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Renesas R5F121BAMNA#00
- Part No.:
- R5F121BAMNA#00
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
R5F121BAMNA#00.pdf
- Description:
- 16BIT MCU RL78/G16 16K 32HWQFN -
- Quantity:
- Payment:
- Shipping:
Inventory:2,226
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Product details
Overview
R5F121BAMNA#00 from Renesas Electronics is a 32-pin, 32 KB flash, 2 KB RAM RL78/G16 16-bit microcontroller in HWQFN-32 (5 × 5 mm, 0.5-mm pitch) package, operating from 2.4–5.5 V with −40 to +125°C industrial temperature rating. It integrates an 8/10-bit ADC (11-channel), capacitive touch sensing unit (15-channel), real-time clock with calendar, and dual SPI/I²C/UART interfaces - deployed in motor control subsystems for HVAC actuators.
For engineers reviewing the R5F121BAMNA#00 datasheet, R5F121BAMNA#00 pinout, R5F121BAMNA#00 application, or R5F121BAMNA#00 equivalent, key selection criteria include its M-grade extended temperature support, on-chip CTSU for touch HMI, and hardware-based BGO-free data flash rewrite capability at full VDD range.
Technical Context
The R5F121BAMNA#00 implements the RL78 CPU core with 3-stage pipeline CISC architecture, supporting instruction execution times from 0.0625 μs (@16 MHz high-speed oscillator) to 30.5 μs (@32.768 kHz subsystem clock). Its memory subsystem includes 32 KB code flash (1 KB block erase), 1 KB data flash (512 B blocks, 32-bit rewrite units), and 2 KB SRAM.
Peripheral integration includes eight 16-bit timers, one 12-bit interval timer, watchdog timer, RTC2 with 99-year calendar and alarm, up to three simplified SPI/UART/I²C channels, and a dedicated capacitive touch sensing unit (CTSU) supporting self- and mutual-capacitance configurations across 15 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | RL78 16-bit CISC with 3-stage pipeline, 1 MB address space |
| Flash / RAM | 32 KB code flash (1 KB erase blocks); 1 KB data flash (512 B blocks, 1M rewrite cycles); 2 KB on-chip RAM |
| Operating Voltage | 2.4 V to 5.5 V - enables direct interface with 3.3 V and 5 V logic without level shifters |
| Temperature Range | −40°C to +125°C (M-grade) - qualified for under-hood automotive and industrial power electronics |
| ADC | 8/10-bit resolution, 11 analog inputs, internal reference (0.815 V), temperature sensor, and touch voltage support |
| CTSU | 15-channel capacitive touch sensing unit - supports up to 16 keys via mutual-capacitance matrix |
| Oscillators | High-speed on-chip oscillator (16/8/4/2/1 MHz, ±1.5% @ −40 to +125°C); 32.768 kHz subsystem clock |
Pinout & Package
Package: HWQFN-32 (5.0 × 5.0 mm, 0.5-mm pitch), exposed die pad (non-electrical, requires thermal pad connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also serves as serial array output and I²C SCLA0 when remapped |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | Primary UART receive input with analog input (ANI0); supports debug communication and serial data ingress |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sense channel (TSCAP); also provides analog input, buzzer output, and voltage comparator output |
| P125 | RESET / INTP1 | Active-low reset input with interrupt capability - enables system-level fault recovery and wake-up from STOP mode |
| VDD / VSS | Power supply / Ground | Dual VDD/VSS pairs ensure stable core and I/O rail operation; exposed die pad improves thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power STOP/HALT modes | Enables sub-μA standby current - critical for battery-powered HVAC sensors and smart thermostats |
| On-chip CTSU with self/mutual capacitance | Eliminates external touch controller ICs; supports 15-key self-cap or 16-key matrix layout with no firmware overhead |
| RTC2 with calendar and alarm | Hardware-accelerated 99-year calendar with automatic leap-year correction and alarm-triggered wake-up |
| Hardware data flash rewrite | 1 KB data flash rewritten at full VDD (2.4–5.5 V) without code flash interference - simplifies field firmware parameter updates |
| Multiple serial interfaces | Three independent serial array units support concurrent SPI, UART, and I²C - enables simultaneous motor driver comms and sensor polling |
Applications
| Smart Thermostat HMI | HVAC Actuator Control |
|---|---|
|
Use Scenario: Residential smart thermostat with capacitive touch buttons and ambient temperature/humidity sensing. IC Role / Device Role / Timing Role: Main system MCU handling touch input decoding, sensor ADC acquisition, display driving, and wireless module interfacing. Use Value: Integrated CTSU eliminates external touch IC; 11-channel ADC directly reads thermistor, humidity, and voltage rails; RTC2 maintains accurate scheduling. |
Use Scenario: Brushless DC motor actuator for damper positioning in commercial HVAC duct systems. IC Role / Device Role / Timing Role: Real-time motor commutation controller using 16-bit timer PWM outputs and ADC feedback sampling. Use Value: Eight 16-bit timers provide precise phase timing; 10-bit ADC samples current/voltage at ≤1 μs conversion time; M-grade temp rating ensures reliability near hot ducts. |
| Industrial Panel Controller | Energy Metering Subsystem |
|
Use Scenario: Local HMI panel for programmable logic controller (PLC) cabinets with push-button emulation and status LEDs. IC Role / Device Role / Timing Role: Dedicated interface MCU managing button debouncing, LED dimming via PWM, and RS-485 Modbus slave communication. Use Value: Simplified SPI/I²C/UART peripherals enable drop-in integration with display drivers and transceivers; STOP mode reduces idle power in unattended cabinets. |
Use Scenario: Auxiliary metering module monitoring auxiliary loads (pumps, fans) in building energy management systems. IC Role / Device Role / Timing Role: Data acquisition node performing periodic voltage/current sampling, CRC-protected storage, and timestamped logging. Use Value: Hardware RTC2 timestamps all logs; 1 KB data flash stores 10,000+ timestamped entries with 1M-cycle endurance; 2.4–5.5 V operation matches wide-input power supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BCMNA#00 | Same package, pinout, and peripherals; G-grade (−40 to +105°C) instead of M-grade | Suitable for non-under-hood industrial environments where 125°C operation is not required | Select when ambient temperature stays below +105°C and cost optimization is prioritized |
| R5F121BCANA#00 | A-grade (−40 to +85°C), same 32 KB flash and HWQFN-32 package but consumer temperature rating | Applicable only in climate-controlled indoor equipment with no thermal stress | Choose only for cost-sensitive consumer-grade HVAC accessories with verified thermal margins |
Compared with R5F121BCMNA#00 and R5F121BCANA#00, the R5F121BAMNA#00 uniquely supports continuous operation up to +125°C while retaining identical peripheral configuration and flash/RAM resources - making it the sole option for thermally demanding actuator and power-stage control roles.
Availability
R5F121BAMNA#00 is available at Aetrix Electronics and suitable for HVAC actuator control, smart thermostat HMI, and industrial panel controller applications requiring stable component supply across extended temperature ranges.
Supply support for R5F121BAMNA#00 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 Japanese semiconductor manufacturer specializing in microcontrollers, analog, and power devices for automotive, industrial, and IoT markets.
The RL78/G16 product line delivers ultra-low-power 16-bit MCUs with integrated capacitive touch and robust industrial temperature support - designed specifically for cost-sensitive, thermally demanding embedded controls.
FAQ
What is the maximum operating temperature specification for the R5F121BAMNA#00?
The R5F121BAMNA#00 is rated for continuous operation from −40°C to +125°C (M-grade), validated per Renesas' industrial qualification standards. This makes it suitable for placement near heat-generating components such as motor drivers or power converters in HVAC systems. The device maintains full functionality-including ADC accuracy, CTSU sensitivity, and flash write endurance-across this full range.
Does the R5F121BAMNA#00 support background data flash programming?
No, the R5F121BAMNA#00 does not support background operation (BGO) during data flash rewriting. Execution from code flash memory is halted while data flash is being rewritten, as confirmed in the R01DS0431EJ0130 datasheet Section 1.1. This requires careful state management in firmware - typically using STOP mode entry or critical section locking to prevent corruption during update sequences.
How many capacitive touch channels does the R5F121BAMNA#00 support, and what configurations are available?
The R5F121BAMNA#00 integrates a dedicated Capacitive Touch Sensing Unit (CTSU) supporting up to 15 channels. It operates in self-capacitance mode (one key per pin, up to 15 keys) or mutual-capacitance mode (matrix configuration using transmit/receive pin combinations, supporting up to 16 keys). All CTSU functions are hardware-accelerated with no CPU intervention required during sensing cycles.
What oscillator options are available on the R5F121BAMNA#00, and what is their accuracy over temperature?
The R5F121BAMNA#00 includes a high-speed on-chip oscillator selectable at 16/8/4/2/1 MHz with ±1.5% accuracy over −40°C to +125°C (M-grade), and a dedicated 32.768 kHz subsystem clock for RTC2. External crystal support (X1/X2) is provided for higher-precision timing, but the on-chip oscillator eliminates BOM cost and board space for most industrial HMI and control applications.
Is the R5F121BAMNA#00 pin-compatible with other RL78/G16 variants in HWQFN-32 packaging?
Yes, the R5F121BAMNA#00 shares identical pinout, package dimensions (5.0 × 5.0 mm HWQFN), and electrical characteristics with all other RL78/G16 32-pin HWQFN variants including R5F121BCMNA#00 and R5F121BCANA#00. Pin compatibility extends to all digital I/O, analog inputs, power, and debug signals - enabling single PCB design reuse across A/G/M temperature grades.
R5F121BAMNA#00 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-WFQFN Exposed Pad
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BAMNA#00 FAQ
1.How can I place an order for R5F121BAMNA#00 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAMNA#00 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 R5F121BAMNA#00 reliable?
The price and inventory of R5F121BAMNA#00 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAMNA#00 is usually 5 days.
3.What payment methods are accepted for R5F121BAMNA#00?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAMNA#00 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAMNA#00?
R5F121BAMNA#00 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAMNA#00 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 R5F121BAMNA#00?
For technical support, including R5F121BAMNA#00 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAMNA#00 requirements.
6.How does Aetrix verify that R5F121BAMNA#00 is sourced from the original manufacturer or authorized distributors?
All R5F121BAMNA#00 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 R5F121BAMNA#00 meets industry standards.
7.What is the process for return or replacement of R5F121BAMNA#00?
All R5F121BAMNA#00 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAMNA#00, 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 R5F121BAMNA#00 part is unused and in its original packaging.
Return procedure for R5F121BAMNA#00:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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