Renesas R7F123FBG4ANP-C#BA0

Overview

R7F123FBG4ANP-C#BA0 from Renesas Electronics is a 16-bit RL78/F23 microcontroller in a 32-pin QFP package, featuring 64 KB flash memory, 4 KB RAM, and integrated 10-bit ADC with 12 channels. It operates at up to 24 MHz, supports on-chip debug, and targets low-power industrial control and sensor interface applications.

For engineers reviewing the R7F123FBG4ANP-C#BA0 datasheet, R7F123FBG4ANP-C#BA0 pinout, R7F123FBG4ANP-C#BA0 application, or R7F123FBG4ANP-C#BA0 equivalent, key selection criteria include its 32-pin LQFP-32 (7×7 mm) footprint, 1.8–5.5 V supply range, built-in LIN bus support, and hardware real-time clock (RTC) with calendar function.

Technical Context

The R7F123FBG4ANP-C#BA0 implements the RL78 CPU core with 16-bit CISC architecture, 3-stage pipeline, and 1.62 DMIPS/MHz performance. It integrates a 10-bit ADC with sample-and-hold, 8-bit D/A converter, and 16-bit timer arrays (TMR00–TMR03) supporting input capture, output compare, and PWM generation.

On-chip peripherals include a 3-channel serial array unit (SAU) configurable as UART, CSI, or I²C; a 1-channel LIN controller compliant with ISO 17987-4; and a 32-bit watchdog timer with window function. Power management features include HALT, STOP, and ultra-low-power SNOOZE modes with current as low as 0.52 µA in STOP mode.

Key Specifications

Pinout & Package

Package: 32-pin LQFP (7 mm × 7 mm, 0.8 mm pitch), RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with R7F123FBG4ANP-C#BA0, the R7F123FGG4ANP-C#BA0 offers expanded I/O and analog resources at the cost of larger footprint, while the R7F124FBJ4ANP-C#AA0 delivers identical form factor plus CAN capability-making it ideal for automotive body electronics upgrades without PCB revision.

Availability

R7F123FBG4ANP-C#BA0 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC actuators, programmable logic relays, energy meter front-ends, and LIN-based automotive subsystems requiring stable component supply and long-term manufacturability.

Supply support for R7F123FBG4ANP-C#BA0 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 Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and SoC solutions for industrial, automotive, and IoT markets.

The RL78/F23 product line delivers ultra-low-power 16-bit MCUs optimized for cost-sensitive, battery-operated, and LIN-focused embedded control applications - emphasizing energy efficiency, integration, and ease of certification.

FAQ

What is the maximum operating frequency of the R7F123FBG4ANP-C#BA0?

The R7F123FBG4ANP-C#BA0 supports a maximum CPU operating frequency of 24 MHz. This can be achieved using the internal high-speed oscillator (15 MHz or 24 MHz selectable) or an external crystal/resonator up to 20 MHz with PLL multiplication. The device maintains full functionality-including ADC, timers, and LIN-at this speed, and all electrical specifications in the datasheet are validated at 24 MHz operation.

Does the R7F123FBG4ANP-C#BA0 include a hardware real-time clock (RTC)?

Yes, the R7F123FBG4ANP-C#BA0 integrates a dedicated 32-bit hardware RTC with calendar function (year/month/day/hour/minute/second). It operates independently in STOP mode using the on-chip sub-clock oscillator (32.768 kHz), retaining time and date with typical accuracy of ±1.5 ppm over 0–70°C. The RTC registers are accessible via dedicated SFRs and require no software overhead during timekeeping.

Is the R7F123FBG4ANP-C#BA0 pin-compatible with other RL78/F23 variants?

No - the R7F123FBG4ANP-C#BA0 is specifically a 32-pin LQFP variant. While other RL78/F23 devices like R7F123FLG (64-pin) or R7F123FMG (80-pin) share the same core and peripheral set, they differ in pin count, package size, and I/O mapping. Only devices sharing the "FBG" suffix (e.g., R7F123FBG2ANP-C#BA0) are pin-compatible, differing only in flash size or temperature grade.

What debug interface does the R7F123FBG4ANP-C#BA0 support?

The R7F123FBG4ANP-C#BA0 supports Renesas' Single-Wire Debug (SWD) interface via the RES# pin, enabling full-featured on-chip debugging including breakpoints, watchpoints, memory inspection, and real-time trace. No additional pins are required - SWD uses the existing RESET pin for bidirectional communication. Debugging is supported by E2 Lite and E2 emulators, and integrated into CS+ and e2 studio IDEs.

Can the R7F123FBG4ANP-C#BA0 operate from a 1.8 V supply?

Yes, the R7F123FBG4ANP-C#BA0 is fully specified to operate across a supply voltage range of 1.8 V to 5.5 V. At 1.8 V, it supports up to 8 MHz CPU frequency and retains access to all core peripherals (ADC, timers, SAU, LIN), though some analog performance specs (e.g., ADC INL) are characterized separately at low voltage. This wide VDD range simplifies design in mixed-voltage systems and enables direct connection to Li-ion battery or energy-harvesting sources.