My Inquiry
My Account
Renesas R5F121BCAFP#50
- Part No.:
- R5F121BCAFP#50
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
R5F121BCAFP#50.pdf
- Description:
- 16BIT MCU RL78/G16 32K 32LQFP -4
- Quantity:
- Payment:
- Shipping:
Inventory:3,211
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
R5F121BCAFP#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 low-power industrial control applications operating from 2.4 V to 5.5 V across −40°C to +105°C.
For engineers reviewing the R5F121BCAFP#50 datasheet, R5F121BCAFP#50 pinout, R5F121BCAFP#50 application, or R5F121BCAFP#50 equivalent, key selection criteria include its 32-pin LQFP-0.8mm package, 16-bit RL78 CPU core with 3-stage pipeline, on-chip RTC with 99-year calendar, and support for up to 11-channel 10-bit A/D conversion in industrial temperature grade.
Technical Context
The R5F121BCAFP#50 implements the RL78 CPU core with CISC architecture, supporting configurable instruction execution time from 0.0625 μs (@16 MHz high-speed oscillator) to 30.5 μs (@32.768 kHz subsystem clock). It integrates a dedicated low-speed on-chip oscillator for watchdog timer operation independent of main clock domain.
Its peripheral set includes eight 16-bit timers, one 12-bit interval timer, one real-time clock (RTC2) with alarm and correction functions, and dual serial interfaces: simplified SPI (CSI), UART, and I²C - all configurable via peripheral I/O redirection registers (PIOR) to remap functions across multiple pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | RL78 16-bit CISC with 3-stage pipeline; enables deterministic timing for real-time control loops. |
| Flash Memory | 32 KB code flash (1 KB block size); supports in-system programming without boot swap. |
| Data Flash | 1 KB data flash (512 B blocks, 32-bit rewrite unit); rated for 1 million rewrites at full VDD range. |
| Operating Voltage | 2.4 V to 5.5 V; allows direct interface with legacy 3.3 V and 5 V logic without level shifters. |
| Temperature Range | −40°C to +105°C (G-grade); qualified for industrial motor drives and HVAC control environments. |
| A/D Converter | 10-bit resolution, 11 analog inputs; includes internal reference (0.815 V) and temperature sensor for self-calibration. |
| Capacitive Touch | 15-channel CTSU supporting self- and mutual-capacitance modes; enables robust touch buttons without external components. |
Pinout & Package
32-pin plastic LQFP package (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 |
|---|---|---|
| P00 | TOOLTxD / SO00 / TxD0 | Primary UART transmit output; also serves as serial array output and clocked serial interface TX. |
| P01 | TOOLRxD / ANI0 / SI00 / RxD0 | Analog input channel 0 and primary UART receive; supports simultaneous debug communication and sensor acquisition. |
| P02 | PCLBUZ0 / ANI1 / VCOUT0 / TSCAP | Capacitive touch sensing input with built-in voltage comparator output; enables single-pin touch key implementation. |
| P125 | RESET / INTP1 | Active-low reset input with interrupt capability; supports both power-on and external reset assertion with glitch filtering. |
| VDD | Power Supply | Main supply pin (2.4–5.5 V); decoupling required per Renesas layout guidelines for noise-sensitive analog peripherals. |
| VSS | Ground | Digital ground reference; must be connected to low-impedance PCB plane for stable ADC and CTSU operation. |
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 systems. |
| On-chip RTC2 with calendar | Provides accurate 99-year date/time tracking with alarm and auto-correction; eliminates need for external RTC IC. |
| Peripheral I/O redirection (PIOR) | Enables dynamic remapping of serial, timer, and interrupt functions across multiple pins-simplifies PCB layout and firmware reuse. |
| Integrated CTSU | Supports up to 15 self-capacitance keys or 16 mutual-capacitance keys using only MCU pins-no external RC network required. |
| High-speed on-chip oscillator | Factory-trimmed 16 MHz oscillator with ±1.0% accuracy (−20°C to +85°C); eliminates external crystal for cost-sensitive designs. |
Applications
| Industrial Motor Control | Smart Thermostat Interface |
|---|---|
|
Use Scenario: Closed-loop speed regulation of BLDC fans in HVAC systems with thermal feedback and user touch interface. IC Role / Device Role / Timing Role: Main system controller executing PID loop, managing PWM outputs, reading thermistor/ADC inputs, and scanning capacitive touch keys. Use Value: Integrated 11-channel 10-bit ADC and 15-channel CTSU eliminate external signal conditioning and touch controller ICs, reducing BOM count by ≥3 components. |
Use Scenario: Residential smart thermostat with ambient temperature sensing, humidity compensation, and multi-key capacitive UI. IC Role / Device Role / Timing Role: System-on-chip handling sensor fusion (temp/humidity), RTC-based scheduling, and low-power sleep/wake cycles. Use Value: G-grade (−40°C to +105°C) operation ensures reliability in wall-mounted enclosures exposed to seasonal ambient extremes. |
| Programmable Logic Controller (PLC) I/O Module | Industrial Panel Meter |
|
Use Scenario: DIN-rail mounted digital I/O expansion module with isolated inputs/outputs and Modbus RTU communication. IC Role / Device Role / Timing Role: Protocol handler and GPIO manager interfacing with RS-485 transceiver and opto-isolated I/O banks. Use Value: Three UART channels enable simultaneous Modbus RTU, debug console, and secondary serial interface-no external UART bridge needed. |
Use Scenario: Compact panel meter displaying real-time process variables (voltage, current, flow) with front-panel navigation keys. IC Role / Device Role / Timing Role: Data acquisition engine with 10-bit ADC, display driver interface, and capacitive navigation keypad controller. Use Value: On-chip buzzer output (PCLBUZ0) provides audible feedback without external driver circuitry-reducing component count and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| R5F121BAGFP#50 | Same 32-pin LQFP package and peripherals, but with 16 KB code flash and G-grade temp range. | Suitable for cost-sensitive industrial applications where firmware size ≤16 KB and full 32 KB is unnecessary. | Select when firmware footprint is confirmed <16 KB and BOM cost optimization is prioritized over future scalability. |
| R5F121BCMFP#50 | Identical feature set and pinout, but M-grade (−40°C to +125°C) qualification and same 32 KB flash. | Required for under-hood automotive or high-temperature industrial environments exceeding +105°C ambient. | Choose only if application ambient exceeds +105°C; otherwise, R5F121BCAFP#50 offers optimal cost/performance balance for standard industrial use. |
Compared with R5F121BAGFP#50, the R5F121BCAFP#50 provides double the code flash capacity for complex control algorithms or field-upgradable firmware, while compared with R5F121BCMFP#50, it delivers identical functionality at lower cost for applications staying within −40°C to +105°C.
Availability
R5F121BCAFP#50 is available at Aetrix Electronics and suitable for industrial motor control, smart HVAC interfaces, PLC I/O modules, and panel meter designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for R5F121BCAFP#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, 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 industrial control, home appliances, and human-machine interface applications with integrated analog and touch sensing.
FAQ
What is the maximum operating frequency of the R5F121BCAFP#50?
The R5F121BCAFP#50 supports a maximum CPU operating frequency of 16 MHz using the high-speed on-chip oscillator. This yields a minimum instruction execution time of 0.0625 μs. External crystal oscillators (X1/X2) can also be used for higher precision timing, though the internal oscillator meets most industrial timing requirements without added BOM cost.
Does the R5F121BCAFP#50 support in-application programming (IAP) of its code flash memory?
Yes, the R5F121BCAFP#50 supports self-programming of code flash memory during application execution. It includes an on-chip debug function and flash shield window protection, enabling secure firmware updates without requiring external programming hardware-critical for remote field upgrades in deployed industrial equipment.
How many analog input channels does the R5F121BCAFP#50 provide, and what is their resolution?
The R5F121BCAFP#50 features an 8/10-bit successive approximation A/D converter with up to 11 analog input channels (ANI0–ANI10). Resolution is selectable per channel; typical operation uses 10-bit mode for precision sensor measurements such as temperature, pressure, or current sensing in industrial control loops.
What is the purpose of the CTSU (Capacitive Touch Sensing Unit) in the R5F121BCAFP#50?
The CTSU in the R5F121BCAFP#50 provides hardware-accelerated capacitive touch sensing across 15 dedicated channels. It supports both self-capacitance (single-pin keys) and mutual-capacitance (matrix keypads) configurations, enabling robust, noise-immune touch interfaces without external components-ideal for industrial HMI panels exposed to EMI.
Is the R5F121BCAFP#50 pin-compatible with other RL78/G16 variants in the same package?
Yes, the R5F121BCAFP#50 is pin-compatible with all other RL78/G16 devices in the 32-pin LQFP (FP) package, including R5F121BAGFP#50 and R5F121BCMFP#50. Pin functions, power/ground locations, and peripheral mappings are identical-allowing drop-in replacement based on flash size or temperature grade without PCB redesign.
R5F121BCAFP#50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 32-LQFP
- 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:
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
R5F121BCAFP#50 FAQ
1.How can I place an order for R5F121BCAFP#50 through Aetrix?
Please submit a Request for Quotation (RFQ) for R5F121BCAFP#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 R5F121BCAFP#50 reliable?
The price and inventory of R5F121BCAFP#50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for R5F121BCAFP#50 is usually 5 days.
3.What payment methods are accepted for R5F121BCAFP#50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for R5F121BCAFP#50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for R5F121BCAFP#50?
R5F121BCAFP#50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your R5F121BCAFP#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 R5F121BCAFP#50?
For technical support, including R5F121BCAFP#50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your R5F121BCAFP#50 requirements.
6.How does Aetrix verify that R5F121BCAFP#50 is sourced from the original manufacturer or authorized distributors?
All R5F121BCAFP#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 R5F121BCAFP#50 meets industry standards.
7.What is the process for return or replacement of R5F121BCAFP#50?
All R5F121BCAFP#50 units undergo pre-shipment inspection (PSI). If there is an issue with R5F121BCAFP#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 R5F121BCAFP#50 part is unused and in its original packaging.
Return procedure for R5F121BCAFP#50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
R5F121BCAFP#50 Tags
-
ATTINY4-TSHR
Microchip Technology
-
ATTINY10-TSHR
Microchip Technology
-
ATTINY10-TS8R
Microchip Technology
-
ATTINY202-SSNR
Microchip Technology
-
ATTINY202-SSFR
Microchip Technology
-
ATTINY402-SSNR
Microchip Technology
-
PIC16F15213T-I/MF
Microchip Technology
-
PIC16F15213-E/MF
Microchip Technology
-
PIC10F200T-I/OT
Microchip Technology
-
ATTINY412-SSNR
Microchip Technology
-
PIC10F202T-I/OT
Microchip Technology
-
ATTINY404-SSNR
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
