Renesas R5F21388SNFP#V0

Overview

R5F21388SNFP from Renesas Electronics is a 16-bit R8C CPU core microcontroller with 64 KB flash program ROM, 6 KB RAM, and 4 KB data flash (1 KB × 4 blocks) supporting background operation (BGO). It delivers 20 MHz CPU clock at 2.7–5.5 V, integrates a 10-bit 20-channel A/D converter, hardware LIN module, and electrostatic capacitive touch sensor control unit (TSCU) for 36 channels - used in appliance control panels and consumer HMI systems.

For engineers reviewing the R5F21388SNFP datasheet, R5F21388SNFP pinout, R5F21388SNFP application, or R5F21388SNFP equivalent, key selection criteria include its 80-pin LQFP package, -20°C to +85°C operating range (N version), integrated TSCU for self-capacitance sensing, dual UART + I²C + SSU serial interfaces, and on-chip voltage detection with three configurable thresholds.

Technical Context

The R5F21388SNFP implements the R8C CPU core with 89 fundamental instructions and a 16×16→32-bit hardware multiplier, enabling efficient signal processing in resource-constrained embedded applications. Its memory map spans 1 Mbyte (00000h–FFFFFh), with program ROM allocated across low- and high-address regions and data flash fixed at 07000h–07FFFh.

Peripheral integration includes Timer RJ (16-bit), Timer RB2 (16-bit PWM), Timer RC (16-bit with 4 capture/compare registers), and Timer RE2 (8-bit RTC), all accessible via dedicated I/O pins with configurable alternate functions. The event link controller (ELC) supports 30 sources × 10 operation types for autonomous peripheral coordination without CPU intervention.

Key Specifications

Pinout & Package

80-pin LQFP package (PLQP0080KB-A), 0.5 mm pitch, 12 × 12 mm square body, with exposed thermal pad (not electrically connected). Pin assignments follow JEDEC MS-026 standard layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21388SDFP and R5F2138ASNFP, the R5F21388SNFP offers optimal cost/performance balance for commercial-grade appliances and audio devices operating within -20°C to +85°C, with sufficient memory headroom and full peripheral compatibility.

Availability

R5F21388SNFP is available at Aetrix Electronics and suitable for appliance control panels, consumer audio systems, and office equipment requiring stable component supply and long-term production continuity.

Supply support for R5F21388SNFP 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 global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and IoT markets.

The R8C/38T-A Group, including the R5F21388SNFP, was designed for cost-sensitive, low-power embedded control applications requiring integrated touch sensing, serial connectivity, and robust real-time performance in consumer and white goods.

FAQ

What is the maximum CPU clock frequency supported by the R5F21388SNFP?

The R5F21388SNFP supports a maximum CPU clock frequency of 20 MHz when operated at VCC = 2.7 V to 5.5 V. At lower supply voltages (1.8 V to 5.5 V), the maximum clock is reduced to 5 MHz to ensure stable operation. This dual-frequency capability allows flexible power/performance trade-offs across battery and line-powered designs.

Does the R5F21388SNFP include hardware support for LIN communication?

Yes, the R5F21388SNFP includes a dedicated hardware LIN module (HW-LIN_0) compliant with LIN 2.1 and SAE J2602 standards. It leverages UART0_0 or UART0_1 for serial framing and Timer RJ_0 for precise bit timing, enabling reliable slave-node operation without software bit-banging overhead.

How many touch sensing channels does the R5F21388SNFP support, and what type of sensing is implemented?

The R5F21388SNFP supports 36 electrostatic capacitive touch sensing channels via its integrated Touch Sensor Control Unit (TSCU). It implements self-capacitance measurement using charge-transfer techniques, allowing direct connection of PCB copper pads as electrodes without external components or calibration ICs.

What is the purpose of the Background Operation (BGO) function in the R5F21388SNFP's data flash?

The Background Operation (BGO) function in the R5F21388SNFP allows the CPU to execute code from program ROM while simultaneously erasing or programming data flash blocks. This enables non-disruptive firmware updates, parameter storage during runtime, and real-time logging - critical for fail-safe and always-on embedded systems.

What are the key differences between the R5F21388SNFP and R5F21388SDFP variants?

The R5F21388SNFP and R5F21388SDFP share identical functionality, pinout, and electrical specifications. The only difference is the operating ambient temperature range: R5F21388SNFP is rated for -20°C to +85°C (N version), while R5F21388SDFP extends to -40°C to +85°C (D version) for harsher industrial or automotive environments.