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Renesas R5F121BAMNA#40
- Part No.:
- R5F121BAMNA#40
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
R5F121BAMNA#40.pdf
- Description:
- 16BIT MCU RL78/G16 16K 32HWQFN -
- Quantity:
- Payment:
- Shipping:
Inventory:4,636
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Product details
Overview
R5F121BAMNA#40 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#40 datasheet, R5F121BAMNA#40 pinout, R5F121BAMNA#40 application, or R5F121BAMNA#40 equivalent, key selection criteria include its M-grade extended temperature support, on-chip CTSU for touch HMI, hardware RTC with alarm and correction, and dual serial array units enabling concurrent I²C master/slave operation without CPU intervention.
Technical Context
The R5F121BAMNA#40 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 blocks), 1 KB data flash (512 B blocks, 1M rewrite cycles), and 2 KB SRAM.
Peripheral integration centers on low-power system management: HALT/STOP modes, on-chip SPOR reset with 3-level threshold selection, and dedicated low-speed watchdog timer. The CTSU supports both self- and mutual-capacitance configurations, while the 16-bit timer array provides 8 channels plus interval/RTC/wdog functions - all synchronized to independent clock domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | RL78 16-bit CISC CPU 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 rewrites), 2 KB on-chip RAM |
| Operating Voltage | 2.4–5.5 V single supply - enables direct battery (3.0 V Li-ion) or regulated 3.3 V/5 V rail operation |
| Temperature Range | −40 to +125°C (M-grade industrial qualification - suitable for under-hood automotive or industrial motor drives) |
| ADC | 8/10-bit SAR ADC with 11 analog inputs, internal 0.815 V reference, temperature sensor, and touch voltage selection |
| CTSU | Capacitive Touch Sensing Unit with 15 channels - supports up to 16-key mutual-capacitance matrix without external components |
| Timers | Eight 16-bit timers, one 12-bit interval timer, one watchdog timer, and RTC with 99-year calendar and alarm |
Pinout & Package
Package: HWQFN-32 (5.0 × 5.0 mm, 0.5-mm pitch) with exposed die pad requiring thermal anchoring to non-electrical PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 / SCK11 / SCL11 / SI11 / SDA11 / SCLA0 | Primary UART TX, SPI master/slave output, I²C master clock/data - configurable via PIOR for multi-protocol routing |
| P01 | TOOLRxD / ANI0 / TS00 / TI02 / TO02 / SI00 / RxD0 / SDA00 / SI11 / SDA11 / SO11 / SDAA0 | Analog input 0 + touch sense channel 0 + dual UART/SPI/I²C receive - enables simultaneous serial debug and sensor acquisition |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / INTP7 / TSCAP / TI01 / TO01 / SCK00 / SCL00 / TI02 / TO02 / SO11 / SCK20 / SCL20 | Touch sense CAP input + analog input 1 + buzzer output - direct CTSU electrode drive with programmable charge current |
| P125 | RESET / INTP1 / VCOUT0 / VCOUT1 / INTP0 / SI11 | Dedicated active-low reset with glitch filtering; dual VCOUT outputs support external voltage monitoring or comparator reference sharing |
| VDD / VSS | Power supply / Ground | Single 2.4–5.5 V supply domain; separate analog/digital ground not required - simplifies 2-layer PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| Low-power operation | 61 µA/MHz active current at TA = 125°C - enables thermally constrained designs without forced cooling |
| Hardware RTC | Calendar mode with alarm, clock correction, and 32.768 kHz crystal support - eliminates external RTC IC and backup battery |
| Capacitive touch interface | Self- and mutual-capacitance modes with built-in noise suppression - achieves >60 dB common-mode rejection in noisy motor environments |
| Serial array units | Two independent serial array units (SAUs) each supporting SPI/I²C/UART - allows concurrent I²C slave (sensor hub) and SPI master (display driver) |
| On-chip debug | Fully integrated on-chip debug with no external JTAG header - reduces BOM and board space for production programming |
Applications
| Motor Control Interface | Industrial Touch Panel |
|---|---|
|
Use Scenario: Closed-loop DC brushless motor control in HVAC damper actuators with position feedback and thermal monitoring. IC Role / Device Role / Timing Role: Main system controller executing PID loop, reading hall sensors via GPIO/timers, sampling thermistor via ADC, and driving MOSFET gate drivers via PWM outputs. Use Value: Integrated 16-bit timers with dead-time insertion and 11-channel ADC eliminate external signal conditioning, reducing component count by ≥4 ICs. |
Use Scenario: Front-panel HMI for industrial PLC operator terminals with waterproof membrane buttons and status LEDs. IC Role / Device Role / Timing Role: Dedicated touch controller managing up to 15 self-capacitance keys and driving 8-segment LED displays via SCK00/SCL00 hardware peripherals. Use Value: On-chip CTSU with automatic drift compensation maintains button reliability across −40 to +125°C ambient swings without recalibration. |
| Smart Energy Metering | Automotive Body Controller |
|
Use Scenario: DIN-rail mounted electricity meter with tamper detection, real-time tariff switching, and RS-485 communication. IC Role / Device Role / Timing Role: System-on-chip handling metrology ADC sampling, RTC-based billing intervals, secure firmware updates over UART, and isolated RS-485 transceiver control. Use Value: Hardware RTC with calendar and alarm enables precise time-of-use billing without external time sync, meeting IEC 62053-21 Class 1 accuracy requirements. |
Use Scenario: Under-dash body control module managing power windows, door locks, and interior lighting with LIN bus diagnostics. IC Role / Device Role / Timing Role: Secondary controller interfacing with main ECU via LIN physical layer (using UART + external transceiver), monitoring switch inputs, and driving LED drivers. Use Value: M-grade temperature range and HALT mode enable reliable operation near engine heat sources while achieving <10 µA standby current for battery load management. |
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#40 | Same package and pinout, but G-grade (−40 to +105°C) and 32 KB flash - lacks M-grade extended temperature qualification | Suitable for industrial controls where ambient does not exceed +105°C; not qualified for under-hood automotive use | Select when cost-sensitive designs require identical footprint but relaxed thermal spec |
| R5F121BCANA#40 | A-grade (−40 to +85°C), same 32 KB flash and HWQFN-32 package - lower temperature rating and consumer qualification | Targeted at white goods or consumer appliances with controlled thermal environments; not rated for industrial automation | Choose for cost-optimized consumer products where extended temperature operation is unnecessary |
Compared with R5F121BCMNA#40 and R5F121BCANA#40, the R5F121BAMNA#40 uniquely delivers full M-grade qualification (−40 to +125°C) with identical 32-pin HWQFN packaging and peripheral set - making it the only option among the three for thermally demanding automotive body electronics or industrial motor drives requiring continuous high-temperature operation.
Availability
R5F121BAMNA#40 is available at Aetrix Electronics and suitable for motor control interfaces, industrial touch panels, smart energy metering, and automotive body controllers requiring stable component supply across extended temperature ranges.
Supply support for R5F121BAMNA#40 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 industrial, automotive, and IoT markets.
The RL78/G16 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, thermally constrained embedded systems - combining capacitive touch, hardware RTC, and dual serial interfaces in compact QFN packages.
FAQ
What is the maximum operating frequency and corresponding instruction cycle time for the R5F121BAMNA#40?
The R5F121BAMNA#40 supports a maximum high-speed on-chip oscillator frequency of 16 MHz, delivering a minimum instruction execution time of 0.0625 μs. This timing is achievable using the internal oscillator without external crystals, reducing BOM cost and board space. The device also supports ultra-low-speed operation at 32.768 kHz with 30.5 μs instruction time for ultra-low-power RTC or sleep-mode tasks. All timing specifications are validated across the full −40 to +125°C temperature range.
Does the R5F121BAMNA#40 support background data flash rewriting while executing code from main flash memory?
No, the R5F121BAMNA#40 does not support background operation (BGO) for data flash rewriting. During data flash write/erase operations, the CPU cannot execute instructions from code flash memory - requiring careful state management and interrupt masking. This behavior is documented in the datasheet Section 1.1 "Data flash memory" and applies uniformly across all RL78/G16 variants including the R5F121BAMNA#40.
How many capacitive touch sensing channels does the R5F121BAMNA#40 support, and what configuration modes are available?
The R5F121BAMNA#40 integrates a dedicated Capacitive Touch Sensing Unit (CTSU) supporting 15 channels. It operates in two modes: self-capacitance (one pin per key, up to 15 keys) and mutual capacitance (matrix configuration using transmit/receive pin pairs from the same 15 pins, supporting up to 16 keys). Both modes include hardware-based noise cancellation and automatic drift compensation - features confirmed for the R5F121BAMNA#40 in the RL78/G16 datasheet Section 1.1.
What serial communication interfaces are implemented in hardware on the R5F121BAMNA#40, and how many instances are available?
The R5F121BAMNA#40 includes two independent Serial Array Units (SAUs), each configurable as SPI, I²C, or UART. This provides up to two SPI masters/slaves, two I²C masters/slaves, or two UARTs - with flexible pin mapping via the Peripheral I/O Redirection Register (PIOR). The datasheet confirms SAU0 and SAU1 support for the 32-pin HWQFN package variant, enabling concurrent protocols such as I²C sensor hub + SPI display driver without software bit-banging.
Is the R5F121BAMNA#40 pin-compatible with other RL78/G16 32-pin variants like R5F121BCMNA#40 or R5F121BCANA#40?
Yes, the R5F121BAMNA#40 is pin-compatible with R5F121BCMNA#40 and R5F121BCANA#40 - all share identical HWQFN-32 (5 × 5 mm) mechanical dimensions, pin count, pin numbering, and electrical pin functions. Differences are limited to temperature grade (M vs. G vs. A) and qualification testing; no PCB layout changes are required when substituting between these variants in the same design.
R5F121BAMNA#40 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-WFQFN Exposed Pad
- Series:
- RL78/G16
- Packaging:
- Tape & Reel (TR)
- 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#40 FAQ
1.How can I place an order for R5F121BAMNA#40 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BAMNA#40 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#40 reliable?
The price and inventory of R5F121BAMNA#40 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BAMNA#40 is usually 5 days.
3.What payment methods are accepted for R5F121BAMNA#40?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BAMNA#40 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BAMNA#40?
R5F121BAMNA#40 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BAMNA#40 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#40?
For technical support, including R5F121BAMNA#40 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BAMNA#40 requirements.
6.How does Aetrix verify that R5F121BAMNA#40 is sourced from the original manufacturer or authorized distributors?
All R5F121BAMNA#40 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#40 meets industry standards.
7.What is the process for return or replacement of R5F121BAMNA#40?
All R5F121BAMNA#40 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BAMNA#40, 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#40 part is unused and in its original packaging.
Return procedure for R5F121BAMNA#40:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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