Renesas R5F21388SNFP#30

Overview

R5F21388SNFP#30 from Renesas 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 operates at up to 20 MHz (VCC = 2.7–5.5 V), integrates a 36-channel capacitive touch sensor control unit (TSCU), 10-bit A/D converter (20 channels), hardware LIN module, and dual UART + I²C/SSU serial interfaces. It targets embedded control in consumer appliances requiring low EMI, touch UI, and mixed-signal timing precision.

For engineers reviewing the R5F21388SNFP#30 datasheet, R5F21388SNFP#30 pinout, R5F21388SNFP#30 application, or R5F21388SNFP#30 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases for touch-enabled appliances, and two confirmed alternative MCUs with documented functional alignment and key trade-offs in memory, temperature grade, and peripheral coverage.

Technical Context

The R5F21388SNFP#30 implements the R8C CPU core with 89 fundamental instructions, 16×16→32-bit multiplier, and multiply-accumulate capability. Its 1 Mbyte address space supports single-chip mode execution, with interrupt priority levels (0–7), 69 interrupt vectors, and event link controller (ELC) enabling direct peripheral-to-peripheral event chaining without CPU intervention.

It features four independent clock sources: XIN/XOUT crystal oscillator, XCIN/XCOUT low-power crystal input, high-speed on-chip oscillator (adjustable), and low-speed on-chip oscillator (for watchdog and stop-mode operation). Power management includes wait mode (4.0 µA @ 3.0 V, 32 kHz) and stop mode (2.2 µA), with voltage detection at three configurable thresholds and power-on reset.

Key Specifications

Pinout & Package

Package: 80-pin LQFP (PLQP0080KB-A), 0.5 mm pitch, 12 × 12 mm square body, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with R5F21388SDFP, the R5F21388SNFP#30 offers lower cost and sufficient temperature margin for consumer white goods; compared with R5F2138CSNFP, it trades memory headroom for optimized BOM cost in fixed-function appliances.

Availability

R5F21388SNFP#30 is available at Aetrix Electronics and suitable for electronic household appliances, office equipment, and audio equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for R5F21388SNFP#30 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 solutions for automotive, industrial, and IoT markets.

The R8C/38T-A Group, including R5F21388SNFP#30, was designed for cost-sensitive, touch-enabled consumer electronics requiring integrated analog peripherals, low EMI, and robust real-time control.

FAQ

What is the maximum CPU clock frequency supported by the R5F21388SNFP#30?

The R5F21388SNFP#30 supports a maximum CPU clock frequency of 20 MHz when operating within the 2.7 V to 5.5 V supply range. At lower 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 in battery-powered or wide-input-voltage designs.

Does the R5F21388SNFP#30 include hardware support for LIN communication?

Yes, the R5F21388SNFP#30 integrates a dedicated hardware LIN module (HW-LIN_0) compliant with LIN 2.1/2.2 standards. It uses UART0_0, UART0_1, or UART2 under timer RJ_0 control to implement physical layer signaling, reducing CPU load and improving protocol timing accuracy versus software-based implementations.

How many analog input channels does the R5F21388SNFP#30's A/D converter support?

The R5F21388SNFP#30 features a 10-bit A/D converter with 20 analog input channels (AN0 through AN19). These channels are multiplexed with general-purpose I/O and touch sensor pins, allowing shared pin usage while maintaining simultaneous sampling capability via sweep mode configuration.

What is the purpose of the background operation (BGO) function in the R5F21388SNFP#30's data flash?

The background operation (BGO) function allows the R5F21388SNFP#30 to execute program code from flash memory while simultaneously erasing or writing to data flash blocks. This enables seamless firmware updates, parameter storage, or calibration data logging without halting real-time tasks - critical for uninterrupted appliance control.

Is the R5F21388SNFP#30 pin-compatible with other devices in the R8C/38T-A Group?

Yes, all members of the R8C/38T-A Group, including R5F21388SNFP#30, R5F21388SDFP, and R5F2138CSNFP, share identical 80-pin LQFP (PLQP0080KB-A) packaging and pin assignments. This enables direct PCB reuse across variants differing only in memory size, temperature grade, or ROM capacity - simplifying platform scalability.