R5F10RJCAFA#V0 - 32KB Flash 16-bit LCD MCU 52-LQFP | Renesas
MPN: R5F10RJCAFA#V0 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.55 | $35.50 |
| 100 | $3.05 | $305.00 |
| 500 | $2.65 | $1,325.00 |
| 1,000 | $2.3 | $2,300.00 |
R5F10RJCAFA#V0 Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), working RAM, peripheral set, and I/O into one package. The RL78 is Renesas' 16-bit CISC core family succeeding the 78K0R; the L12 sub-family specifically adds an integrated segment-LCD driver, multi-channel 10-bit ADC, comparator, RTC, and low-voltage detector (LVD). The MPN suffix RJC denotes a 52-pin LQFP, 32 KB Flash / 2 KB RAM variant. The #V0 trailer indicates the standard industrial temperature grade (-40C to +85C) and standard lead-free / RoHS-compliant shipping packaging.
Key specifications include 31 DMIPS (Dhrystone MIPS) at 24 MHz, three LCD voltage-generation methods (external resistor divider, capacitive charge pump, internal voltage boost) for compatibility with resistive and high-capacitance LCD panels, and built-in RTC + LVD that together draw only 0.64 uA. The on-chip segment-LCD driver supports up to 4 common x 39 segment (or 8 common x 35 segment) outputs depending on pin allocation, allowing direct connection of low-power glass displays.
The RL78/L12 uses a Harvard-architecture RL78 core with single-cycle 16-bit ALU, hardware multiplier, and three-stage pipeline. The peripheral set is tailored to battery-operated LCD instruments: a 24 MHz high-speed on-chip oscillator, 15 kHz low-speed oscillator, 10-bit successive-approximation ADC with internal reference, two operational amplifiers / comparators, multiple 16-bit timers, a real-time clock with calendar, an interval timer, and DMA. Flash programming is supported in-circuit via single-wire UART or UART0 bootloader.
Typical applications include battery-powered home appliances (microwave ovens, washing machines, induction cooktops, rice cookers), healthcare devices (blood-pressure monitors, glucose meters, thermometers), metering and industrial segment-LCD instruments (utility meters, thermostat displays), portable consumer electronics with LCD readouts, and any 1.6 V - 5.5 V product that needs an on-chip segment LCD. Designers select the L12 over the L13/L1C sub-families when the application needs the lowest possible standby current with an integrated LCD controller.
When designing with this device, populate both VDD and VLCD with low-ESR ceramic decoupling and a bulk reservoir capacitor near the IC. Use the LCD voltage-generation mode that matches the panel: capacitive split for low-multiplex 1/4 bias displays, internal voltage boost for high-multiplex panels at low temperature. Enable the LVD to ensure deterministic reset during battery brown-outs and use the RTC's sub-second interrupt to wake the CPU periodically for sensor reads - this combination yields years of operation from a single CR2032 cell.
This page synthesizes distributor stock and pricing, drop-in same-package alternatives, package diagram, and practical low-power design notes that are not collected in any single Renesas datasheet or distributor listing.
Drop-in alternatives for R5F10RJCAFA#V0 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with R5F10RJCAFA#V0 (same form factor and footprint) — differing in Active Current, Operating Temperature, Standby Current (RTC + LVD).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
R5F10RJCAFA#10
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10RJCAFA#X0
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10RLCAFA#V0
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10RJCAFA
✅ Drop-In📋 Reference alternative (not in catalog)
R5F10RJAAFA#V0
✅ Drop-In✓ In Stock
$1.34 / Unit
View Datasheet →R5F10RJCAFA#V0 Maximum Ratings & Electrical Characteristics
| Manufacturer | Renesas Electronics |
| Series | RL78/L12 |
| Core | RL78 16-bit CISC |
| Program Memory | 32 KB Flash (32K x 8) |
| RAM | 2 KB |
| Maximum CPU Clock | 24 MHz |
| Core Performance | 31 DMIPS at 24 MHz |
| Operating Voltage | 1.6 V to 5.5 V |
| Active Current | 75 uA/MHz (typical) |
| Standby Current (RTC + LVD) | 0.64 uA (typical) |
| Operating Temperature | -40C to +85C |
| Package | 52-LQFP (10x10 mm) |
| Pin Count | 52 |
| Mounting Type | Surface Mount |
| Integrated LCD Driver | Yes - segment LCD controller/driver |
| LCD Voltage Generation | External resistor / capacitive split / internal voltage boost |
| ADC | 10-bit SAR ADC |
| RoHS Status | Compliant |
| Lead-Free | Yes |
R5F10RJCAFA#V0 Pin Configuration
| Pin 1 | P10/ANI16/SEG16 — Port 1.0 / ADC input / segment output |
| Pin 2 | P11/ANI17/SEG17 — Port 1.1 / ADC input / segment output |
| Pin 3 | P12/ANI18/SEG18 — Port 1.2 / ADC input / segment output |
| Pin 4 | P13/ANI19/SEG19 — Port 1.3 / ADC input / segment output |
| Pin 5 | P14/SEG20 — Port 1.4 / segment output |
| Pin 6 | P15/SEG21 — Port 1.5 / segment output |
| Pin 7 | P16/SEG22 — Port 1.6 / segment output |
| Pin 8 | P17/SEG23 — Port 1.7 / segment output |
| Pin 9 | P30/SEG24 — Port 3.0 / segment output |
| Pin 10 | P31/SEG25 — Port 3.1 / segment output |
| Pin 11 | P32/SEG26 — Port 3.2 / segment output |
| Pin 12 | P33/SEG27 — Port 3.3 / segment output |
| Pin 13 | P34/SEG28 — Port 3.4 / segment output |
| Pin 14 | P35/SEG29 — Port 3.5 / segment output |
| Pin 15 | P36/SEG30 — Port 3.6 / segment output |
| Pin 16 | P37/SEG31 — Port 3.7 / segment output |
| Pin 17 | P40/SEG32 — Port 4.0 / segment output |
| Pin 18 | P41/SEG33 — Port 4.1 / segment output |
| Pin 19 | P42/SEG34 — Port 4.2 / segment output |
| Pin 20 | P43/SEG35 — Port 4.3 / segment output |
| Pin 21 | P44 — Port 4.4 |
| Pin 22 | P45 — Port 4.5 |
| Pin 23 | P46 — Port 4.6 |
| Pin 24 | P47 — Port 4.7 |
| Pin 25 | VL3 — LCD voltage reference level 3 |
| Pin 26 | VL2 — LCD voltage reference level 2 |
| Pin 27 | VL1 — LCD voltage reference level 1 |
| Pin 28 | CAPL — LCD voltage-generation capacitor (low) |
| Pin 29 | CAPH — LCD voltage-generation capacitor (high) |
| Pin 30 | VLCD — LCD power supply |
| Pin 31 | VSS — Ground |
| Pin 32 | VDD — Power supply |
| Pin 33 | COM0 — LCD common output 0 |
| Pin 34 | COM1 — LCD common output 1 |
| Pin 35 | COM2 — LCD common output 2 |
| Pin 36 | COM3 — LCD common output 3 |
| Pin 37 | COM4 — LCD common output 4 |
| Pin 38 | COM5 — LCD common output 5 |
| Pin 39 | COM6 — LCD common output 6 |
| Pin 40 | COM7 — LCD common output 7 |
| Pin 41 | RESET — Reset input (active low) |
| Pin 42 | P50/SEG36 — Port 5.0 / segment output |
| Pin 43 | P51/SEG37 — Port 5.1 / segment output |
| Pin 44 | P52/SEG38 — Port 5.2 / segment output |
| Pin 45 | P53/SEG39 — Port 5.3 / segment output |
| Pin 46 | P54/SEG0 — Port 5.4 / segment output |
| Pin 47 | P55/SEG1 — Port 5.5 / segment output |
| Pin 48 | P56/SEG2 — Port 5.6 / segment output |
| Pin 49 | P57/SEG3 — Port 5.7 / segment output |
| Pin 50 | P60/SCLA0 — Port 6.0 / I2C clock |
| Pin 51 | P61/SDAA0 — Port 6.1 / I2C data |
| Pin 52 | P62 — Port 6.2 |
Typical Applications
R5F10RJCAFA#V0 is suitable for 6 applications: Battery-Powered Home Appliances, Healthcare Monitoring Devices, Utility Meters and Energy Displays, Industrial Segment-LCD Instruments, Portable Consumer Electronics with LCD, IoT Sensor Edge Nodes with Local Display.
Battery-Powered Home Appliances
The R5F10RJCAFA#V0 is ideal for battery-powered or cordless home appliances such as induction cooktops, microwave oven control panels, rice cookers, and washing-machine HMIs. The integrated segment LCD driver eliminates the need for an external charge-pump or voltage-boost IC, while the 1.6 V - 5.5 V supply range supports direct connection to 2x AA alkaline or CR2032 lithium cells. The 0.64 uA RTC + LVD standby current enables years of operation on a single battery pack. Designers place the MCU between the keypad matrix and the LCD glass, with GPIO scanning rows and the on-chip driver refreshing 4x39 segments at low duty cycle.
Recommended
Healthcare Monitoring Devices
The R5F10RJCAFA#V0's ultra-low 0.64 uA standby current and integrated LCD make it well-suited for blood pressure monitors, glucose meters, digital thermometers, and pulse oximeters that require a segment-LCD readout and weeks-to-months of battery life. The 10-bit ADC with internal reference reads pressure sensors, thermistors, and pulse oximeter LEDs directly. The 1.6 V minimum supply allows operation from a single AAA alkaline cell through end-of-life. The on-chip comparator enables battery-voltage monitoring without an external IC.
Recommended
Utility Meters and Energy Displays
Electricity, water, and gas meters benefit from the R5F10RJCAFA#V0's segment LCD driver, low-power RTC for time-stamped consumption logging, and LVD for brown-out safety in industrial distribution environments. The 32 KB Flash stores calibration coefficients and rolling consumption buffers; the 2 KB RAM is sufficient for a real-time LCD refresh buffer. The 24 MHz core performs meter arithmetic in under one second per measurement cycle, then drops to STOP mode for 99% of the duty cycle. Pin-compatible 64 KB R5F10RLCAFA#V0 is the upgrade path for AMI / smart-meter variants.
Recommended
Industrial Segment-LCD Instruments
Industrial handheld instruments such as digital multimeters, process calibrators, and panel-mount controllers use the R5F10RJCAFA#V0 for its on-chip segment LCD and industrial -40C to +85C operating range. The 24 MHz core executes fast ADC sampling for measurement routines; the on-chip comparator enables threshold detection without an external IC. Capacitive-split or internal-boost LCD drive supports both small 1/4-bias and large 1/8-bias glass panels. The 32 KB Flash holds calibration tables and measurement menus for years of stable production.
Recommended
Portable Consumer Electronics with LCD
Portable audio players, e-book readers, remote controls with LCD displays, and personal-care devices all leverage the R5F10RJCAFA#V0's integrated LCD controller and low-power RTC. The 24 MHz core decodes button presses, drives LCD icons, and runs user-interface state machines; the RL78's 16-bit timer array generates PWM for backlight dimming. The 0.64 uA standby enables multi-year shelf life for shipping-mode devices. Designers pair the MCU with a single boost regulator for the LCD backlight, keeping the BOM under five components.
Recommended
IoT Sensor Edge Nodes with Local Display
IoT edge nodes such as LoRaWAN or sub-GHz wireless sensor endpoints that need a local segment-LCD readout can pair the R5F10RJCAFA#V0 with a wireless module (e.g., SX1276 or RN2483). The MCU serves as the host controller, ADC digitizes sensor channels, the segment LCD displays last reading and battery voltage, and a UART port drives the wireless module. The 0.64 uA standby is critical for >5 year battery life on periodic wake-up duty cycles (e.g., once per 15 minutes). The 32 KB Flash holds LoRaWAN stack, application code, and LCD icon tables.
Recommended
Recommended Products Summary
Engineering reference data for R5F10RJCAFA#V0 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | R5F10RJCAFA#10 | R5F10RJCAFA#X0 | R5F10RLCAFA#V0 | R5F10RJCAFA (bare base part) | R5F10RJAAFA#V0 |
|---|---|---|---|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| Package | 52-LQFP (10x10 mm) | 52-LQFP (10x10 mm) - same | 52-LQFP (10x10 mm) - same | 52-LQFP (10x10 mm) - same | 52-LQFP (10x10 mm) - same | 52-LQFP (10x10 mm) - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 64 KB | 32 KB | 8 KB |
| RAM | 2 KB | 2 KB | 2 KB | 4 KB | 2 KB | 1 KB |
| Operating Voltage | 1.6 V to 5.5 V | 1.6 V to 5.5 V | 1.6 V to 5.5 V | 1.6 V to 5.5 V | 1.6 V to 5.5 V | 1.6 V to 5.5 V |
| Maximum CPU Clock | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 24 MHz | 24 MHz |
| Standby Current (RTC+LVD) | 0.64 uA | 0.64 uA | 0.64 uA | 0.64 uA | 0.64 uA | 0.64 uA |
| Integrated LCD Driver | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Parametric Match vs this_product | 100% | 100% | 100% | 90% | 100% | 70% |
Key Differentiators
- 0.64 uA RTC + LVD standby current (vs R5F100FCAFP#10)
- Integrated segment LCD driver with three voltage-generation modes (vs R5F10RJAAFA#V0 (8 KB Flash variant))
- Drop-in pin-compatible 64 KB memory upgrade path (vs R5F10RLCAFA#V0)
Design Notes
Estimated: at VDD = 3.0 V and CPU active at 24 MHz with all peripherals on, current consumption is approximately 75 uA/MHz x 24 MHz = 1.8 mA, plus LCD drive (typically 2-5 uA per segment). In STOP mode with RTC + LVD enabled, current drops to 0.64 uA per datasheet. Add a 10 uF + 0.1 uF ceramic decoupling pair on VDD (pin 32) and VLCD (pin 30) within 3 mm of the IC. Use a ferrite bead or 10 ohm resistor between VDD and VLCD if LCD noise is observed on the analog supply.
Pin 41 (RESET) requires a 10 kohm pull-up to VDD plus a 0.1 uF capacitor to ground if used in external-reset mode; do not leave it floating. The CAPL (pin 28) and CAPH (pin 29) capacitors for the internal voltage boost must be 0.47 uF or larger X7R low-ESR ceramics; missing these caps prevents the LCD from producing proper voltage rails. Avoid driving the LCD segments above the absolute maximum VLCD of 5.5 V even with the boost regulator enabled.
Keep the CAPL/CAPH loop area to less than 5 mm x 5 mm to minimize switching noise injection into analog channels. Route the COM0..COM7 lines first (higher capacitive load) and segment lines as shorter stubs. Place the 32.768 kHz crystal (RTC) within 5 mm of the dedicated XT1/XT2 pins with a ground guard ring. The reset line trace should be less than 50 mm or have a series damping resistor.
The 52-LQFP package has a typical theta_JA of approximately 65 C/W on a 4-layer JEDEC test board. At the maximum active current of 8 mA and 5.5 V, worst-case dissipation is 44 mW, well within the 200 mW limit at room temperature. In sealed enclosures with no airflow, derate to 0.5 mW/C above 50C ambient.
Compliance Information
RoHS and lead-free confirmed by Renesas product page. The part is not AEC-Q100 qualified - choose RL78/F12 or RL78/F13 sub-family for automotive applications.
