to ensure integrity and avoid bus conflicts.
How many capacitive touch channels does the R5F121BAAFP#70 support, and what configurations are available?
The R5F121BAAFP#70 integrates a 15-channel Capacitive Touch Sensing Unit (CTSU). It supports self-capacitance mode (one pin per key, up to 15 keys) and mutual capacitance mode (matrix configuration using transmit/receive pin selection from the same 15 pins, supporting up to 16 keys). Both modes operate with built-in noise cancellation and auto-calibration.
What are the supported serial communication interfaces on the R5F121BAAFP#70?
The R5F121BAAFP#70 provides up to three UART channels, up to three simplified SPI (CSI) channels, up to three simplified I²C (SIIC) channels, and one full I²C interface. All are multiplexed across GPIO pins and configurable via the Peripheral I/O Redirection Register (PIOR), enabling flexible routing without hardware changes.
Is the R5F121BAAFP#70 pin-compatible with other RL78/G16 variants in the same LQFP-32 package?
Yes, the R5F121BAAFP#70 shares identical pinout and electrical characteristics with all other RL78/G16 devices in the 32-pin LQFP package (e.g., R5F121BCAFP#70, R5F121BAAGP#70), including identical VDD/VSS placement, RESET location, and peripheral pin mappings - enabling drop-in replacement for memory or temperature grade upgrades.
R5F121BAAFP#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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BAAFP#70 FAQ
1.How can I place an order for R5F121BAAFP#70 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAAFP#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 R5F121BAAFP#70 reliable?
The price and inventory of R5F121BAAFP#70 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAAFP#70 is usually 5 days.
3.What payment methods are accepted for R5F121BAAFP#70?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAAFP#70 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAAFP#70?
R5F121BAAFP#70 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAAFP#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 R5F121BAAFP#70?
For technical support, including R5F121BAAFP#70 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAAFP#70 requirements.
6.How does Aetrix verify that R5F121BAAFP#70 is sourced from the original manufacturer or authorized distributors?
All R5F121BAAFP#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 R5F121BAAFP#70 meets industry standards.
7.What is the process for return or replacement of R5F121BAAFP#70?
All R5F121BAAFP#70 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAAFP#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 R5F121BAAFP#70 part is unused and in its original packaging.
Return procedure for R5F121BAAFP#70:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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